JP2008160681A - Antenna apparatus and wireless unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-sized antenna apparatus and a wireless unit with broadband characteristics. <P>SOLUTION: A notch 2 is formed at the side A of a conductor ground plate 1, and a radiation conductor plate 4 is provided at a position symmetric to the notch 2 with the side A as a symmetry axis. An area of the notch 2 is made larger than that of the radiation conductor plate 4, thereby shifting a bottom operating frequency to a low frequency side. Thus, in comparison with a false self-assistant antenna having an equal bottom operating frequency, the radiation conductor plate 4 of the antenna apparatus can be made smaller and the antenna apparatus can be made small in size. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an antenna device and a radio device.

  In recent portable wireless devices such as mobile phones, game machines with built-in wireless devices, and notebook computers with built-in wireless devices, various wireless systems are mounted on one device, and devices capable of comfortable wireless communication anytime and anywhere are provided.

  Generally, the radio frequency assigned to a radio system differs for each radio system. Therefore, a portable wireless device that supports a plurality of wireless systems needs a plurality of antennas that operate in accordance with the radio frequency assigned to each wireless system. This is because the antenna supports only one radio frequency.

  However, when an antenna has a wideband characteristic, one antenna operates in accordance with a radio frequency assigned to a plurality of radio systems. Therefore, when an antenna having broadband characteristics is used, the number of antennas necessary for the portable wireless device can be reduced, and the portable wireless device can be reduced in size.

  As an antenna having a wide band characteristic, for example, a pseudo self-complementary antenna composed of a monopole antenna and a notch is known (for example, see Non-Patent Document 1).

The pseudo self-complementary antenna described in Non-Patent Document 1 is thin because the structure is flat. Further, the pseudo self-complementary antenna has an advantage that the design is easy because the monopole and the cut need only have the same symmetrical shape.
Pu Xu, K.K. Fujimoto, and Shimming Lin, “Performance of quasi-self-complementary antenna using a monopole and a slot,” Proc. of 2002 AP-S and USNC / URSI symposium, pp. 464-467, 2002, USA.

  However, the invention described in Non-Patent Document 1 described above has a problem that a monopole antenna and a cut are necessary and the structure is large. A plurality of antennas are used in a MIMO (Multiple Input Multiple Output) wireless system that realizes high-speed and large-capacity communication. When this pseudo self-complementary antenna is applied to a MIMO radio system, since the single structure is large, it is necessary to increase the distance between the antennas in order to reduce the coupling between the antennas. That is, there is a problem that the entire antenna becomes large.

  Furthermore, the center operating frequency of the pseudo self-complementary antenna depends on the peripheral length of the monopole antenna and the peripheral length of the cut. Also, since the shape of the notch and the monopole antenna are symmetrically the same, when trying to obtain a pseudo self-complementary antenna that operates at a certain frequency, both the size of the monopole antenna and the notch must be changed simultaneously. Therefore, there is a problem that it is difficult to miniaturize the antenna.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a small antenna device and a wireless device having wideband characteristics.

  In order to achieve the above object, an antenna device according to the present invention includes a conductor ground plane in which a cut is formed on one side, and a radiating conductor plate disposed on the opposite side of the cut across the one side and in proximity to the cut. And a first feeding point that feeds power to the radiation conductor plate and is arranged at the first end of the one side where the cut is formed, and the second end of the one side where the cut is formed An open end is formed between the radiating conductor plate and the radiating conductor plate to electrically separate them, and the area of the cut is larger than the area of the radiating conductor plate.

  In addition, the antenna device of the present invention includes a conductor ground plate in which a plurality of cuts are formed on one side, and a plurality of radiation conductors arranged on the opposite side of the plurality of cuts across the one side and adjacent to the cuts. A plate and a plurality of feed points that are arranged at each of the first ends of the one side where the cuts are formed and feed power to the plurality of radiation conductor plates, and each cut of the one side is formed. An open end that electrically separates the two is formed between the second end portion formed and the radiation conductor plate disposed in proximity to the notch, and the area of the notch is a radiation conductor disposed in proximity to the notch. It is characterized by being larger than the area of the plate.

