JP6589101B2 - Antenna device - Google Patents

Description

  The present invention relates to an antenna device.

  In a wireless communication system to which a communication standard such as LTE (Long Term Evolution) standard or WiMAX (Worldwide Interoperability for Microwave Access) standard is applied, a multiple-input-and-multiple technique is used to improve communication quality. It's being used.

  For example, MIMO is realized by transmitting information using both vertical polarization and horizontal polarization. In this case, since the vertical polarization and the horizontal polarization are orthogonal to each other, the distance between the antenna that transmits the vertically polarized radio wave and the antenna that transmits the horizontally polarized radio wave can be reduced, and the vertical polarization The interference between the radio wave transmitted by the radio wave and the radio wave transmitted by the horizontally polarized wave can be reduced.

  With respect to MIMO technology, there is known an antenna that switches beams by in-phase / anti-phase excitation of two plate-shaped inverted-F antennas (PIFA) elements arranged in close proximity (for example, non-patent literature). 1). In this technique, strong mutual coupling generated in close proximity is lowered by connecting two elements called neutralization with a short-circuit wire.

Shen Wang, Hiroyuki Arai, “Characteristic Modes Analysis of Coupling Suppression Using Short-circuited Lines between Closely Placed PIFA Elements”, Communication Lectures, IEICE General Conference, B-1-63, March 2014 P. 63

Consider transmitting information using four types of polarization. For example, MIMO can be realized by preparing two antennas for transmitting vertically polarized radio waves and two antennas for transmitting horizontally polarized radio waves, and transmitting information from these four antennas.
However, since it is necessary to arrange a plurality of antennas apart from each other, the size of the antenna increases and the aesthetic appearance is impaired.

  The present invention has been made to solve the above problem, and an object of the present invention is to provide an antenna device that transmits information using four types of polarized waves without increasing the size of the antenna device.

(1) One embodiment of the present invention is a reflector, a plurality of first dipole antennas arranged in a direction orthogonal to the reflector, a direction orthogonal to the reflector, and the plurality of first dipole antennas a plurality of second dipole antenna is positioned in a direction perpendicular to the dipole antenna, in a direction perpendicular to the reflecting plate, and a plurality arranged in a direction forming a first dipole antenna and 45 degrees of the plurality first 3 dipole antennas, a plurality of fourth dipole antennas arranged in a direction perpendicular to the reflector and in a direction of -45 degrees with the plurality of first dipole antennas, and the plurality of first dipole antennas and each of the dipole antenna, the plurality of third dipole antennas each, and a plurality of first conductor for short-circuiting between the both or one of each of the plurality of fourth dipole antenna When, with each of the plurality of second dipole antenna, a third of said plurality die pole antenna and each of the plurality of fourth die pole antenna each one or both a plurality of second connecting between the An antenna device including a conductor wire.

(2) One aspect of the present invention is the antenna device according to the above (1), each of the plurality of first conductor lines, the first die element portion of the pole antenna and front Symbol third dipole antennas between the element portion, and each of both or short one, the plurality of second conductor lines between the elements of the first said element portion of the dipole antenna of the fourth dipole antenna, both between the between the second element of the dipole antenna and front Symbol element portion of the third dipole antenna, and the elements of the second dipole element portion of the antenna and the fourth dipole antenna or It is an antenna device which short-circuits one side.

(3) One aspect of the present invention is the antenna device according to (1) or (2), each of the plurality of first conductor lines, the first element of the first dipole antenna both or one of between the front Symbol first between the element portion, and the first element of the first dipole said second element portion of the antenna a fourth dipole antenna of the third dipole antennas shorting each of said plurality of second conductor lines, between the first element portion of the second die first element of the pole antenna and front Symbol third dipole antenna, and the second The antenna device is connected to one or both of the second element portion of the dipole antenna and the element portions of the plurality of fourth dipole antennas .

(4) One aspect of the present invention is the antenna device according to any one of (1) to (3), wherein the wavelength of the radio wave radiated by the antenna device is λ. The length from the feed point of the dipole antenna to the position where the first conductor wire is connected is in the range of 0.0686676λ to 0.082411λ, and the second conductor wire from the feed point of the second dipole antenna The antenna device has a length up to a position where it is connected in the range of 0.06340λ to 0.07044λ.

(5) One aspect of the present invention is the antenna device according to any one of (1) to (4), wherein the wavelength of the radio wave radiated by the antenna device is λ. The length of the element part of the dipole antenna in the short direction is in the range of 0.01357λ to 0.014927λ, and the length of the element part of the second dipole antenna is in the short direction of 0.014927λ to 0.03481λ. It is an antenna apparatus which is the range of.

(6) One embodiment of the present invention is the antenna device according to any one of the above (1) to (5), wherein each of the plurality of first dipole antennas includes a plurality of second dipole antennas. Each of the plurality of third dipole antennas and each of the plurality of fourth dipole antennas are power supply circuits that supply power to each of the plurality of third dipole antennas.

  According to the present invention, it is possible to provide an antenna device that transmits information using four types of polarized waves without increasing the size of the antenna device.

It is a figure which shows the structure of the antenna apparatus which concerns on 1st Embodiment. It is a figure which shows an example of a horizontal polarization element. It is a figure which shows an example of an electric power feeding circuit. It is a figure which shows the antenna apparatus which does not short-circuit between polarization elements. It is a figure which shows the reflective characteristic of the antenna apparatus which does not short-circuit between polarization elements. It is a figure which shows the reflective characteristic of the antenna device which concerns on 1st Embodiment. It is a figure which shows the electric current distribution of the antenna apparatus which does not short-circuit between polarization elements. It is a figure which shows the electric current distribution of the antenna apparatus which concerns on 1st Embodiment. It is a figure which shows the structure of the antenna apparatus which concerns on 2nd Embodiment. It is a figure which shows the reflective characteristic of the antenna device which concerns on 2nd Embodiment. It is a figure which shows the electric current distribution of the antenna apparatus which concerns on 2nd Embodiment. It is FIG. (1) which shows the position which short-circuits between the polarization elements of the antenna apparatus which concerns on this embodiment. It is FIG. (2) which shows the position which short-circuits between the polarization elements of the antenna apparatus which concerns on this embodiment.

Next, modes for carrying out the present invention will be described with reference to the drawings. Embodiment described below is only an example and embodiment to which this invention is applied is not restricted to the following embodiment.
Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments, and the repetitive description will be omitted.

<First Embodiment>
<Configuration of antenna device>
FIG. 1 is an external view of an antenna device according to this embodiment. The antenna device 100 according to the present embodiment includes a reflecting plate (ground plate) 150, horizontal polarization elements 200 (200a, 200b, 200c, and 200d), and vertical polarization elements 300 (300a, 300b, 300c, 300d, and 300e). , And 300f), a +45 degree polarization element 400 (400a, 400b, and 400c), and a -45 degree polarization element 500 (500a, 500b, and 500c). The reflector 150 is a rectangular substrate made of a dielectric material and having a substantially constant thickness.

