JP2013106301A - Waveguide slot array antenna device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit/receive orthogonal two polarized waves without generating a grating lobe within a visible domain.SOLUTION: A waveguide slot array antenna device comprises a first waveguide slot array antenna 1 and a second waveguide slot array antenna 2. The first waveguide slot array antenna 1 includes a plurality of first waveguides 11 which are rectangular hollow waveguides and disposed approximately in parallel and shunt type first slots 12 which are disposed in a zigzag manner at intervals of an approximately 1/2 guide wavelength along a tube axis direction on one wide surfaces of the first waveguides 11. The second waveguide slot array antenna 2 includes a plurality of second waveguides 21 which are rectangular hollow waveguides and disposed approximately in parallel and shunt type second slots 22a, 22b which are disposed in the zigzag manner at intervals of the approximately 1/2 guide wavelength along the tube axis direction on both wide surfaces of the second waveguides 21 while being confronted on both the wide surfaces. A narrow surface of each second waveguide 21 is disposed between the corresponding first slots 12 on first slot forming planes of the first waveguides 11 approximately orthogonally to the tube axis direction of the first waveguides 11.

Description

  The present invention relates to a waveguide slot array antenna apparatus that is used for applications such as radar and communication, and more particularly to a waveguide slot array antenna apparatus that enables transmission and reception of two orthogonally polarized waves.

As a low-loss antenna even in a high frequency band such as a microwave and a millimeter wave, a waveguide slot array antenna can be mentioned.
On the other hand, polarization multiplexing technology is one of the methods for satisfying the demand for high speed and large capacity in communication applications. In this case, the antenna is required to be able to transmit and receive two orthogonal polarized waves simultaneously.

  Thus, waveguide slot array antennas that can simultaneously transmit and receive two orthogonal polarized waves include those disclosed in Patent Documents 1 and 2. In the waveguide slot array antenna disclosed in Patent Documents 1 and 2, a waveguide slot array having a plurality of shunt-type slots extending in the tube axis direction of the waveguide, and extending in the tube width direction of the waveguide Waveguide slot arrays having a plurality of series-type slots are alternately arranged adjacent to each other. As a result, transmission and reception of orthogonally polarized waves can be performed as a whole antenna.

Japanese Patent Laid-Open No. 5-48323 JP 2003-318648 A

  In the waveguide slot array antenna disclosed in Patent Documents 1 and 2, shunt-type slots are arranged at a wavelength interval within one tube of the waveguide. When this antenna is constituted by a hollow waveguide, the in-tube wavelength of the waveguide becomes longer than the free space wavelength, and therefore the arrangement interval of the shunt-type slots becomes one free space wavelength or more. Therefore, the radiation pattern on the surface including the tube axis of the waveguide causes a grating lobe.

  Therefore, in Patent Document 1, the waveguide is filled with a dielectric material, and the occurrence of grating lobes is avoided by reducing the slot interval by utilizing the wavelength shortening effect of the dielectric material. However, it is difficult in manufacturing to fill the waveguide with a dielectric material without any problem, and there is a problem that the manufacturing cost increases.

  Further, in Patent Document 2, it is assumed that a dielectric material is not filled, and that a grating lobe is allowed to be used and used within a limited viewing angle. However, the generation of the grating lobe is not preferable because it causes a decrease in antenna gain and may cause problems such as interference with other electronic devices.

  The present invention has been made to solve the above-described problems, and provides a waveguide slot array antenna device that enables transmission and reception of two orthogonally polarized waves without generating a grating lobe in the visible region. It is intended to provide.

  A waveguide slot array antenna device according to the present invention is a rectangular hollow waveguide, and includes a plurality of first waveguides arranged substantially in parallel, and one wide of the first waveguides. A first waveguide slot array antenna having shunt-type first slots arranged in a staggered manner at intervals of approximately ½ in-tube wavelength along the tube axis direction, and a rectangular hollow waveguide A plurality of second waveguides arranged substantially in parallel with each other and the wide surfaces of both of the second waveguides at a distance of about 1/2 in-tube wavelength along the tube axis direction. And a second waveguide slot array antenna having shunt-type second slots arranged in a staggered manner opposite to each other, and the narrow surface of each second waveguide is connected to each first waveguide. Between the first slots on the first slot forming surface of the first waveguide, substantially perpendicular to the tube axis direction of the first waveguide. It is one that is location.

  According to the present invention, since it is configured as described above, it is possible to transmit and receive two orthogonal polarized waves without generating a grating lobe in the visible region.