  In addition, a wireless device according to the present invention includes the antenna device described above.

  According to the present invention, it is possible to provide a small antenna device and a wireless device having broadband characteristics.

  Embodiments of the present invention will be described below with reference to the drawings.

  The antenna device according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram illustrating the configuration of the antenna device according to the present embodiment.

  The antenna device shown in FIG. 1 includes a conductor ground plate 1 in which a substantially rectangular cut 2 is formed, a feed point 3 disposed at one end of the conductor ground plate 1 in which the cut 2 is formed, and one end via the feed point 3. And a radiating conductor plate 4 connected to the conductor ground plane 1.

  The conductor ground plate 1 is a thin plate made of a highly conductive metal such as copper, silver, or gold. The thickness may be sufficiently thin with respect to the center operating frequency of the antenna device and may be about 1 / 50th to 1000th of the wavelength of the center operating frequency. A substantially rectangular cut 2 having a width w and a depth d is formed on the side A of the conductor ground plane 1.

  Here, the side where the feeding point 3 of the side A divided by the notch 2 is arranged is called side A1, and the side where the feeding point 3 is not arranged is called side A2. Further, an area w × d of a portion surrounded by a straight line including the side A (hereinafter referred to as an axis of symmetry) and each side of the cut 2 is referred to as an area of the cut 2.

  Next, the radiating conductor plate 4 is a thin plate made of a highly conductive metal like the conductor ground plate 1, and has a substantially rectangular shape having a width w and a height h (0 <h <d). . The side B in the width direction of the radiating conductor plate 4 is between the side A1 and the side A2 of the conductor ground plate 1, and one end of the side B is connected to one end of the side A1 of the conductor ground plate 1 through the feeding point 3. Yes. That is, the radiation conductor plate 4 is disposed on the opposite side of the notch 2 across the axis of symmetry and in proximity to the notch 2.

  Further, the other end of the side B of the radiating conductor plate 4 and the one end of the side A2 of the conductor ground plate 1 have a shape in which corners are dropped. Thereby, a gap exists between the other end of the side B of the radiating conductor plate 4 and one end of the side A2 of the conductor ground plate 1, and this gap is referred to as an open end 5. Details of the feeding point 3 and the open end 5 will be described later.

  The notch 2 and the radiating conductor plate 4 are disposed at symmetrical positions around the symmetry axis. However, the area (w × h) of the radiation conductor plate 4 is smaller than the area (w × d) of the notch 2.

  Next, the feeding point 3 will be described in detail with reference to FIG. The feed point 3 according to the present embodiment may be a structure that gives a potential difference between the radiating conductor plate 4 and the conductor ground plate 1 and may be realized by any feeding method such as coaxial feeding or microstrip feeding.

  FIG. 2 is a diagram showing the structure of the feeding point 3 when the coaxial feeding method is used. As shown in FIG. 2, a minute gap exists between the conductor ground plane 1 and the radiation conductor plate 4. The coaxial line 6 has an outer conductor 6-1 and an inner conductor 6-2, the outer conductor 6-1 of the coaxial line 6 is grounded to the conductor ground plane 1, and the inner conductor 6-2 of the coaxial line 6 radiates. Connect to conductor plate 4. Thereby, the conductor ground plane 1 and the radiation conductor board 4 are connected via the feeding point 3.

  Next, the configuration of the open end 5 will be described with reference to FIG. The open end 5 refers to a minute gap between the conductor ground plane 1 and the radiation conductor plate 4. This gap need only be 1/10 wavelength or less of the center operating frequency.

  Next, the principle of miniaturization of the antenna device according to the present embodiment will be described with reference to FIGS. 1 and 4 to 7.

  The current input from the feeding point 3 flows along the notches 2 and the sides of the radiation conductor plate 4. Electromagnetic waves are radiated from the notch 2 and the radiation conductor plate 4 by the current flowing through the sides. Here, the electromagnetic wave radiation from the notch 2 that contributes to the miniaturization of the antenna device will be described in detail.

