JPH08265042A - Grid array antenna in common use for polarized wave - Google Patents

Abstract

PURPOSE: To attain transmission and reception of radio waves of both a horizontally polarized wave and a vertically polarized wave with a small sized and simple device by using one ground flat plate in common and arranging two grid array antenna elements in orthogonally crossed state through overlapping arrangement. CONSTITUTION: A grid array antenna element 11 for horizontal polarization is arranged on a 1st plane in parallel with and in the vicinity of a common ground plate 10. A grid array antenna element 12 for vertical polarization overlapped on the horizontal polarized wave grid array antenna element 11 in an orthogonal state is provided onto a 2nd plate in parallel with and in the vicinity of the 1st plane. Feeding points F1 , F2 are provided around the center of each of the grid array antenna elements 11, 12 respectively. When the short side of a grid cell 2 of each of the grid array antenna elements 11, 12 is called S, the long side is L and the wavelength of a radio wave is λ, it is preferred to let them satisfy a relation 0.45λ<=S<=0.6λ and the length of the long side L is nearly twice that of the short side S.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarization-combined grid array antenna which can transmit and receive horizontally polarized waves and vertically polarized waves and is particularly suitable for satellite communication reception.

[0002]

2. Description of the Related Art A grid array antenna has a grid array antenna element in which a plurality of grid cells each composed of a conductor having four sides of a square are connected and arranged. The grid array antenna is arranged on a plane parallel and close to a ground plate. When the array antenna element is arranged, a radiation beam is formed on the side of the ground plate on which the grid array antenna element is arranged.

In addition, a paper entitled "Numerical Analysis of Grid Array Antenna (I
V) ”, the present inventor can form a bidirectional beam that is bilaterally symmetrical by setting the feeding point near the center of the grid array antenna element so that the grid cells of the grid array antenna element are bilaterally symmetrical. Further, by appropriately setting the dimensions of the short side S and the long side L of the grid cell with respect to the wavelength of the radio wave, a single sharp edge is formed in the normal direction of the grid array antenna element arrangement plane (the direction perpendicular to the ground plate). It has announced that it can create a beam.

FIG. 11 shows a conventional example of a grid array antenna having the same structure as the grid array antenna proposed in the paper "Numerical Analysis of Grid Array Antenna (IV)" of the 1994 Autumn Meeting of the Institute of Electronics, Information and Communication Engineers. ,
In this figure, 1 is a ground plate which is a conductor plate made of metal or the like, 2 is a grid cell of linear (or strip-shaped) conductors that form four sides of a rectangle having a short side S and a long side L, and 3 is a plurality. It is a grid array antenna element that combines grid cells. When the grid array antenna element 3 is manufactured by combining a plurality of grid cells 2, the grid cells 2 may be combined so that the short side S is common in the longitudinal direction of the grid cells 2. In the short-side direction, the short side S is connected in the middle of the long side L of the adjacent grid cell 2. The grid array antenna element 3 formed by combining a plurality of grid cells 2 is on a plane parallel and close to the ground flat plate 1 having a larger area than the element 3, and the height H from the ground flat plate 1 is It is set to less than 1/2 of the wavelength λ of transmitted / received radio waves. The feeding point F is
It is provided near the center of the grid array antenna element 3 so that the grid cell arrangement is symmetrical.
Power can be supplied by coaxial cable.

In the grid array antenna shown in FIG. 11, the shortest side S of the grid cell 2 is 1/2 of the wavelength λ of the transmitted / received radio wave and the long side L thereof is the wavelength λ, which is the most preferable in the operating principle. , The current waveform flowing in the long side L is λ /
The current is negligible on the entire length of the long side L because it becomes the opposite phase for every two, and only the short side S of λ / 2 functions effectively as an antenna element, and the radio wave of polarization parallel to the direction of the short side S is obtained. Can be sent and received efficiently. That is, if the short side S is horizontally arranged, horizontal polarized waves can be transmitted / received, and if the short side S is vertically arranged, vertically polarized electromagnetic waves can be transmitted / received.

The radiation beam is formed on the side where the grid array antenna element 3 is provided as viewed from the ground plate 1, and the grid cell array element 3 is arranged so that the grid cell arrangement is bilaterally symmetrical in both the short side direction and the long side direction. While supplying power from the vicinity of the center of the grid cell 2 and setting the short side S and the long side L of the grid cell 2 within the proper size range, a single sharp radiation beam can be formed in the normal direction of the arrangement plane of the grid array antenna element 3. It is possible.