  Hereinafter, when it is not necessary to distinguish between the horizontal polarization element 200a and the horizontal polarization element 200d, they are referred to as a horizontal polarization element 200. Further, when it is not necessary to distinguish between the vertical polarization element 300a and the vertical polarization element 300f, they are described as the vertical polarization element 300. When it is not necessary to distinguish the +45 degree polarization element 400a, the +45 degree polarization element 400b, and the +45 degree polarization element 400c, they are described as a +45 degree polarization element 400. When it is not necessary to distinguish the −45 degree polarization element 500a, the −45 degree polarization element 500b, and the −45 degree polarization element 500c, they are referred to as a −45 degree polarization element 500.

In FIG. 1, the feeding point is omitted. Actually, the feeding point is provided on the back surface of the reflector 150 opposite to the surface on which the horizontal polarization element 200, the vertical polarization element 300, the +45 degree polarization element 400, and the -45 degree polarization element 500 are arranged. From there, current is supplied to the horizontal polarization element 200, the vertical polarization element 300, the +45 degree polarization element 400, and the -45 degree polarization element 500.
In FIG. 1, the directions parallel to the reflecting plate 150 and perpendicular to each other are defined as a y-axis and a z-axis, and a direction perpendicular to the y-axis and the z-axis is defined as an x-axis.

  FIG. 2 shows an example of the horizontal polarization element 200. In FIG. 2, the feeding point is omitted. The horizontal polarization element 200 includes two monopole antenna elements 220a and 220b that constitute a dipole antenna on one or both of the front surface and the back surface of the dielectric substrate 205, and the element portions 220a and 220a. A conductor 240a and a conductor 240b are formed from each of the element portions 220b in the direction of the reflecting plate 150 (−X direction). Hereinafter, the element portion 220a and the element portion 220b are referred to as the element portion 220 when it is not necessary to distinguish between them, and the conductor 240a and the conductor 240b are referred to as the conductor 240 when it is not necessary to distinguish between them.

  An example of the dielectric substrate 205 is glass epoxy which is a dielectric material, and the conductors 240a and 240b are made of a metal foil such as copper. The length between both outer ends of the element part 220a and the element part 220b in the longitudinal direction is set to WL, and the length from the surface of the reflector 150 to the center in the short direction of the element part 220a and the element part 220b is high. Set to HL. The vertical polarization element 300, the +45 degree polarization element 400, and the -45 degree polarization element 500 can be applied to the horizontal polarization element 200 shown in FIG.

  An example of the length WL between both outer ends in the longitudinal direction of the element portion 220a and the element portion 220b of the horizontal polarization element 200 is in the range of 0.39λ ± 10% (0.351λ to 0.429λ). An example of the length WL between both outer ends of the element portion 220a and the element portion 220b in the longitudinal direction of the wave element 300 is in a range of 0.38λ ± 10% (0.342λ to 0.418λ). An example of the length WL between both outer ends of the element portions 220a and 220b of the +45 degree polarization element 400 in the longitudinal direction is in a range of 0.46λ ± 10% (0.414λ to 0.506λ). An example of the length WL between the outer ends in the longitudinal direction of the element part 220a and the element part 220b of the -45 degree polarization element 500 is in the range of 0.45λ ± 10% (0.405λ to 0.495λ). . Here, λ is the wavelength of the radiated radio wave. For example, when the frequency of the radiated radio wave is 3.5 GHz, λ is 0.0847 m.

  Returning to FIG. The horizontal polarization element 200a, the horizontal polarization element 200b, the horizontal polarization element 200c, and the horizontal polarization element 200d are arranged at predetermined intervals so that the longitudinal direction of the dipole antenna is parallel to the y-axis.

  Further, the vertical polarization element 300 is arranged in a direction perpendicular to the horizontal polarization element 200, that is, in a direction parallel to the z axis. Further, the vertical polarization element 300a and the vertical polarization element 300d are arranged to face each other at a predetermined interval between the horizontal polarization element 200a and the horizontal polarization element 200b. The vertical polarization element 300b and the vertical polarization element 300e are arranged to face each other at a predetermined interval between the horizontal polarization element 200b and the horizontal polarization element 200c. The vertical polarization element 300c and the vertical polarization element 300f are arranged to face each other at a predetermined interval between the horizontal polarization element 200c and the horizontal polarization element 200d.

  Further, a crossed dipole antenna is configured by arranging the +45 degree polarization element 400a and the −45 degree polarization element 500a so as to intersect each other. This cross dipole antenna has a horizontal polarization element 200a, a horizontal polarization element 200b, a vertical polarization element 200b, a vertical polarization element 300d, and a vertical polarization element 200d. The wave element 300a and the vertical polarization element 300d are arranged so that an angle between them is 45 degrees.

  A crossed dipole antenna is configured by arranging the +45 degree polarization element 400b and the −45 degree polarization element 500b so as to intersect each other. This crossed dipole antenna includes a horizontal polarization element 200b, a horizontal polarization element 200c, a vertical polarization element 200b, a horizontal polarization element 200c, a vertical polarization element 300e, and a vertical polarization element 300e. The wave element 300b and the vertical polarization element 300e are arranged so that the angle between them is 45 degrees.

  A crossed dipole antenna is configured by placing the +45 degree polarization element 400c and the −45 degree polarization element 500c so as to intersect each other. This cross dipole antenna has a horizontal polarization element 200c, a horizontal polarization element 200d, a vertical polarization element 200f, a vertical polarization element 300f, and a vertical polarization element 200f. The wave element 300c and the vertical polarization element 300f are arranged so that the angle between them is 45 degrees.

  Furthermore, one of the element portions 220 (220a or 220b) which is the excitation portion of the horizontal polarization element 200 is connected to one of the element portions 220 (220a or 220b) which is the excitation portion of the +45 degree polarization element 400, and a conductor such as a metal wire. The other is connected to one (220a or 220b) of the element part 220 which is the excitation part of the -45 degree polarization element 500 by a conductor wire such as a metal wire. Furthermore, one of the element parts 220 (220a or 220b) that is the excitation part of the vertical polarization element 300 is connected to one of the element parts 220 (220a or 220b) that is the excitation part of the +45 degree polarization element 400. The other is connected to one (220a or 220b) of the element part 220 which is the excitation part of the -45 degree polarization element 500 by a conductor wire such as a metal wire.

