WO2008066037A1

WO2008066037A1 - Antenna radiator and antenna

Info

Publication number: WO2008066037A1
Application number: PCT/JP2007/072855
Authority: WO
Inventors: Toru Sakamoto; Yutaka Ozawa
Original assignee: Masprodenkoh Kabushikikaisha
Priority date: 2006-11-27
Filing date: 2007-11-27
Publication date: 2008-06-05
Also published as: JP4950009B2; JP2008160818A

Abstract

Provided is a radiator for a balanced antenna. A thin plate-like conductive material is formed rectangular to form a first radiation element. A pair of first radiation elements are arranged at an interval so that the axial lines in the longitudinal directions accord with each other and are axisymmetrical about a center axis which orthogonally intersects with the axial lines. On the plate surfaces of the first radiation elements, one or a plurality of slits are arranged.

Description

Specification

Antenna radiator and antenna

Technical field

The present invention relates to a balanced antenna radiator and an antenna including the radiator and a reflector.

Background art

[0002] In recent years, terrestrial digital broadcasting, which is spreading in recent years, can receive beautiful images due to its superior characteristics if it can receive radio waves above a certain level. Yagi · Uda type antenna, which is common for antennas, can be easily installed on the veranda or indoors, and it is compact and lightweight so that it does not get in the way, and it has excellent design An antenna was required.

[0003] As an example of such an antenna, for example, an antenna is proposed in which an insulating material and several metal foil antenna elements formed in a thin film shape with a conductive material are attached to the insulator (for example, a patent) Reference 1).

Patent Document 1: Japanese Utility Model Publication No. 57-185207

Disclosure of the invention

Problems to be solved by the invention

[0004] However, since the proposed antenna is obtained by replacing the length and shape of each element determined by the reception wavelength in a general Yagi-Uda type antenna with a metal foil antenna element, an elongated conductor rod is used. In order to obtain the same electrical characteristics as the conventional antenna used, it is necessary to make it as large as the antenna. For example, the antenna can be downsized by using only a radiator and a reflector. I couldn't do it.

[0005] The present invention has been made in view of these problems, and provides an antenna that can be miniaturized without deteriorating electrical characteristics and can be installed not only on a veranda or an antenna column but also indoors. For the purpose.

Means for solving the problem [0006] In order to solve the above problems, the invention of the first aspect is a balanced antenna radiator,

The radiator includes a pair of first radiating elements formed of a thin plate-like conductive material in a rectangular shape, the longitudinal axes thereof being aligned, and spaced apart so as to be axially symmetric about a central axis orthogonal to the axial line. Are arranged by placing

One or a plurality of slits are formed in the plate surface of each of the first radiating elements.

[0007] In the invention of the second aspect, the balanced radiators are arranged apart from each other in the front and rear along the radio wave radiation direction, and the front and rear radiators are connected to each other via a phase adjusting means. An antenna radiator,

The radiator on the rear side is a pair of first radiating elements in which a thin plate-like conductive material is formed in a rectangular shape, and the longitudinal axis thereof coincides with each other and is axially symmetrical about a central axis perpendicular to the axis. It is configured by arranging so as to be separated,

The radiator on the front side is a pair of second radiating elements in which a thin plate-shaped conductive material is formed in a rectangular shape, and the axis of the longitudinal direction thereof coincides with each other, and the axis is symmetrical about the central axis orthogonal to the axis. In addition, the radiator on the rear side is arranged so that the central axes coincide with each other so that the radiating elements are parallel to each other. ,

The front and rear radiators are configured by connecting the front and rear radiating elements positioned in the same direction across the central axis through the phase adjusting means with the base portion close to the central axis as a connection point. Connected,

One or a plurality of slits are formed on the plate surfaces of the first radiating elements constituting the rear-side radiator, respectively.

[0008] Further, the invention of the third aspect is the antenna radiator according to the second aspect, wherein the first radiating element constituting the radiator on the rear side is used as the phase adjusting means at the base portion close to the central axis. The connection point to be connected is formed at a corner located on the innermost front side among the four corners of the first radiating element.

[0009] Next, the invention of the fourth aspect is the antenna radiator according to the third aspect. The dimensions of each part of the radiating element are set as follows.

That is, the first radiating element is formed by forming the slit.

A narrow front conductor on the front side of the slit, a narrow back conductor on the rear side of the slit, and a narrow front conductor and a narrow back side on the side of the slit. Of the connecting narrow conductors that connect the conductors, the line width of the front narrow conductor and the rear narrow conductor is narrower than the wavelength λ 1 of the minimum frequency of the used frequency, approximately 0.106 λ 1. The connection narrow conductor is dimensioned to be able to connect and hold, and the line width of the connection narrow conductor is less than about 0.1 λ 1 of the wavelength λ 1 of the minimum frequency of the use frequency of the first radiating element. This is a dimension that allows the front narrow conductor and the rear narrow conductor to be connected and held.

[0011] Of the four corners of the first radiating element, a specific point at a corner located on the opposite side of the connection point along the longitudinal axis of the first radiating element, and the connection point A route that connects

The dimension of the first path formed by a straight line along the front narrow conductor is from 0.2 λ 2 to 0.4 λ 2 of the wavelength λ 2 of the center frequency of the used frequency, The dimension of the second path formed along the connecting narrow-point conductor on the inner side, the rear narrow-width conductor, the outer narrow-width conductor from the connection point, The minimum frequency of the used frequency is λ 1 (7) 0.2 λ 1 force, et al.

[0012] Further, the invention of the fifth aspect is the antenna radiator according to any one of the first to fourth aspects, wherein at least one of the radiating elements is a modification that prevents deformation of the radiating element. Form prevention means are provided! /.

[0013] On the other hand, an invention of a sixth aspect is an antenna including at least a radiator and a reflector, and the radiator includes the radiator of the antenna according to any one of the first to fifth aspects. It is characterized by this.

[0014] Further, the invention of the seventh aspect is the antenna according to the sixth aspect, wherein the reflector has a longitudinal direction parallel to the polarization direction of the radio wave and a plane orthogonal to the radio wave radiation direction. The first reflector having a rectangular shape arranged so as to be substantially parallel to each other, and both long sides of the first reflector are folded in the radiation direction of the radio wave so that the reflection surface is substantially flat with the radiation direction of the radio wave. It is characterized by a second reflector formed in a row and a force.