It is desirable that the number of the short sides S arranged in the direction parallel to the short sides is the same as the number of the short sides S arranged in the direction parallel to the long sides in order to make the radiation beam into a spindle shape. . Incidentally, in the conventional example of FIG. 11, the number of the short sides S arranged in the direction parallel to the short sides is 9, and the number of the short sides S arranged in the direction parallel to the long sides is also 9.

[0008]

According to the conventional grid array antenna shown in FIG. 11, a single sharp radiation beam (directional beam) is created in the normal direction of the arrangement plane of the grid array antenna element 3. Therefore, the grid array antenna can be used or combined to form a dual polarization antenna for satellite communication reception, for example.

However, since the dual-polarized antenna must receive (or transmit) radio waves of two types of polarized waves, that is, a horizontally polarized wave and a vertically polarized wave, the conventional polarization array antenna is used for the dual polarized wave. To construct the antenna, two grid array antennas (for horizontal polarization and vertical polarization) must be used, or one grid array antenna must be rotatable by 90 degrees.

When two grid array antennas are used, it is uneconomical because the installation place and the cost are about doubled, and it is possible to rotate one grid array antenna by 90 degrees. There are many problems because we have to prepare.

In view of the above points, the present invention uses one ground flat plate in common and arranges two grid array antenna elements in parallel with each other at different heights so as to form a right angle with each other. , The purpose of the present invention is to provide a polarization-combined grid array antenna that does not increase the installation area, does not require a rotating mechanism, and can transmit and receive both horizontally polarized waves and vertically polarized waves with a small and simple mechanism. And

Other objects and novel features of the present invention will be clarified in Examples described later.

[0013]

In order to achieve the above object, a polarization-combined grid array antenna according to the present invention comprises a common ground plane and a first plane on a first plane parallel and close to the common ground plane. And a second grid array antenna element that is located on a second plane that is parallel and close to the first plane and that is orthogonally overlapped with the first grid array antenna element. It has a structure.

When the short side of the grid cell of each grid array antenna element is S, the long side is L, and the wavelength of the radio wave is λ, 0.45λ ≦ S ≦ 0.6λ, and the long side L
Is preferably set to approximately twice the short side S.

Further, it is desirable that the first and second grid array antenna elements are stacked so that their center positions substantially coincide with each other.

It is also possible to provide a feeding point near the center of each of the first and second grid array antenna elements and feed each feeding point by a coaxial line.

Feeding points are respectively provided near the centers of the first and second grid array antenna elements, and probes connected to the feeding points are projected into a circular or rectangular waveguide, and the circular or rectangular waveguide is provided. It may be configured to supply power by.

[0018]

In the dual-polarization grid array antenna of the present invention, one ground flat plate is commonly used for two grid array antenna elements that are crossed at different heights (without contact) at right angles. If one of the grid array antenna elements is arranged to be able to transmit and receive horizontal polarized waves, the other grid array antenna element has a positional relationship capable of transmitting and receiving vertical polarized waves,
Both horizontal and vertical polarized waves can be transmitted and received without rotating the 90 degree antenna, and the installation area is the same as the conventional grid array antenna having one grid array antenna element, increasing the installation place. Never invite.

Further, although the first grid array antenna element and the second grid array antenna element orthogonal to the first grid array antenna element have a structure in which the heights thereof are close to each other,
Since the mutual influence of the horizontal polarization and the vertical polarization can be suppressed to a low level, the cross polarization characteristic is hardly deteriorated.

The short side of the grid cell of each grid array antenna element is S and the long side is L, and the wavelength of the radio wave is λ.
Then, when 0.45λ ≦ S ≦ 0.6λ and the long side L is set to be approximately twice the short side S, a single sharp radiation beam is formed in the normal direction of the arrangement plane of each grid array antenna element. (Directional beam) can be formed (however, the beam is formed on the grid array antenna element arrangement side as viewed from the common ground plate). Therefore, the antenna directivity characteristics and the antenna gain can be improved.

Further, in the case where the first and second grid array antenna elements are stacked so that the center positions thereof are substantially coincident with each other, there are many overlapping portions of the first and second grid array antenna elements. Therefore, the area of the common ground plate is the minimum necessary, which is most suitable for downsizing.