  The current input from the feeding point 3 flows along the side of the cut 2, is reflected by the open end 5, and flows again along the side of the cut 2. Hereinafter, a current flowing from the feeding point 3 toward the open end 5 is referred to as an input current, and a current reflected by the open end 5 and flowing toward the feed point 3 is referred to as a reflected current. When this reflected current is large, the reflected current returns from the feeding point to the coaxial line. Since the returned reflected current is not radiated, the radiated electromagnetic wave becomes small.

  Here, a case where the input current is a high frequency will be described with reference to FIG. FIG. 4 is a diagram illustrating an example of the amplitude of the input current.

  When the input current is a high frequency, the input current near the feeding point 3 is the largest among the sides of the notch 2, and the electromagnetic wave is radiated strongly near the feeding point 3. When electromagnetic waves are radiated in the vicinity of the feeding point 3, the input current decreases, and the input current flowing in the vicinity of the open end 5 decreases. Accordingly, the reflected current reflected by the open end 5 is also reduced. Thus, when the input current is a high frequency, the reflected current is small, so that electromagnetic waves are radiated from the cut 2.

  Next, a case where the input current has a low frequency will be described with reference to FIG. FIG. 5 is a diagram illustrating an example of the amplitude of the input current.

  When the input current has a low frequency, the wavelength is long. Therefore, if the input current near the feeding point 3 is large, the input current near the open end 5 also increases. Therefore, the reflected current reflected by the open end 5 is also increased. That is, it becomes difficult for electromagnetic waves to be radiated from the notch 2.

  Here, the input current has a high frequency means that a quarter wavelength of the input current wavelength is shorter than the length (2d + w) of the side of the notch 2, and the low frequency means that the input current A quarter wavelength is longer than the length of the side of the cut 2 (2d + w).

  That is, the frequency band in which the antenna apparatus of this embodiment operates depends on the length of the side of the cut 2. When the length of the side of the cut 2 is shortened, the operating frequency band is shifted to a high frequency. Conversely, when the length of the side of the notch 2 is increased, the operating frequency band is shifted to a low frequency.

  This will be described with reference to FIGS. FIG. 6 is a diagram showing an antenna device in which the perimeters of the notch 2 and the radiating conductor plate 4 are different, and FIG. 7 is a diagram showing an operating frequency band of the antenna device of FIGS. 6 (a) to 6 (c).

  The antenna device shown in FIGS. 6A to 6C has a length (hereinafter referred to as “the length of the perimeter 2 (2w + 2d) of the notch 2 including the side B of the radiation conductor plate 3) and the circumference (2w + 2h) of the radiation conductor plate 4”. , The sum of the peripheral lengths of the radiation portions) is constant (about a half wavelength of the center operating frequency), and the depth d of the notch 2 and the length 4 of the radiation conductor plate 4 are different values. Here, a value (hd) obtained by subtracting the depth d of the notch 2 from the height h of the radiation conductor plate 4 is referred to as an offset.

  FIG. 6A is a diagram showing the antenna device when the height h of the radiating conductor plate 4 is longer than the depth d of the notch 2 (hd> 0). At this time, the offset of the antenna device is assumed to be positive. FIG. 6B is a diagram showing the antenna device when the height h of the radiating conductor plate 4 is equal to the depth d of the notch 2 (h−d = 0). At this time, the antenna device is assumed to have no offset. Note that the antenna device shown in FIG. 2B is generally called a pseudo self-complementary antenna. FIG. 7C is a diagram showing the antenna device when the height h of the radiating conductor plate 4 is shorter than the depth d of the cut 2 (hd <0). At this time, the offset of the antenna device is assumed to be negative. The antenna device shown in FIG. 3C is the antenna device according to this embodiment.