  Specifically, the metal line 250ab short-circuits between the horizontal polarization element 200a and the +45 degree polarization element 400a, and the metal line 250aa short-circuits between the horizontal polarization element 200a and the −45 degree polarization element 500a. To do. The metal line 250ba short-circuits between the horizontal polarization element 200b and the −45 degree polarization element 500a, and the metal line 250bb short-circuits between the horizontal polarization element 200b and the +45 degree polarization element 400a. The metal line 250bc short-circuits between the horizontal polarization element 200b and the -45 degree polarization element 500a, and the metal line 250bd short-circuits between the horizontal polarization element 200b and the +45 degree polarization element 400a.

  The metal line 250ca short-circuits between the horizontal polarization element 200c and the −45 degree polarization element 500c, and the metal line 250cb short-circuits between the horizontal polarization element 200c and the +45 degree polarization element 400c. The metal line 250cc short-circuits between the horizontal polarization element 200c and the −45 degree polarization element 500b, and the metal line 250cd short-circuits between the horizontal polarization element 200c and the +45 degree polarization element 400b. The metal line 250da short-circuits between the horizontal polarization element 200d and the +45 degree polarization element 400c, and the metal line 250db short-circuits between the horizontal polarization element 200d and the −45 degree polarization element 500c.

  The metal line 350aa short-circuits between the vertical polarization element 300a and the +45 degree polarization element 400a, and the metal line 350ab short-circuits between the vertical polarization element 300a and the −45 degree polarization element 500a. Further, the metal line 350ba short-circuits between the vertical polarization element 300b and the +45 degree polarization element 400b, and the metal line 350bb short-circuits between the vertical polarization element 300b and the −45 degree polarization element 500b.

  Further, the metal line 350ca short-circuits between the vertical polarization element 300c and the +45 degree polarization element 400c, and the metal line 350cb short-circuits between the vertical polarization element 300c and the −45 degree polarization element 500c. Further, the metal line 350da short-circuits between the vertical polarization element 300d and the +45 degree polarization element 400a, and the metal line 350db short-circuits between the vertical polarization element 300d and the −45 degree polarization element 500a.

  The metal line 350ea short-circuits between the vertical polarization element 300e and the +45 degree polarization element 400b, and the metal line 350eb short-circuits between the vertical polarization element 300e and the −45 degree polarization element 500b. The metal line 350fa short-circuits between the vertical polarization element 300f and the +45 degree polarization element 400c, and the metal line 350fb short-circuits between the vertical polarization element 300f and the −45 degree polarization element 500c.

  FIG. 3 shows an example of a power feeding circuit to which the antenna device 100 according to this embodiment is connected. An example of the feeding circuit is a parallel feeding circuit, which gives a predetermined excitation amplitude phase distribution to the horizontal polarization element 200, the vertical polarization element 300, the +45 degree polarization element 400, and the −45 degree polarization element 500. The power supply circuit includes a distributor 15, a distributor 25, a distributor 35, a distributor 45, a distributor 55, a distributor 65, a distributor 75, a distributor 85, and a distributor 95. In FIG. 3, the numerical value shown in the antenna device 100 indicates a feeding point.

  Specifically, the power supplied to the horizontal polarization element 200 (H-pol) is output to the distributor 15 and distributed to two. Further, the distributed power is output to the distributor 25 and the distributor 35, respectively. Each of the distributor 25 and the distributor 35 distributes the supplied power to two. The power output from the distributor 25 and the distributor 35 is output to the feeding point 5, the feeding point 6, the feeding point 11, and the feeding point 16. For example, power is fed from the feed point 5 to the horizontal polarization element 200a, fed from the feed point 6 to the horizontal polarization element 200b, fed from the feed point 11 to the horizontal polarization element 200c, and fed from the feed point 16 to the horizontal polarization element 200d. Is supplied with power.

  Further, the power supplied to the vertical polarization element 300 (V-pol) is output to the distributor 45 and distributed to three. Furthermore, the distributed power is output to distributor 55, distributor 65, and distributor 75, respectively. The distributor 55, the distributor 65, and the distributor 75 each distribute the supplied power to two. The electric power output from distributor 55, distributor 65, and distributor 75 is output to feeding point 3, feeding point 4, feeding point 9, feeding point 10, feeding point 14, and feeding point 15, respectively. For example, power is fed from the feed point 3 to the vertical polarization element 300a, fed from the feed point 4 to the vertical polarization element 300b, fed from the feed point 9 to the vertical polarization element 300c, and fed from the feed point 10 to the vertical polarization element 300d. Is fed from the feed point 14 to the vertical polarization element 300e, and fed from the feed point 15 to the vertical polarization element 300f.

Further, the power supplied to the −45 degree polarization element 500 (−45−pol) is output to the distributor 85 and distributed to three. The electric power output from the distributor 85 is output to the feeding point 1, the feeding point 7, and the feeding point 12, respectively. For example, power is supplied from the feed point 1 to the −45 degree polarization element 500a, from the feed point 7 to the −45 degree polarization element 500b, and from the feed point 12 to the −45 degree polarization element 500c.
Further, the power supplied to the +45 degree polarization element 400 (+ 45−pol) is output to the distributor 95 and distributed to three. The power output from the distributor 95 is output to the feeding point 2, the feeding point 8, and the feeding point 13, respectively. For example, power is supplied from the feed point 2 to the +45 degree polarization element 400a, from the feed point 8 to the +45 degree polarization element 400b, and from the feed point 13 to the +45 degree polarization element 400c.

  Thus, by preparing a feeding circuit that feeds power to the horizontal polarization element 200, the vertical polarization element 300, the -45 degree polarization element 500, and the +45 degree polarization element 400, an antenna that radiates four polarizations. A device can be realized.

<Reflection characteristics of antenna device>
The reflection characteristics of the antenna device 100 according to this embodiment will be described. Here, a case where the elements are not connected by a conductor wire such as a metal wire, that is, a case where the elements are not short-circuited will be described.
FIG. 4 shows the antenna device 10 when the elements are not connected with metal wires in FIG. The antenna device 10 includes a reflector (ground plate) 5, a horizontal polarization element 20 (20a, 20b, 20c, 20d), a vertical polarization element 30 (30a, 30b, 30c, 30d, 30e, 30f), and +45. The polarization element 40 (40a, 40b, 40c) and the -45 degree polarization element 50 (50a, 50b, 50c) are provided. The reflector 5 is a rectangular substrate made of a dielectric material and having a substantially constant thickness. 1 can be applied to the arrangement of each element.

FIG. 5 shows an example of the reflection characteristic (S-Parameter) of the antenna device 10 shown in FIG. In FIG. 5, the horizontal axis represents frequency [GHz], and the vertical axis represents S-Parameter [dB].
In the antenna device 10 according to the present embodiment, since the horizontal polarization and the vertical polarization are orthogonal, it is assumed that the degree of mutual coupling between the vertical polarization element 30 and the horizontal polarization element 20 is small. Further, since the −45 polarization and the +45 polarization are orthogonal to each other, it is assumed that the degree of mutual coupling between the −45 degree polarization element 50 and the +45 degree polarization element 40 is small.