Further, if the feeding points are provided near the centers of the first and second grid array antenna elements, respectively, it is possible to easily feed power by the coaxial line connected to each feeding point.
Furthermore, by connecting a probe to each feeding point and projecting the probe into the circular or rectangular waveguide, it is possible to easily perform feeding using the circular or rectangular waveguide.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a dual-polarized grid array antenna according to the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of a dual-polarization grid array antenna according to the present invention. In this figure, 10
Is a common ground flat plate which is a conductor plate of metal or the like, and a horizontal polarization grid array antenna element 11 and a vertical polarization grid array antenna element 12 are parallel to the common ground flat plate 10 on one side of the common ground flat plate 10. And are arranged at different heights so as to form a right angle with each other. That is, the horizontally polarized grid array antenna element 11 is arranged on the first plane parallel and close to the common ground flat plate 10, and the horizontally polarized wave is arranged on the second plane parallel and close to the first plane. A vertically polarized grid array antenna element 12 is provided so as to be orthogonally stacked on the grid array antenna element 11 for vertical polarization. Here, as shown in FIG. 2, the height of the horizontally polarized grid array antenna element 11 from the common ground plate 10 is the average height H of the horizontally polarized and vertically polarized grid array antenna elements 11 and 12.
_The height H _{1 is} lower by P / 2 than ₀ (H ₁ = H ₀ −P / 2), and the height of the vertically polarized grid array antenna element 12 from the common ground plate 10 is lower than H ₀ . Also has a height H ₂ (H ₂ = H ₀ + P / 2) which is higher by P / 2. The difference in height between the horizontally polarized and vertically polarized grid array antenna elements 11 and 12 is P.

The configuration of the horizontal polarization and vertical polarization grid array antenna elements 11 and 12 itself is the same as that shown in the conventional example of FIG. A grid array antenna element for horizontal polarization and vertical polarization so that the area of the common ground plate 10 that requires a larger area than the arrangement area of each element 11 and 12 is required. Center position of 11 and 12 (Grid cell 2
(The positions where the long-side direction and the short-side direction are symmetrical) are substantially overlapped with each other.
A feeding point F ₁ is provided near the center of the horizontally polarized grid array antenna element 11, and a feeding point F ₂ is provided near the center of the vertically polarized grid array antenna element 12. In the case of FIG. 1, the number of the short sides S arranged in the direction parallel to the short sides of both the horizontally polarized and vertically polarized grid array antenna elements 11 and 12 is 9, and the number of the arranged short sides S in the direction parallel to the long sides is small. The number of the short sides S arranged is also nine.

FIGS. 3 and 4 show the structure of the feeding portion in the first embodiment, that is, the connection structure of the coaxial line to the feeding points of the grid array antenna elements 11 and 12. Here, the inner conductors (core wires) 13a and 14 of the coaxial wires 13 and 14 are provided at the pair of feeding ends a and b of the feeding point F ₁ of the horizontally polarized grid array antenna element 11, respectively.
a is connected, and the outer conductor (sheath) of the coaxial lines 13 and 14 1
3b and 14b are connected to a common ground flat plate 10 through which coaxial lines 13 and 14 pass, respectively. Similarly, the feed point F of the vertically polarized grid array antenna element 12
The inner conductors (core wires) 15a and 16a of the coaxial wires 15 and 16 are connected to the pair of power feeding ends c and d of ₂ , and the coaxial wires 15 and 1 are connected.
The outer conductors (outer jackets) 15b and 16b of 6 are connected to a common ground plate 10 through which the coaxial lines 15 and 16 pass. The internal conductor lead-out ends a ′ and b ′ of the coaxial lines 13 and 14 must have a phase difference of 180 °, and similarly, the internal conductor lead-out ends c ′ and d ′ of the coaxial lines 15 and 16 must be the same.
It is necessary to have a phase difference of 180 degrees between them. In the present embodiment, for example, a 180-degree phase type distributor may be connected to the lead-out ends a ′ and b ′ of the coaxial lines 13 and 14, and the coaxial lines 15 and
The same applies to the 16 lead-out ends c ′ and d ′. Also, the length of the coaxial line may be changed to obtain a phase difference of 180 degrees. In addition, the common ground plane plate 10 and the grid array antenna element 1 for horizontal polarization and vertical polarization
The distance between 1 and 12 is sufficiently short for the wavelength that
It can be pulled out with the bare wire, that is, the inner conductor of the coaxial wire exposed.