  FIG. 7 is a graph showing an operating frequency band when the offset of the antenna device shown in FIGS. 6A to 6C is changed by 2.5 mm in a range of 5 to −7.5 mm. FIG. 7 shows a frequency range where the reflection characteristic S11 of the antenna device is S11 ≦ −10 dB or less. This reflection characteristic S11 is the ratio of the input current that has been transmitted through the coaxial line and input from the feeding point to the reflected current that has returned from the feeding point to the coaxial line.

  A general pseudo self-complementary antenna without offset (see FIG. 6B) has a minimum operating frequency of about 2 GHz. Since the maximum operating frequency exceeds 5 GHz, it is not shown here. As described above, the operating frequency band of a general pseudo self-complementary antenna is very wide.

  In the antenna device (see FIG. 6A) in which the offset is plus (hd> 0), the minimum operating frequency is higher than that in the case where there is no offset. This is presumably because the length of the side of the cut 2 is shorter than when there is no offset. On the other hand, the maximum operating frequency is not shown because it exceeds 5 GHz as in the case of no offset. When the offset is made positive in this way, the operating frequency band becomes very wide as in the case where there is no offset, but the minimum operating frequency shifts to the high frequency side.

  Next, in the antenna device (see FIG. 6C) in which the offset is minus (hd <0), the minimum operating frequency is lower than that in the case where there is no offset. This is presumably because the length of the side of the cut 2 is longer than when there is no offset. When the offset is −5.0 mm, the minimum operating frequency is about 1.7 GHz, the maximum operating frequency is about 2.5 GHz, and the center operating frequency is about 2.1 GHz, so the specific band is about 38 percent ((2.5 -1.7) ÷ 2.1 × 100 = 38%). When the offset is −7.5 mm, the minimum operating frequency is about 1.6 GHz, the maximum operating frequency is about 2 GHz, and the center frequency is about 1.8 GHz, so the specific band is about 22% ((2-1. 6) ÷ 1.8 × 100 = 22%). An antenna device having a specific band exceeding 20 percent is generally a wide band. Therefore, even when the offset is negative (see FIG. 6C), it can be said that the antenna apparatus is sufficiently wide.

  Thus, even if the offset is changed, the antenna device maintains the wideband characteristics. Further, when the side length of the notch 2 is shortened, the minimum operating frequency is shifted to the high frequency side, and when the side length is lengthened, the minimum operating frequency is shifted to the low frequency side.

  When the antenna device is miniaturized, the minimum operating frequency shifts to the high frequency side. On the other hand, when the offset of the antenna device is negative, the lowest operating frequency is shifted to the low frequency side compared to an antenna device without an offset. Therefore, if the offset of the antenna device is set to be negative and the antenna device is downsized, the same minimum operating frequency as that of the antenna device without offset can be obtained. In other words, in the case of antenna devices having the same minimum operating frequency, an antenna device having a negative offset is smaller than an antenna device having no offset.

  Then, the example at the time of mounting the antenna apparatus which concerns on a present Example on a portable radio using FIG. 8 is shown. The portable wireless device shown in FIG. 8 includes a housing 7, a substrate 8 arranged inside the housing 7, the antenna device shown in FIG. 1, a wireless circuit IC (not shown), a speaker (not shown), and the like. Yes. The configuration and operation of the antenna device are the same as those of the antenna device shown in FIG. The ground plane 1 of the substrate 8 may be substituted for the conductor ground plane 1 of the antenna device. Although not shown, a radio circuit IC, a battery, a liquid crystal screen, an input key, a speaker, and the like are arranged on the substrate 8 to perform radio communication such as a call and data communication.

  Next, an example in which the antenna device according to the present embodiment is mounted on a wireless card will be described with reference to FIG. The wireless card shown in FIG. 9 includes a housing 9, a substrate 10, the antenna device shown in FIG. 1, a wireless circuit IC (not shown), and the like. The configuration and operation of the antenna device are the same as those of the antenna device shown in FIG. The ground plane 1 of the substrate 10 may be substituted for the conductor ground plane 1 of the antenna device.