  Therefore, in the antenna device 10 according to the present embodiment, the mutual coupling degree between both polarizations radiated by the horizontal polarization element 20 and the −45 degree polarization element 50, and the horizontal polarization element 20 and the +45 degree polarization element 40 are used. The degree of mutual coupling between both polarizations radiated by the vertical polarization element 30 and the degree of mutual coupling between both polarizations radiated by the −45 degree polarization element 50, and the degree of vertical polarization element 30 and +45 degree polarization element The reflection characteristics are compared by the degree of mutual coupling between the two polarized waves radiated by 40.

In FIG. 5, “S1, 3” indicates the mutual coupling amount between the horizontal polarization element 20 and the −45 degree polarization element 50, and “S1, 4” indicates the horizontal polarization element 20 and the +45 degree polarization element. The mutual bond amount between 40 and 40 is shown.
“S2, 3” represents the mutual coupling amount between the vertical polarization element 30 and the −45 degree polarization element 50, and “S2, 4” represents the vertical polarization element 30 and the +45 degree polarization element 40. The mutual coupling | bonding amount between is shown.

  According to the reflection characteristics shown in FIG. 5, for example, when the frequency is in the vicinity of 3.5 GHz, the mutual coupling between the horizontal polarization element 20 and the −45 degree polarization element 50 and the vertical polarization element 30 and −45 degree are obtained. It can be seen that the mutual coupling with the polarization element 50 is −15 dB or more, and the mutual coupling is strong. It can also be seen that the coupling between the vertical polarization element 30 and the horizontal polarization element 20 and the coupling between the −45 degree polarization element 50 and the +45 degree polarization element 40 are weak.

  Further, in the antenna device 10, since the horizontal polarization and the vertical polarization are orthogonal, it can be seen that the degree of mutual coupling between the vertical polarization element 30 and the horizontal polarization element 20 is small. Further, since the −45 polarization and the +45 polarization are orthogonal, it can be seen that the degree of mutual coupling between the −45 degree polarization element 50 and the +45 degree polarization element 40 is small.

  FIG. 6 is an example of the reflection characteristic of the antenna device 100 according to the present embodiment, and shows S-Parameter as in FIG. Also in FIG. 6, the horizontal axis represents frequency [GHz] and the vertical axis represents S-Parameter [dB]. Further, “S1, 3”, “S1, 4”, “S2, 3”, and “S2, 4” shown in FIG. 6 are the same as those in FIG.

  According to the reflection characteristics shown in FIG. 6, for example, in the vicinity of a frequency of 3.5 GHz, mutual coupling between the horizontal polarization element 200 and the −45 degree polarization element 500, and the vertical polarization elements 300 and −45. The mutual coupling with the polarization element 500 is -10 dB or less, and the mutual coupling is weak and the reflection characteristics are improved as compared with the reflection characteristics of the antenna device 10 shown in FIG. I understand that.

  Also in the antenna device 100, since the horizontal polarization and the vertical polarization are orthogonal, the degree of mutual coupling between the vertical polarization element 300 and the horizontal polarization element 200 is small. Further, since the −45 polarization and the +45 polarization are orthogonal to each other, the mutual coupling amount between the −45 degree polarization element 500 and the +45 degree polarization element 400 is small.

<Current distribution>
FIG. 7 shows the current distribution of the antenna device 10.
FIG. 7A shows a case where power is supplied to the vertical polarization element 30 and power is not supplied to the horizontal polarization element 20, the +45 degree polarization element 40, and the −45 degree polarization element 50. 7A that current flows from the vertical polarization element 30 to the +45 degree polarization element 40 and from the vertical polarization element 30 to the −45 degree polarization element 50. FIG.

  FIG. 7B shows a case where power is supplied to the horizontal polarization element 20 and power is not supplied to the vertical polarization element 30, the +45 degree polarization element 40, and the −45 degree polarization element 50. FIG. 7B shows that current flows from the horizontal polarization element 20 to the +45 degree polarization element 40 and from the horizontal polarization element 20 to the −45 degree polarization element 50.

  FIG. 7C shows a case where power is supplied to the +45 degree polarization element 40 and the −45 degree polarization element 50 and not supplied to the horizontal polarization element 20 and the vertical polarization element 30. According to FIG. 7C, it can be seen that current flows from the +45 degree polarization element 40 to the vertical polarization element 30 and from the −45 degree polarization element 50 to the vertical polarization element 30.

FIG. 8 shows a current distribution of the antenna device 100 according to the present embodiment.
FIG. 8A shows a case where power is supplied to the vertical polarization element 300 and power is not supplied to the horizontal polarization element 200, the +45 degree polarization element 400, and the −45 degree polarization element 500. FIG. 8A shows that current flows from the vertical polarization element 300 to the +45 degree polarization element 400 and from the vertical polarization element 300 to the −45 degree polarization element 500. For this reason, compared with the antenna device 10, the antenna device 100 according to this embodiment has a current distribution result between the horizontal polarization element 200 and the +45 degree polarization element 400 and between the horizontal polarization element 200 and the antenna device 10. It can be seen that there is mutual coupling with the −45 degree polarization element 500.

  FIG. 8B shows a case where power is supplied to the horizontal polarization element 200 and power is not supplied to the vertical polarization element 300, the +45 degree polarization element 400, and the −45 degree polarization element 500. FIG. 8B shows that current flows from the horizontal polarization element 200 to the +45 degree polarization element 400 and from the horizontal polarization element 200 to the −45 degree polarization element 500. For this reason, compared with the antenna device 10, the antenna device 100 according to this embodiment has a current distribution result between the horizontal polarization element 200 and the +45 degree polarization element 400 and between the horizontal polarization element 200 and the antenna device 10. It can be seen that there is mutual coupling with the −45 degree polarization element 500.

  FIG. 8C shows a case where power is supplied to the +45 degree polarization element 400 and the −45 degree polarization element 500 and not supplied to the horizontal polarization element 200 and the vertical polarization element 300. As can be seen from FIG. 8C, current flows from the +45 degree polarization element 400 to the vertical polarization element 300 and from the −45 degree polarization element 500 to the vertical polarization element 300. For this reason, compared with the antenna device 10, the antenna device 100 according to the present embodiment has a current distribution result between the +45 degree polarization element 400 and the vertical polarization element 300, and the −45 degree polarization element. It can be seen that there is a mutual coupling between 500 and the vertical polarization element 300.