Each grid array antenna element 1
In 1 and 12, it is the short side S that effectively functions as an antenna array. Therefore, the short side S of the grid cell 2 of the horizontally polarized grid array antenna element 11 is arranged in the horizontal direction, and the vertically polarized wave is obtained. By arranging the short side S of the grid cell 2 of the grid array antenna element 12 for use in the vertical direction, the grid array antenna element for horizontal polarization composed of the grid array antenna element for horizontal polarization 11 and the common ground flat plate 10 is horizontally arranged. A vertically polarized grid array antenna element 12 for polarized waves
Vertically polarized radio waves can be respectively transmitted and received by the vertically polarized grid array antenna section including the common ground plate 10.

The horizontal polarization grid array antenna element 11 and the vertical polarization grid array antenna element 12 may be supported at a predetermined height by spacer members at a plurality of positions with respect to the common ground flat plate 10.

Here, as shown in FIG. 1, the X, Y, and Z axes are defined, the rotation angle in the XY plane parallel to the common ground flat plate 10 is φ, and the inclination angle with respect to the Z axis perpendicular to the common ground flat plate 10 is θ. To do. FIG. 5 (A) is a radiation pattern of a horizontally polarized grid array antenna section composed of the horizontally polarized grid array antenna element 11 and the common ground flat plate 10, and θ in a φ = 90 degree plane (YZ plane). Is the case where is changed by ± 90 degrees. FIG. 2B is a radiation pattern of a vertically polarized grid array antenna section composed of the vertically polarized grid array antenna element 12 and the common ground plate 10, where φ = 0 degree plane (X−
This is the case where θ is changed by ± 90 degrees in the Z plane). However,
Both the horizontally polarized and vertically polarized grid array antenna elements 11 and 12 have a short side S in a direction parallel to the short side.
Is the data when the number of arrangement of the short side S in the direction parallel to the long side is 5, and the frequency of the radio wave is 12.625 GHz (wavelength λ = 23.762 mm),
Long side L = 1.053λ, short side S = 0.527λ, H ₀ = 0.
09λ, H ₁ = 0.08λ, and H ₂ = 0.10λ. It can be seen from FIGS. 5A and 5B that a sharp radiation beam is formed in a single direction (Z direction) for both horizontal and vertical polarizations. Further, the cross polarization component is -30 dB or less, which is extremely small, and the adverse effect of arranging the horizontally polarized and vertically polarized grid array antenna elements 11 and 12 with a slight height difference can be almost ignored.

FIG. 6 shows the radiation pattern characteristics when the length of the short side S of the grid cell is changed. However, in the measurement of the radiation pattern of FIG. 6, one grid array antenna element (the number of the short sides S in the direction parallel to the short side is 9 is arranged on the ground plate, and the short side in the direction parallel to the long side is arranged. Although the number of arranged sides S is 5), the radiation pattern can be considered to be almost the same in this embodiment having two grid array antenna elements. In FIG. 6, (A) is S = 0.36λ, (B) is S = 0.45λ,
(C) is S = 0.54λ, (D) is S = 0.63λ,
(E) is the case of S = 0.72λ, and the height of the grid array antenna element from the ground plate is 0.1.
It was set to λ. The long side L is selected to be 1.08λ. From these figures, when S is 0.54λ and S = L / 2,
As shown in FIG. 6C, it can be seen that the radiation beam forms a sharp single beam in the direction normal to the arrangement plane of the grid array antenna elements, and it can be seen that the radiation beam is disturbed as the condition is deviated from. .

As described above, if S is near 0.5λ and S is near L / 2, a good radiation beam can be obtained, but if S is 0.45λ ≦ S ≦ 0.6λ. A beam close to a single beam can be obtained, and the antenna directivity and gain characteristics can be sufficiently satisfied. S is 0.45λ ≦ S ≦
If it deviates from the range of 0.6λ, the radiation pattern becomes a pattern divided into two directions, which is not preferable. Further, the long side L of the grid cell is assumed to be constant under the measurement conditions of FIG.
Actually, the dimension of the long side is changed along with the dimension change of the short side S,
It is more preferable to set the size to about twice the short side, and it has been found that good characteristics can be obtained.

