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WO2018038079A1 - Antenna device - Google Patents

Antenna device Download PDF

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Publication number
WO2018038079A1
WO2018038079A1 PCT/JP2017/029866 JP2017029866W WO2018038079A1 WO 2018038079 A1 WO2018038079 A1 WO 2018038079A1 JP 2017029866 W JP2017029866 W JP 2017029866W WO 2018038079 A1 WO2018038079 A1 WO 2018038079A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
antenna device
electrode portion
parasitic element
substrate
Prior art date
Application number
PCT/JP2017/029866
Other languages
French (fr)
Japanese (ja)
Inventor
泰夫 田保
Original Assignee
株式会社村田製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Priority to JP2018535681A priority Critical patent/JP6642722B2/en
Publication of WO2018038079A1 publication Critical patent/WO2018038079A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/44—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the electric or magnetic characteristics of reflecting, refracting, or diffracting devices associated with the radiating element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Definitions

  • the present invention relates to a small antenna device housed in a small electronic device such as a mobile communication terminal.
  • Patent Document 1 describes an antenna device using a monopole antenna and a parasitic element.
  • the monopole antenna and the parasitic element are L-shaped linear conductors, both of which have a long portion extending in the width direction of the casing of the mobile communication terminal, and the vertical length of the casing. A portion extending in a direction (a direction orthogonal to the width direction and the thickness direction) is short.
  • the end of the part extending in the vertical direction in the monopole antenna is a feeding point.
  • the end portion of the parasitic element extending in the vertical direction is connected to the ground.
  • the end of the monopole antenna that extends in the width direction of the casing (the open end of the monopole antenna) and the end of the parasitic element that extends in the width direction of the casing (the open end of the parasitic element) Capacitively coupled.
  • Patent Document 1 a portion extending in the width direction of the housing in the monopole antenna and a portion extending in the width direction of the housing in the parasitic element having substantially the same length are arranged in the width direction of the housing. Must be spaced apart.
  • the length in the width direction for realizing the omnidirectional antenna is required to some extent, and the downsizing of the casing is hindered.
  • an object of the present invention is to provide a small omnidirectional antenna.
  • the antenna device of the present invention includes a substrate, a ground electrode, a feeding element, and a parasitic element.
  • the length of the substrate in the first direction is approximately 1 ⁇ 4 or less of the wavelength of the high-frequency signal to be transmitted and received.
  • the ground electrode is formed on the surface of the substrate.
  • the power feeding element is formed in a portion where the ground electrode is not formed on the surface of the substrate, and is connected to a power feeding point.
  • the parasitic element is disposed at a distance from the surface in a second direction orthogonal to the surface of the substrate, and is capacitively coupled to the feeder element.
  • the parasitic element includes a first electrode part, a second electrode part, and a third electrode part.
  • the first electrode portion has a shape extending in the first direction.
  • the second electrode portion is connected to the first end in the first direction of the first electrode portion and has a shape extending in the second direction.
  • the third electrode portion is connected to the second end in the first direction of the first electrode portion and has
  • a current parallel to the first direction flows through the parasitic element.
  • a current parallel to the third direction perpendicular to the first direction (lateral direction of the substrate) and the second direction (direction orthogonal to the surface of the substrate) flows through the substrate. Therefore, the directivity of the antenna in a plane including the first direction and the third direction approaches omnidirectionality.
  • the width of the first electrode portion is larger than the width of the second electrode portion and the width of the third electrode.
  • the slit formed of the connection portion between the first electrode portion and the second electrode portion and the electrode non-formation portion provided at the connection portion between the first electrode portion and the third electrode portion is provided. It is preferable to provide.
  • the slit has a shape that bends in the middle of the extending direction.
  • the second electrode portion and the third electrode portion may have a meander shape.
  • the electrical length of the second electrode portion and the third electrode portion can be increased without increasing the length of the second electrode portion and the third electrode portion in the third direction (vertical direction of the substrate). Therefore, the parasitic element becomes small.
  • the antenna device of the present invention may have the following configuration.
  • the 2nd electrode part and the 3rd electrode part have an electrode non-formation part in the middle position of the extending direction.
  • the electrodes separated by the electrode non-forming portion are connected by a mounting type inductor.
  • the parasitic element may have a bent portion that bends toward the substrate.
  • the length between the connection portion to the second electrode portion and the connection portion to the third electrode portion in the first electrode portion is approximately 1/10 to the wavelength of the high-frequency signal. It is preferable that it is 1/4.
  • an omnidirectional antenna can be realized in a small size.
  • FIG. 1 is an external perspective view of an antenna device according to a first embodiment of the present invention.
  • 1 is a plan view of an antenna device according to a first embodiment of the present invention.
  • (A), (B), (C), (D) is a figure explaining the change of directivity according to the shape of a parasitic element. It is a figure which shows a shape and directivity characteristic when the width
  • (A), (B), (C) is an external perspective view of a parasitic element of an antenna device according to a seventh embodiment of the present invention.
  • (A) is a top view of the parasitic element of the antenna apparatus which concerns on the 8th Embodiment of this invention
  • (B) is a top view of the parasitic element of the antenna apparatus of a comparison object.
  • (A)-(E) is a figure which shows the example of a shape of the electric power feeding element which concerns on embodiment of this invention.
  • FIG. 1 is an external perspective view of the antenna device according to the first embodiment of the present invention.
  • FIG. 2 is a plan view of the antenna device according to the first embodiment of the present invention.
  • the antenna device 10 includes a feeding element 20, a ground electrode 30, a parasitic element 40, and a substrate 300.
  • the antenna device 10 is disposed in a housing 90 such as a portable communication device.
  • the substrate 300 is made of an insulating base material, and the length in the y direction (first direction) is shorter than the length in the z direction (third direction).
  • the length of the substrate 300 in the y direction is approximately 1 ⁇ 4 or less of the wavelength of the high frequency signal to be transmitted and received by the antenna device 10.
  • the y direction (first direction) is the lateral direction of the substrate 300
  • the z direction (third direction) is the longitudinal direction of the substrate 300.
  • a thickness direction of the substrate 300, that is, a direction orthogonal to the surface of the substrate 300 is defined as an x direction (second direction).
  • the ground electrode 30 and the power feeding element 20 are formed on the surface of the substrate 300.
  • the ground electrode 30 and the power feeding element 20 are made of, for example, copper (Cu).
  • the ground electrode 30 is formed on substantially the entire surface except for a portion of a predetermined length on one end side in the z direction of the substrate 300.
  • the feeding element 20 is formed in a region where the ground electrode 30 is not formed on the substrate 300.
  • the power feeding element 20 is a linear electrode.
  • the power supply element 20 is formed by connecting a power supply end side electrode 21 extending in the z direction and an open end side electrode 22 extending in the y direction. Therefore, the power feeding element 20 is an L-shaped linear electrode that bends in the middle of the extending direction.
  • the length of the power feeding element 20 is approximately 1 ⁇ 4 of the wavelength of the high-frequency signal, and the length of the open end side electrode 22 is preferably closer to the length of the power feeding element 20.
  • the end of the power supply end electrode 21 opposite to the open end side electrode 22 is close to the ground electrode 30.
  • a proximity point between the feeding end side electrode 21 and the ground electrode 30 is a feeding point FP of the feeding element 20.
  • the feeding point FP is disposed near one end of the substrate 300 in the y direction.
  • the end of the open end side electrode 22 opposite to the power feed end side electrode 21, that is, the open end of the feed element 20 is disposed near the other end of the substrate 300 in the y direction.
  • the length in the y direction of the substrate 300 (the length in the lateral direction of the substrate 300) can be set to a minimum length necessary for transmitting and receiving a high-frequency signal.
  • the parasitic element 40 is arranged away from the surface of the substrate 300 in the x direction.
  • the parasitic element 40 is disposed at a position where the parasitic element 40 is capacitively coupled to the feeder element 20. Specifically, as shown in FIG. 2, the parasitic element 40 overlaps at least a part of the feeding element 20 in a plan view including a plane including the y direction and the z direction.
  • the parasitic element 40 overlaps a part of the ground electrode 30.
  • the parasitic element 40 is made of copper (Cu) or the like, similar to the feeder element 20.
  • the parasitic element 40 includes a first electrode part 41, a second electrode part 42, and a third electrode part 43.
  • the 1st electrode part 41, the 2nd electrode part 42, and the 3rd electrode part 43 are strip
  • the length of the second electrode portion 42 and the length of the third electrode portion 43 are substantially the same.
  • the first electrode portion 41 has a shape extending in the y direction.
  • the 2nd electrode part 42 and the 3rd electrode part 43 are the shapes extended in az direction.
  • the second electrode portion 42 is connected to one end (first end) in the y direction of the first electrode portion 41.
  • the third electrode portion 43 is connected to the other end (second end) in the y direction of the first electrode portion 41.
  • the second electrode portion 42 and the third electrode portion 43 are disposed on the same side with respect to the first electrode portion 41 in the z direction.
  • the length of the parasitic element 40 that is, the length of the shape connected in the order of the second electrode portion 42, the first electrode portion 41, and the third electrode portion 43 is approximately 1 ⁇ 2 of the wavelength of the high-frequency signal.
  • the antenna device 10 when a high frequency signal is fed to the feeding point FP, the current flowing in the z direction increases according to the shape of the substrate 300, that is, the ground electrode 30, and the current flowing in the y direction. Becomes smaller.
  • the parasitic element 40 since the parasitic element 40 has the above-described configuration, the currents flowing through the second electrode portion 42 and the third electrode portion 43 are canceled in opposite directions. The flowing current, that is, the current flowing in the y direction increases.
  • the directivity of the high-frequency signal radiated by the antenna device 10 is almost non-directional with almost no NULL in all directions in the plane including the y direction and the z direction. Therefore, omnidirectionality can be realized without increasing the shape of the antenna device 10, particularly the shape in the y direction (the width direction of the substrate).
  • FIGS. 3A to 3D are diagrams for explaining the change in directivity according to the shape of the parasitic element.
  • 3A to 3D show changes in directivity when the length of the first electrode portion of the parasitic element is changed.
  • 3 (A) to 3 (D) the shape is shown in the left column toward the paper surface, and the directivity characteristic is shown in the right column toward the paper surface.
  • the lengths of the second electrode portion and the third electrode portion also change in accordance with the change in the length of the first electrode portion, and the length of the parasitic element is approximately 1 ⁇ 2 of the wavelength of the high-frequency signal. Is maintained.
  • the 0 ° direction and the 180 ° direction are the vertical direction (z direction) of the substrate, and the 90 ° direction and the 270 ° direction are the horizontal direction ( y direction).
  • the directivity of the figure 8 that is, the electric field strength in the vertical direction of the substrate 300 is significantly low, and NULL is generated in the 0 ° direction and the 180 ° direction.
  • NULL is generated regardless of the intensity of radiation.
  • the distance between the connection end to the second electrode portion and the connection end to the third electrode portion in the first electrode portion is set between ⁇ / 4 and ⁇ / 10 to be more accurate. And omnidirectionality can be realized reliably.
  • the width of the substrate 300 (the length in the y direction), that is, the width of the ground electrode 30 (the length in the y direction) is preferably approximately ⁇ / 4 or less.
  • FIG. 4 is a diagram showing the shape and directivity characteristics when the width (length in the y direction) of the ground electrode is ⁇ / 2.