  In the above-described embodiment, the case where there are three cross dipole antennas configured by arranging the +45 degree polarization element 400 and the −45 degree polarization element 500 so as to intersect with each other has been described. It is not limited to three. The antenna device according to the present embodiment can be applied to a case where the number of cross dipole antennas is four or more. In this case, a horizontal polarization element 200 and a vertical polarization element 300 are prepared so as to surround the four or more cross dipole antennas.

  According to the antenna device according to the present embodiment, the horizontal polarization element, the vertical polarization element, the −45 degree polarization element, and the +45 degree polarization element are configured by a dipole antenna. Further, the antenna device arranges a plurality of horizontal polarization elements at a predetermined interval so that the longitudinal direction of the dipole antenna is parallel to the y-axis, and among the plurality of vertical polarization elements, a set of vertical polarization elements Are arranged so as to face each other at a predetermined interval between adjacent horizontal polarization elements so that the longitudinal direction of the dipole antenna is parallel to the z-axis. Further, the antenna device forms a cross dipole antenna by arranging the +45 degree polarization element and the −45 degree polarization element so as to cross each other, and the cross dipole antenna is adjacent to the adjacent horizontal polarization element. In an area surrounded by the vertical polarization element, the angle between the horizontal polarization element and the vertical polarization element is 45 degrees.

  Further, one of the element parts of the horizontal polarization element and one of the element parts of the +45 degree polarization element are connected by a conductor wire such as a metal wire in order to short-circuit, and the other of the element part is connected to the −45 degree polarization element. In order to short-circuit one of the element portions, a conductor wire such as a metal wire is connected. Further, in order to short-circuit one of the element parts of the vertical polarization element and one of the element parts of the +45 degree polarization element, they are connected by a conductor wire such as a metal wire, and the other of the element part is -45 degree polarization element. In order to short-circuit one of the element portions, a conductor wire such as a metal wire is connected.

  By configuring in this way, the radio wave radiated by each polarization element as compared with the case where the horizontal polarization element, the vertical polarization element, the +45 degree polarization element, and the −45 degree polarization element are not short-circuited. Therefore, the reflection characteristics of the antenna can be improved.

<Second Embodiment>
<Configuration of antenna device>
FIG. 9 shows an external view of the antenna device according to the present embodiment. The antenna device 600 according to the present embodiment includes a reflector (ground plate) 650, horizontal polarization elements 700 (700a, 700b, 700c, and 700d), and vertical polarization elements 800 (800a, 800b, 800c, 800d, and 800e). , And 800f), a +45 degree polarization element 900 (900a, 900b, and 900c), and a -45 degree polarization element 1000 (1000a, 1000b, and 1000c). The reflector 650 is a rectangular substrate made of a dielectric material and having a substantially constant thickness.

  Hereinafter, when it is not necessary to distinguish between the horizontal polarization element 700a and the horizontal polarization element 700d, they are referred to as a horizontal polarization element 700. Further, when it is not necessary to distinguish between the vertical polarization element 800a and the vertical polarization element 800f, they are described as the vertical polarization element 800. When it is not necessary to distinguish the +45 degree polarization element 900a, the +45 degree polarization element 900b, and the +45 degree polarization element 900c, they are described as the +45 degree polarization element 900. When it is not necessary to distinguish the −45 degree polarization element 1000a, the −45 degree polarization element 1000b, and the −45 degree polarization element 1000c, they are described as a −45 degree polarization element 1000.

In FIG. 9, the feeding point is omitted. Actually, the feeding point is provided on the back surface of the reflector 650 opposite to the surface on which the horizontal polarization element 700, the vertical polarization element 800, the +45 degree polarization element 900, and the -45 degree polarization element 1000 are arranged. From there, current is supplied to the horizontal polarization element 700, the vertical polarization element 800, the +45 degree polarization element 900, and the -45 degree polarization element 1000.
In FIG. 9, directions parallel to the reflecting plate 650 and orthogonal to each other are defined as a y-axis and a z-axis, and a direction perpendicular to the y-axis and the z-axis is defined as an x-axis.
As an example of the shape of the horizontal polarization element 700, the vertical polarization element 800, the +45 degree polarization element 900, and the −45 degree polarization element 1000, FIG. 2 can be applied.

  The horizontal polarization element 700a, the horizontal polarization element 700b, the horizontal polarization element 700c, and the horizontal polarization element 700d are arranged at predetermined intervals so that the longitudinal direction of the dipole antenna is parallel to the y-axis.

  Further, the vertical polarization element 800 is arranged in a direction perpendicular to the horizontal polarization element 700, that is, in a direction parallel to the z axis. Further, the vertical polarization element 800a and the vertical polarization element 800d are arranged to face each other at a predetermined interval between the horizontal polarization element 700a and the horizontal polarization element 700b. The vertical polarization element 800b and the vertical polarization element 800e are arranged to face each other at a predetermined interval in a space between the horizontal polarization element 700b and the horizontal polarization element 700c. The vertical polarization element 800c and the vertical polarization element 800f are arranged to face each other at a predetermined interval between the horizontal polarization element 700c and the horizontal polarization element 700d.

  Further, a crossed dipole antenna is configured by arranging the +45 degree polarization element 900a and the −45 degree polarization element 1000a so as to intersect each other. This crossed dipole antenna includes a horizontal polarization element 700a, a horizontal polarization element 700b, a vertical polarization element in a region surrounded by the horizontal polarization element 700a, the horizontal polarization element 700b, the vertical polarization element 800a, and the vertical polarization element 800d. The wave element 800a and the vertical polarization element 800d are arranged to form 45 degrees with each other.

  A crossed dipole antenna is configured by placing the +45 degree polarization element 900b and the −45 degree polarization element 1000b so as to intersect each other. This cross dipole antenna has a horizontal polarization element 700b, a horizontal polarization element 700c, a vertical polarization element in an area formed by the horizontal polarization element 700b, the horizontal polarization element 700c, the vertical polarization element 800b, and the vertical polarization element 800e. The polarization element 800b and the vertical polarization element 800e are arranged to form 45 degrees with each other.

  A crossed dipole antenna is configured by arranging the +45 degree polarization element 900 c and the −45 degree polarization element 1000 c so as to intersect each other. This cross dipole antenna has a horizontal polarization element 700c, a horizontal polarization element 700d, a vertical polarization element 700c, and a vertical polarization element 700c in a region surrounded by the horizontal polarization element 700c, the horizontal polarization element 700d, the vertical polarization element 800c, and the vertical polarization element 800f. The wave element 800c and the vertical polarization element 800f are arranged to form 45 degrees with each other.