[0015] Next, the invention of the eighth aspect provides a shielding property in the antenna according to the seventh aspect. A signal processing circuit that processes signals transmitted and received via the radiator, and the electronic device box is configured using a part of the first reflector. ! / Speaking.

[0016] Further, the invention of a ninth aspect is the antenna according to the eighth aspect, wherein the signal processing circuit is an amplifier circuit that amplifies a received signal from the radiator, The invention according to claim 8 is characterized in that, in the antenna according to the eighth aspect, the signal processing circuit is a mixing circuit that mixes a received signal from the radiator and a signal having a frequency different from that of the received signal. .

[0017] Furthermore, in the eleventh aspect of the invention, in the antenna according to any one of the sixth to tenth aspects, the frequency of the signal that can be transmitted / received by the radiator is in the UHF band. It is characterized by this.

The invention's effect

[0018] In the radiator according to the first aspect, the pair of first radiating elements in which a thin plate-like conductive material is formed in a rectangular shape are arranged so that the longitudinal axes thereof coincide with each other and the center is orthogonal to the axial line. They are configured by being spaced apart so as to be axially symmetric with respect to the axis. In addition, one or a plurality of slits are formed in the plate surface of each first radiating element.

[0019] Therefore, as will be apparent from the experimental results described later, compared with the case where each radiating element is simply formed of a thin plate-shaped conductive material, the frequency characteristics on the low band side are improved, and the broadband of the radiator is improved. Can be achieved. In addition, each radiating element can be easily manufactured by simply punching and forming a thin plate-like conductive material with a die or the like.

[0020] In the radiator according to the second aspect, balanced radiators are arranged apart from each other in the front-rear direction along the radiation direction of the radio wave, and the front and rear radiators are connected to each other via a phase adjusting unit. It is configured by.

[0021] That is, in the radiator according to the second aspect, the radiator on the rear side shares a pair of first radiating elements in which a thin plate-like conductive material is formed in a rectangle with the longitudinal axis thereof aligned. In addition, the radiator on the front side is similarly formed in a rectangular shape with a rectangular shape about the central axis perpendicular to the axis. The pair of second radiating elements are configured so that their longitudinal axes coincide with each other and are spaced apart so as to be axially symmetric with respect to a central axis perpendicular to the axial line.

[0022] And, the radiator on the front side and the radiator on the rear side are arranged so that the respective radiating elements are parallel to each other by aligning the central axes, The front and rear radiating elements positioned in the same direction across the central axis are connected by connecting each other via a phase adjusting means with a base portion close to the central axis as a connection point.

[0023] For this reason, according to the radiator described in the second aspect, as compared with the case where the radiator described in the first aspect is configured by only a pair of radiating elements, the radiator on the rear side is separated. An antenna having the maximum directivity in the arrangement direction of the radiators on the front side can be realized.

[0024] Also in the radiator according to the second aspect, as in the first radiating element according to the first aspect, one or more are provided on the plate surface of the first radiating element constituting the rear-side radiator. The slit is drilled. Therefore, in the radiator described in the second aspect, as in the case described in the first aspect, the frequency on the low frequency side is lower than that in the case where the first radiating element is formed of a thin plate-shaped conductive material having no slit. The characteristics can be improved and the bandwidth of the radiator can be increased.

[0025] Next, in the radiator according to the third aspect, in the first radiating element constituting the rear-side radiator, a connection point formed at the base portion near the central axis and connected to the phase adjusting means. Is formed at the corner located on the innermost front side among the four corners of the first radiating element

For this reason, when considering the path from the connection point to the outer end of the first radiating element, a plurality of paths having different line lengths are formed by the slits formed in the first radiating element. Therefore, the frequency characteristics on the low band side are improved by the plurality of paths, and a radiator having excellent frequency characteristics over a wide band can be realized.

[0027] When the first radiating element is configured in this way, as described in the fourth aspect, the front narrow conductor formed on the front side of the slit in the first radiating element, and The line width of the rear narrow conductor formed on the rear side of the slit is approximately the same as the wavelength λ 1 of the minimum frequency of the used frequency. Set to dimensions that can be held The line width of the connecting narrow conductor formed on the side of the slit in the first radiating element and connecting the front narrow conductor and the rear narrow conductor is the minimum of the operating frequency. It is preferable to set the dimensions so that the front narrow conductor and the rear narrow conductor of the first radiating element narrower than the wavelength λ 1 of about 0.1 λ 1 can be connected and held.

[0028] In this case, of the four corners of the first radiating element, a specific point at a corner located on the opposite side of the connection point along the longitudinal axis of the first radiating element, and the connection point The size of the first path formed by a straight line along the narrow conductor on the front side is 0.2-2 of the center frequency of the center frequency of the used frequency, etc. Similarly, it is a path connecting the above-mentioned connection point and the specific point, and is set along the connecting narrow conductor on the inside, the narrow back conductor on the back side, and the connecting narrow conductor on the outside. The dimension of the second path to be formed should be set to 0 · 2 · 1 of the wavelength λ の of the minimum frequency of the used frequency, and 0.4 λ ら.

That is, if the dimensions of the respective parts of the first radiating element are set in this way, the characteristics of the entire radiator are adjusted by the slit, the first path, and the second path, as is apparent from the experimental results described later. On the other hand, it is possible to improve the frequency characteristic on the low frequency side, and to realize a radiator having a good frequency characteristic over a wide band easily and inexpensively.

[0030] Next, in the radiator according to the fifth aspect, at least one of the radiating elements is provided with a deformation preventing means for preventing deformation of the radiating element. For this reason, by forming the radiating element from a thin plate-shaped conductive material, even if the radiating element alone cannot secure the strength, the radiating element is deformed through the deformation preventing means such as a reinforcing plate. To prevent the problem,

[0031] Therefore, according to the radiator described in the fifth aspect, it is possible to prevent the radiation element from being deformed when the radiator is moved or assembled, and also to prevent deformation after assembly. In addition, the radiation characteristics can be stabilized.

[0032] On the other hand, the invention described in the sixth aspect is an invention related to an antenna including at least a radiator and a reflector, and the radiator is described in any one of the first to fifth aspects described above. A radiator is used.

[0033] Therefore, according to the antenna described in the sixth aspect, it is possible to realize an antenna having good frequency characteristics over a wide band. And in particular, any of the second to fifth aspects as a radiator If the radiator described in is used, an antenna with high gain and sharp directivity can be realized.