  • the width of the ground electrode 30 is preferably approximately ⁇ / 4 or less.
  • the width of the ground electrode 30 (the length in the y direction) may be set as appropriate according to the shape required for the product, and the width of the ground electrode 30 (the length in the y direction) is also taken into account, for example, the radiated power ) May be appropriately set to approximately ⁇ / 4 or less.
  • FIG. 5 is a plan view of a parasitic element of the antenna device according to the second embodiment of the present invention.
  • the solid line indicates the shape of the parasitic element 40 ⁇ / b> A according to the present embodiment
  • the dotted line indicates the shape of the parasitic element 40 according to the first embodiment.
  • the antenna device according to the present embodiment differs from the antenna device 10 according to the first embodiment in the shape of the parasitic element 40A.
  • Other configurations of the antenna device according to the present embodiment are the same as those of the antenna device 10 according to the first embodiment, and the description of the same parts is omitted.
  • the parasitic element 40A includes a first electrode portion 41A, a second electrode portion 42A, and a third electrode portion 43A.
  • the connection mode of the first electrode part 41A, the second electrode part 42A, and the third electrode part 43A is the same as that of the parasitic element 40 according to the first embodiment.
  • the width W41A of the first electrode portion 41A is larger than the width W41 of the first electrode portion 41 according to the first embodiment.
  • the width of the first electrode portions 41 and 41A is the length in the z direction (vertical direction of the substrate).
  • the parasitic element 40A has a larger capacitive coupling to the feeding element than the parasitic element 40 according to the first embodiment. Therefore, when the lengths of the second electrode portion 42A and the third electrode portion 43A are the same as those of the second electrode portion 42 and the third electrode portion 43 according to the first embodiment, the frequency as the antenna device 10 is low. Become. In other words, when the frequency of the antenna device 10 is not changed, as shown in FIG. 5, the lengths of the second electrode portion 42A and the third electrode portion 43A are the second electrode portion 42 and the second electrode portion 42 according to the first embodiment. It can be made smaller than the third electrode portion 43. That is, the size of the parasitic element 40A in the z direction (vertical direction of the substrate) can be reduced.
  • FIG. 6 is a plan view of a parasitic element of the antenna device according to the third embodiment of the present invention.
  • the antenna device according to the present embodiment differs from the antenna device according to the second embodiment in the shape of the parasitic element 40B.
  • Other configurations of the antenna device according to the present embodiment are the same as those of the antenna device according to the second embodiment, and description of the same parts is omitted.
  • the parasitic element 40B includes a first electrode part 41B, a second electrode part 42B, and a third electrode part 43B.
  • the connection mode of the first electrode part 41B, the second electrode part 42B, and the third electrode part 43B is the same as that of the parasitic element 40A according to the second embodiment.
  • a slit 442B is provided at a connection portion between the first electrode portion 41B and the second electrode portion 42B.
  • the slit 442B is realized by providing an electrode non-forming portion extending in the z direction with respect to the first electrode portion 41B.
  • the slit 442B is provided inside the bent shape that connects the first electrode portion 41B to the second electrode portion 42B.
  • a slit 443B is provided at a connection portion between the first electrode portion 41B and the third electrode portion 43B.
  • the slit 443B is realized by providing an electrode non-forming portion extending in the z direction with respect to the first electrode portion 41B.
  • the slit 443B is provided inside the bent shape that connects the first electrode part 41B to the third electrode part 43B.
  • the electrical length of the parasitic element 40B can be increased. Thereby, the length of the parasitic element 40B can be shortened, and the parasitic element 40B can be reduced in size.
  • FIG. 7 is a plan view of a parasitic element of the antenna device according to the fourth embodiment of the present invention.
  • the antenna device according to the present embodiment differs from the antenna device according to the second embodiment in the shape of the parasitic element 40C.
  • Other configurations of the antenna device according to the present embodiment are the same as those of the antenna device according to the second embodiment, and description of the same parts is omitted.
  • the parasitic element 40C includes a first electrode portion 41C, a second electrode portion 42C, and a third electrode portion 43C.
  • the connection mode of the first electrode part 41C, the second electrode part 42C, and the third electrode part 43C is the same as that of the parasitic element 40A according to the second embodiment.
  • a slit 442C is provided at a connection portion between the first electrode portion 41C and the second electrode portion 42C.
  • the slit 442C includes electrode non-forming parts 4421C and 4422C provided for the first electrode part 41C.
  • the electrode non-forming portion 4421C has a shape that opens at the end in the width direction of the first electrode portion 41C and extends in the z direction.
  • the electrode non-forming portion 4422C is continuous with the electrode non-forming portion 4421C and has a shape extending in the y direction.
  • the slit 442C is provided inside the bent shape that connects the first electrode portion 41C to the second electrode portion 42C.
  • a slit 443C is provided at a connection portion between the first electrode portion 41C and the third electrode portion 43C.
  • the slit 443C includes electrode non-formation parts 4431C and 4432C provided for the first electrode part 41C.
  • the electrode non-forming portion 4431C has a shape that opens at the end in the width direction of the first electrode portion 41C and extends in the z direction.
  • the electrode non-forming portion 4432C has a shape that is continuous with the electrode non-forming portion 4431C and extends in the y direction.
  • the slit 443C is provided inside the bent shape that connects the first electrode portion 41C to the third electrode portion 43C.
  • the electrical length of the parasitic element 40B can be increased.
  • the electrical length can be made longer than that of the parasitic element 40A according to the third embodiment.
  • the length of the parasitic element 40C can be further shortened, and the parasitic element 40C can be further reduced in size.
  • FIG. 8 is a plan view of a parasitic element of the antenna device according to the fifth embodiment of the present invention.
  • the antenna device according to the present embodiment differs from the antenna device according to the second embodiment in the shape of the parasitic element 40D.
  • Other configurations of the antenna device according to the present embodiment are the same as those of the antenna device according to the second embodiment, and description of the same parts is omitted.
  • the parasitic element 40D includes a first electrode part 41D, a second electrode part 42D, and a third electrode part 43D.
  • the connection mode of the first electrode portion 41D, the second electrode portion 42D, and the third electrode portion 43D is the same as that of the parasitic element 40A according to the second embodiment.
  • the shape of the first electrode portion 41D is the same as that of the first electrode portion 41A according to the second embodiment.
  • the second electrode part 42D and the third electrode part 43D have a meander shape. At this time, it is preferable that the second electrode portion 42D and the third electrode portion 43D have a line-symmetric shape with respect to a reference line that passes through the center in the y direction of the first electrode portion 41D and extends in the z direction.
  • the parasitic element 40D can have a predetermined electrical length while shortening the lengths of the second electrode portion 42D and the third electrode portion 43D in the z direction. Thereby, parasitic element 40D can be reduced in size.
  • FIG. 9 is a plan view of a parasitic element of the antenna device according to the sixth embodiment of the present invention.
  • the antenna device according to the present embodiment differs from the antenna device according to the second embodiment in the shape of the parasitic element 40E.
  • Other configurations of the antenna device according to the present embodiment are the same as those of the antenna device according to the second embodiment, and description of the same parts is omitted.
  • the parasitic element 40E includes a first electrode part 41E, a second electrode part 42E, and a third electrode part 43E.
  • the connection mode of the first electrode part 41E, the second electrode part 42E, and the third electrode part 43E is the same as that of the parasitic element 40A according to the second embodiment.
  • the shape of the first electrode part 41E is the same as that of the first electrode part 41E according to the second embodiment.
  • the second electrode portion 42E has an electrode non-forming portion 420 at a midpoint in the extending direction (z direction).
  • the two electrode portions separated by the electrode non-forming portion 420 in the second electrode portion 42E are connected by a mounting inductor 452.
  • the inductance of the mounted inductor 452 is larger than the inductance due to the electrode having the same size as that of the electrode non-forming part 420.
  • the third electrode portion 43E has an electrode non-forming portion 430 at an intermediate position in the extending direction (z direction).
  • the two electrode portions separated by the electrode non-forming portion 430 in the third electrode portion 43E are connected by a mounting inductor 453.
  • the inductance of the mounted inductor 453 is larger than the inductance due to the electrode having the same size as that of the electrode non-forming part 430.
  • the lengths of the second electrode portion 42E and the third electrode portion 43E in the z direction can be reduced, and the parasitic element 40E can be reduced in size.
  • FIGS. 10A, 10B, and 10C are external perspective views of parasitic elements of the antenna device according to the seventh embodiment of the present invention.
  • the antenna device according to the present embodiment differs from the antenna device according to the second embodiment in the shapes of the parasitic elements 40F1, 40F2, and 40F3.
  • Other configurations of the antenna device according to the present embodiment are the same as those of the antenna device according to the second embodiment, and description of the same parts is omitted.
  • the parasitic elements 40F1, 40F2, and 40F3 include a first electrode portion 41F, a second electrode portion 42F, and a third electrode portion 43F.
  • the connection mode of the first electrode part 41F, the second electrode part 42F, and the third electrode part 43F is the same as that of the parasitic element 40A according to the second embodiment.
  • the bent portion FX causes a portion of the first electrode portion 41F having a predetermined length along the z direction to be perpendicular to the surface of the substrate and close to the substrate.
  • the third electrode portion 43F has a shape orthogonal to the surface of the substrate and is close to the substrate by the bent portion FX.
  • the bent portion FX causes the portion of the first electrode portion 41F having a predetermined length along the z direction, the second electrode portion 42F, and the third electrode portion 43F to be on the surface of the substrate.
  • the shape is orthogonal to the substrate and is close to the substrate.
  • the parasitic element becomes closer to the substrate, and the capacitive coupling between the parasitic element and the feeder element is increased. Therefore, similarly to the antenna device according to the second embodiment, the parasitic element can be reduced in size.
  • FIG. 11A is a plan view of a parasitic element of the antenna device according to the eighth embodiment of the present invention.
  • FIG. 11B is a plan view of the parasitic element of the antenna device to be compared.
  • the antenna device 10G according to the present embodiment differs from the antenna device 10 according to the first embodiment in the shape of the parasitic element 40G.
  • the parasitic element 40G includes a first electrode part 41G, a second electrode part 42G, and a third electrode part 43G.
  • the connection mode of the first electrode part 41G, the second electrode part 42G, and the third electrode part 43G is the same as that of the parasitic element 40 according to the first embodiment.
  • the parasitic element 40G includes an R chamfered portion ER41 at the corner of the first electrode portion 41G.
  • the R chamfered portion ER41 includes a bent outer corner portion that connects the first electrode portion 41G and the second electrode portion 42G, and a bent outer corner portion that connects the first electrode portion 41G and the third electrode portion 43G. It is formed in each part.
  • the parasitic element 40G is arranged along the R chamfered shape of the corner portion. Can be placed close together. Further, along with this shape, the second electrode part 42G and the third electrode part 43G can be shortened similarly to the antenna device according to the second embodiment.
  • the first of the casing 90G and the parasitic element 40 ′ In the parasitic element 40 ′ having a comparative shape similar in basic shape to the parasitic element 40 of the first embodiment, the first of the casing 90G and the parasitic element 40 ′. It must be separated from the one electrode portion 41 ′. Further, due to this structure, the second electrode portion 42 ′ and the third electrode portion 43 ′ cannot be shortened.