  The wireless card shown in FIG. 9 is inserted into a card slot of the notebook computer 11, for example. The signal output from the notebook personal computer 11 is input to a wireless circuit IC (not shown) of the wireless card, subjected to signal processing, and then transmitted via the antenna device. The signal received via the antenna device is input to a radio circuit IC (not shown), subjected to signal processing, and then input to the notebook computer 11.

  As described above, according to the first embodiment, the depth d of the rectangular notch 2 provided in the conductor ground plane 1 of the antenna device is longer than the height h of the radiating conductor plate 4, thereby providing wideband characteristics. A small antenna device can be provided.

  Next, a second embodiment of the present invention will be described with reference to FIG. The antenna device according to the second embodiment is substantially the same as the configuration and operation of the antenna device shown in FIG. 1 except for the shapes of the notch 12 and the radiating conductor plate 13. .

  The notch 12 has a combination of a rectangle having a width w and a depth h ′ (h ′ <d) and a semicircle having a radius of 0.8 w. The radiating conductor plate 13 has a shape in which a rectangle having a width w and a height h ′ (h ′ <h) and a circle having a radius w are combined so as to partially overlap each other. Here, the shape of the cut 12 and the radiation conductor plate 13 is a combination of a rectangle and a semicircle (or a circle), but the shape of the cut 12 and the radiation conductor plate 13 is separated from the symmetry axis by a certain distance h ′. However, the shape is not limited to the above-described shape.

  As shown in FIG. 1, when the depth d of the notch 2 is longer than the height h of the radiating conductor plate 4, the broadband constant impedance operation of the pseudo self-complementary antenna changes. However, if the notch 12 and the shape of the radiating conductor plate 13 are symmetric within a range h ′ away from the symmetry axis as shown in FIG. 10, the change in the constant impedance operation can be minimized.

  This is because, as shown in FIG. 4, when the input signal has a high frequency, electromagnetic waves are mainly emitted from the vicinity of the feed point 3 of the cut 12. If the notch 12 and the radiating conductor plate 13 are symmetrical in the vicinity of the feeding point 3, that is, within a certain range h ′ from the symmetry axis, the structure of the antenna device has a strong high-frequency current (near the feeding point 3). This is because the structure of the pseudo self-complementary antenna is almost the same.

  As described above, according to the second embodiment, the same effects as those of the first embodiment can be obtained, and the shapes of the notch 12 and the radiation conductor plate 13 can be deformed. To do.

  Next, a third embodiment will be described with reference to FIG. FIG. 11 is a diagram illustrating the antenna device according to the present embodiment.

  The antenna device shown in FIG. 11 has substantially the same configuration and operation as the antenna device shown in FIG. 1 except that the conductor ground plane 14 and the radiating conductor plate 15 are made of mesh conductors. Is omitted.

  The conductor ground plate 14 and the radiation conductor plate 15 shown in FIG. 11 are made of mesh conductors. As the mesh constituting the conductor ground plate 14 and the radiation conductor plate 15 is finer, the characteristics of the conductor ground plate 14 and the radiation conductor plate 15 are not significantly changed from the characteristics of the plate-like conductor ground plate 1 and the radiation conductor plate 4. The size of the mesh may be about 1/10 wavelength or less of the maximum operating frequency.

  As described above, according to the third embodiment, the same effect as that of the first embodiment can be obtained, and the antenna device can be reduced in weight by configuring the conductor base plate 14 and the radiation conductor plate 15 with mesh conductors. Moreover, even when it receives wind, it is difficult to fall down, and wind resistance characteristics can be improved. Furthermore, a feed line (not shown) of the antenna device can be connected to a wireless circuit through a hole in the mesh, and the degree of freedom of component layout is improved.

  In this embodiment, the case where the antenna device shown in FIG. 1 is used has been described. However, the same effect can be obtained by using the antenna device shown in FIG.

  Next, a third embodiment of the present invention will be described with reference to FIG. In the antenna device according to the present embodiment, two antenna devices shown in FIG. 1 are arranged next to each other, but the operation of each antenna device is the same as the operation of the antenna device shown in FIG. .