[0034] Next, in the antenna according to the seventh aspect, the reflector is arranged such that the direction parallel to the polarization direction of the radio wave is the longitudinal direction and substantially parallel to the plane orthogonal to the radio wave radiation direction. A rectangular first reflector and both long sides of the first reflector are folded in the direction of radio wave radiation, respectively, so that the reflection surface is substantially parallel to the direction of radio wave radiation. Consists of two reflectors and force.

[0035] Therefore, according to the antenna described in the seventh aspect, the dimensions of the reflector that does not deteriorate the electrical characteristics compared to the conventional antenna (specifically, the dimensions in the direction perpendicular to the polarization direction of the radio wave). ) Power S can be shortened.

[0036] In addition, since the size of the reflector can be shortened in this way, it is possible to reduce the thickness of the entire antenna S, easy to handle, and easy to install. An antenna can be provided.

[0037] Next, the antenna according to the eighth aspect includes an electronic device box that houses a signal processing circuit that processes a signal transmitted and received via the radiator, and the box has a first reflection. It is constructed using a part of the vessel.

[0038] For this reason, according to the antenna described in the eighth aspect, it is not necessary to separately provide a box for housing the signal processing circuit as long as the antenna and the signal processing circuit can be integrated. Can be achieved.

[0039] Note that, as described in the ninth aspect, the signal processing circuit stored in the electronic device box includes an amplification circuit that amplifies the received signal from the radiator, and a radiation circuit as described in the tenth aspect. A mixed circuit that mixes a received signal with a frequency different from that of the received signal (for example, a received signal from another antenna) can be given.

[0040] In particular, when a mixing circuit is provided as a signal processing circuit, it is possible to use a single lead-in wire for drawing a received signal from the antenna to the receiving terminal side, thus simplifying the wiring work. .

[0041] Next, as described in the tenth aspect, the antenna of the present invention can receive terrestrial digital broadcasting performed using the UHF band if configured to transmit and receive UHF band signals. A UHF antenna suitable for communication can be realized.

Brief Description of Drawings

FIG. 1 is a schematic perspective view of an antenna according to a first embodiment as viewed obliquely from the front side.

FIG. 2 is a plan view showing the configuration of the radiator.

FIGS. 3A-3F are schematic views showing examples of slits formed in the plate surface of the first radiating element.

FIG. 4 is a graph showing the number of slits formed and the change in gain at 470 MHz.

FIG. 5A-5B is an enlarged view of the first radiating element for explaining the first path and the second path.

[FIG. 6A-6B] It is explanatory drawing which shows arrangement | positioning of each part of an antenna.

FIGS. 7A-7B are side views showing a configuration example of deformation preventing means.

[Fig. 8] Data showing changes in electrical characteristics when the shape of the reflector is changed.

FIG. 9 is a schematic perspective view of the antenna according to the second embodiment viewed from the rear side.

FIG. 10 is a schematic perspective view of the antenna according to the second embodiment viewed from the front side.

FIG. 11 is a schematic cross-sectional view showing a state where the antenna of the second embodiment is housed in a decorative case.

[FIGS. 12A-12D] FIG. 12A is a specific use example of the antenna of the embodiment, FIG. 12A is an antenna mast, FIG. 12B is an indoor, FIG. 12C is an eaves, and FIG. .

Explanation of symbols

[0043] 1 ... Antenna, 3 ... Director, 4b, 42b, 41b ... Rib, 4c, 42c, 41c ... Bent part, 5 ... Slit, 5a ... Inner slit, 5b ... Intermediate slit, 5c ... Outer slit 6 ... Linked narrow conductor, 6a --- Inner linked narrow conductor, 6b ... Intermediate linked narrow conductor, 6c ... Outer linked narrow conductor, 7 ... First path, 8 ··· 2nd path, 10 ······································································ 1st radiator, 11a, lib… radiation element, Flla, Fllb… narrow conductor on the front side, Rlla, Rllb… narrow on the back side Width conductor, 12 ... 2nd radiator, 12a, 12b ... Radiating element, 14 ... Bending part, 15a, 15b ... Phase adjusting means, 16a, 16b ... Feed point, 17 ... Balance line, 18 ··· balanced / unbalanced conversion circuit, 19 ··· unbalanced line, 2 ··· reflector, 21 ··· first reflector, 22a, 22b ··· second reflector, 23 ······· Hole, 30 ... Signal processing circuit, 31 ... Shield case, 32 ... Frame, 33 ... Cover, 35 ... Input terminal, 37 ... Output Pin, 39 ... terminal 咅 ^ 40 ... I spoon ΐ Gesu, 41, 42, 43, 44 ... boss, 45 ... spoon ΐ Gesu body , 46 ··· 匕 ΐCase, 49 ··· Stand mounting means, 50 ··· Antenna mast, 51, 52, 5 3, 54, 55 ... Screw, 60 ... Mast mounting means, 61 ... Indoor stand Aa, Ab ... first radiating element connection point, Ca, Cb ... second radiating element connection point, Ba, Bb ... first radiating element symmetry point, W6a--· Inside connecting narrow conductor line Width, W6b--· Line width of middle connecting narrow conductor, W6c--· · · Line width of outer connecting narrow conductor.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First embodiment]

FIG. 1 is a schematic perspective view of the antenna according to the first embodiment to which the present invention is applied as viewed obliquely from the front side in the radio wave radiation direction, and FIG. 2 is a plan view of a radiator used for the antenna.

As shown in FIG. 1, the antenna 1 of the present embodiment includes a waveguide 3, a radiator 10, and a reflector 20.

As shown in FIGS. 1 and 2, the radiator 10 includes a first radiator 11 and a second radiator 12, and the front side in the direction of radio wave radiation (in the direction of arrow F shown in FIG. When the direction is indicated, the second radiator 12 is arranged in the arrow F unless otherwise specified.) The first radiator 12 is arranged behind the second radiator 12 at a predetermined interval on the rear side. Radiator 11 is arranged.

[0047] The first radiator 11 includes a pair of first radiating elements l la and l ib in which a plate-shaped conductive material that is extremely thin compared to the outer diameter is formed in a rectangular shape, with the longitudinal axes thereof aligned. In addition, it is configured by arranging them so as to be axisymmetric with respect to a central axis that is perpendicular to the axis.

[0048] Further, the second radiator 12 has a pair of second radiating elements 12a and 12b in which a plate-shaped conductive material that is extremely thin compared to the outer diameter shape is formed in a rectangular shape, with the longitudinal axes thereof aligned, It is configured by arranging them so as to be axisymmetric with respect to a central axis orthogonal to the axis.