It is a schematic diagram which shows the structure of the waveguide slot array antenna apparatus which concerns on Embodiment 1 of this invention. It is an exploded view which shows the structure of the 1st waveguide slot array antenna in Embodiment 1 of this invention. It is an exploded view which shows the structure of the 2nd waveguide slot array antenna in Embodiment 1 of this invention. It is the side view seen from the + y direction side which shows the structure of the waveguide slot array antenna apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing seen from the longitudinal direction explaining the polarization plane direction by the 2nd waveguide slot array antenna in Embodiment 1 of this invention. It is a schematic diagram which shows another structure of the waveguide slot array antenna apparatus which concerns on Embodiment 1 of this invention. It is an exploded view which shows another structure of the 1st waveguide slot array antenna in Embodiment 1 of this invention. It is a schematic diagram which shows the structure of the waveguide slot array antenna apparatus which concerns on Embodiment 2 of this invention. It is A-A 'line sectional drawing of FIG. It is a schematic diagram which shows another structure of the waveguide slot array antenna apparatus which concerns on Embodiment 2 of this invention. It is B-B 'sectional view taken on the line of FIG. It is a schematic diagram which shows the structure of the waveguide slot array antenna apparatus which concerns on Embodiment 3 of this invention. It is an exploded view which shows the structure of the 1st waveguide slot array antenna in Embodiment 3 of this invention. It is an exploded view which shows the structure of the 2nd waveguide slot array antenna in Embodiment 3 of this invention. It is an exploded view which shows another structure of the 2nd waveguide slot array antenna in Embodiment 3 of this invention. It is a schematic diagram which shows the structure of the waveguide slot array antenna apparatus which concerns on Embodiment 4 of this invention. FIG. 17 is a sectional view taken along line C-C ′ of FIG. 16.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a schematic diagram showing the configuration of a waveguide slot array antenna device according to Embodiment 1 of the present invention, and FIG. 2 is an exploded view showing only the configuration of the first waveguide slot array antenna 1. FIG. 3 is an exploded view showing only the configuration of the second waveguide slot array antenna 2.
As shown in FIG. 1, the waveguide slot array antenna apparatus includes a first waveguide slot array antenna 1 and a second waveguide slot array antenna 2.

As shown in FIGS. 1 and 2, the first waveguide slot array antenna 1 is a rectangular hollow waveguide, and includes a plurality of first waveguides 11 arranged substantially in parallel. .
A plurality of first slots 12 are formed on one wide surface (the upper surface shown in FIGS. 1 and 2) of the first waveguide 11. The first slot 12 is a shunt-type slot whose longitudinal direction is substantially the same as the tube axis direction of the first waveguide 11. Further, the arrangement interval of the first slots 12 is approximately ½ of the in-tube wavelength of the first waveguide 11, and the slots 12 adjacent to each other in the tube axis direction are wide in the first waveguide 11. The positions are alternately opposite to the center line of the surface, i.e., staggered.
In addition, a power feeding unit 13 is provided at one end of the first waveguide 11.

As shown in FIGS. 1 and 3, the second waveguide slot array antenna 2 is a rectangular hollow waveguide and includes a plurality of second waveguides 21 arranged substantially in parallel. .
A plurality of second slots 22a are formed on one wide surface (the right side surface shown in FIGS. 1 and 3) of the second waveguide 21, and the other wide surface (the left side surface shown in FIGS. 1 and 3). ) Has a plurality of second slots 22b. The second slots 22 a and 22 b are shunt type slots whose longitudinal direction is substantially the same as the tube axis direction of the second waveguide 21. In addition, the arrangement interval of the second slots 22a and 22b is approximately ½ of the in-tube wavelength of the second waveguide 21, and the slots 22a and 22b adjacent in the tube axis direction are in the second waveguide. The tubes 21 are alternately arranged at opposite positions with respect to the center line of the wide surface, that is, in a staggered manner. Further, the second slot 22a and the second slot 22b facing each other at the same position in the tube axis direction of the second waveguide 21 are formed on the wide surface of the second waveguide 21, as shown in FIG. Shifted in the same direction with respect to the center line.
Note that the positions of the second slot 22a and the second slot 22b may or may not be shifted as shown in FIG. Similarly, the sizes of the second slot 22a and the second slot 22b may be changed as shown in FIG. 4 or may be the same. In FIG. 4, three first slots 12 are shown instead of two in order to give generality to the slot arrangement.
In addition, a power feeding unit 23 is provided at the end of the second waveguide 21.