The heights H ₁ and H _{2 of the} grid array antenna elements 11 and 12 from the ground plate 10 are as follows.
Fluctuations have a relatively small effect on the radiation pattern,
The heights H ₁ and H ₂ are both λ with respect to the ground flat plate 10.
It is necessary that the height is lower than / 2. That is,
When the height is λ / 2 or more, the distance between each grid array antenna element and the ground plate is too large, and the radio waves reflected by the ground plate adversely affect. Preferably, each grid array antenna element 11, 12
The height from the ground plate 10 is 0.5 λ or more and 0.5
Set lower than λ. If the height of the grid array antenna element is lower than 0.05λ, the common ground plate 1
It is not preferable because the deterioration of the antenna characteristics due to 0 being too close cannot be ignored.

Even if the height difference P between the horizontally polarized grid array antenna element 11 and the vertically polarized grid array antenna element 12 is slightly changed, the radiation pattern characteristics are not significantly affected. In order to satisfy the uniformity of the radiation pattern and the uniformity of the frequency characteristics for the horizontal polarization and the vertical polarization to some extent, the height difference P is 0.
It is desirable to set the range of 02λ ≦ P ≦ 0.06λ.
Outside this range, the difference in the radiation pattern and frequency characteristics between the horizontal polarization and the vertical polarization increases.

FIG. 7 shows a second embodiment of the present invention. In this case, a horizontal polarization grid array antenna element 21 by printed wiring is provided on the lower surface (side closer to the common ground flat plate 10) of the resin substrate (dielectric flat plate) 20, and a vertically polarized grid array antenna element by printed wiring is provided on the upper surface. 22 are formed respectively. The resin plate 20 is used as the common ground plate 10 so that the horizontally polarized grid array antenna element 21 has an appropriate height H _1.
It is attached in parallel with a spacer or the like (not shown).

Feeding points are provided near the centers of the horizontally polarized and vertically polarized grid array antenna elements 21 and 22, respectively. As in the case of the first embodiment, the feeding portions shown in FIGS. 3 and 4 are provided. The structure of can be adopted.

In the case of the second embodiment, the grid array antenna element for horizontal polarization and vertical polarization can be easily formed by etching the respective surfaces of the resin substrate 20 having both sides provided with metal foil such as copper foil. 21 and 22 can be formed, and both elements 21 and 22 can be reliably insulated and set to the constant interval P. The rest of the configuration, operation and effect are the same as in the first embodiment.

When power is fed to the feeding point of each grid array antenna element using a coaxial line, for example, as shown in FIG.
As described above, the inner conductors (core wires) 13 of the coaxial wires 13 and 14 that penetrate the common ground flat plate 10 and project from the pair of feed ends a and b of the grid array antenna element.
It is also possible to connect a and 14a and connect the outer conductors (jackets) 13b and 14b of the coaxial lines 13 and 14 to the common ground flat plate 10. That is, the coaxial wire may penetrate the common ground flat plate 10 and protrude from the common ground flat plate 10,
It may be a structure in which only the core wire extends without connecting and is connected to the power supply end.

In FIGS. 9 and 10, each grid array antenna element 1 is constructed by using a TE ₁₁ mode circular waveguide (end reflector type) in place of the feeding part using the coaxial line.
The case where power is supplied to 1, 12 (or 21, 22) power supply points is shown. As shown in these drawings, the feed ends a and b of the horizontally polarized grid array antenna element 11 (or 21) are connected to the probes 31a and 31b protruding inside the circular waveguide 30 so as to face each other. And vertically polarized grid array antenna element 12 (or 22)
Are connected to the probes 31c and 31d protruding into the waveguide 30 so as to face each other in a direction orthogonal to the probes 31a and 31b.

By connecting a polarization demultiplexer to the other end of the circular waveguide, a horizontal polarization component and a vertical polarization component can be separated.

In each of the above embodiments, the common ground flat plate 10 is used.
Horizontally polarized grid array antenna elements were arranged in close proximity to each other, and vertically polarized grid array antenna elements were arranged above them. The upper and lower relationships with and may be reversed.

Further, instead of the circular waveguide shown in FIGS. 9 and 10, a square waveguide having a square cross section (of the end reflector type) is used.
May be used.