  • a small antenna device 10G corresponding to the shape of the housing can be realized.
  • each above-mentioned embodiment can be combined suitably, and a parasitic element can be reduced in size by combining these.
  • FIG. 12A, FIG. 12B, FIG. 12C, FIG. 12D, and FIG. 12E are diagrams showing examples of the shape of the power feeding element according to the embodiment of the present invention.
  • 12A to 12E are partial plan views including a feeding element forming portion in the antenna device.
  • the feeding element 20A includes a feeding end side electrode 21 and an open end side electrode 22A.
  • the open end side electrode 22A includes linear electrodes 221, 222, and 223.
  • the linear electrodes 221 and 223 have a shape extending in the y direction, and the linear electrode 222 has a shape extending in the z direction.
  • the length of the linear electrodes 221 and 223 is significantly longer than that of the linear electrode 222.
  • One end of the linear electrode 221 is connected to the power supply end side electrode 21, and the other end is connected to one end of the linear electrode 222.
  • the other end of the linear electrode 222 is connected to one end of the linear electrode 223. That is, the open end side electrode 22A is a folded electrode.
  • the feeding element 20B includes a feeding end side electrode 21 and an open end side electrode 22B.
  • the open end side electrode 22B has a so-called meander shape in which portions extending in the y direction and portions extending in the z direction are alternately connected.
  • the feed element 20C includes a feed end side electrode 21, an open end side electrode 22C, and a short-circuit end side electrode 23C.
  • the feeding element 20C has a so-called inverted F shape.
  • the feed element 20D includes a feed end side electrode 21, an open end side electrode 22D, and a chip inductor 210.
  • the open end side electrode 22 ⁇ / b> D has a shape extending in the y direction, similar to the open end side electrode 22 described above.
  • the power supply end electrode 21 is provided with a separating portion at an intermediate position in the extending direction.
  • the chip inductor 210 is disposed so as to connect portions separated by the separation portion in the power supply end side electrode 21.
  • the feed element 20E includes the feed end side electrode 21 and the chip inductor 210. That is, the feed element 20E has a shape in which the open end side electrode 22D is omitted from the feed element 20D.
  • 10, 10A, 10B, 10C, 10D, 10E, 10G Antenna devices 20, 20A, 20B, 20C, 20D, 20E: Feeding element 21: Feeding end side electrode 22, 22A, 22B, 22C, 22D: Open end side electrode 23C: Short-circuit end side electrode 30: Ground electrodes 40, 40A, 40B, 40C, 40D, 40E, 40F1, 40F2, 40F3, 40G: Parasitic elements 41, 41A, 41B, 41C, 41D, 41E, 41F, 41G: No.

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Abstract

An antenna device (10) is provided with a substrate (300), a ground electrode (30), a power feed element (20), and a parasitic element (40). The length of the substrate (300) in a first direction is not greater than approximately 1/4 of the wavelength of a high-frequency signal to be transmitted or received. The ground electrode (30) is formed on a surface of the substrate (300). The power feed element (20) is formed on a section of the surface of the substrate (300) in which the ground electrode (30) is not formed, and is connected to a power feeding point. The parasitic element (40) is disposed away from the surface of the substrate (300) and is capacitively coupled to the power feed element (20). The parasitic element (40) is provided with a first electrode section (41), a second electrode section (42), and a third electrode section (43). The first electrode section (41) has a shape extending in the first direction. The second electrode section (42) is connected to a first end, in the first direction, of the first electrode section (41), and has a shape extending in a second direction. The third electrode section (43) is connected to a second end, in the first direction, of the first electrode section (41), and has a shape extending in the second direction.

Description

アンテナ装置Antenna device
　本発明は、携帯通信端末等の小型電子機器に収容される小型のアンテナ装置に関する。 The present invention relates to a small antenna device housed in a small electronic device such as a mobile communication terminal.
　携帯通信端末に収容されるアンテナ装置が各種考案されている。例えば、特許文献１には、モノポールアンテナと無給電素子とを用いたアンテナ装置が記載されている。特許文献１に記載のアンテナ装置では、モノポールアンテナと無給電素子とは、Ｌ型の線状導体であり、ともに、携帯通信端末の筐体の幅方向に延びる部分が長く、筐体の縦方向（幅方向および厚み方向に直交する方向）に延びる部分が短い。 Various antenna devices that can be accommodated in portable communication terminals have been devised. For example, Patent Document 1 describes an antenna device using a monopole antenna and a parasitic element. In the antenna device described in Patent Document 1, the monopole antenna and the parasitic element are L-shaped linear conductors, both of which have a long portion extending in the width direction of the casing of the mobile communication terminal, and the vertical length of the casing. A portion extending in a direction (a direction orthogonal to the width direction and the thickness direction) is short.
　モノポールアンテナにおける縦方向に延びる部分の端部は給電点である。無給電素子における縦方向に延びる部分の端部はグランドに接続されている。モノポールアンテナにおける筐体の幅方向に延びる部分の端部（モノポールアンテナの開放端）と、無給電素子における筐体の幅方向に延びる部分の端部（無給電素子の開放端）とは、容量結合している。これにより、モノポールアンテナと無給電素子とによるループアンテナの動作が実現され、無指向性のアンテナが実現されている。 The end of the part extending in the vertical direction in the monopole antenna is a feeding point. The end portion of the parasitic element extending in the vertical direction is connected to the ground. The end of the monopole antenna that extends in the width direction of the casing (the open end of the monopole antenna) and the end of the parasitic element that extends in the width direction of the casing (the open end of the parasitic element) Capacitively coupled. Thereby, the operation of the loop antenna by the monopole antenna and the parasitic element is realized, and an omnidirectional antenna is realized.
特許第４０６３８３３号明細書Japanese Patent No. 4063833
　しかしながら、特許文献１の構成では、モノポールアンテナにおける筐体の幅方向の延びる部分と、これに略同じ長さの無給電素子における筐体の幅方向に延びる部分とを、筐体の幅方向に、間隔を空けて配置しなければならない。 However, in the configuration of Patent Document 1, a portion extending in the width direction of the housing in the monopole antenna and a portion extending in the width direction of the housing in the parasitic element having substantially the same length are arranged in the width direction of the housing. Must be spaced apart.
　このため、無指向性のアンテナを実現するための幅方向の長さがある程度以上必要となり、筐体の小型化を阻害してしまう。 For this reason, the length in the width direction for realizing the omnidirectional antenna is required to some extent, and the downsizing of the casing is hindered.
　したがって、本発明の目的は、小型の無指向性アンテナを提供することにある。 Therefore, an object of the present invention is to provide a small omnidirectional antenna.
　この発明のアンテナ装置は、基板、グランド電極、給電素子、および、無給電素子を備える。基板の第１方向の長さは、送受波対象の高周波信号の波長の略１／４以下である。グランド電極は、基板の表面に形成されている。給電素子は、基板の表面におけるグランド電極の非形成部に形成されており、給電点に接続されている。無給電素子は、基板の表面に直交する第２方向に表面から間隔を空けて配置され、給電素子に容量結合している。無給電素子は、第１電極部、第２電極部、および、第３電極部を備える。第１電極部は、第１方向に延びる形状である。第２電極部は、第１電極部の第１方向の第１端に接続され、第２方向に延びる形状である。第３電極部は、第１電極部の第１方向の第２端に接続され、第２方向に延びる形状である。 The antenna device of the present invention includes a substrate, a ground electrode, a feeding element, and a parasitic element. The length of the substrate in the first direction is approximately ¼ or less of the wavelength of the high-frequency signal to be transmitted and received. The ground electrode is formed on the surface of the substrate. The power feeding element is formed in a portion where the ground electrode is not formed on the surface of the substrate, and is connected to a power feeding point. The parasitic element is disposed at a distance from the surface in a second direction orthogonal to the surface of the substrate, and is capacitively coupled to the feeder element. The parasitic element includes a first electrode part, a second electrode part, and a third electrode part. The first electrode portion has a shape extending in the first direction. The second electrode portion is connected to the first end in the first direction of the first electrode portion and has a shape extending in the second direction. The third electrode portion is connected to the second end in the first direction of the first electrode portion and has a shape extending in the second direction.
　この構成では、無給電素子には、第１方向（基板の横方向）に平行な電流が流れる。一方、基板には、第１方向（基板の横方向）および第２方向（基板の表面に直交する方向）に直交する第３方向（基板の縦方向）に平行な電流が流れる。したがって、第１方向と第３方向を含む平面でのアンテナの指向性は、無指向性に近づく。 In this configuration, a current parallel to the first direction (lateral direction of the substrate) flows through the parasitic element. On the other hand, a current parallel to the third direction (vertical direction of the substrate) perpendicular to the first direction (lateral direction of the substrate) and the second direction (direction orthogonal to the surface of the substrate) flows through the substrate. Therefore, the directivity of the antenna in a plane including the first direction and the third direction approaches omnidirectionality.
　また、この発明のアンテナ装置では、第１電極部の幅は、第２電極部の幅および第３電極の幅よりも大きいことが好ましい。 In the antenna device of the present invention, it is preferable that the width of the first electrode portion is larger than the width of the second electrode portion and the width of the third electrode.
　この構成では、無給電素子と給電素子との容量性結合が大きくなり、周波数を低下できる。言い換えれば、同じ周波数を実現するのであれば、第１電極部の長さを短くできる。 In this configuration, capacitive coupling between the parasitic element and the feeding element is increased, and the frequency can be lowered. In other words, if the same frequency is realized, the length of the first electrode portion can be shortened.
　また、この発明のアンテナ装置では、第１電極部と第２電極部との接続部、および、第１電極部と第３電極部との接続部に設けられた電極非形成部からなるスリットを備えることが好ましい。 In the antenna device according to the present invention, the slit formed of the connection portion between the first electrode portion and the second electrode portion and the electrode non-formation portion provided at the connection portion between the first electrode portion and the third electrode portion is provided. It is preferable to provide.
　この構成では、スリットによって無給電素子の電気長を稼ぐことができるので、無給電素子が小型になる。 In this configuration, since the electrical length of the parasitic element can be earned by the slit, the parasitic element becomes small.
　また、この発明のアンテナ装置では、スリットは、延びる方向の途中で屈曲する形状であることが好ましい。 In the antenna device of the present invention, it is preferable that the slit has a shape that bends in the middle of the extending direction.
　この構成では、無給電素子の電気長をさらに稼ぐことができるので、無給電素子がより小型になる。 In this configuration, since the electric length of the parasitic element can be further increased, the parasitic element becomes smaller.
　また、この発明のアンテナ装置では、第２電極部および第３電極部は、ミアンダ形状であってもよい。 Further, in the antenna device of the present invention, the second electrode portion and the third electrode portion may have a meander shape.
　この構成では、第２電極部および第３電極部の第３方向（基板の縦方向）への長さを長くすることなく、第２電極部および第３電極部の電気長を稼ぐことができるので、無給電素子が小型になる。 In this configuration, the electrical length of the second electrode portion and the third electrode portion can be increased without increasing the length of the second electrode portion and the third electrode portion in the third direction (vertical direction of the substrate). Therefore, the parasitic element becomes small.
