JPH07263905A - Primary radiator - Google Patents

Abstract

PURPOSE:To improve the cross polarization protection ratio by inserting a first probe, which is perpendicularly arranged on a dielectric plate, toward the center of a round waveguide and inserting a second probe inward from the center part of one side of the section of a square waveguide. CONSTITUTION:When a vertically polarized wave having an electric field parallel with the Y-axis direction and a horizontaly polarized wave having an electric field parallel with the X-axis direction are introduced into a round waveguide 2, the vertically polarized wave can be coupled to a probe 3 because the probe is attached in the direction parallel with the Y axis. Since the vertically polarized wave is reflected by a slot 6, it is not outputted to a square waveguide 7. the horizontally polarized wave is introduced into the square waveguide 7 through the slot 6 because the slot 6 is so arranged that its lengthwise direction is parallel with the Y axis, and the horizontally polarized wave is propagated in the square waveguide 7 with the electric field in the X-axis direction. Since a probe 8 is attached in the direction parallel with the X axis, the horizontally polarized wave can be coupled to the probe 8. The horizontally polarized wave and the vertically polarized wave are separated by the slot 6, and thus, the cross polarization protection ratio is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a primary radiator used as a micro receiver.

[0002]

2. Description of the Related Art A conventional primary radiator is as shown in FIG.
A dielectric plate 29 is provided on the outer peripheral portion of the circular waveguide 26 so as to intersect with the circular waveguide 26, and a pair of probes 27 and 28 are provided on the dielectric plate 29 so as to be orthogonal to each other and circular. With respect to the horizontal polarization and the vertical polarization introduced into the circular waveguide 26, the horizontal polarization is coupled to one of the probes and the vertical polarization is applied to the other of the probes. The waves are combined, and one of the inputs from the probes 27 and 28 is selected by the signal processing unit 30 provided on the dielectric plate 29 to extract a desired polarized wave, signal-process it, and receive it. In the case of receiving circularly polarized waves, a circular polarization / linear polarization converter (not shown) is provided inside the circular waveguide 26, and the right-handed polarization introduced into the circular waveguide 26 is provided. The circularly polarized wave and the left-handed circularly polarized wave are converted into linearly polarized waves having electric fields in directions orthogonal to each other by the circularly polarized wave / linearly polarized wave converter, and one of the converted linearly polarized waves is applied to the probe 27. The other of the linearly polarized waves is coupled to the probe 28, and the signal processing unit 30 selects one of the inputs from the probes 27 and 28 to extract a desired polarized wave, perform signal processing, and receive the signal. .

[0003]

Therefore, a pair of probes 27 and 28 are provided on one dielectric plate 29 to take out a desired polarized wave from the circular waveguide 26 for signal processing. It is extremely convenient as a signal processing method. However, since the probes 27 and 28 are arranged close to each other, there is a problem that they interfere with each other and the cross polarization protection ratio deteriorates. INDUSTRIAL APPLICABILITY The present invention improves the cross-polarization protection ratio, and at the same time, primary radiation capable of extracting a desired polarized wave from a circular waveguide with two probes provided on one dielectric plate and processing the signal. The purpose is to provide a container.

[0004]

SUMMARY OF THE INVENTION A primary radiator of the first invention of the present application is a circular waveguide having an opening at one end for introducing radio waves and an end face having a connecting slot at the other end. A tube, a rectangular waveguide connected in a direction orthogonal to the circular waveguide through a connecting slot provided in the terminal surface, and the circular waveguide in a direction intersecting with the rectangular waveguide. A dielectric plate provided on the outer surface of the wave guide, and mounted substantially vertically on the dielectric plate, inserted toward the center of the circular waveguide, and parallel to the longitudinal direction of the slot. A cross section of the arranged first probe and the rectangular waveguide provided on the dielectric plate in a direction parallel to the dielectric plate and parallel to the extended center line of the circular waveguide. And a second probe inserted inside from the central part of one side of It is an feature. The primary radiator of the second invention of the present application is such that a slot provided on an end face of the circular waveguide passes through the center of the end face and about half a wavelength of a radio wave propagating in the circular waveguide in the longitudinal direction of the slot. It is characterized by the length of.