  The antenna device shown in FIG. 12A includes a conductor ground plane 16, cuts 2-1 and 2-2 provided on the conductor ground plane 16, and radiation connected to the conductor ground plane 16 via a feeding point 3-1. A conductor plate 4-1 and a radiation conductor plate 4-2 connected to the conductor ground plate 16 via a feeding point 3-2 are provided.

  The radiation conductor plate 4-1 is disposed on the opposite side of the notch 2-1 across the axis of symmetry and close to the notch 2-1. Similarly, the radiation conductor plate 4-2 is also arranged on the opposite side of the notch 2-2 across the axis of symmetry and close to the notch 2-2. The detailed configuration of each part is the same as that of the antenna device shown in FIG.

  By increasing the area of the notch 2-1 from the radiating conductor plate 4-1, and similarly increasing the area of the notch 2-2 from the radiating conductor plate 4-2, the area between the radiating conductor plates 4-1 and 4-2 is increased. The mutual coupling can be reduced.

Hereinafter, the principle of reducing this mutual coupling will be described.
First, the gap between the conductor ground plate 16 and the radiation conductor plate 4-1 is referred to as an open end 5-1, and the gap between the conductor ground plate 16 and the radiation conductor plate 4-2 is referred to as an open end 5-2. Further, the distance from the feeding point 3-1 to the open end 5-2 is the distance L1, the distance from the feeding point 3-1 to the feeding point 3-2 is L2, and the distance from the open end 5-1 to the feeding point 3-2. The distance is referred to as L3.

  FIG. 12B shows a conventional self-complementary antenna in which two conventional self-complementary antennas having the notches 2′-1, 2′-3 and the radiating conductor plates 4′-1, 4′-2 having almost the same area are arranged. An antenna device is shown.

  Here, the gap between the conductor ground plane 17 and the radiating conductor plate 4′-1 is referred to as an open end 5′-1, and the gap between the radiating conductor plate 17 and the radiating conductor plate 4′-2 is referred to as the open end 5′−. 2 is called. Further, the distance from the feeding point 3′-1 to the open end 5′-2 is a distance L′ 1, the distance from the feeding point 3′-1 to the feeding point 3′-2 is L′ 2, and the open end 5′−. The distance from 1 to the feeding point 3′-2 is referred to as L′ 3.

  Note that the minimum operating frequencies of the antenna device (a) according to the present embodiment shown in FIG. 12A and the conventional antenna device (b) shown in FIG. 12B are equal to each other.

  Here, the distance L1 from the feeding point 3-1 to the open end 5-2 of the antenna device (FIG. 12A) according to the present embodiment and the feeding point 3 of the conventional antenna device (FIG. 12B). It is assumed that the distance L′ 1 from “−1” to the open end 5′−2 is equal (L1 = L′ 1).

  At this time, since the antenna device according to the present embodiment is smaller than the conventional antenna device as described above, the distance L2 from the feeding point 3-1 to the feeding point 3-2 is set as the feeding point 3′−. 1 can be larger than the distance L′ 2 from the feeding point 3′-2 (L2> L′ 2). That is, since the feeding points 3-1 and 3-2 can be arranged apart from each other, the influence of the feeding points 3-1 and 3-2 can be suppressed, and the mutual connection between the radiation conductor plates 4-1 and 4-2 can be suppressed. Bonding can be reduced.

  Similarly, the distance L2-L3 from the open end 5-1 to the feed point 3-2 is larger than the distance L2′-L′3 from the open end 5′-1 to the feed point 3′-2 (L2-L3). > L2'-L'3). Since the portion of the open end 5-1 is a point where the structure of the antenna device is discontinuous, it affects the broadband operation of the radiation conductor plate 4-2. However, like the antenna device according to the present embodiment, the influence of the open end 5-1 on the broadband operation is reduced by increasing the distance L2-L3 from the open end 5-1 to the feeding point 3-2. be able to.