　また、この発明のアンテナ装置では、次の構成であってもよい。第２電極部および第３電極部は、延びる方向の途中位置に電極非形成部を有する。該電極非形成部によって離間される電極同士は、実装型インダクタによって接続されている。 Further, the antenna device of the present invention may have the following configuration. The 2nd electrode part and the 3rd electrode part have an electrode non-formation part in the middle position of the extending direction. The electrodes separated by the electrode non-forming portion are connected by a mounting type inductor.
　この構成では、実装型インダクタによって、第２電極部および第３電極部の電気長を稼ぐことができるので、無給電素子が小型になる。 In this configuration, since the electrical lengths of the second electrode portion and the third electrode portion can be earned by the mounting type inductor, the parasitic element becomes small.
　また、この発明のアンテナ装置では、無給電素子は、基板側に屈曲する屈曲部を有していてもよい。 In the antenna device of the present invention, the parasitic element may have a bent portion that bends toward the substrate.
　この構成では、無給電素子の平面形状（第１方向と第３方向を含む平面）を大きくすることなく、給電素子との容量性結合が大きくなり、周波数を低下できる。言い換えれば、同じ周波数を実現するのであれば、無給電素子が小型化される。 In this configuration, capacitive coupling with the feed element is increased and the frequency can be reduced without increasing the planar shape of the parasitic element (a plane including the first direction and the third direction). In other words, if the same frequency is realized, the parasitic element is reduced in size.
　また、この発明のアンテナ装置では、第１電極部における第２電極部への接続部と第３電極部への接続部との間の長さは、高周波信号の波長の略１／１０から略１／４であることが好ましい。 In the antenna device of the present invention, the length between the connection portion to the second electrode portion and the connection portion to the third electrode portion in the first electrode portion is approximately 1/10 to the wavelength of the high-frequency signal. It is preferable that it is 1/4.
　この構成では、無指向性のアンテナ特性がより確実且つ正確に実現される。 In this configuration, omnidirectional antenna characteristics can be realized more reliably and accurately.
　この発明によれば、無指向性のアンテナを小型に実現できる。 According to this invention, an omnidirectional antenna can be realized in a small size.
本発明の第１の実施形態に係るアンテナ装置の外観斜視図である。1 is an external perspective view of an antenna device according to a first embodiment of the present invention. 本発明の第１の実施形態に係るアンテナ装置の平面図である。1 is a plan view of an antenna device according to a first embodiment of the present invention. （Ａ）、（Ｂ）、（Ｃ）、（Ｄ）は、無給電素子の形状に応じた指向性の変化を説明する図である。(A), (B), (C), (D) is a figure explaining the change of directivity according to the shape of a parasitic element. グランド電極の幅（ｙ方向の長さ）をλ／２にした場合の形状および指向性特性を示す図である。It is a figure which shows a shape and directivity characteristic when the width | variety (length of ay direction) of a ground electrode is set to (lambda) / 2. 本発明の第２の実施形態に係るアンテナ装置の無給電素子の平面図である。It is a top view of the parasitic element of the antenna device which concerns on the 2nd Embodiment of this invention. 本発明の第３の実施形態に係るアンテナ装置の無給電素子の平面図である。It is a top view of the parasitic element of the antenna device which concerns on the 3rd Embodiment of this invention. 本発明の第４の実施形態に係るアンテナ装置の無給電素子の平面図である。It is a top view of the parasitic element of the antenna device which concerns on the 4th Embodiment of this invention. 本発明の第５の実施形態に係るアンテナ装置の無給電素子の平面図である。It is a top view of the parasitic element of the antenna device which concerns on the 5th Embodiment of this invention. 本発明の第６の実施形態に係るアンテナ装置の無給電素子の平面図である。It is a top view of the parasitic element of the antenna device which concerns on the 6th Embodiment of this invention. （Ａ）、（Ｂ）、（Ｃ）は、本発明の第７の実施形態に係るアンテナ装置の無給電素子の外観斜視図である。(A), (B), (C) is an external perspective view of a parasitic element of an antenna device according to a seventh embodiment of the present invention. （Ａ）は、本発明の第８の実施形態に係るアンテナ装置の無給電素子の平面図であり、（Ｂ）は、比較対象のアンテナ装置の無給電素子の平面図である。(A) is a top view of the parasitic element of the antenna apparatus which concerns on the 8th Embodiment of this invention, (B) is a top view of the parasitic element of the antenna apparatus of a comparison object. （Ａ）－（Ｅ）は、本発明の実施形態に係る給電素子の形状例を示す図である。(A)-(E) is a figure which shows the example of a shape of the electric power feeding element which concerns on embodiment of this invention.
　本発明の第１の実施形態に係るアンテナ装置について、図を参照して説明する。図１は、本発明の第１の実施形態に係るアンテナ装置の外観斜視図である。図２は、本発明の第１の実施形態に係るアンテナ装置の平面図である。 The antenna device according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of the antenna device according to the first embodiment of the present invention. FIG. 2 is a plan view of the antenna device according to the first embodiment of the present invention.
　アンテナ装置１０は、給電素子２０、グランド電極３０、無給電素子４０、および、基板３００を備える。アンテナ装置１０は、携帯通信機器等の筐体９０内に配置されている。 The antenna device 10 includes a feeding element 20, a ground electrode 30, a parasitic element 40, and a substrate 300. The antenna device 10 is disposed in a housing 90 such as a portable communication device.
　基板３００は、絶縁性基材からなり、ｙ方向（第１方向）の長さがｚ方向（第３方向）の長さよりも短い。基板３００のｙ方向の長さは、アンテナ装置１０の送受波対象の高周波信号の波長の略１／４以下である。 The substrate 300 is made of an insulating base material, and the length in the y direction (first direction) is shorter than the length in the z direction (third direction). The length of the substrate 300 in the y direction is approximately ¼ or less of the wavelength of the high frequency signal to be transmitted and received by the antenna device 10.
　なお、ｙ方向（第１方向）が、基板３００の横方向であり、ｚ方向（第３方向）が、基板３００の縦方向である。そして、基板３００の厚み方向、すなわち、基板３００の表面に直交する方向を、ｘ方向（第２方向）とする。 Note that the y direction (first direction) is the lateral direction of the substrate 300, and the z direction (third direction) is the longitudinal direction of the substrate 300. A thickness direction of the substrate 300, that is, a direction orthogonal to the surface of the substrate 300 is defined as an x direction (second direction).
　グランド電極３０および給電素子２０は、基板３００の表面に形成されている。グランド電極３０および給電素子２０は、例えば、銅（Ｃｕ）等からなる。グランド電極３０は、基板３００のｚ方向の一方端側の所定長さの部分を除いて、略全面に形成されている。 The ground electrode 30 and the power feeding element 20 are formed on the surface of the substrate 300. The ground electrode 30 and the power feeding element 20 are made of, for example, copper (Cu). The ground electrode 30 is formed on substantially the entire surface except for a portion of a predetermined length on one end side in the z direction of the substrate 300.
　給電素子２０は、基板３００におけるグランド電極３０の非形成領域に形成されている。給電素子２０は、線状電極である。給電素子２０は、ｚ方向に延びる給電端側電極２１と、ｙ方向に延びる開放端側電極２２とが接続されてなる。したがって、給電素子２０は、延びる方向の途中で屈曲するＬ字型の線状電極である。給電素子２０の長さは、高周波信号の波長の略１／４であり、開放端側電極２２の長さが給電素子２０の長さに近くなるほど好ましい。 The feeding element 20 is formed in a region where the ground electrode 30 is not formed on the substrate 300. The power feeding element 20 is a linear electrode. The power supply element 20 is formed by connecting a power supply end side electrode 21 extending in the z direction and an open end side electrode 22 extending in the y direction. Therefore, the power feeding element 20 is an L-shaped linear electrode that bends in the middle of the extending direction. The length of the power feeding element 20 is approximately ¼ of the wavelength of the high-frequency signal, and the length of the open end side electrode 22 is preferably closer to the length of the power feeding element 20.
　給電端側電極２１における開放端側電極２２と反対側の端部は、グランド電極３０に近接している。この給電端側電極２１とグランド電極３０との近接点が、給電素子２０の給電点ＦＰである。 The end of the power supply end electrode 21 opposite to the open end side electrode 22 is close to the ground electrode 30. A proximity point between the feeding end side electrode 21 and the ground electrode 30 is a feeding point FP of the feeding element 20.
　給電点ＦＰは、基板３００のｙ方向の一方端付近に配置されている。また、開放端側電極２２における給電端側電極２１と反対側の端部、すなわち、給電素子２０の開放端は、基板３００のｙ方向の他方端付近に配置されている。 The feeding point FP is disposed near one end of the substrate 300 in the y direction. In addition, the end of the open end side electrode 22 opposite to the power feed end side electrode 21, that is, the open end of the feed element 20 is disposed near the other end of the substrate 300 in the y direction.
　これらの構成によって、基板３００のｙ方向の長さ（基板３００の横方向の長さ）を、高周波信号の送受波に必要な最小限の長さにできる。 With these configurations, the length in the y direction of the substrate 300 (the length in the lateral direction of the substrate 300) can be set to a minimum length necessary for transmitting and receiving a high-frequency signal.
　無給電素子４０は、基板３００の表面からｘ方向に離間して配置されている。無給電素子４０は、給電素子２０に対して容量結合する位置に配置されている。具体的には、図２に示すように、ｙ方向およびｚ方向を含む平面を平面視して、無給電素子４０は、給電素子２０の少なくとも一部に重なっている。また、無給電素子４０は、グランド電極３０の一部に重なっている。無給電素子４０は、給電素子２０と同様に、銅（Ｃｕ）等からなる。 The parasitic element 40 is arranged away from the surface of the substrate 300 in the x direction. The parasitic element 40 is disposed at a position where the parasitic element 40 is capacitively coupled to the feeder element 20. Specifically, as shown in FIG. 2, the parasitic element 40 overlaps at least a part of the feeding element 20 in a plan view including a plane including the y direction and the z direction. The parasitic element 40 overlaps a part of the ground electrode 30. The parasitic element 40 is made of copper (Cu) or the like, similar to the feeder element 20.
　無給電素子４０は、第１電極部４１、第２電極部４２、および、第３電極部４３を備える。第１電極部４１、第２電極部４２、および、第３電極部４３は、帯状電極である。すなわち、第１電極部４１、第２電極部４２、および、第３電極部４３は、給電素子２０よりも幅広の電極である。第２電極部４２の長さと第３電極部４３の長さとは、略同じである。 The parasitic element 40 includes a first electrode part 41, a second electrode part 42, and a third electrode part 43. The 1st electrode part 41, the 2nd electrode part 42, and the 3rd electrode part 43 are strip | belt-shaped electrodes. That is, the first electrode part 41, the second electrode part 42, and the third electrode part 43 are electrodes wider than the power feeding element 20. The length of the second electrode portion 42 and the length of the third electrode portion 43 are substantially the same.
　第１電極部４１は、ｙ方向に延びる形状である。第２電極部４２および第３電極部４３は、ｚ方向に延びる形状である。第２電極部４２は、第１電極部４１におけるｙ方向の一方端（第１端）に接続されている。第３電極部４３は、第１電極部４１におけるｙ方向の他方端（第２端）に接続されている。第２電極部４２と第３電極部４３とは、ｚ方向において、第１電極部４１に対して、同じ側に配置されている。 The first electrode portion 41 has a shape extending in the y direction. The 2nd electrode part 42 and the 3rd electrode part 43 are the shapes extended in az direction. The second electrode portion 42 is connected to one end (first end) in the y direction of the first electrode portion 41. The third electrode portion 43 is connected to the other end (second end) in the y direction of the first electrode portion 41. The second electrode portion 42 and the third electrode portion 43 are disposed on the same side with respect to the first electrode portion 41 in the z direction.