A primary radiator of the third invention of the present application is a circular waveguide having an opening at one end thereof for introducing a radio wave and having a parallel grating plate therein, and the other end of the circular waveguide. A circular / rectangular converter connected to the circular waveguide, and a circular waveguide connected to the opposite side of the connecting portion of the circular / rectangular converter to the circular waveguide, the middle being curved and the tip being an end surface. A rectangular waveguide drawn in an orthogonal direction, a dielectric plate provided on the outer surface of the circular waveguide in a direction intersecting with the rectangular waveguide, and mounted substantially vertically on the dielectric plate. And a first probe inserted toward the center of the circular waveguide,
Inside from the central part of one side of the cross section of the rectangular waveguide which is provided on the dielectric plate in a direction parallel to the dielectric plate and is parallel to the extended center line of the circular waveguide. And a second probe inserted in. In the primary radiator of the fourth invention of the present application, the directions of the parallel grating of the parallel grating plate seen from the opening, the first probe, and the pair of sides of the rectangular opening of the circular / square converter are substantially the same. It is characterized by being arranged in parallel. The primary radiator of the fifth invention of the present application is provided with a circular polarization / linear polarization converter on the opening side in the circular waveguide, and introduces right-handed circular polarization and left-handed circular polarization from the opening. , One of the linear polarizations converted by the circular polarization / linear polarization converter is coupled to the first probe, and the other of the linear polarizations converted by the circular polarization / linear polarization converter is It is characterized in that it is bound to the second probe.

[0006]

In the first invention of the present application, the rectangular waveguide is connected in the direction orthogonal to the circular waveguide through the connecting slot provided on the end surface of the circular waveguide, and the dielectric plate is formed as described above. Provided on the outer surface of the circular waveguide in a direction intersecting with the rectangular waveguide,
A first probe mounted substantially vertically on the dielectric plate is inserted toward the center of the circular waveguide, and a second probe provided on the dielectric plate is oriented parallel to the dielectric plate. A probe is inserted from the center of one side of the cross section of the rectangular waveguide parallel to the extended center line of the circular waveguide, and the longitudinal direction of the slot is defined as the first probe. With respect to horizontal polarized waves and vertical polarized waves that are arranged in parallel and have electric fields in mutually orthogonal directions introduced into the circular waveguide, one of the polarized waves is reflected by the slot and Since it is coupled to the probe and the other polarized wave is passed through the slot and introduced into the rectangular waveguide to be coupled to the second probe, the cross polarization protection ratio is improved and Circular waveguide with two probes on the dielectric plate It is possible to signal processing from the inner retrieve the desired polarization.

In the second invention of the present application, the slot provided with the end face of the circular waveguide passes through the center of the end face, and about half a wavelength of the radio wave propagating in the circular waveguide in the longitudinal direction of the slot. The cross polarization against the polarization coupled to the first probe is prevented from being reflected by the slot and can be efficiently output to the rectangular waveguide to improve the cross polarization protection ratio. It becomes possible. According to the third invention of the present application, with respect to the horizontal polarization and the vertical polarization introduced into the circular waveguide, one polarization is reflected by the parallel grating plate so as to be coupled to the first probe and the rectangular polarization. The other polarized wave is prevented from traveling toward the waveguide, and the other polarized wave passes through the parallel grating plate and is introduced into the rectangular waveguide through the circular / square converter to be coupled to the second probe. Therefore, it becomes possible to improve the cross polarization protection ratio and to take out desired polarization from the circular waveguide with two probes provided on one dielectric plate and perform signal processing.

In the fourth invention of the present application, the directions of the parallel grating of the parallel grating plate seen from the opening of the circular waveguide, the first probe, and the pair of sides of the rectangular opening of the circular / square converter are set. Since they are arranged so as to be substantially parallel to each other, one polarized wave is reflected by the parallel grating plate so that it is efficiently coupled to the first probe and does not travel toward the rectangular waveguide, while the other polarized wave is polarized. The wave passes through the parallel grating plate and is introduced into the rectangular waveguide so that it can be efficiently coupled to the second probe, and the separation of both polarizations is improved, so the cross polarization protection ratio is improved. It becomes possible to improve. In the fifth invention of the present application, a circular polarization / linear polarization converter is provided on the opening side, and with respect to the right-handed circular polarization and the left-handed circular polarization introduced into the circular waveguide, A circular polarization / linear polarization converter can be used to convert linear polarizations that intersect each other. One of the converted linear polarizations is coupled to the first probe, and the other is inserted in the rectangular waveguide. It can be introduced and coupled to the second probe, and like the first and third inventions of the present application, it improves the cross polarization protection ratio and is provided on a single dielectric plate. It is possible to take out a desired polarized wave from the circular waveguide with one probe and process the signal.