  Furthermore, one (220a or 220b) of the element part 220 which is an excitation part of the horizontal polarization element 700 and one (220a or 220b) of the element part 220 which is an excitation part of the +45 degree polarization element 900 or a −45 degree deviation. In order to short-circuit one (220a or 220b) of the element part 220 which is the excitation part of the wave element 1000, it connects with conductor wires, such as a metal wire. Also, one (220a or 220b) of the element part 220 that is the excitation part of the vertical polarization element 800 and one (220a or 220b) or -45 degree deviation of the element part 220 that is the excitation part of the +45 degree polarization element 900. In order to short-circuit one (220a or 220b) of the element part 220 which is the excitation part of the wave element 1000, it connects with conductor wires, such as a metal wire.

  Specifically, the metal wire 750ab short-circuits between one (220a or 220b) of the element part 220 of the horizontal polarization element 700a and one (220a or 220b) of the element part 220 of the +45 degree polarization element 900a, The metal line 750bc short-circuits between one (220a or 220b) of the element part 220 of the horizontal polarization element 700b and one (220a or 220b) of the element part 220 of the -45 degree polarization element 1000a. Further, the metal line 750ba short-circuits between one (220a or 220b) of the element part 220 of the horizontal polarization element 700b and one (220a or 220b) of the element part 220 of the -45 degree polarization element 1000b. 750cd short-circuits between one (220a or 220b) of the element part 220 of the horizontal polarization element 700c and one (220a or 220b) of the element part 220 of the +45 degree polarization element 900b.

  Further, the metal line 750cb short-circuits between one of the element parts 220 (220a or 220b) of the horizontal polarization element 700c and one of the element parts 220 (220a or 220b) of the +45 degree polarization element 900c, and the metal line 750db. Short-circuits between one (220a or 220b) of the element part 220 of the horizontal polarization element 700d and one (220a or 220b) of the element part 220 of the -45 degree polarization element 1000c. Further, the metal wire 850ab short-circuits between one (220a or 220b) of the element part 220 of the vertical polarization element 800a and one (220a or 220b) of the element part 220 of the -45 degree polarization element 1000a. 850bb short-circuits one (220a or 220b) of the element part 220 of the vertical polarization element 800b and one (220a or 220b) of the element part 220 of the -45 degree polarization element 1000b.

Further, the metal wire 850cb short-circuits between one (220a or 220b) of the element part 220 of the vertical polarization element 800c and one (220a or 220b) of the element part 220 of the -45 degree polarization element 1000c. 850da shorts between one (220a or 220b) of the element part 220 of the vertical polarization element 800d and one (220a or 220b) of the element part 220 of the +45 degree polarization element 900a. Further, the metal line 850ea short-circuits between one of the element parts 220 (220a or 220b) of the vertical polarization element 800e and one of the element parts 220 (220a or 220b) of the +45 degree polarization element 900b, and the metal line 850fa. Short-circuits between one (220a or 220b) of the element part 220 of the vertical polarization element 800f and one (220a or 220b) of the element part 220 of the +45 degree polarization element 900c.
FIG. 3 can be applied to a power feeding circuit to which the antenna device 600 according to the present embodiment is connected.

  Thus, by preparing a feeding circuit that feeds power to the horizontal polarization element 700, the vertical polarization element 800, the -45 degree polarization element 1000, and the +45 degree polarization element 900, an antenna that radiates four polarizations. A device can be realized.

<Reflection characteristics of antenna device>
The reflection characteristics of the antenna device 600 according to this embodiment will be described.
In the antenna device 600 according to the present embodiment, since the horizontal polarization and the vertical polarization are orthogonal, it is assumed that the degree of mutual coupling between the vertical polarization element 800 and the horizontal polarization element 700 is small. Further, since the −45 polarization and the +45 polarization are orthogonal to each other, it is assumed that the degree of mutual coupling between the −45 degree polarization element 1000 and the +45 degree polarization element 900 is small.

  Therefore, also in the antenna device 600 according to the present embodiment, the mutual coupling degree between both polarizations radiated by the horizontal polarization element 700 and the −45 degree polarization element 1000, and the horizontal polarization element 700 and the +45 degree polarization element. 900, the degree of mutual coupling between both polarizations radiated by the 900, the degree of mutual coupling between both polarizations radiated by the vertical polarization element 800 and the -45 degree polarization element 1000, and the vertical polarization element 800 and +45 degree polarization. The reflection characteristics are compared with the mutual coupling degree between both polarized waves radiated by the element 900.

  FIG. 10 shows an example of the reflection characteristic of the antenna device 600 shown in FIG. FIG. 10 also shows S-Parameters as in FIGS. 5 and 6. Also in FIG. 10, the horizontal axis represents frequency [GHz] and the vertical axis represents S-Parameter [dB]. Further, “Sx, y” (x = 1, 2, 3, 4, y = 1, 2, 3, 4) shown in FIG. 10 is the same as FIG.

  According to the reflection characteristics shown in FIG. 10A, the mutual coupling amount (S1, 3) between the horizontal polarization element 700 and the −45 degree polarization element 1000 is − when the frequency is near 3.5 GHz. Compared with the reflection characteristic of the antenna device 100 shown in FIG. 6, it is found that the mutual coupling amount is small and the reflection characteristic is improved.

  According to the reflection characteristics shown in FIG. 10B, the mutual coupling amount (S1, 4) between the horizontal polarization element 700 and the +45 degree polarization element 900 is −15 dB when the frequency is in the vicinity of 3.5 GHz. It can be seen that the amount of mutual coupling is smaller than that of the antenna device 100 shown in FIG. 6 and the reflection characteristics are improved.

  According to the reflection characteristics shown in FIG. 10C, the mutual coupling amount (S2, 3) between the vertical polarization element 800 and the −45 degree polarization element 1000 is − when the frequency is in the vicinity of 3.5 GHz. Compared with the reflection characteristic of the antenna device 100 shown in FIG. 6, it is found that the mutual coupling amount is small and the reflection characteristic is improved.

  According to the reflection characteristic shown in FIG. 10D, when the frequency is in the vicinity of 3.5 GHz, the mutual coupling amount (S2, 4) between the vertical polarization element 800 and the +45 degree polarization element 900 is −15 dB. It can be seen that the amount of mutual coupling is smaller than that of the antenna device 100 shown in FIG. 6 and the reflection characteristics are improved.

  That is, the antenna device 600 according to the present embodiment is connected by a conductor wire such as a metal wire in order to short-circuit one of the elements for which mutual coupling between the elements is to be suppressed. That is, in order to short-circuit one of the two monopole antennas constituting the dipole antenna, the conductors are connected by a conductor wire such as a metal wire. By configuring in this way, current flows on one arm side of the dipole and no current flows on both arm sides, so that re-radiation can be reduced. The antenna device 600 can reduce mutual coupling. For this reason, the antenna device 600 according to the present embodiment can improve the reflection characteristics as compared with the antenna device 100 according to the first embodiment.