　無給電素子４０の長さ、すなわち、第２電極部４２、第１電極部４１、および、第３電極部４３の順に繋がる形状の長さは、高周波信号の波長の略１／２である。 The length of the parasitic element 40, that is, the length of the shape connected in the order of the second electrode portion 42, the first electrode portion 41, and the third electrode portion 43 is approximately ½ of the wavelength of the high-frequency signal.
　このような構成の場合、アンテナ装置１０では、給電点ＦＰに高周波信号が給電されると、基板３００すなわちグランド電極３０の形状に応じて、ｚ方向に流れる電流は大きくなり、ｙ方向に流れる電流は小さくなる。一方、無給電素子４０が上述の構成であることによって、第２電極部４２および第３電極部４３に流れる電流が互いに逆方向で打ち消されるため、無給電素子４０では、第１電極部４１に流れる電流、すなわち、ｙ方向に流れる電流が大きくなる。これにより、アンテナ装置１０によって放射される高周波信号の指向性は、ｙ方向およびｚ方向を含む平面において、全方位に対するＮＵＬＬが殆ど生じず、無指向性に近いものとなる。したがって、アンテナ装置１０の形状、特にｙ方向（基板の幅方向）の形状を大きくすることなく、無指向性を実現できる。 In such a configuration, in the antenna device 10, when a high frequency signal is fed to the feeding point FP, the current flowing in the z direction increases according to the shape of the substrate 300, that is, the ground electrode 30, and the current flowing in the y direction. Becomes smaller. On the other hand, since the parasitic element 40 has the above-described configuration, the currents flowing through the second electrode portion 42 and the third electrode portion 43 are canceled in opposite directions. The flowing current, that is, the current flowing in the y direction increases. As a result, the directivity of the high-frequency signal radiated by the antenna device 10 is almost non-directional with almost no NULL in all directions in the plane including the y direction and the z direction. Therefore, omnidirectionality can be realized without increasing the shape of the antenna device 10, particularly the shape in the y direction (the width direction of the substrate).
　なお、無給電素子４０の形状は次の形状であることが好ましい。図３（Ａ）－（Ｄ）は、無給電素子の形状に応じた指向性の変化を説明する図である。図３（Ａ）－（Ｄ）では、無給電素子の第１電極部の長さを変化させた場合の指向性の変化を示している。図３（Ａ）－（Ｄ）では、紙面に向かって左欄に形状を示し、紙面に向かって右欄に指向性特性を示す。 Note that the parasitic element 40 preferably has the following shape. FIGS. 3A to 3D are diagrams for explaining the change in directivity according to the shape of the parasitic element. 3A to 3D show changes in directivity when the length of the first electrode portion of the parasitic element is changed. 3 (A) to 3 (D), the shape is shown in the left column toward the paper surface, and the directivity characteristic is shown in the right column toward the paper surface.
　なお、第１電極部の長さの変化に応じて、第２電極部と第３電極部との長さも変化しており、無給電素子の長さは、高周波信号の波長の略１／２を維持している。 Note that the lengths of the second electrode portion and the third electrode portion also change in accordance with the change in the length of the first electrode portion, and the length of the parasitic element is approximately ½ of the wavelength of the high-frequency signal. Is maintained.
　また、図３（Ａ）－（Ｄ）におけるＬｗは、第１電極部における第２電極部への接続端と、第３電極部への接続端との距離（ｙ方向の長さ）を示している。高周波信号の波長をλとして、図３（Ａ）ではＬｗ＝λ／２、図３（Ｂ）ではＬｗ＝λ／４、図３（Ｃ）ではＬｗ＝λ／１０、図３（Ｄ）ではＬｗ＝λ／２０である。また、図３（Ａ）－（Ｄ）の指向性特性図において、０°方向および１８０°方向が基板の縦方向（ｚ方向）であり、９０°方向および２７０°方向が基板の横方向（ｙ方向）である。 Also, Lw in FIGS. 3A to 3D indicates the distance (the length in the y direction) between the connection end to the second electrode portion and the connection end to the third electrode portion in the first electrode portion. ing. 3A, Lw = λ / 2 in FIG. 3A, Lw = λ / 4 in FIG. 3B, Lw = λ / 10 in FIG. 3C, and Lw = λ / 10 in FIG. Lw = λ / 20. 3A to 3D, the 0 ° direction and the 180 ° direction are the vertical direction (z direction) of the substrate, and the 90 ° direction and the 270 ° direction are the horizontal direction ( y direction).
　図示していないが、無給電素子４０を配置しない態様では、８の字の指向性、すなわち、基板３００の縦方向の電界強度が大幅に低く、０°方向および１８０°方向にＮＵＬＬが生じる。 Although not shown, in the aspect in which the parasitic element 40 is not arranged, the directivity of the figure 8, that is, the electric field strength in the vertical direction of the substrate 300 is significantly low, and NULL is generated in the 0 ° direction and the 180 ° direction.
　図３（Ａ）に示すように、Ｌｗ＝λ／２では、無給電素子４０を配置しない態様と比較して、略全周方向への特性は改善するものの、０°方向付近にＮＵＬＬが生じてしまう。また、図３（Ｄ）に示すように、Ｌｗ＝λ／２０では、無給電素子４０を配置しない態様と比較して、略全周方向への特性は改善するものの、２１０°方向付近および３３０°方向付近に、放射が弱い箇所（方位）が生じてしまう。 As shown in FIG. 3 (A), when Lw = λ / 2, compared to the case where the parasitic element 40 is not disposed, the characteristics in the substantially entire circumferential direction are improved, but NULL is generated in the vicinity of the 0 ° direction. End up. Further, as shown in FIG. 3D, when Lw = λ / 20, the characteristics in the substantially entire circumferential direction are improved as compared with the aspect in which the parasitic element 40 is not disposed, but the vicinity of the 210 ° direction and 330 In the vicinity of the ° direction, there are places (orientations) where the radiation is weak.
　しかしながら、図３（Ｂ）、図３（Ｃ）に示すように、Ｌｗ＝λ／４、Ｌｗ＝λ／１０では、全周においてＮＵＬＬが生じない。 However, as shown in FIGS. 3B and 3C, NULL does not occur in the entire circumference when Lw = λ / 4 and Lw = λ / 10.
　なお、図示していないが、Ｌｗがλ／４とλ／１０の間にある場合、全周においてＮＵＬＬは生じない。 Although not shown, when Lw is between λ / 4 and λ / 10, NULL does not occur in the entire circumference.
　また、図示していないが、Ｌｗがλ／４よりも長い場合、Ｌｗがλ／１０よりも短い場合には、放射の強弱こそあれ、ＮＵＬＬが生じてしまう。 Although not shown, when Lw is longer than λ / 4 and Lw is shorter than λ / 10, NULL is generated regardless of the intensity of radiation.
　したがって、無給電素子４０では、第１電極部における第２電極部への接続端と第３電極部への接続端との距離をλ／４からλ／１０の間にすることによって、より正確且つ確実に無指向性を実現できる。 Accordingly, in the parasitic element 40, the distance between the connection end to the second electrode portion and the connection end to the third electrode portion in the first electrode portion is set between λ / 4 and λ / 10 to be more accurate. And omnidirectionality can be realized reliably.
　なお、基板３００の幅（ｙ方向の長さ）、すなわち、グランド電極３０の幅（ｙ方向の長さ）は、略λ／４以下であることが好ましい。図４は、グランド電極の幅（ｙ方向の長さ）をλ／２にした場合の形状および指向性特性を示す図である。 Note that the width of the substrate 300 (the length in the y direction), that is, the width of the ground electrode 30 (the length in the y direction) is preferably approximately λ / 4 or less. FIG. 4 is a diagram showing the shape and directivity characteristics when the width (length in the y direction) of the ground electrode is λ / 2.
　図４に示すように、グランド電極３０の幅（ｙ方向の長さ）をλ／２にした場合、約１２５°方向、約２１５°方向にＮＵＬＬが生じてしまう。なお、図示していないが、グランド電極３０の幅（ｙ方向の長さ）をλ／４から長くするほどＮＵＬＬは生じ易くなる。したがって、グランド電極３０の幅（ｙ方向の長さ）は、略λ／４以下であることが好ましい。 As shown in FIG. 4, when the width (the length in the y direction) of the ground electrode 30 is λ / 2, NULL occurs in about 125 ° direction and about 215 ° direction. Although not shown, NULL is more likely to occur as the width (length in the y direction) of the ground electrode 30 is increased from λ / 4. Therefore, the width of the ground electrode 30 (the length in the y direction) is preferably approximately λ / 4 or less.
　なお、グランド電極３０の幅（ｙ方向の長さ）は、製品として求められる形状に応じて、適宜設定すればよく、放射電力等も考慮して、グランド電極３０の幅（ｙ方向の長さ）は、略λ／４以下で適宜設定すればよい。 The width of the ground electrode 30 (the length in the y direction) may be set as appropriate according to the shape required for the product, and the width of the ground electrode 30 (the length in the y direction) is also taken into account, for example, the radiated power ) May be appropriately set to approximately λ / 4 or less.
　次に、本発明の第２の実施形態に係るアンテナ装置について、図を参照して説明する。図５は、本発明の第２の実施形態に係るアンテナ装置の無給電素子の平面図である。図５において、実線が本実施形態に係る無給電素子４０Ａの形状を示し、点線が第１の実施形態に係る無給電素子４０の形状を示す。 Next, an antenna device according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a plan view of a parasitic element of the antenna device according to the second embodiment of the present invention. In FIG. 5, the solid line indicates the shape of the parasitic element 40 </ b> A according to the present embodiment, and the dotted line indicates the shape of the parasitic element 40 according to the first embodiment.
　本実施形態に係るアンテナ装置は、第１の実施形態に係るアンテナ装置１０に対して、無給電素子４０Ａの形状において異なる。本実施形態に係るアンテナ装置の他の構成は、第１の実施形態に係るアンテナ装置１０と同様であり、同様の箇所の説明は省略する。 The antenna device according to the present embodiment differs from the antenna device 10 according to the first embodiment in the shape of the parasitic element 40A. Other configurations of the antenna device according to the present embodiment are the same as those of the antenna device 10 according to the first embodiment, and the description of the same parts is omitted.
　無給電素子４０Ａは、第１電極部４１Ａ、第２電極部４２Ａ、および第３電極部４３Ａを備える。第１電極部４１Ａ、第２電極部４２Ａ、および、第３電極部４３Ａの接続態様は、第１の実施形態に係る無給電素子４０と同様である。 The parasitic element 40A includes a first electrode portion 41A, a second electrode portion 42A, and a third electrode portion 43A. The connection mode of the first electrode part 41A, the second electrode part 42A, and the third electrode part 43A is the same as that of the parasitic element 40 according to the first embodiment.
　第１電極部４１Ａの幅Ｗ４１Ａは、第１の実施形態に係る第１電極部４１の幅Ｗ４１よりも大きい。第１電極部４１、４１Ａの幅とは、ｚ方向（基板の縦方向）の長さである。 The width W41A of the first electrode portion 41A is larger than the width W41 of the first electrode portion 41 according to the first embodiment. The width of the first electrode portions 41 and 41A is the length in the z direction (vertical direction of the substrate).