  In the first and second waveguide slot array antennas 1 and 2, the reason why the adjacent first slots 12 and the second slots 22a and 22b are arranged in a staggered manner is that the two adjacent slots 12 (22a, 22b) is different in position in the tube width direction, and excitation is performed in the same phase even if the distance in the tube axis direction of the two slots 12 (22a, 22b) is shorter than the wavelength in one tube of the waveguide 11 (21). This is to make it possible.

As shown in FIG. 1, the narrow surface (the bottom surface shown in FIG. 1) of each second waveguide 21 is on the first slot forming surface of each first waveguide 11 (in FIG. 1). Between the first slots 12 on the upper surface shown), the first waveguides 11 are arranged substantially orthogonal to the tube axis direction of the first waveguide 11. Further, the first waveguide 11 and the second waveguide 21 are arranged while maintaining isolation.
In the following, for convenience, the tube axis direction of the first waveguide 11 is the x direction, the tube axis direction of the second waveguide 21 is the y direction, and the first slot forming surface of the first waveguide 11 is used. The normal direction of is the z direction. The z direction is the main radiation direction of the antenna.

Next, effects of the waveguide slot array antenna apparatus configured as described above will be described.
In the waveguide slot array antenna, since an electric field is generated in the width direction of the slot, the plane of polarization of the antenna is in a direction perpendicular to the tube axis. That is, in the first waveguide slot array antenna 1, the plane of polarization of the antenna is in the x-axis direction.

On the other hand, in the second waveguide slot array antenna 2, an electric field as shown in FIG. 5 is formed. FIG. 5 is a yz cross-sectional view of the waveguide slot array antenna device. A dotted arrow indicates an instantaneous state of a current flowing in the second waveguide 21, and a broken arrow indicates a state of an electric field at this time. Yes. In FIG. 5, for simplification, the positions and sizes of the second slot 22a and the second slot 22b are matched.
Also in the second waveguide slot array antenna 2, the electric field in the vicinity of the second slots 22a and 22b is in the width direction of the second slots 22a and 22b. However, as shown in FIG. 5, electric fields having opposite phases are formed at locations where the wide surfaces of the adjacent second waveguides 21 face each other. Therefore, by combining these electric fields, in the second waveguide slot array antenna 2, the plane of polarization of the antenna is in the y-axis direction.
As described above, the first waveguide slot array antenna 1 and the second waveguide slot array antenna 2 can transmit and receive two polarized waves orthogonal to each other.

  In addition, as described above, the arrangement interval between the first slot 12 and the second slots 22a and 22b is set to the substantially ½ in-tube wavelength of the first and second waveguides 11 and 21, so the first and second Even when the waveguides 11 and 21 are hollow waveguides, the arrangement interval is usually equal to or less than the free space wavelength. For this reason, the first and second waveguide slot array antennas 1 and 2 do not generate grating lobes in the radiation pattern. Therefore, it is possible to avoid problems such as a decrease in antenna gain and interference with other electronic devices due to unnecessary radiation. Further, since it is not necessary to use a process of filling the first and second waveguides 11 and 21 with a dielectric material, there is an advantage that the manufacturing cost of the antenna can be kept low.

  Note that the ends of the first and second waveguides 11 and 21 opposite to the power feeding portions 13 and 23 can be arbitrarily selected according to antenna design requirements such as matching termination and short circuit. In particular, when short-circuiting the end, the distance between the short-circuited end and the center of the slot 12 (22a, 22b) adjacent to the short-circuited end is configured to be approximately an odd multiple of the 1/4 in-tube wavelength. A standing wave that maximizes the current flowing on (22a, 22b) is generated. Thereby, the amount of radiation from the slot 12 (22a, 22b) to the space is maximized, and high antenna efficiency can be realized.

Further, as shown in FIGS. 6 and 7, on the first slot forming surface of the first waveguide 11, the portion facing each first slot 12 across each first waveguide 11. A metal plate 3 having substantially the same type of opening may be installed.
That is, the main radiation direction of the antenna is the + z direction, but in the case of the structure shown in FIG. 1, radio waves leak from the gap between the first waveguides 11, and some radiation is also emitted in the -z direction. It is thought that it will be made. Therefore, there is a concern that the gain of the antenna will decrease. In addition, since a device such as a signal processing circuit is usually installed behind the antenna (−z direction), it is necessary to suppress interference with these electronic devices. Therefore, as shown in FIGS. 6 and 7, by installing the metal plate 3 on the surface on which the first slot 12 is formed, a shielding effect is obtained and the leakage of radio waves to the rear side of the antenna is suppressed. be able to.