<Current distribution>
FIG. 11 shows the current distribution of the antenna device 600 according to this embodiment.
FIG. 11A shows a case where power is supplied to the vertical polarization element 800 and power is not supplied to the horizontal polarization element 700, the +45 degree polarization element 900, and the −45 degree polarization element 1000. According to FIG. 11 (a), compared with the current characteristics of the antenna device 100 shown in FIG. 7 (a) and FIG. 8 (a), the current flowing from the vertical polarization element 800 to the +45 degree polarization element 900, It can also be seen that the current flowing from the vertical polarization element 800 to the −45 degree polarization element 1000 is reduced. For this reason, compared with the antenna device 10 and the antenna device 100, the antenna device 600 according to the present embodiment includes the vertical polarization element 800 and the +45 degree polarization element 900, and the vertical polarization element 800 and −45. The degree of mutual coupling with the polarization element 1000 can be reduced.

  FIG. 11B shows a case where power is supplied to the horizontal polarization element 700 and power is not supplied to the vertical polarization element 800, the +45 degree polarization element 900, and the −45 degree polarization element 1000. According to FIG.11 (b), compared with the current characteristic of the antenna apparatus 100 shown by FIG.7 (b) and FIG.8 (b), the electric current which flows into the +45 degree | times polarization element 900 from the horizontal polarization element 700, It can be seen that the current flowing from the horizontal polarization element 700 to the −45 degree polarization element 1000 is reduced. For this reason, compared with the antenna device 100, the antenna device 600 according to the present embodiment includes the horizontal polarization element 700 and the +45 degree polarization element 900, and the horizontal polarization element 700 and the −45 degree polarization element. The degree of mutual coupling with 1000 can be reduced.

  FIG. 11C shows a case where power is supplied to the +45 degree polarization element 900 and the −45 degree polarization element 1000 and is not supplied to the horizontal polarization element 700 and the vertical polarization element 800. According to FIG. 11 (c), compared to the current characteristics of the antenna device 100 shown in FIG. 7 (c) and FIG. 8 (c), the current flowing from the +45 degree polarization element 900 to the vertical polarization element 800, It can be seen that the current flowing from the −45 degree polarization element 1000 to the vertical polarization element 800 is reduced. For this reason, compared with the antenna device 100, the antenna device 600 according to the present embodiment includes the +45 degree polarization element 900 and the vertical polarization element 800, and the -45 degree polarization element 1000 and the vertical polarization element. The degree of mutual coupling with 800 can be reduced.

  In the above-described embodiment, the case where there are three cross dipole antennas configured by arranging the +45 degree polarization element 900 and the −45 degree polarization element 1000 so as to intersect with each other has been described. It is not limited to three. The antenna device according to the present embodiment can be applied to a case where the number of cross dipole antennas is four or more. In this case, a horizontal polarization element 700 and a vertical polarization element 800 are prepared so as to surround four or more cross dipole antennas.

  According to the antenna device according to the present embodiment, the horizontal polarization element, the vertical polarization element, the −45 degree polarization element, and the +45 degree polarization element are configured by a dipole antenna. Further, the antenna device arranges a plurality of horizontal polarization elements at a predetermined interval so that the longitudinal direction of the dipole antenna is parallel to the y-axis, and among the plurality of vertical polarization elements, a set of vertical polarization elements Are arranged so as to face each other between adjacent horizontal polarization elements so that the longitudinal direction of the dipole antenna is parallel to the z-axis. Further, the antenna device forms a cross dipole antenna by arranging the +45 degree polarization element and the −45 degree polarization element so as to cross each other, and the cross dipole antenna is adjacent to the adjacent horizontal polarization element. In an area surrounded by the vertical polarization element, the angle between the horizontal polarization element and the vertical polarization element is 45 degrees.

  Furthermore, in order to short-circuit one of the element parts of the horizontal polarization element and one of the element part of the +45 degree polarization element or the element part of the −45 degree polarization element, they are connected by a conductor wire such as a metal wire, In order to short-circuit one of the element parts of the wave element and one of the element part of the +45 degree polarization element or the element part of the −45 degree polarization element, they are connected by a conductor wire such as a metal wire.

  With this configuration, each polarization is compared with the case where the horizontal polarization element, the vertical polarization element, the +45 degree polarization element, and the −45 degree polarization element are not connected by a conductor wire such as a metal wire. Since the degree of mutual coupling of radio waves radiated by the wave element can be reduced, the reflection characteristics of the antenna can be improved.

  Further, one of the element parts of the horizontal polarization element and one of the element parts of the +45 degree polarization element are connected by a conductor wire such as a metal wire in order to short-circuit, and the other of the element part is connected to the −45 degree polarization element. In order to short-circuit one of the element parts, a conductor wire such as a metal wire is connected, and further, one of the element part of the vertical polarization element and one of the element part of the +45 degree polarization element are short-circuited. Compared with the case of connecting with a conductor wire such as a metal wire in order to short-circuit the other of the element portion and one of the element portions of the −45 degree polarization element with a conductor wire such as a wire. Since the mutual coupling degree of the radio waves radiated by the element can be reduced, the reflection characteristics of the antenna can be improved.

<Modification>
In the antenna device 100 and the antenna device 600 according to the above-described embodiment, positions where conductor wires such as metal wires are provided are shown.
12 and 13 show parameters for explaining the position of the metal wire in the antenna device 100 and the antenna device 600. FIG.
In FIG. 12, “x1” and “x2” indicate the lengths in the short side direction along the x-axis of the element portion 220 of the horizontal polarization element 200 and the horizontal polarization element 700, and “x3” and “x4” The length in the short side direction along the x-axis of the vertical polarization element 300 and the element part 220 of the vertical polarization element 800 is shown.

  The lengths “x1” and “x2” in the short-side direction along the x-axis of the horizontal polarization element 200 and the element part 220 of the horizontal polarization element 700 are preferably in the range of 0.01357λ to 0.014927λ. Further, the lengths “x3” and “x4” in the short side direction along the x-axis of the vertical polarization element 300 and the element portion 220 of the vertical polarization element 800 are in the range of 0.014927λ to 0.03481λ. Is preferred.

  In FIG. 13, “y1” indicates the length in the y-axis direction from the center in the longitudinal direction of the element portion 220 of the horizontal polarization element 200 to the position where the conductor line such as a metal line is disposed, and “y2” indicates the horizontal deflection. The length in the y-axis direction from the center in the longitudinal direction of the element unit 200 of the wave element 700 to the position where the conductor line such as a metal line is arranged is shown. In addition, “z1” indicates the length in the z-axis direction from the center in the longitudinal direction of the element portion 220 of the vertical polarization element 300 to the position where the conductor line such as a metal line is disposed, and “z2” indicates the vertical polarization element 300. The length of the element part 220 in the z-axis direction from the center in the longitudinal direction to the position where the conductor line such as a metal line is arranged is shown.