　このような構成とすることによって、第１の実施形態に係る無給電素子４０と比較して、無給電素子４０Ａは、給電素子に対する容量性結合が大きくなる。したがって、第２電極部４２Ａおよび第３電極部４３Ａの長さを、第１の実施形態に係る第２電極部４２および第３電極部４３と同じにした場合、アンテナ装置１０としての周波数は低くなる。言い換えれば、アンテナ装置１０としての周波数を変化させない場合、図５に示すように、第２電極部４２Ａおよび第３電極部４３Ａの長さは、第１の実施形態に係る第２電極部４２および第３電極部４３よりも小さくできる。すなわち、無給電素子４０Ａのｚ方向（基板の縦方向）の大きさを小さくできる。 With such a configuration, the parasitic element 40A has a larger capacitive coupling to the feeding element than the parasitic element 40 according to the first embodiment. Therefore, when the lengths of the second electrode portion 42A and the third electrode portion 43A are the same as those of the second electrode portion 42 and the third electrode portion 43 according to the first embodiment, the frequency as the antenna device 10 is low. Become. In other words, when the frequency of the antenna device 10 is not changed, as shown in FIG. 5, the lengths of the second electrode portion 42A and the third electrode portion 43A are the second electrode portion 42 and the second electrode portion 42 according to the first embodiment. It can be made smaller than the third electrode portion 43. That is, the size of the parasitic element 40A in the z direction (vertical direction of the substrate) can be reduced.
　次に、本発明の第３の実施形態に係るアンテナ装置について、図を参照して説明する。図６は、本発明の第３の実施形態に係るアンテナ装置の無給電素子の平面図である。 Next, an antenna device according to a third embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a plan view of a parasitic element of the antenna device according to the third embodiment of the present invention.
　本実施形態に係るアンテナ装置は、第２の実施形態に係るアンテナ装置に対して、無給電素子４０Ｂの形状において異なる。本実施形態に係るアンテナ装置の他の構成は、第２の実施形態に係るアンテナ装置と同様であり、同様の箇所の説明は省略する。 The antenna device according to the present embodiment differs from the antenna device according to the second embodiment in the shape of the parasitic element 40B. Other configurations of the antenna device according to the present embodiment are the same as those of the antenna device according to the second embodiment, and description of the same parts is omitted.
　無給電素子４０Ｂは、第１電極部４１Ｂ、第２電極部４２Ｂ、および、第３電極部４３Ｂを備える。第１電極部４１Ｂ、第２電極部４２Ｂ、および、第３電極部４３Ｂの接続態様は、第２の実施形態に係る無給電素子４０Ａと同様である。 The parasitic element 40B includes a first electrode part 41B, a second electrode part 42B, and a third electrode part 43B. The connection mode of the first electrode part 41B, the second electrode part 42B, and the third electrode part 43B is the same as that of the parasitic element 40A according to the second embodiment.
　第１電極部４１Ｂと第２電極部４２Ｂとの接続部には、スリット４４２Ｂが設けられている。スリット４４２Ｂは、第１電極部４１Ｂに対してｚ方向に延びる電極非形成部を設けることによって実現されている。スリット４４２Ｂは、第１電極部４１Ｂから第２電極部４２Ｂに繋がる屈曲形状の内側に設けられている。 A slit 442B is provided at a connection portion between the first electrode portion 41B and the second electrode portion 42B. The slit 442B is realized by providing an electrode non-forming portion extending in the z direction with respect to the first electrode portion 41B. The slit 442B is provided inside the bent shape that connects the first electrode portion 41B to the second electrode portion 42B.
　第１電極部４１Ｂと第３電極部４３Ｂとの接続部には、スリット４４３Ｂが設けられている。スリット４４３Ｂは、第１電極部４１Ｂに対してｚ方向に延びる電極非形成部を設けることによって実現されている。スリット４４３Ｂは、第１電極部４１Ｂから第３電極部４３Ｂに繋がる屈曲形状の内側に設けられている。 A slit 443B is provided at a connection portion between the first electrode portion 41B and the third electrode portion 43B. The slit 443B is realized by providing an electrode non-forming portion extending in the z direction with respect to the first electrode portion 41B. The slit 443B is provided inside the bent shape that connects the first electrode part 41B to the third electrode part 43B.
　このような構成とすることによって、無給電素子４０Ｂの電気長を長くできる。これにより、無給電素子４０Ｂの長さを短くでき、無給電素子４０Ｂを小型にできる。 With this configuration, the electrical length of the parasitic element 40B can be increased. Thereby, the length of the parasitic element 40B can be shortened, and the parasitic element 40B can be reduced in size.
　次に、本発明の第４の実施形態に係るアンテナ装置について、図を参照して説明する。図７は、本発明の第４の実施形態に係るアンテナ装置の無給電素子の平面図である。 Next, an antenna device according to a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 7 is a plan view of a parasitic element of the antenna device according to the fourth embodiment of the present invention.
　本実施形態に係るアンテナ装置は、第２の実施形態に係るアンテナ装置に対して、無給電素子４０Ｃの形状において異なる。本実施形態に係るアンテナ装置の他の構成は、第２の実施形態に係るアンテナ装置と同様であり、同様の箇所の説明は省略する。 The antenna device according to the present embodiment differs from the antenna device according to the second embodiment in the shape of the parasitic element 40C. Other configurations of the antenna device according to the present embodiment are the same as those of the antenna device according to the second embodiment, and description of the same parts is omitted.
　無給電素子４０Ｃは、第１電極部４１Ｃ、第２電極部４２Ｃ、および、第３電極部４３Ｃを備える。第１電極部４１Ｃ、第２電極部４２Ｃ、および、第３電極部４３Ｃの接続態様は、第２の実施形態に係る無給電素子４０Ａと同様である。 The parasitic element 40C includes a first electrode portion 41C, a second electrode portion 42C, and a third electrode portion 43C. The connection mode of the first electrode part 41C, the second electrode part 42C, and the third electrode part 43C is the same as that of the parasitic element 40A according to the second embodiment.
　第１電極部４１Ｃと第２電極部４２Ｃとの接続部には、スリット４４２Ｃが設けられている。スリット４４２Ｃは、第１電極部４１Ｃに対して設けられた電極非形成部４４２１Ｃ、４４２２Ｃとからなる。電極非形成部４４２１Ｃは、第１電極部４１Ｃの幅方向の端辺に開口し、ｚ方向に延びる形状である。電極非形成部４４２２Ｃは、電極非形成部４４２１Ｃに連続し、ｙ方向に延びる形状である。スリット４４２Ｃは、第１電極部４１Ｃから第２電極部４２Ｃに繋がる屈曲形状の内側に設けられている。 A slit 442C is provided at a connection portion between the first electrode portion 41C and the second electrode portion 42C. The slit 442C includes electrode non-forming parts 4421C and 4422C provided for the first electrode part 41C. The electrode non-forming portion 4421C has a shape that opens at the end in the width direction of the first electrode portion 41C and extends in the z direction. The electrode non-forming portion 4422C is continuous with the electrode non-forming portion 4421C and has a shape extending in the y direction. The slit 442C is provided inside the bent shape that connects the first electrode portion 41C to the second electrode portion 42C.
　第１電極部４１Ｃと第３電極部４３Ｃとの接続部には、スリット４４３Ｃが設けられている。スリット４４３Ｃは、第１電極部４１Ｃに対して設けられた電極非形成部４４３１Ｃ、４４３２Ｃとからなる。電極非形成部４４３１Ｃは、第１電極部４１Ｃの幅方向の端辺に開口し、ｚ方向に延びる形状である。電極非形成部４４３２Ｃは、電極非形成部４４３１Ｃに連続し、ｙ方向に延びる形状である。スリット４４３Ｃは、第１電極部４１Ｃから第３電極部４３Ｃに繋がる屈曲形状の内側に設けられている。 A slit 443C is provided at a connection portion between the first electrode portion 41C and the third electrode portion 43C. The slit 443C includes electrode non-formation parts 4431C and 4432C provided for the first electrode part 41C. The electrode non-forming portion 4431C has a shape that opens at the end in the width direction of the first electrode portion 41C and extends in the z direction. The electrode non-forming portion 4432C has a shape that is continuous with the electrode non-forming portion 4431C and extends in the y direction. The slit 443C is provided inside the bent shape that connects the first electrode portion 41C to the third electrode portion 43C.
　このような構成とすることによって、無給電素子４０Ｂの電気長を長くできる。この際、第１電極部の形状が同じであれば、第３の実施形態に係る無給電素子４０Ａよりも電気長を長くできる。これにより、無給電素子４０Ｃの長さをさらに短くでき、無給電素子４０Ｃをさらに小型にできる。 With this configuration, the electrical length of the parasitic element 40B can be increased. At this time, if the shape of the first electrode portion is the same, the electrical length can be made longer than that of the parasitic element 40A according to the third embodiment. Thereby, the length of the parasitic element 40C can be further shortened, and the parasitic element 40C can be further reduced in size.
　次に、本発明の第５の実施形態に係るアンテナ装置について、図を参照して説明する。図８は、本発明の第５の実施形態に係るアンテナ装置の無給電素子の平面図である。 Next, an antenna device according to a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 8 is a plan view of a parasitic element of the antenna device according to the fifth embodiment of the present invention.
　本実施形態に係るアンテナ装置は、第２の実施形態に係るアンテナ装置に対して、無給電素子４０Ｄの形状において異なる。本実施形態に係るアンテナ装置の他の構成は、第２の実施形態に係るアンテナ装置と同様であり、同様の箇所の説明は省略する。 The antenna device according to the present embodiment differs from the antenna device according to the second embodiment in the shape of the parasitic element 40D. Other configurations of the antenna device according to the present embodiment are the same as those of the antenna device according to the second embodiment, and description of the same parts is omitted.
　無給電素子４０Ｄは、第１電極部４１Ｄ、第２電極部４２Ｄ、および、第３電極部４３Ｄを備える。第１電極部４１Ｄ、第２電極部４２Ｄ、および、第３電極部４３Ｄの接続態様は、第２の実施形態に係る無給電素子４０Ａと同様である。第１電極部４１Ｄの形状は、第２の実施形態に係る第１電極部４１Ａと同様である。 The parasitic element 40D includes a first electrode part 41D, a second electrode part 42D, and a third electrode part 43D. The connection mode of the first electrode portion 41D, the second electrode portion 42D, and the third electrode portion 43D is the same as that of the parasitic element 40A according to the second embodiment. The shape of the first electrode portion 41D is the same as that of the first electrode portion 41A according to the second embodiment.
　第２電極部４２Ｄおよび第３電極部４３Ｄは、ミアンダ形状である。この際、第２電極部４２Ｄおよび第３電極部４３Ｄは、第１電極部４１Ｄのｙ方向の中心を通り、ｚ方向に延びる基準線に対して、線対称の形状であることが好ましい。 The second electrode part 42D and the third electrode part 43D have a meander shape. At this time, it is preferable that the second electrode portion 42D and the third electrode portion 43D have a line-symmetric shape with respect to a reference line that passes through the center in the y direction of the first electrode portion 41D and extends in the z direction.