[0049] Then, the first radiator 11 and the second radiator 12 have the same center axis, and the first radiating elements 11a, l ib and the second radiating elements 12a, 12b are parallel to each other. Are arranged. In each radiator 11, 12, the central axis is the axis along the direction of radio wave radiation. By making the central axes of radiators 11 and 12 coincide, the radiation directions of the radio waves of each radiator 11 and 12 also coincide.

[0050] Of the four corners of the first radiator 11 of the first radiator 11, the inner corner closest to the central axis and the corner on the front side near the second radiator are formed. Between the connected connection points Aa and Ab and the connection points Ca and Cb formed at the base portion (inner side) closest to the central axis in the second radiating elements 12a and 12b of the second radiator 12. Phase adjustment means 15a and 15b for phase adjustment are provided between the connection points Aa and Ca and the connection points Ab and Cb opposite to each other in the arrangement direction of the first radiator 11 and the second radiator 12, respectively. Yes.

Next, in the present embodiment, the first radiating elements l la and l ib constituting the first radiator 11 are formed by punching with a mold or the like simultaneously with the formation of the radiators l la and l ib. A slit 5 is formed. Hereinafter, the slit 5 will be described in detail with reference to FIGS.

FIGS. 3A to 3F are schematic views showing examples of slits formed in the plate surfaces of the first radiating elements 1 la and ib constituting the first radiator 11 of the present embodiment. 3A shows a case where two slits are arranged along the longitudinal direction of the first radiating element 11a, FIG. 3B shows a case where four slits are arranged, and FIG. 3C shows a case where six slits are arranged. 3D, FIG. 3E, and FIG. 3F show examples in which the size or arrangement of the slits is changed and the slits are different. FIG. 4 is a graph showing the relationship between the number of slits of the radiating element and the antenna gain, that is, a graph showing the change in the number of slits and the gain of the antenna 1 at 470 MHz.

[0053] Further, in the following description, to simplify the description of the slit 5, unless otherwise specified, one first radiating element 11a constituting the first radiator 11 will be described, and the first radiating element 1 lb Since the slit is formed so as to be axially symmetric with respect to the central axis, detailed description thereof is omitted.

[0054] As shown in FIG. 2, in the present embodiment, the first radiating element 11a on the rear side constituting the first radiator 11 is respectively formed with slits 5 (in the figure, punched and formed by a mold or the like). The inner slit 5a, the intermediate slit 5b, and the outer slit 5c are divided into six in the longitudinal direction of the first radiating element 11a.

[0055] Here, using FIGS. 3A to 3F and FIG. 4, the minimum frequency (470 MHz) of the frequency used by the antenna 1 using the radiator 10 (in this embodiment, the television signal using the UHF band) is used. ) Paying attention to the gain in the first radiating element 11a with a predetermined external shape, we experimentally confirmed the gain change when slit 5 was not formed and slit 6 was formed, and the first radiating element 11a was The effect of the slit 5 formed in the element 1 la will be explained!

In FIG. 3A to FIG. 3C, the slits 5 are sequentially increased from the connection point Aa side (inner side) to the tip end (outer side) of the first radiating element 1 la with respect to the first radiating element 11a. In Fig. 3A, two slits 5 are formed, in Fig. 3B four slits are shown, and in Fig. 3C six slits 5 forces are formed! /, The

[0057] Then, in such an arrangement condition of the slits 5, the experimental result of examining the change in gain with respect to the difference in the number of slits 5 formed becomes a graph shown by a solid line in FIG.

[0058] According to this graph, when the first radiating element 11a has no slit 5 (slit 5 is 0), the gain of antenna 1 is approximately 4 dB, and the first radiating element l la and l ib have slit 5 The gain of antenna 1 is approximately 4.2 dB, and the first radiating element l la, 1 lb has 5 slits, 6 and 8 antennas. It was experimentally confirmed that the antenna gain was improved by about 0.4 dB by forming a predetermined number of slits 5 at predetermined positions of the first radiator l la and 1 lb.

[0059] As can be seen from this experimental data, the improvement in gain due to the slit 5 can be expected by providing at least four slits 5 as shown in Fig. 4. It can be seen that the effect is the same even if it is provided and if it is provided with one long slit 5 in which a plurality of slits 5 are continuously connected as shown in FIG. 3D.

In addition, as shown in FIG. 3E, the formation position of the slit 5 is directed from the outside in the longitudinal direction of the first radiating element 11a to the inside, contrary to the examples shown in FIGS. 3A, 3B, and 3C. Examining the change in gain when the force is arranged so as to increase in order at equal intervals, it shows a change as shown by the alternate long and short dash line in the graph of FIG. 4, and as shown in FIG. 3F, Examining the change in gain when the positions of the slits 5 are increased from the center of the first radiating elements l la and l ib to the outside and inside in order at equal intervals, the change in gain is shown by a broken line in FIG. It changes like the graph shown.

That is, according to these experimental data, if a predetermined number of slits 5 having a predetermined size are arranged in a predetermined position in the first radiating elements l la and l ib, the first radiating element l The radiator 10 constructed using la and l ib, and hence the antenna 1, is the minimum frequency of the operating frequency band. It can be seen that the gain at can be improved.

Although not shown in FIG. 4, the frequency characteristics on the wide frequency side of the operating frequency are not affected by the formation of the slit 5.

Here, the size of the first radiating element 11a used in the experiment, the number of slits 5, the position of the slits, and the like will be described with reference to FIGS. 3A to 3F, FIGS. 5A, and 5B.

In FIG. 3A, the inner slit 5a and the outer slit from the connection terminal Aa side of the radiating element 11a.

5c is formed. By forming the slit 5 in the first radiating element 11a in this way, the front narrow conductor Fl la is on the front side of the inner slit 5a and the outer slit 5c, and the rear narrow conductor Rl la is on the rear side. It is formed.

[0065] Then, on the lower side in the figure of the innermost inner slit 5a, the inner end of the front narrow conductor Fl la and the inner end of the rear narrow conductor Rla are connected. An inner connecting narrow conductor 6a having a line width W6a is formed, and between the adjacent inner slit 5a and outer slit 5c, the front narrow conductor Fl la and the rear narrow conductor Rl An intermediate connection narrow conductor 6b having a line width W6b for connecting the intermediate portion of la is formed, and between the upper side in the drawing of the outer slit 5c and the tip of the first radiating element 11a. Then, the outer connected narrow conductor 6c-1 having a line width W6c connecting the front end side of the front narrow conductor Flla and the front end side of the rear narrow conductor Rlla is formed.