  The length “y1” in the y-axis direction from the center in the longitudinal direction of the element portion 220 of the horizontal polarization element 200 to the position where the metal line is disposed, and the metal from the center in the longitudinal direction of the element portion 220 of the horizontal polarization element 700 The length “y2” in the y-axis direction to the position where the line is arranged is preferably in the range of 0.068676λ to 0.082411λ. Further, the length “z1” in the z-axis direction from the center in the longitudinal direction of the element part 220 of the vertical polarization element 300 to the position where the metal wire is disposed, and the center in the longitudinal direction of the element part 220 of the horizontal polarization element 700 The length “z2” in the z-axis direction from the position to the position where the metal wire is disposed is preferably in the range of 0.0634014λ to 0.070446λ.

Conventionally, the coupling between antennas is strong, and the polarization diversity effect and the polarization MIMO effect are sufficient unless it is between orthogonal polarizations such as vertical polarization and orthogonal polarization, and +45 degree polarization and -45 degree polarization. Couldn't get.
According to the present embodiment and the antenna device according to the deformability, the amount of coupling between antennas can be suppressed even between orthogonal polarizations, so that a polarization diversity effect and a polarization MIMO effect can be obtained.
As a result, in the past, two orthogonally polarized antennas were installed with sufficient spacing such as 5 wavelengths. However, according to the antenna device according to the present embodiment and the modification, one antenna is used for each polarized wave. The antenna cost can be reduced, the installation can be improved, and the appearance can be improved.

  In the embodiment and the modification described above, the number of horizontal polarization elements, vertical polarization elements, +45 degree polarization elements, and −45 degree polarization elements is an example, and four or more pairs of vertical polarization elements, 3 pairs The present invention can also be applied to the case where the above horizontal elements, four or more +45 degree polarization elements, and four or more -45 degree polarization elements are used. Further, the length in the longitudinal direction of the horizontal polarization element, the vertical polarization element, the +45 degree polarization element, and the −45 degree polarization element and the interval between them can be appropriately changed according to the frequency of the radiated radio wave. .

  Further, in the above-described embodiment, the case of a rectangle is described as an example of the reflection plate, but the shape is not limited to a rectangle, and may be a circular shape. Although the case where a dielectric is used as an example of the reflection plate has been described, the invention is not limited to the dielectric, and a metal plate may be used. In the above-described embodiment, the case where the horizontal polarization element, the vertical polarization element, the +45 degree polarization element, and the −45 degree polarization element are formed on the same surface of the reflector is described. May be formed.

  In the embodiment described above, the horizontal polarization element is an example of the first dipole antenna, the vertical polarization element is an example of the second dipole antenna, and the +45 degree polarization element is an example of the third dipole antenna. The −45 degree polarization element is an example of a fourth dipole antenna.

  Although the present invention has been described with reference to specific embodiments and modifications, each embodiment and modification is merely an example, and those skilled in the art will recognize various modifications, modifications, alternatives, substitutions, and the like. Will understand. The present invention is not limited to the above-described embodiments, and various variations, modifications, alternatives, substitutions, and the like are included without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Antenna apparatus 150 ... Reflector 200 (200a, 200b, 200c, 200d) ... Horizontal polarization element 300 (300a, 300b, 300c, 300d) ... Vertical polarization element 400 (400a, 400b, 400c, 400d) ...- 45 degree polarization element 500 (500a, 500b, 500c, 500d) ... + 45 degree polarization element 600 ... antenna device 650 ... reflector 700 (700a, 700b, 700c, 700d) ... horizontal polarization element 800 (800a, 800b, 800c, 800d) Vertical polarization element 900 (900a, 900b, 900c, 900d) ... -45 degree polarization element 1000 (1000a, 1000b, 1000c, 1000d) ... +45 degree polarization element

Claims (6)

A reflector,
A plurality of first dipole antennas disposed in a direction orthogonal to the reflector;
In a direction perpendicular to the reflecting plate, and a plurality of second dipole antenna is positioned in the direction and perpendicular to the plurality of first dipole antenna,
A plurality of third dipole antennas disposed in a direction orthogonal to the reflector and in a direction forming 45 degrees with the plurality of first dipole antennas;
A plurality of fourth dipole antennas arranged in a direction perpendicular to the reflector and in a direction of -45 degrees with the plurality of first dipole antennas;
A plurality of first conductor wires that short-circuit each of the plurality of first dipole antennas and both or one of each of the plurality of third dipole antennas and each of the plurality of fourth dipole antennas. When,
A plurality of second conductor wires that short-circuit each of the plurality of second dipole antennas and both or one of each of the plurality of third dipole antennas and each of the plurality of fourth dipole antennas. An antenna device comprising: Each of the plurality of first conductor wires includes an element portion of the first dipole antenna and an element portion of the third dipole antenna, and an element portion of the first dipole antenna and the fourth dipole antenna . Short-circuit both or one of the elements of the dipole antenna ,
Each of the plurality of second conductor lines is between the element portion of the second dipole antenna and the element portion of the third dipole antenna , and between the element portion of the second dipole antenna and the fourth dipole antenna . The antenna device according to claim 1, wherein both or one of the dipole antenna elements is short-circuited. Each of the plurality of first conductor lines is provided between the first element portion of the first dipole antenna and the first element portion of the third dipole antenna and between the first element portion of the first dipole antenna. Short-circuiting both or one of the two element portions and the first element portion of the fourth dipole antenna ;
Each of the plurality of second conductor lines is provided between the first element portion of the second dipole antenna and the first element portion of the third dipole antenna and between the first element portion of the second dipole antenna. 3. The antenna device according to claim 1, wherein the antenna device is connected to both or one of the two element portions and the element portions of the plurality of fourth dipole antennas . When the wavelength of the radio wave radiated by the antenna device is λ,
The length from the feeding point of the first dipole antenna to the position where the first conductor wire is connected ranges from 0.068676λ to 0.082411λ,
The length from the feeding point of the second dipole antenna to the position where the second conductor wire is connected is in the range of 0.06340λ to 0.07044λ, according to any one of claims 1 to 3. The antenna device described. When the wavelength of the radio wave radiated by the antenna device is λ,
The length of the element part of the first dipole antenna in the short direction is in the range of 0.01357λ to 0.014927λ,
5. The antenna device according to claim 1, wherein a length in a short direction of an element portion of the second dipole antenna is in a range of 0.014927λ to 0.03481λ. A feeding circuit that feeds power to each of the plurality of first dipole antennas, each of the plurality of second dipole antennas, each of the plurality of third dipole antennas, and each of the plurality of fourth dipole antennas; The antenna device according to any one of claims 1 to 5, further comprising:

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