　このような構成とすることによって、第２電極部４２Ｄおよび第３電極部４３Ｄのｚ方向の長さを短くしながら、無給電素子４０Ｄが所定の電気長を有することができる。これにより、無給電素子４０Ｄを小型にできる。 With such a configuration, the parasitic element 40D can have a predetermined electrical length while shortening the lengths of the second electrode portion 42D and the third electrode portion 43D in the z direction. Thereby, parasitic element 40D can be reduced in size.
　次に、本発明の第６の実施形態に係るアンテナ装置について、図を参照して説明する。図９は、本発明の第６の実施形態に係るアンテナ装置の無給電素子の平面図である。 Next, an antenna device according to a sixth embodiment of the present invention will be described with reference to the drawings. FIG. 9 is a plan view of a parasitic element of the antenna device according to the sixth embodiment of the present invention.
　本実施形態に係るアンテナ装置は、第２の実施形態に係るアンテナ装置に対して、無給電素子４０Ｅの形状において異なる。本実施形態に係るアンテナ装置の他の構成は、第２の実施形態に係るアンテナ装置と同様であり、同様の箇所の説明は省略する。 The antenna device according to the present embodiment differs from the antenna device according to the second embodiment in the shape of the parasitic element 40E. Other configurations of the antenna device according to the present embodiment are the same as those of the antenna device according to the second embodiment, and description of the same parts is omitted.
　無給電素子４０Ｅは、第１電極部４１Ｅ、第２電極部４２Ｅ、および、第３電極部４３Ｅを備える。第１電極部４１Ｅ、第２電極部４２Ｅ、および、第３電極部４３Ｅの接続態様は、第２の実施形態に係る無給電素子４０Ａと同様である。第１電極部４１Ｅの形状は、第２の実施形態に係る第１電極部４１Ｅと同様である。 The parasitic element 40E includes a first electrode part 41E, a second electrode part 42E, and a third electrode part 43E. The connection mode of the first electrode part 41E, the second electrode part 42E, and the third electrode part 43E is the same as that of the parasitic element 40A according to the second embodiment. The shape of the first electrode part 41E is the same as that of the first electrode part 41E according to the second embodiment.
　第２電極部４２Ｅは、延びる方向（ｚ方向）の途中位置に、電極非形成部４２０を有する。第２電極部４２Ｅにおける電極非形成部４２０によって分離された２個の電極部は、実装型インダクタ４５２によって接続されている。実装型インダクタ４５２のインダクタンスは、電極非形成部４２０と同じ大きさの電極によるインダクタンスよりも大きい。 The second electrode portion 42E has an electrode non-forming portion 420 at a midpoint in the extending direction (z direction). The two electrode portions separated by the electrode non-forming portion 420 in the second electrode portion 42E are connected by a mounting inductor 452. The inductance of the mounted inductor 452 is larger than the inductance due to the electrode having the same size as that of the electrode non-forming part 420.
　第３電極部４３Ｅは、延びる方向（ｚ方向）の途中位置に、電極非形成部４３０を有する。第３電極部４３Ｅにおける電極非形成部４３０によって分離された２個の電極部は、実装型インダクタ４５３によって接続されている。実装型インダクタ４５３のインダクタンスは、電極非形成部４３０と同じ大きさの電極によるインダクタンスよりも大きい。 The third electrode portion 43E has an electrode non-forming portion 430 at an intermediate position in the extending direction (z direction). The two electrode portions separated by the electrode non-forming portion 430 in the third electrode portion 43E are connected by a mounting inductor 453. The inductance of the mounted inductor 453 is larger than the inductance due to the electrode having the same size as that of the electrode non-forming part 430.
　このような構成とすることによって、第２電極部４２Ｅおよび第３電極部４３Ｅのｚ方向の長さを小さくでき、無給電素子４０Ｅを小型にできる。 By adopting such a configuration, the lengths of the second electrode portion 42E and the third electrode portion 43E in the z direction can be reduced, and the parasitic element 40E can be reduced in size.
　次に、本発明の第７の実施形態に係るアンテナ装置について、図を参照して説明する。図１０（Ａ）、（Ｂ）、（Ｃ）は、本発明の第７の実施形態に係るアンテナ装置の無給電素子の外観斜視図である。 Next, an antenna device according to a seventh embodiment of the present invention will be described with reference to the drawings. FIGS. 10A, 10B, and 10C are external perspective views of parasitic elements of the antenna device according to the seventh embodiment of the present invention.
　本実施形態に係るアンテナ装置は、第２の実施形態に係るアンテナ装置に対して、無給電素子４０Ｆ１、４０Ｆ２、４０Ｆ３の形状において異なる。本実施形態に係るアンテナ装置の他の構成は、第２の実施形態に係るアンテナ装置と同様であり、同様の箇所の説明は省略する。 The antenna device according to the present embodiment differs from the antenna device according to the second embodiment in the shapes of the parasitic elements 40F1, 40F2, and 40F3. Other configurations of the antenna device according to the present embodiment are the same as those of the antenna device according to the second embodiment, and description of the same parts is omitted.
　無給電素子４０Ｆ１、４０Ｆ２、４０Ｆ３は、第１電極部４１Ｆ、第２電極部４２Ｆ、および、第３電極部４３Ｆを備える。第１電極部４１Ｆ、第２電極部４２Ｆ、および、第３電極部４３Ｆの接続態様は、第２の実施形態に係る無給電素子４０Ａと同様である。 The parasitic elements 40F1, 40F2, and 40F3 include a first electrode portion 41F, a second electrode portion 42F, and a third electrode portion 43F. The connection mode of the first electrode part 41F, the second electrode part 42F, and the third electrode part 43F is the same as that of the parasitic element 40A according to the second embodiment.
　図１０（Ａ）に示す態様では、屈曲部ＦＸによって、第１電極部４１Ｆにおけるｚ方向に沿った所定長さの部分は、基板の表面に直交する形状となり、基板に近くなる。 In the embodiment shown in FIG. 10A, the bent portion FX causes a portion of the first electrode portion 41F having a predetermined length along the z direction to be perpendicular to the surface of the substrate and close to the substrate.
　図１０（Ｂ）に示すよう態様では、屈曲部ＦＸによって、第３電極部４３Ｆは、基板の表面に直交する形状となり、基板に近くなる。 10B, the third electrode portion 43F has a shape orthogonal to the surface of the substrate and is close to the substrate by the bent portion FX.
　図１０（Ｃ）に示す態様では、屈曲部ＦＸによって、第１電極部４１Ｆにおけるｚ方向に沿った所定長さの部分、第２電極部４２Ｆ、および、第３電極部４３Ｆは、基板の表面に直交する形状となり、基板に近くなる。 In the embodiment shown in FIG. 10C, the bent portion FX causes the portion of the first electrode portion 41F having a predetermined length along the z direction, the second electrode portion 42F, and the third electrode portion 43F to be on the surface of the substrate. The shape is orthogonal to the substrate and is close to the substrate.
　このような構成とすることによって、無給電素子が基板に近くなり、無給電素子と給電素子との容量性結合が大きくなる。したがって、第２の実施形態に係るアンテナ装置と同様に、無給電素子を小型にできる。 By adopting such a configuration, the parasitic element becomes closer to the substrate, and the capacitive coupling between the parasitic element and the feeder element is increased. Therefore, similarly to the antenna device according to the second embodiment, the parasitic element can be reduced in size.
　次に、本発明の第８の実施形態に係るアンテナ装置について、図を参照して説明する。図１１（Ａ）は、本発明の第８の実施形態に係るアンテナ装置の無給電素子の平面図である。図１１（Ｂ）は、比較対象のアンテナ装置の無給電素子の平面図である。 Next, an antenna device according to an eighth embodiment of the present invention will be described with reference to the drawings. FIG. 11A is a plan view of a parasitic element of the antenna device according to the eighth embodiment of the present invention. FIG. 11B is a plan view of the parasitic element of the antenna device to be compared.
　本実施形態に係るアンテナ装置１０Ｇは、第１の実施形態に係るアンテナ装置１０と比較して、無給電素子４０Ｇの形状において異なる。 The antenna device 10G according to the present embodiment differs from the antenna device 10 according to the first embodiment in the shape of the parasitic element 40G.
　無給電素子４０Ｇは、第１電極部４１Ｇ、第２電極部４２Ｇ、および、第３電極部４３Ｇを備える。第１電極部４１Ｇ、第２電極部４２Ｇ、および、第３電極部４３Ｇの接続態様は、第１の実施形態に係る無給電素子４０と同様である。 The parasitic element 40G includes a first electrode part 41G, a second electrode part 42G, and a third electrode part 43G. The connection mode of the first electrode part 41G, the second electrode part 42G, and the third electrode part 43G is the same as that of the parasitic element 40 according to the first embodiment.
　無給電素子４０Ｇは、第１電極部４１Ｇの角にＲ面取り部ＥＲ４１を備える。Ｒ面取り部ＥＲ４１は、第１電極部４１Ｇと第２電極部４２Ｇとが繋がる屈曲形状の外側の角部、および、第１電極部４１Ｇと第３電極部４３Ｇとが繋がる屈曲形状の外側の角部に、それぞれ形成されている。 The parasitic element 40G includes an R chamfered portion ER41 at the corner of the first electrode portion 41G. The R chamfered portion ER41 includes a bent outer corner portion that connects the first electrode portion 41G and the second electrode portion 42G, and a bent outer corner portion that connects the first electrode portion 41G and the third electrode portion 43G. It is formed in each part.
　このような構成とすることによって、図１１（Ａ）に示すように、筐体９０Ｇの角部がＲ面取り形状ＥＲ９０を有する場合、この角部のＲ面取り形状に沿って、無給電素子４０Ｇを近接して配置できる。また、この形状に伴って、第２電極部４２Ｇ、および第３電極部４３Ｇを、第２の実施形態に係るアンテナ装置と同様に短くできる。 By adopting such a configuration, as shown in FIG. 11A, when the corner portion of the housing 90G has an R chamfered shape ER90, the parasitic element 40G is arranged along the R chamfered shape of the corner portion. Can be placed close together. Further, along with this shape, the second electrode part 42G and the third electrode part 43G can be shortened similarly to the antenna device according to the second embodiment.
　一方、図１１（Ｂ）に示すように、第１実施形態の無給電素子４０の形状と基本形状が類似する比較形状の無給電素子４０’では、筐体９０Ｇと無給電素子４０’の第１電極部４１’との間を離間しなければならない。また、この構造により、第２電極部４２’、および第３電極部４３’を短くできない。 On the other hand, as shown in FIG. 11 (B), in the parasitic element 40 ′ having a comparative shape similar in basic shape to the parasitic element 40 of the first embodiment, the first of the casing 90G and the parasitic element 40 ′. It must be separated from the one electrode portion 41 ′. Further, due to this structure, the second electrode portion 42 ′ and the third electrode portion 43 ′ cannot be shortened.
　このように、本実施形態の構成を用いることによって、筐体の形状に応じた小型のアンテナ装置１０Ｇを実現できる。 Thus, by using the configuration of this embodiment, a small antenna device 10G corresponding to the shape of the housing can be realized.
　なお、上述の各実施形態の構成は、適宜組み合わせることができ、これらを組み合わせることによって、無給電素子の小型化が可能である。 In addition, the structure of each above-mentioned embodiment can be combined suitably, and a parasitic element can be reduced in size by combining these.