[0009]

FIG. 1 is a partially cutaway perspective view of a primary radiator showing a first embodiment of the present invention. In the figure, the vertical direction is the Y axis and the horizontal direction is the X axis (hereinafter the same in FIGS. 2 to 5). The circular waveguide 2 is provided with an opening 1 at one end thereof for allowing radio waves to be introduced therein, and at the other end thereof is provided with a termination surface 5 having a slot 6 for connection, and the circular waveguide 2 is provided outside the termination surface 5.
A rectangular waveguide 7 is connected in a direction orthogonal to the circular waveguide 2, and the circular waveguide 2 and the rectangular waveguide 7 are connected to each other by a slot 6. The slot 6 passes through the center of the terminating surface 5 and has a lengthwise direction of about half a wavelength of the radio wave introduced into the circular waveguide 2. A dielectric plate 9 is provided on the outer surface of the circular waveguide 2, and the dielectric plate 9 and the rectangular waveguide 7 are arranged so as to intersect each other.

The probe 3 is mounted on the dielectric plate 9 substantially vertically, and the through hole 4 provided on the side surface of the circular waveguide 2 is used.
Through the circular waveguide 2 toward the center of the circular waveguide 2 so that the distance between the end face 5 and the probe 3 is about ¼ wavelength of the radio wave introduced into the circular waveguide 2, and 3 is arranged parallel to the longitudinal direction of the slot 6 provided in the terminal surface 5. The rectangular waveguide 7 has a rectangular cross-section capable of propagating TE10 mode radio waves, the short side direction is parallel to the end surface 5, and the long side direction is arranged perpendicular to the end surface 5. With the upper end closed and the lower open,
The slot 6 and the tube axis of the rectangular waveguide 7 are parallel to each other, are located at the center of the side surface of the rectangular waveguide 7, and the upper end of the slot 6 and the closed surface are arranged close to each other. The probe 8 has one end attached to the dielectric plate 9 in a direction parallel to the dielectric plate 9, and the other end inserted vertically from the center of one long side of the cross section of the rectangular waveguide 7 to the inside. There is.

An opening 10 is provided in the dielectric plate 9 in the size of the outer shape of the rectangular waveguide 7, and the probe 8 is arranged so as to project from the opening 10. The probe 8 is electrically connected by using a dielectric. Insulate and apply the rectangular waveguide 7 from the upper part, and apply the rectangular waveguide 11 whose lower end is the end face from the lower part, and measure the length to the end face of the rectangular waveguide 11 in the rectangular waveguide 11. Is set to be about 1/4 wavelength of the propagating radio wave, and the radio wave can be coupled to the probe 8. The rectangular waveguide 7 and the rectangular waveguide 11 have the same inner diameter. It is assumed that vertical polarization having an electric field parallel to the Y-axis direction and horizontal polarization having an electric field parallel to the X-axis direction are introduced into the circular waveguide 2. Since the probe 3 is attached in the direction parallel to the Y axis, it is possible to couple the vertically polarized wave to the probe 3. Further, since the vertically polarized wave is reflected by the slot 6, it is not output to the rectangular waveguide 7.

Since the horizontally polarized wave is arranged so that the longitudinal direction of the slot 6 is parallel to the Y axis, it is introduced into the rectangular waveguide 7 through the slot 6 and has an electric field in the X axis direction. And propagate through the rectangular waveguide 7. Since the probe 8 is attached in a direction parallel to the X axis, horizontal polarization can be coupled to the probe 8. Since the horizontally polarized wave and the vertically polarized wave are separated by the slot 6, the cross polarized wave protection ratio is improved, and at the same time, the probes 3 and 8 provided on the single dielectric plate 9 are used to guide the inside of the circular waveguide 2. It is possible to take out a desired polarized wave from and process the signal.