[0066] Similarly, in FIG. 3B, the inner slit 5a, the two intermediate slits 5b, and the outer slit 5c are connected to the inner link narrow conductor 6a, the three intermediate link narrow conductors 6b, and the outer link narrow. In Fig. 3C, the inner slit 5a, the four intermediate slits 5b, and the outer slit 5c are used to form the inner connecting narrow conductor 6a and the five intermediate connecting narrow conductors 6b. A connected narrow conductor 6c is formed.

In FIG. 3D, one slit 5 is provided so as to be sandwiched between the inner connecting narrow conductor 6a and the outer connecting narrow conductor 6c.

[0068] In the example of the slits shown in Figs. 3A, 3B, and 3C, the line width W6a of the inner connecting narrow conductor 6a and the line width W6b of the intermediate connecting narrow conductor 6b are substantially the same. As a result, depending on the number of slits 5 formed, the line width W6c of the outer connecting narrow conductor has different line widths such as 6c-1, 6c-2, and 6c, respectively. Have Further, in the example of FIG. 3E, the line width W6c of the outer connecting narrow conductor 6c and the line width W6b of the intermediate connecting narrow conductor 6b are formed to have substantially the same line width. As a result, depending on the number of slits 5, the line width W6a of the inner connecting narrow conductor 6a-2 is changed to the line width W6c of the outer connecting narrow conductor 6c and the line width W6b of the intermediate connecting narrow conductor 6b. In the example of FIG. 3F, the line width W6c of the outer connection narrow conductor 6c-3 and the line of the inner connection narrow conductor 6a-3 are larger than the line width W6b of the intermediate connection narrow conductor 6b. Width W6a should be formed wide.

Furthermore, as shown in FIGS. 5A and 5B, the slits 5 are formed in the first radiating element 11a, whereby at least two signal paths are formed in the first radiating element 11a.

[0071] That is, the path is defined by the specific point Ba at the corner located on the opposite side of the connection point Aa along the longitudinal axis of the first radiating element 11a among the four corners of the first radiating element 11a. , The first path 7 formed by a straight line along the front narrow conductor Fl la, the connecting narrow conductor 6a on the inner side from the connection point Aa, the rear side A narrow conductor Rl la is a second path 8 formed along the outer connecting narrow conductor 6c.

[0072] Then, according to the above experimental data, even with the radiation element of the same size formed in a substantially rectangular shape so as to have at least two paths as described above, the outer connection narrow-width guide in FIG. 3A is used. When the line width W6c is larger than the predetermined width as in the case of the body 6c—1, the effect of the slit 5 cannot be obtained, and as shown in FIGS. 3B, 3C, and 3D, the outer connecting narrow conductor 6c— It was found that the effect of slit 5 can be obtained if the line width W6c of 2 and 6c is equal to or smaller than the predetermined dimension.

[0073] Further, according to the above experimental data, as described above, if the slit 5 is disposed at a predetermined position with a predetermined size, the slit 5 is formed from the inside of the first radiating element 11a. Even if they are arranged, they may be arranged inward from the front end side of the first radiating element 11a, or arranged in the vertical direction in the figure from the center of the first radiating element 11a. The effect is recognized

[0074] For this reason, all of the line widths W6a, W6b, and W6c of the inner connecting narrow conductor 6a, the connecting narrow conductor 6b provided in the intermediate portion, and the outer connecting narrow conductor 6c are given force. If it is formed so as to be narrower than the dimension, it can be understood that the slit 5 may be one or plural. In other words, the formation of the slit 5 has to form a route with an appropriate line length.

[0076] In the present embodiment, the force shown in the example in which the slit 5 has a quadrangular shape, and if the width of the connecting narrow conductor is not more than a predetermined dimension as described above, the shape is particularly limited to this shape. Other polygonal shapes may be used instead of things, and a circular shape, an elliptical shape, or the like may be used.

[0077] From the above experimental results, it was found that the dimensions of each part of the first radiating element 11a should be as follows.

[0078] That is, the line widths W6a, W6b, W6c of the inner, intermediate, and outer connected narrow conductors 6 are the first width narrower than approximately 0.1 λ1 of the wavelength λ1 of the minimum frequency of the operating frequency. The size of the radiating element 11a is such that the front narrow conductor Fl la and the rear narrow conductor Rl la can be held together.

[0079] In addition, the dimension of the first path 7 connecting the connection point Aa and the specific point Ba is set to 0.2-2 of the center frequency 2 of the use frequency, and 0.4λ2. Similarly, the size of the second path 8 is set to 0.2 λ 1 force of the wavelength λ の of the minimum frequency of use frequency, and so forth to 0.4 λ 1.

[0080] Further, the line width of the front narrow conductor Fl la and the rear narrow conductor Rl la is a connected narrow width narrower than approximately 0.016 λ 1 of the wavelength λ 1 of the minimum frequency of the use frequency. The conductor 6 is dimensioned so that it can be held together.

[0081] It should be noted that the distance between the first radiator 11 and the second radiator 12 is approximately 0.05 force of the wavelength 2 corresponding to the center frequency at the used frequency, and 0.2 times as much. It only has to be configured.

Here, specific dimensions of the radiator 10 used in the experiment are shown in FIGS. 6A and 6B are explanatory diagrams showing the arrangement of each part of the antenna according to this embodiment.

[0083] In the present embodiment, the first radiator 11 is a rectangular plate having a length Wl l = 150mm and a width WWl = 25mm. The front-rear direction dimension is 15mm, and the left-right direction dimension is 10mm. Six rectangular slits 5 are formed, and the widest line width of the connecting narrow conductor 6 formed thereby is 15 mm. The front narrow conductor Fl 1 a and the rear narrow conductor 5 are formed. The first radiating element 11a whose line width of the width-shaped conductor Rl 1 a is 5 mm, and the first radiating element l ib formed with the same configuration as the first radiating element 11a, have a length Wl = 315 mm at both ends. The length of the first radiating element so that The direction axis lines are aligned, and are arranged so as to be axially symmetric with respect to a central axis perpendicular to the axis line.