  As described above, according to the first embodiment, a plurality of first waveguides 11 that are hollow waveguides and one wide surface of each first waveguide 11 are arranged in the tube axis direction. A first waveguide slot array antenna 1 having shunt-type first slots 12 arranged in a staggered manner at intervals of approximately ½ in-tube wavelength along with a plurality of second waveguides which are hollow waveguides 21 and a shunt-type second arranged in a staggered manner facing both wide surfaces at intervals of approximately ½ in-tube wavelength along the tube axis direction on both wide surfaces of each of the second waveguides 21. A second waveguide slot array antenna 2 having a plurality of slots 22a and 22b, and a narrow surface of each second waveguide 21 is defined as a first slot forming surface of each first waveguide 11. Between the first slots 12 of the first waveguide 11 so as to be substantially orthogonal to the tube axis direction of the first waveguide 11. Since the configuration can not be filled with dielectric material, to allow the transmission and reception of two orthogonal polarized waves without generating grating lobes in the visible region.

Embodiment 2. FIG.
8 is a schematic diagram showing a configuration of a waveguide slot array antenna device according to Embodiment 2 of the present invention, and FIG. 9 is a cross-sectional view taken along line AA ′ of FIG. In FIG. 9, the second waveguide 21 is omitted. The waveguide slot array antenna apparatus according to Embodiment 2 shown in FIG. 8 is obtained by adding a metal block 4 to the waveguide slot array antenna apparatus according to Embodiment 1 shown in FIG. Other configurations are the same, and the same reference numerals are given and description thereof is omitted.

As shown in FIGS. 8 and 9, a plurality of metal blocks 4 are installed on the metal plate 3 so as to fill the gaps between the adjacent first slots 12 and between the adjacent second slots 22a (22b). Is.
By installing the metal block 4, mutual coupling through the space in the electric field plane direction of the first slot 12 and the magnetic field plane direction of the second slots 22a and 22b can be suppressed. Inter-element coupling causes degradation of antenna characteristics such as impedance degradation and pattern shape distortion, and is preferably suppressed as much as possible.

  Then, the adjacent second waveguide 21 and the metal block 4 form an occupied area of the element antenna (slot) (an approximately rectangular area as viewed from the + z direction), so that the element antenna has a shape corresponding to its shape. Gain and beam width can be adjusted.

Further, as shown in FIGS. 10 and 11, a metal block 4 b having a taper in the xz cross section may be used instead of the rectangular parallelepiped metal block 4. In FIG. 11, the second waveguide 21 is omitted.
By freely selecting the taper shape of the metal block 4b, there is an advantage that the design of the gain and beam width of the element antenna becomes easier. In addition, in the metal block 4b shown to FIG. 10, 11, although a taper is a shape narrowed toward + z direction, the shape which expands toward + z direction on the contrary may be sufficient.

  As described above, according to the second embodiment, the metal blocks 4 and 4b are installed so as to fill the gap between the adjacent first slots 12 and between the adjacent second slots 22a (22b). Since it is configured, in addition to the effects in the first embodiment, it is possible to suppress mutual coupling through the space in the electric field plane direction of the first slot 12 and the magnetic field plane direction of the second slots 22a and 22b.

Embodiment 3 FIG.
In the first and second embodiments, the specific power supply structures of the first waveguide 11 and the second waveguide 21 are not clearly shown, and the power supply structures (power supply units 13 and 23) are provided independently. The explanation was given as a premise. On the other hand, the third embodiment shows a configuration in which the power feeding units 13 and 23 of the respective waveguides 11 and 21 are configured to be combined / distributed in whole or in part.

  FIG. 12 shows the first waveguide slot array antenna 1 having a magnetic field surface bend structure and a magnetic field surface branch structure on one end side (feeding side) of the first waveguide 11, and a feeding portion 13 on the end portion. Is provided. Thereby, it is possible to supply power to each first waveguide 11 from one power supply unit 13 and to realize a more compact antenna.