　また、上述の各実施形態の構成では、給電素子をＬ字型にする態様を示したが、次に示す各形状にすることも可能である。図１２（Ａ）、図１２（Ｂ）、図１２（Ｃ）、図１２（Ｄ）、図１２（Ｅ）は、本発明の実施形態に係る給電素子の形状例を示す図である。図１２（Ａ）－（Ｅ）は、アンテナ装置における給電素子の形成部を含む部分平面図である。 Further, in the configuration of each of the above-described embodiments, the aspect in which the power feeding element is L-shaped has been described, but it is also possible to have the following shapes. FIG. 12A, FIG. 12B, FIG. 12C, FIG. 12D, and FIG. 12E are diagrams showing examples of the shape of the power feeding element according to the embodiment of the present invention. 12A to 12E are partial plan views including a feeding element forming portion in the antenna device.
　図１２（Ａ）に示すアンテナ装置１０Ａでは、給電素子２０Ａは、給電端側電極２１と開放端側電極２２Ａとを備える。開放端側電極２２Ａは、線状電極２２１、２２２、２２３を備える。線状電極２２１、２２３は、ｙ方向に延びる形状であり、線状電極２２２は、ｚ方向に延びる形状である。線状電極２２１、２２３の長さは、線状電極２２２よりも大幅に長い。線状電極２２１の一方端は、給電端側電極２１に接続されており、他方端は、線状電極２２２の一方端に接続されている。線状電極２２２の他方端は、線状電極２２３の一方端に接続されている。すなわち、開放端側電極２２Ａは、折り返し型の電極である。 In the antenna device 10A shown in FIG. 12A, the feeding element 20A includes a feeding end side electrode 21 and an open end side electrode 22A. The open end side electrode 22A includes linear electrodes 221, 222, and 223. The linear electrodes 221 and 223 have a shape extending in the y direction, and the linear electrode 222 has a shape extending in the z direction. The length of the linear electrodes 221 and 223 is significantly longer than that of the linear electrode 222. One end of the linear electrode 221 is connected to the power supply end side electrode 21, and the other end is connected to one end of the linear electrode 222. The other end of the linear electrode 222 is connected to one end of the linear electrode 223. That is, the open end side electrode 22A is a folded electrode.
　図１２（Ｂ）に示すアンテナ装置１０Ｂでは、給電素子２０Ｂは、給電端側電極２１と開放端側電極２２Ｂを備える。開放端側電極２２Ｂは、ｙ方向に延びる部分とｚ方向に延びる部分とが交互に接続された、所謂ミアンダ形状である。 In the antenna device 10B shown in FIG. 12B, the feeding element 20B includes a feeding end side electrode 21 and an open end side electrode 22B. The open end side electrode 22B has a so-called meander shape in which portions extending in the y direction and portions extending in the z direction are alternately connected.
　図１２（Ｃ）に示すアンテナ装置１０Ｃでは、給電素子２０Ｃは、給電端側電極２１、開放端側電極２２Ｃ、短絡端側電極２３Ｃを備える。給電素子２０Ｃは所謂逆Ｆ型の形状である。 In the antenna device 10C shown in FIG. 12C, the feed element 20C includes a feed end side electrode 21, an open end side electrode 22C, and a short-circuit end side electrode 23C. The feeding element 20C has a so-called inverted F shape.
　図１２（Ｄ）に示すアンテナ装置１０Ｄでは、給電素子２０Ｄは、給電端側電極２１、開放端側電極２２Ｄ、および、チップインダクタ２１０を備える。開放端側電極２２Ｄは、上述の開放端側電極２２と同様に、ｙ方向に延びる形状である。給電端側電極２１は、延びる方向の途中位置に分離部が設けられている。チップインダクタ２１０は、給電端側電極２１における分離部によって離間している部分を接続するように配置されている。 In the antenna device 10D shown in FIG. 12D, the feed element 20D includes a feed end side electrode 21, an open end side electrode 22D, and a chip inductor 210. The open end side electrode 22 </ b> D has a shape extending in the y direction, similar to the open end side electrode 22 described above. The power supply end electrode 21 is provided with a separating portion at an intermediate position in the extending direction. The chip inductor 210 is disposed so as to connect portions separated by the separation portion in the power supply end side electrode 21.
　図１２（Ｅ）に示すアンテナ装置１０Ｅでは、給電素子２０Ｅは、給電端側電極２１、および、チップインダクタ２１０を備える。すなわち、給電素子２０Ｅは、給電素子２０Ｄに対して、開放端側電極２２Ｄを省略した形状である。 In the antenna device 10E shown in FIG. 12E, the feed element 20E includes the feed end side electrode 21 and the chip inductor 210. That is, the feed element 20E has a shape in which the open end side electrode 22D is omitted from the feed element 20D.
　給電素子がこれらの構造であっても、上述の作用効果を実現できる。 Even if the feed element has these structures, the above-described effects can be realized.
１０、１０Ａ、１０Ｂ、１０Ｃ、１０Ｄ、１０Ｅ、１０Ｇ：アンテナ装置
２０、２０Ａ、２０Ｂ、２０Ｃ、２０Ｄ、２０Ｅ：給電素子
２１：給電端側電極
２２、２２Ａ、２２Ｂ、２２Ｃ、２２Ｄ：開放端側電極
２３Ｃ：短絡端側電極
３０：グランド電極
４０、４０Ａ、４０Ｂ、４０Ｃ、４０Ｄ、４０Ｅ、４０Ｆ１、４０Ｆ２、４０Ｆ３、４０Ｇ：無給電素子
４１、４１Ａ、４１Ｂ、４１Ｃ、４１Ｄ、４１Ｅ、４１Ｆ、４１Ｇ：第１電極部
４２、４２Ａ、４２Ｂ、４２Ｃ、４２Ｄ、４２Ｅ、４２Ｆ、４２Ｇ：第２電極部
４３、４３Ａ、４３Ｂ、４３Ｃ、４３Ｄ、４３Ｅ、４３Ｆ、４３Ｇ：第３電極部
９０、９０Ｇ：筐体
２２１、２２２、２２３：線状電極
３００：基板
４２０、４３０：電極非形成部
４５２、４５３：実装型インダクタ
４４２Ｂ、４４２Ｃ、４４３Ｂ、４４３Ｃ：スリット
４４２１Ｃ、４４２２Ｃ、４４３１Ｃ、４４３２Ｃ：電極非形成部 10, 10A, 10B, 10C, 10D, 10E, 10G: Antenna devices 20, 20A, 20B, 20C, 20D, 20E: Feeding element 21: Feeding end side electrode 22, 22A, 22B, 22C, 22D: Open end side electrode 23C: Short-circuit end side electrode 30: Ground electrodes 40, 40A, 40B, 40C, 40D, 40E, 40F1, 40F2, 40F3, 40G: Parasitic elements 41, 41A, 41B, 41C, 41D, 41E, 41F, 41G: No. 1 electrode part 42, 42A, 42B, 42C, 42D, 42E, 42F, 42G: 2nd electrode part 43, 43A, 43B, 43C, 43D, 43E, 43F, 43G: 3rd electrode part 90, 90G: Housing 221 222, 223: linear electrode 300: substrate 420, 430: electrode non-forming portion 452, 453: mounting inductor 442B 442C, 443B, 443C: slits 4421C, 4422C, 4431C, 4432C: nonconductive portion

Claims (8)

  1. 　第１方向の長さが送受波対象の高周波信号の波長の略１／４以下である基板と、
    　該基板の表面に形成されたグランド電極と、
    　前記基板の表面における前記グランド電極の非形成部に形成され、給電点に接続された給電素子と、
    　前記基板の表面に直交する第２方向に前記表面から間隔を空けて配置され、前記給電素子に容量結合する無給電素子と、を備え、
    　前記無給電素子は、
    　前記第１方向に延びる形状の第１電極部と、
    　前記第１電極部の前記第１方向の第１端に接続され、前記第２方向に延びる形状の第２電極部と、
    　前記第１電極部の前記第１方向の第２端に接続され、前記第２方向に延びる形状の第３電極部と、
    　を備える、
    　アンテナ装置。     A substrate whose length in the first direction is approximately ¼ or less of the wavelength of the high-frequency signal to be transmitted and received;
    A ground electrode formed on the surface of the substrate;
    A feeding element formed in a non-formation portion of the ground electrode on the surface of the substrate and connected to a feeding point;
    A parasitic element disposed at a distance from the surface in a second direction orthogonal to the surface of the substrate and capacitively coupled to the feeder element,
    The parasitic element is
    A first electrode portion having a shape extending in the first direction;
    A second electrode portion connected to a first end of the first electrode portion in the first direction and extending in the second direction;
    A third electrode portion connected to the second end of the first electrode portion in the first direction and extending in the second direction;
    Comprising
    Antenna device.
  2. 　前記第１電極部の幅は、前記第２電極部の幅および前記第３電極部の幅よりも大きい、
    　請求項１に記載のアンテナ装置。     The width of the first electrode part is larger than the width of the second electrode part and the width of the third electrode part,
    The antenna device according to claim 1.
  3. 　前記第１電極部と前記第２電極部との接続部、および、前記第１電極部と前記第３電極部との接続部に設けられた電極非形成部からなるスリットを備える、
    　請求項１または請求項２に記載のアンテナ装置。     A slit composed of a connecting portion between the first electrode portion and the second electrode portion, and an electrode non-forming portion provided at a connecting portion between the first electrode portion and the third electrode portion;
    The antenna device according to claim 1 or 2.
  4. 　前記スリットは、延びる方向の途中で屈曲する形状である、
    　請求項３に記載のアンテナ装置。     The slit is a shape that bends in the middle of the extending direction.
    The antenna device according to claim 3.
  5. 　前記第２電極部および前記第３電極部は、ミアンダ形状である、
    　請求項１乃至請求項４のいずれかに記載のアンテナ装置。     The second electrode part and the third electrode part have a meander shape.
    The antenna device according to any one of claims 1 to 4.
  6. 　前記第２電極部および前記第３電極部は、延びる方向の途中位置に電極非形成部を有し、
    　該電極非形成部によって離間される電極同士は、実装型インダクタによって接続されている、
    　請求項１乃至請求項５のいずれかに記載のアンテナ装置。     The second electrode portion and the third electrode portion have an electrode non-forming portion at a midway position in the extending direction,
    The electrodes separated by the electrode non-forming part are connected by a mounting inductor,
    The antenna device according to any one of claims 1 to 5.
  7. 　前記無給電素子は、前記基板側に屈曲する屈曲部を有する、
    　請求項１乃至請求項６のいずれかに記載のアンテナ装置。     The parasitic element has a bent portion that is bent toward the substrate.
    The antenna device according to any one of claims 1 to 6.
  8. 　前記第１電極部における前記第２電極部への接続部と前記第３電極部への接続部との間の長さは、高周波信号の波長の略１／１０から略１／４である、
    　請求項１乃至請求項７のいずれかに記載のアンテナ装置。     The length between the connection portion to the second electrode portion and the connection portion to the third electrode portion in the first electrode portion is approximately 1/10 to approximately 1/4 of the wavelength of the high-frequency signal.
    The antenna device according to claim 1.
PCT/JP2017/029866 2016-08-25 2017-08-22 Antenna device WO2018038079A1 (en)

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