[0084] Also, the second radiator 12 includes second radiating elements 12a and 12b having a length W22 = 130mm and a width WW2 = 25mm, and the second radiating elements 12a and 12b so that the length W2 = 275mm at both ends. 12b are arranged so as to be axially symmetric with respect to the central axis orthogonal to the axis line, with the longitudinal axis lines of 12b aligned.

[0085] The distance between the first radiator 11 and the second radiator 12 is L2 = 60 mm.

[0086] The radiator 10 configured as described above has the maximum directivity in the arrangement direction of the first radiator 11 and the second radiator 12, and the lower frequency side of the operating frequency. It has excellent profitability.

[0087] In the present embodiment, each of the radiating elements constituting the first radiator 11 and the second radiator 12 is a force obtained by punching a metal plate having a plate pressure t = 0.2 mm into a predetermined length. The conductive material may be pressed, or it may be thin, or the conductive material may be integrally molded with resin! /, Etc. As long as it is a conductive material, it is not limited to this embodiment. Les.

As described above, according to the radiator 10 of the present embodiment, it has the maximum directivity in the arrangement direction from the radiator 11 on the rear side to the radiator 12 on the front side, has sharp directivity, and broadcasts. It can provide an antenna 1 that can receive radio waves transmitted from the station (UHF TV broadcast radio waves) with high gain.

[0089] Further, by simply punching and forming one or a plurality of slits 5 in the first radiating elements lla and ib constituting the radiator 11 on the rear side, a frequency characteristic on the low frequency side can be obtained. Since the antenna 1 can be widened with improvement, the broadband antenna 1 can be realized easily and at low cost.

[0090] Further, since the slits 5 are formed, a part of the first radiating elements lla and 1 lb is lost, so that the radiator 10 and thus the antenna 1 itself can be reduced in weight.

[0091] Since the antenna 1 using the radiator 10 has a high-performance directional characteristic, it is possible to increase the bandwidth of signals that can be transmitted and received, so that a UHF band television broadcast signal can be transmitted. If configured as a receiving UHF antenna, an antenna suitable for receiving digital terrestrial broadcasting can be provided. [0092] By the way, the radiating elements l la, l ib, 12a, and 12b constituting the radiator 10 are made of a plate-like metal material that is extremely thin compared to the outer diameter. Therefore, it is conceivable that it may be deformed!

[0093] In this case, as a means for preventing deformation of the radiating elements l la, l ib, 12a, 12b, as shown in FIG. 7A, the radiating elements l la, l ib, 12a, 12b (l lb, 12b in the figure) Ribs 42b and 41b are formed along the longitudinal axis of each radiating element lla, 1 lb, 12a, 12b as shown in FIG. 7B (only l lb, 12b is shown) If the bent portions 42c and 41c are slightly bent along the longitudinal axis, the radiating elements l la, l ib, 12a, 12b can be moved and assembled in the radiating elements l la, l ib, 12a, 12b will not be deformed by bending, etc., and deformation after assembly can be prevented, reducing the number of assembly steps and stabilizing characteristics.

7A and 7B are side views showing examples of the deformation preventing means of the present invention. And figure

In FIG. 7A and FIG. 7B, the rib 4b or the bent portion 4c is also formed on the waveguide 3 arranged on the front side of the radiator 10!

Next, the reflector 20 will be described.

As shown in FIG. 1, FIG. 6A, and FIG. 6B, the reflector 20 has a longitudinal direction parallel to the polarization direction of the radio wave (in other words, the polarization plane), and the radio wave radiation direction (in other words, The first reflector 21 having a rectangular shape arranged so as to be substantially parallel to the plane perpendicular to the direction of arrival, and the long side of the first reflector 21 are respectively directed to the radiation direction of the radio wave (in other words, the radiator). By bending it to the 10th side, the second reflectors 22a and 22b, which are formed so that the reflecting surface is substantially parallel to the radiation direction of the radio wave, are combined with force.

The reflector 20 is manufactured by bending a plate having a size of 320 × 100 mm into a U-shaped cross section. In this embodiment, the dimensions of each part are set as follows. ing.

That is, the first reflector 21 has a length W4 = 320 mm and a height H4 = 55 mm, and the second reflector 22 has both long sides of the first radiator 21 at the bent portion 14. In the direction of radiator 10, the width W W4 = 22.5mm (length is 320mm, which is the same dimension as W4).

Yes [0099] The distance between the first radiator 11 and the reflector 20 is L3 = 55 mm.

[0100] Here, the reflector 20 has a U-shaped cross section when the antenna 10 is optimized using the reflector 10 described above and the reflector 20 made of a 320 x 100 mm plate. This is to make the antenna 1 thin by shortening the short dimension of the reflector 20 (the vertical dimension shown in Fig. 6A) while maintaining the good frequency characteristics of 1. This is an experimentally obtained value.

[0101] This experiment will be described below.

[0102] Figure 8 is data representing the change in electrical characteristics when the shape of the reflector 20 is changed.

[0103] Reflector A in FIG. 8 shows that the reflector with dimensions (\\ 4 ^ 14) = 320 100111111 is flat (ie, second reflector 22 is identical to first reflector 21) This is data when it is formed in a state where it is open on both sides so that it is on a flat surface (state before bending) (ie, reflector A = flat plate shape).

The data shown by reflector B in Fig. 8 is a reflection of dimension (W4 X H4) = 320 X 55mm, with height H4 approximately halved with respect to force reflector A, which is flat like reflector A Data when using a reflector (ie, reflector B = height is about half that of reflector A).

In FIG. 8, the data indicated by the reflector C is the reflector 20 of this embodiment, that is, a reflection obtained by bending a plate material having the same dimensions as the reflector A (W4 X H4) = 320 X 100 mm into a substantially U-shaped cross section. It is data when using a container.

[0104] The main object of the present invention is to reduce the size of the antenna without deteriorating the electrical characteristics. However, since the reflector is the largest of the elements constituting the antenna, the shape of the reflector It is extremely important to reduce the size of the antenna.

[0105] Then, as is clear from the data of reflector A and the data of reflector B, the height of the reflector (specifically, the length in the short direction perpendicular to the radio wave radiation surface) When (b) is small, the gain of antenna 1 decreases over almost the entire band.

[0106] However, the height of reflector B is the same as that of reflector B, and reflector C having a shape in which both long sides of reflector B are bent portions 14 and second reflector 22 is projected in the direction of radiator 10 is provided. If used, the operating gain is Although it is slightly lower than that of gun A, the other characteristics are almost the same.