FIG. 13 is a diagram showing another embodiment of the feeding method of the first waveguide slot array antenna 1 and is an exploded view showing only the first waveguide slot array antenna 1. In FIG. 13, both ends of the first waveguide 11 are short-circuited, and the feeding waveguide 6 is provided on the rear side (−z direction) of the antenna. The feeding waveguide 6 is provided with a coupling slot 61. The tube axis direction of the first waveguide 11 and the tube axis direction of the power supply waveguide 6 are substantially orthogonal to each other, and are connected to each other through the coupling slot 61 on the wide surface.
Thus, a more compact antenna can be realized by configuring the power feeding structure on the back surface of the antenna. In FIG. 13, the coupling slot 61 is used as a connection structure between the first waveguide 11 and the feeding waveguide 6. However, the coupling may be performed using a coupling hole such as a substantially rectangular opening.

  On the other hand, FIG. 14 shows that the second waveguide slot array antenna 2 has a field plane bend structure and a field plane branching structure on one end side (feeding side) of the second waveguide 21 and feeds the end portion. A distribution structure 7 having a portion 23 is provided. As a result, power can be supplied from one power supply portion 23 to each second waveguide 21, and a more compact antenna can be realized.

  FIG. 15 is a diagram showing another form of the feeding method of the second waveguide slot array antenna 2. In FIG. 15, a distribution structure 8 having an electric field surface bend structure and a magnetic field surface branch structure and having a power feeding portion 23 at the end is provided on one end side (feeding side) of the second waveguide 21. The magnetic field plane branch structure is bent to the opposite side to the antenna radiation direction. Thereby, connection with the signal processing circuit provided in the antenna back surface can be easily performed.

  As described above, according to the third embodiment, the power feeding sections 13 and 23 of the respective waveguides 11 and 21 are configured to be combined / distributed in whole or in part. In addition, a more compact antenna can be realized.

Embodiment 4 FIG.
16 is a schematic diagram showing the configuration of a waveguide slot array antenna apparatus according to Embodiment 4 of the present invention, and FIG. 17 is a cross-sectional view taken along the line CC ′ of FIG. In FIG. 17, the second waveguide 21 is omitted. In the waveguide slot array antenna apparatus according to Embodiment 4 shown in FIG. 16, a metal grid 9 made of a plurality of metal bodies is added to the waveguide slot array antenna apparatus according to Embodiment 1 shown in FIG. Is. Other configurations are the same, and the same reference numerals are given and description thereof is omitted.

  As shown in FIG. 16, the metal grid 9 is provided between the adjacent second waveguides 21 at a position between the first slot 12 and the second slots 22a and 22b. The metal grid 9 is arranged substantially horizontally with the wide surface of the first waveguide 11. Further, the metal bodies constituting the metal grid 9 are arranged at a sufficiently small interval with respect to the wavelength of the antenna in use, with the longitudinal direction thereof being along the tube axis direction of the first waveguide 11.

Next, effects of the waveguide slot array antenna apparatus configured as described above will be described.
In the first to third embodiments, the second waveguide slot array antenna 2 uses the first slot forming surface of the first waveguide 11 as a reflecting plate, thereby emitting radiation only in the + z direction. Realized. At this time, when the distance between the second slots 22a and 22b and the first slot forming surface of the first waveguide 11 is long (for example, when the distance is about ½ of the free space wavelength), It is possible that the direct wave in the + z direction and the reflected wave from the -z direction are superimposed in opposite phases, and a null is formed in the main lobe of the antenna. Therefore, it is preferable to make the distance as close as possible, but it may be difficult depending on the dimension of the wide surface of the second waveguide 21.

  Therefore, by installing the metal grid 9 at a position close to the second slots 22a and 22b, the phase difference between the direct wave in the + z direction and the reflected wave from the -z direction is reduced, and the above problem is avoided. can do. On the other hand, since the longitudinal direction (y direction) of the metal body forming the metal grid 9 is orthogonal to the polarization direction (x direction) of the first waveguide slot array antenna 1, the first waveguide slot array. There is almost no influence on the antenna 1.

  As described above, according to the fourth embodiment, the first waveguide is positioned between the adjacent second waveguides 21 between the first slot 12 and the second slots 22a and 22b. 11 is provided with a metal grid 9 substantially horizontal to the wide surface, so that in addition to the effects of the first embodiment, the second slots 22a and 22b and the first slot of the first waveguide 11 are provided. Null formation of the main lobe due to a distance from the forming surface can be avoided.