  As described above, according to the fourth embodiment, the same effect as in the first embodiment can be obtained, and two cuts and two radiating conductor plates each having a cut area larger than that of the radiating conductor plate can be arranged. Therefore, the space between the radiation conductor plates 4-1 and 4-2 can be widened, the mutual coupling between the radiation conductor plates 4-1 and 4-2 is reduced, and the influence on the broadband operation is reduced. Antenna performance and wireless performance can be improved.

  In this embodiment, the case where the antenna device shown in FIG. 1 is used has been described. However, the same effect can be obtained by using the antenna device shown in FIGS. Further, the number of the cuts 2 and the radiating conductor plates 4 is not limited to two, and n pieces may be arranged.

  In addition, this invention is not limited to the said Example as it is, A component can be deform | transformed and embodied in the range which does not deviate from the summary in an implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiments. Furthermore, constituent elements over different embodiments may be appropriately combined.

The figure which shows the structure of the antenna apparatus which concerns on 1st Example of this invention. The figure which shows the structure of the feed point 3 which concerns on the 1st Example of this invention. The figure which shows the structure of the open end 5 which concerns on the 1st Example of this invention. The figure which shows an example of the amplitude of the input current (high frequency) which flows into the notch 2 which concerns on 1st Example of this invention. The figure which shows an example of the amplitude of the input current (low frequency) which flows into the notch 2 which concerns on 1st Example of this invention. The figure which shows the antenna apparatus from which the perimeter of the notch 2 and the radiation | emission conductor plate 4 differs. The figure which shows the operating frequency band of the antenna apparatus of Fig.6 (a)-(c). The figure which shows the example at the time of mounting the antenna apparatus which concerns on the Example which concerns on 1st Example of this invention in a portable radio | wireless machine. The figure which shows the example at the time of mounting the antenna apparatus which concerns on 1st Example of this invention in the radio | wireless card. The figure which shows the structure of the antenna apparatus which concerns on the 2nd Example of this invention. The figure which shows the structure of the antenna apparatus which concerns on the 3rd Example of this invention. The figure which shows the structure of the antenna apparatus which concerns on the 4th Example of this invention.

Explanation of symbols

1, 14, 16, 17: Conductor ground plane 2, 12: Cut 3 ... Feed point 4, 13, 15 ... Radiation conductor plate 5 ... Open end 6 ... Coaxial line

Claims (6)

A conductor ground plane with cuts on one side;
On the opposite side of the notch across the one side, a radiating conductor plate disposed close to the notch,
A feed point that is disposed at the first end of the one side where the cut is formed and feeds the radiation conductor plate;
Forming an open end that electrically separates the one side of the radiation conductor plate between the second end portion where the cut is formed and the radiation conductor plate;
The area of the cut is larger than the area of the radiation conductor plate.   2. The antenna device according to claim 1, wherein the radiation conductor plate and the notch are symmetrical with respect to the one side as a central axis within a distance L from the one side.   The radiation conductor plate has a substantially rectangular shape having a width w and a height h with a line segment connecting the first end portion and the second end portion as a side, and the notch is formed on the first end portion. The antenna device according to claim 1, wherein the antenna device has a substantially rectangular shape having a width w and a depth d (d> h) in which a line segment connecting a portion and the second end portion is a side.   The antenna device according to any one of claims 1 to 3, wherein the ground conductor plate and the radiation conductor plate are configured by mesh conductors. A conductor ground plate with a plurality of cuts formed on one side;
A plurality of radiation conductor plates arranged on the opposite side of the plurality of cuts across the one side and in close proximity to each of the cuts;
A plurality of feeding points that are arranged at the first ends of the one side where the respective cuts are formed, and feed each of the plurality of radiation conductor plates;
Forming an open end that electrically separates the two sides between the second end portion where each cut is formed and the radiating conductor plate disposed adjacent to the cut;
The antenna device is characterized in that an area of the cut is larger than an area of a radiating conductor plate disposed close to the cut.   A wireless device comprising the antenna device according to any one of claims 1 to 5.

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