That is, if the reflector 20 is bent in a substantially U-shaped cross section as in the present embodiment, the reflector height H4 (that is, the first height does not deteriorate the antenna 1 electrical characteristics). The height of the reflector 61 can be shortened, so that the antenna 1 can be configured to be thin and slim.

In the present embodiment, the reflector 20 is a force obtained by bending a metal plate having a size of 320 × 110 mm and a plate pressure t = 0.2 mm. The net formed in the above may be bent. Further, a film-like plate body in which a thin conductive material is integrally formed with a resin may be used. That is, the reflector 20 is not limited to these as long as it is a conductive material.

[0109] In addition, the reflector 20 does not necessarily need to be folded into a U-shaped cross section, and is formed as a flat surface as it is, but is folded back into a generally square shape whose upper and lower sides are inclined toward the radiator. But it ’s okay. That is, the shape of the reflector 20 is not limited to these.

Next, the director 3 will be described.

[0111] As shown in FIG. 1, the director 3 is obtained by punching a thin plate-like metal material with a die or the like in the same manner as the first radiating elements l la and l ib of the radiator 10. Length W3 = 160, width WW3 = 10mm. The distance between the radiator 12 and the waveguide 3 is Ll = 52 mm, and is disposed in front of the radiator 10.

[0112] The waveguide 3 is provided for improving the high frequency characteristics of the antenna 1, and may or may not be provided as necessary.

[Second Embodiment]

Next, a second embodiment of the present invention will be described with reference to FIGS.

FIG. 9 is a schematic perspective view of the antenna of the second embodiment as viewed from the front side, FIG. 10 is a schematic perspective view of the antenna of the second embodiment as viewed from the rear side, and FIG. FIG. 5 is a schematic cross-sectional view in which the antenna of the second embodiment is housed in a decorative case and a part thereof is cut.

[0114] The configuration of the antenna 1 of the present embodiment is basically the same as that of the first embodiment. The difference from the first embodiment is that a signal processing circuit 30 for processing a reception signal output from the radiator 10 of the antenna 1 is provided.

The signal processing circuit 30 has a configuration in which a printed circuit board on which an amplifier circuit or the like is assembled is housed in an electronic equipment box (hereinafter referred to as a shield case) 31 having excellent shielding properties.

The shield case 31 is made of a conductive material such as a metal material, and includes a cylindrical frame 32 that opens at the front and rear, and a lid 33 that closes one opening of the frame 32.

[0117] Then, after housing the printed circuit board or the like inside the frame 32, the opening on the front side is a portion that does not affect the electrical characteristics of the antenna in the first reflector 21 of the reflector 20 (this embodiment In the state, it is fixed to the rear side of the reflector 20).

[0118] Further, the opening on the rear side of the frame 32 is closed with a lid 33 made of a conductive material such as a metal material. As a result, the shield case 31 is formed by the reflector 20, the frame body 32, and the lid body 33, and the inside thereof is sealed and shielded by these parts.

[0119] The signal processing circuit 30 housed in the shield case 31 may be set in accordance with the use of the antenna 1. For example, even if the signal processing circuit 30 is a signal amplification circuit that amplifies the reception signal from the antenna 1, It may be a mixing circuit that mixes the reception signal from the antenna 1 and the reception signal from the external antenna, or may be both a signal amplification circuit and a mixing circuit.

In the present embodiment, the signal processing circuit 30 is composed of a signal amplification circuit and a signal mixing circuit. As shown in FIGS. 10 and 11, the shield case 31 (specifically, the frame body 32) Output to output a signal that is a mixture of the input terminal 35 for receiving the signal received from the external antenna, the signal obtained by amplifying the signal received from antenna 1 and the signal received from the input terminal 35. Terminal 37 is provided. Each of these terminals consists of an F-type terminal for inputting and outputting signals via a coaxial cable.

[0121] Further, the signal processing circuit 30 is supplied with received signals from the feed points 16a and 16b of the radiator 10 via the balanced line 17, the unbalanced conversion circuit 18 and the unbalanced line 19. .

[0122] Further, the reflector 20 (specifically, the first reflector 21) to which the shield case 31 is assembled is provided with a through hole 23 through which the unbalanced line 19 is passed. The size of the hole 23 is set so as not to affect the electrical characteristics of the antenna. [0123] In the present embodiment, the signal processing circuit 30 may be any region as long as it does not affect the force S to be attached to the rear side of the first reflector 21 and the electrical characteristics of the antenna 1. Good. That is, when a part of the reflector 20 is used as a part of the shield case 31 of the signal processing circuit 30 as in the present embodiment, if the electrical characteristics of the antenna 1 are not affected, the reflector 20 It may be the front side or the reflector 20 may be sandwiched between them.

Next, as shown in FIG. 11, the antenna 1 of the present embodiment is housed in a decorative case 40.

[0125] The decorative case 40 has an opening toward the upper side, and a space for accommodating the radiator 10, the reflector 20, and the like 20 is formed on the inner side, and the first radiator 11 is formed from the inner surface. , A decorative case main body 45 in which a boss for attaching the second radiator 12, the waveguide 3, the balance-unbalance conversion portion 18 and the like is integrally projected, and the opening of the decorative case main body 45 is closed. The decorative case cover 46 is configured as described above.

[0126] The decorative case 40 is made of a synthetic resin material or the like whose material and thickness are optimized so as not to affect the electrical characteristics of the antenna.

[0127] A boss 41 formed on the decorative case body 45 is a boss for mounting the first radiator 11 (the first radiating element l ib is shown in the figure). For example, the first radiator 11 is fixed by screws 51.

Similarly, the second radiator 12 (the second radiating element 12b is shown in the figure) is fixed to the boss 42 by the screw 52, and the director 3 is screwed to the boss 43. Fixed by 53

At this time, one end side of the phase adjusting means 15 (the phase adjusting means 15b is shown in the figure) is connected to the base part of the second radiator 12 (the connection point Ca Cb not shown in this figure). ) And the two radiators 12 and the phase adjusting means 15 are completely fixed to each other with the screw 52.

[0130] Then, the other end of the phase adjusting means 15 is connected and fixed at the base of the first radiator 11 (connection point Aa Ab not shown in this figure) with, for example, a screw 55 or the like. The installation of means 15 is complete. [0131] Although not shown in the drawing, by providing a plurality of bosses and the like for supporting the waveguide 3 and the radiator 10 inside the cosmetic case body 45, the waveguide 3 and the radiator 10 are further improved. It can be stably stored in the cosmetic case body 40.