Embodiment 5 FIG.
In the first to fourth embodiments described above, the material configurations inside the first waveguide 11 and the second waveguide 21 are not clearly described, and the description has been made on the assumption of a hollow structure. On the other hand, all or a part of the first waveguide 11 and / or the second waveguide 21 may be filled with a dielectric material. By filling the waveguides 11 and 21 with a dielectric material, an effect of shortening the in-tube wavelengths of the waveguides 11 and 21 can be obtained according to the relative dielectric constant of the dielectric material. Thereby, the element spacing of the first slot 12 and the second slots 22a and 22b can be adjusted, and the degree of freedom in designing the array antenna can be increased.

  In the present invention, within the scope of the invention, any combination of the embodiments, or any modification of any component in each embodiment, or omission of any component in each embodiment is possible. .

  DESCRIPTION OF SYMBOLS 1 1st waveguide slot array antenna, 2nd 2nd waveguide slot array antenna, 3 Metal plate, 4, 4b Metal block, 5, 7, 8 Distribution structure, 6 Feeding waveguide, 9 Metal grid , 11 1st waveguide, 12 1st slot, 13 feeding part, 21 2nd waveguide, 22a, 22b 2nd slot, 23 feeding part, 61 coupling slot.

Claims (13)

A rectangular hollow waveguide, a plurality of first waveguides disposed substantially in parallel, and approximately 1/2 along the tube axis direction on one wide surface of the first waveguide. A first waveguide slot array antenna having shunt-shaped first slots arranged in a staggered manner at intervals of the guide wavelength;
A rectangular hollow waveguide, and a plurality of second waveguides arranged substantially in parallel, and approximately 1/2 along the tube axis direction on the wide surfaces of both of the second waveguides. A second waveguide slot array antenna having shunt-shaped second slots arranged in a staggered manner facing each other on the wide surfaces at intervals of the guide wavelength;
The narrow axis of each second waveguide is between the first slots on the first slot forming surface of each first waveguide, and the tube axis of the first waveguide. A waveguide slot array antenna device, characterized in that the waveguide slot array antenna device is arranged substantially perpendicular to a direction. The waveguide slot array antenna apparatus according to claim 1, wherein ends of the first waveguide and / or the second waveguide are short-circuited. 2. The waveguide slot array antenna apparatus according to claim 1, wherein ends of the first waveguide and / or the second waveguide are matched and terminated. The distance between the short-circuit end of the first waveguide and / or the second waveguide and the center of the first slot and / or the second slot adjacent to the short-circuit end is approximately 1/4. 3. The waveguide slot array antenna device according to claim 2, wherein the waveguide slot array antenna device is an odd multiple of the guide wavelength. On the first slot forming surface of each of the first waveguides, a metal plate having an opening at the portion facing each of the first slots is installed across the first waveguides. The waveguide slot array antenna device according to any one of claims 1 to 4, wherein the waveguide slot array antenna device is provided. The waveguide according to any one of claims 1 to 5, further comprising a metal block that fills a gap between the adjacent first slots and between the adjacent second slots. Tube slot array antenna device. The waveguide slot array antenna apparatus according to claim 6, wherein the metal block has a taper. 8. A distribution structure comprising a magnetic field bend structure and a magnetic field branch structure at one end of each of the first waveguides, and having a power feeding portion at an end. A waveguide slot array antenna device according to any one of the preceding claims. Provided on the first slot non-formation surface of the first waveguide is a feeding waveguide connected through a coupling slot or coupling hole substantially perpendicular to the tube axis direction and having a feeding section at one end. The waveguide slot array antenna apparatus according to claim 1, wherein the waveguide slot array antenna apparatus is provided. 10. The distribution structure having an electric field surface bend structure and an electric field surface branching structure at one end of the second rectangular waveguide and having a power feeding portion at an end portion thereof. A waveguide slot array antenna device according to any one of the preceding claims. One end of the second rectangular waveguide is composed of a field plane bend structure and a magnetic field plane branch structure, and is provided with a distribution structure having a feeding portion at the end,
10. The waveguide slot array antenna device according to claim 1, wherein the magnetic field plane branching structure is bent to the side opposite to the antenna radiation direction. 11. A metal grid that is substantially horizontal to the wide surface of the first waveguide is provided at a position between the first slot and the second slot between the adjacent second waveguides,
The metal bodies constituting the metal grid are arranged at a small interval with respect to the wavelength of the used frequency, with the longitudinal direction being along the tube axis direction of the first waveguide. The waveguide slot array antenna device according to claim 11. The conductor according to any one of claims 1 to 12, wherein a dielectric material is filled in all or part of the first waveguide and / or the second waveguide. Wave tube slot array antenna device.

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