Although the embodiment of the present invention has been described above, it is obvious to those skilled in the art that the present invention is not limited to this and various modifications and changes can be made within the scope of the claims. Let's do it.

[0043]

As described above, according to the dual-polarization grid array antenna of the present invention, the following effects can be obtained.

(1) Since the common ground plate can be shared by the first and second grid array antenna elements, 1
Both the horizontally polarized wave and the vertically polarized wave can be transmitted and received with the antenna area equivalent to the unit. Therefore, there are advantages that the external dimensions can be reduced and the antenna installation area can be reduced.

(2) The horizontally polarized grid array antenna element and the common ground plate constitute a horizontally polarized grid array antenna section, and the vertically polarized grid array antenna element and the common ground plate also vertically polarize. Since the grid array antenna unit for use can be configured, a 90-degree rotation mechanism for switching between horizontal polarization and vertical polarization is not necessary. Therefore, the structure is simple and the cost can be reduced.

(3) The horizontal polarization grid array antenna element and the vertical polarization grid array antenna element have a structure close to each other, but the mutual influence of the components of the horizontal polarization and the vertical polarization is small. There is almost no deterioration in cross polarization characteristics.

(4) By appropriately setting the short side and long side dimensions of the grid cell of each grid array antenna element with respect to the wavelength of the radio wave, the common ground plate is provided with the common side on the side where the grid array antenna element is provided. It is possible to form a sharp single radiation beam directed in the normal direction of the ground plane, and to improve the antenna directivity characteristics and gain characteristics.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a dual-polarization grid array antenna according to the present invention.

FIG. 2 is a partial cross-sectional view illustrating the height of each grid array antenna element from the common ground plate in the first embodiment.

FIG. 3 is a perspective view showing a structure of a power feeding unit in the first embodiment.

FIG. 4 is a partial cross-sectional view showing the structure of a power feeding unit in the first embodiment.

FIG. 5 is a pattern diagram showing a radiation pattern characteristic in the first embodiment.

FIG. 6 is a pattern diagram showing a radiation pattern when the length dimension of the short side S of the grid cell is changed in the grid array antenna as in the first embodiment.

FIG. 7 is a perspective view showing a second embodiment of the present invention.

FIG. 8 is a partial cross-sectional view showing a configuration example of a power feeding unit applicable to the first and second embodiments.

FIG. 9 is a perspective view showing another configuration example of a power feeding unit applicable to the first and second embodiments.

FIG. 10 is a front sectional view of the same.

FIG. 11 is a perspective view of a conventional grid array antenna.

[Explanation of symbols]

1 Ground Flat Plate 2 Grid Cell 3 Grid Array Antenna Element 10 Common Ground Flat Plate 11,21 Horizontally Polarized Grid Array Antenna Element 12,22 Vertically Polarized Grid Array Antenna Element 13,14,15,16 Coaxial Line 20 Resin Substrate 30 Circular waveguide L long side S short side

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junji Yamauchi 3-11-26 Kaninami-cho, Koganei-shi, Tokyo (72) Inventor Noritaka Misawa 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDK Corporation

Claims (5)

[Claims] 1. A common ground plate, a first grid array antenna element on a first plane parallel and close to the common ground plate, and a second plane parallel and close to the first plane. A polarization-combined grid array antenna, comprising: a second grid array antenna element that is positioned and overlaps the first grid array antenna element in an orthogonal state. 2. When the short side of the grid cell of each grid array antenna element is S, the long side is L, and the wavelength of the radio wave is λ, 0.45λ ≦ S ≦ 0.6λ, and the long side L is short. The dual-polarization grid array antenna according to claim 1, wherein the grid array antenna is set to approximately twice the side S. 3. The polarization-combining grid array antenna according to claim 1, wherein the first and second grid array antenna elements are stacked so that their center positions substantially coincide with each other. 4. The polarization-combined grid array antenna according to claim 1, wherein a feeding point is provided near the center of each of the first and second grid array antenna elements, and a coaxial line is fed to each feeding point. . 5. A feed point is provided in the vicinity of the center of each of the first and second grid array antenna elements, and a probe connected to each feed point is projected into a circular or rectangular waveguide, and the circular or rectangular waveguide is provided. Power is supplied by a wave tube.
The polarized wave dual-use grid array antenna according to 2 or 3.