[0132] The reflector 20 is also fixedly attached to the decorative case body 45 with a well-known holding means (not shown). At this time, the reflector 20 attached to the reflector 20 and one of the casings are fixed. The input terminal 35 and the output terminal 37 provided in the signal processing circuit 30 configured in common are the antennas from the terminal section 39 having concentric double draining skirts formed on the bottom of the decorative case body 45. 1 It is configured to project at the bottom.

[0133] When the antenna 1 is used outdoors, the waterproof property can be improved by attaching a waterproof boot (not shown) to the skirt portion of the terminal portion 39.

The balance / unbalance conversion portion 18 is attached to the boss 44 formed on the decorative case main body 45 with a screw 54, and a feeding point (see FIG. 11) provided at a predetermined position of the phase adjusting means 15. 16a, 16b) and the balanced / unbalanced converter 18 are not connected through a balanced line 17. An unbalanced line 19 is connected between the balanced and unbalanced conversion unit 18 and the signal processing circuit 30.

In this manner, the director 3, the radiator 10 and the reflector 20 are arranged in parallel in a predetermined position in the decorative case body 45, and then the decorative case cover 46 is attached to the decorative case body 45. The antenna 1 is completed by covering.

As described above, the antenna 1 of the present embodiment is small and thin, and has high-performance frequency characteristics. Therefore, as shown in FIG. 12A, the antenna mast 50, the veranda, etc. If the mast attaching means 60 for attaching the antenna 1 can be detachably fixed, it can be easily attached to the antenna mast or the like. Fig. 12A shows the antenna 1 attached to the antenna support.

Further, as shown in FIG. 12B, if a stand mounting means 49 is provided on the lower surface side of the decorative case 40 and a mounting stand 61 corresponding to the stand mounting means 49 is attached, the indoor antenna can be obtained. Can also be used. Fig. 12B shows the antenna 1 mounted on the mounting stand. At this time, as shown in the top view of FIG. 12B, if the stand mounting means 49 is configured so that the direction of the antenna can be freely adjusted with respect to the mounting stand 61, the reception sensitivity can be easily adjusted. So convenient.

[0139] In addition, if the mounting stand 61 is configured so that it can be fixed to the installation target, it can be installed on the eaves or on the wall shown in Fig. 12D as shown in Fig. 12C. An antenna having the characteristics can be provided. FIG. 12C shows the mounting state of the antenna 1 under the eaves, and FIG. 12D shows the mounting state of the antenna 1 on the wall surface.

It should be noted that the present invention is not limited to the above-described embodiment, and can be implemented by appropriately changing the configuration of each part.

Claims

The scope of the claims

[1] Balanced antenna radiator,

One or more slits are formed in the plate surface of each of the first radiating elements, respectively.

[2] An antenna radiator in which balanced radiators are spaced apart in the front-rear direction along the radiation direction of radio waves, and the front and rear radiators are connected to each other via phase adjusting means. The radiator on the rear side is a pair of first radiating elements in which a thin plate-like conductive material is formed in a rectangular shape, and the longitudinal axis thereof coincides with each other and is axially symmetrical about a central axis perpendicular to the axis. It is configured by arranging so as to be separated,

An antenna radiator, wherein one or a plurality of slits are formed in a plate surface of the first radiating element constituting the rear radiator.

[3] In the first radiating element constituting the radiator on the rear side, the connection point connected to the phase adjusting means at the base portion close to the central axis is the innermost of the four corners of the first radiating element. 3. The antenna radiator according to claim 2, wherein the antenna radiator is formed at a corner located on the front side of the antenna.

[4] In the first radiating element, The narrow front conductor on the front side of the slit, the narrow back conductor on the rear side of the slit, and the front side on the side of the slit, formed by forming the slit. Of the connecting narrow conductors that connect the narrow conductor and the rear narrow conductor, the line width of the front narrow conductor and the rear narrow conductor is the wavelength of the minimum frequency of the operating frequency λ The width of the connecting narrow conductor that is thinner than λ 1 is approximately 0.1, and the line width of the connecting narrow conductor is approximately 0.1 of the wavelength λ 1 of the minimum frequency of the use frequency. The dimension is such that the narrower conductor on the front side and the narrower conductor on the rear side of the first radiating element thinner than λ1 can be connected and held

Further, a path connecting the connection point with a specific point at a corner located on the opposite side of the connection point along the longitudinal axis of the first radiation element among the four corners of the first radiation element. The dimension of the first path formed by the straight line along the narrow narrow conductor on the front side is, among the frequencies used, 0 to 2 of the wavelength of the frequency 2, and 0.4 λ 2 And

A path connecting the specific point and the connection point, and a second path formed along the inner connecting narrow conductor, the rear narrow conductor, and the outer connecting narrow conductor from the connection point. 4. The antenna radiator according to claim 3, wherein the dimension of the antenna is from 0.2 λ 1 to 0.4 λ 1 of a wavelength λ 1 of a minimum frequency of use. 5.

[5] The antenna according to any one of claims 1 to 4, wherein at least one of the radiating elements is provided with a deformation preventing means for preventing deformation of the radiating element. Radiator.

6. An antenna comprising at least a radiator and a reflector, wherein the radiator comprises the antenna radiator according to any one of claims ;! to 5.

[7] The reflector is:

A rectangular first reflector arranged so that the direction parallel to the polarization direction of the radio wave is the longitudinal direction and substantially parallel to a plane orthogonal to the radio wave radiation direction;

A second reflector formed such that the reflection surface is substantially parallel to the radio wave radiation direction by bending both long sides of the first reflector in the radio wave radiation direction;

The antenna according to claim 6, wherein

[8] A signal that is contained in a shielded electronic equipment box and is transmitted and received through the radiator. A signal processing circuit for processing

The antenna according to claim 7, wherein the electronic device box is configured by using a part of the first reflector.

9. The antenna according to claim 8, wherein the signal processing circuit is an amplifier circuit that amplifies a received signal from the radiator.

10. The antenna according to claim 8, wherein the signal processing circuit is a mixing circuit that mixes a reception signal from the radiator and a signal having a frequency different from that of the reception signal.

[11] The antenna according to any one of claims 6 to 10, wherein a frequency of a signal that can be transmitted and received by the radiator is in a UHF band.