FIG. 2 is a block diagram of a primary radiator showing a second embodiment of the present invention. In the figure, the same parts as those shown in FIG. Omit it. Figure 2
As shown in (A), a parallel grating plate 14 having a parallel grating in a direction parallel to the probe 13 is provided inside the circular waveguide 12, and the distance between the probe 13 and the parallel grating plate 14 is the probe 13. The peripheral portion is fixed to the inner wall of the circular waveguide 12 so that it has a length of about ¼ wavelength of the radio wave to be coupled to. The circular waveguide 12 is a circular / square converter 15
It is connected to the rectangular waveguide 16 via. The circular / rectangular converter 15 has a length along the tube axis direction of the circular waveguide 12 as a length of about ¼ wavelength of a radio wave propagating in the circular waveguide 12, and as shown in FIG. In addition, metal lumps are bonded to both side surfaces in the horizontal direction of the cross section of the circular waveguide 12 so that the inner side surfaces become parallel surfaces. The rectangular waveguide 16 has a rectangular opening 17 through which TE10 mode radio waves can be propagated. The short side direction is parallel to the X axis, and the short side of the opening 17 is a parallel surface of the circular / square converter 15. The width narrower than the width is joined to the circular / square converter 15. Rectangular waveguide 1
6 is curved so that the open end of the rectangular waveguide 16 is a circular waveguide 1
It is pulled out so as to be orthogonal to 2.

As shown in FIG. 1, a dielectric plate 9 is provided on the outer surface of the circular waveguide 12, and the dielectric plate 9 and the open end of the rectangular waveguide 16 are arranged so as to intersect with each other. The probe 13 is mounted on the dielectric plate 9 substantially vertically, and
Has one end attached to the dielectric plate 9 in a direction parallel to the dielectric plate 9, and the other end of the surface parallel to the extension line of the tube axis of the circular waveguide 12 of the cross section of the rectangular waveguide 16. Inserted vertically from the center to the inside. A rectangular waveguide 16 is provided on the dielectric plate 9.
The opening 10 is provided in the size of the outer shape of the probe, the probe 8 is arranged so as to project from the opening 10, the probe 8 is electrically insulated by using a dielectric, and the rectangular waveguide 16 is applied from above. A rectangular waveguide 11 whose end surface is from the bottom to the bottom is applied, and the length up to the end surface of the rectangular waveguide 11 becomes about 1/4 wavelength of the radio wave propagating in the rectangular waveguide 11. In this way, the same radio wave can be coupled to the probe 8. The rectangular waveguide 16 and the rectangular waveguide 11 have the same inner diameter.

It is assumed that vertical polarization having an electric field parallel to the Y-axis direction and horizontal polarization having an electric field parallel to the X-axis direction are introduced into the circular waveguide 12. Since the probe 13 is attached in a direction parallel to the Y axis, it is possible to couple vertically polarized waves to the probe 13. Further, since the vertically polarized wave is reflected by the parallel grating plate 14, it is not output to the rectangular waveguide 16. For horizontally polarized waves, the parallel grating of the parallel grating plate 14 is Y.
Since it is arranged in a direction parallel to the axis, the parallel grid plate 14
Is introduced into the rectangular waveguide 16 through and is propagated through the rectangular waveguide 16 in a state having an electric field in the X-axis direction.
Since the probe 8 is attached in a direction parallel to the X axis, horizontal polarization can be coupled to the probe 8.
Since the horizontal polarization and the vertical polarization are separated by the parallel grating plate 14, the cross polarization protection ratio is improved, and the circular waveguide is formed by the probes 13 and 8 provided on one dielectric plate 9. It is possible to take out a desired polarized wave from within 12 and perform signal processing.

FIG. 3 is a block diagram of a primary radiator showing a third embodiment of the present invention. In the figure, the same parts as those shown in FIG. Omit it. The difference from the embodiment shown in FIG. 1 is that a circular polarization / linear polarization converter is provided on the opening 1 side of the circular waveguide 2. As shown in FIG. 3 (A), as a circular polarization / linear polarization converter, a semi-cylindrical metal block 18 and 19 is provided at a position where the inner wall portion of the circular waveguide 2 between the opening 1 and the probe 3 faces each other. And the length in the direction along the tube axis of the circular waveguide 2 is set as a length capable of producing a phase difference of ¼ wavelength between the linearly polarized components orthogonal to each other of the circularly polarized wave. The right-handed circular polarization and the left-handed circular polarization introduced into the circular waveguide 2 can be converted into linear polarization.

FIG. 3B shows the circular waveguide 2 taken along the line bb.
FIG. 2 is a cross-sectional view as viewed from above, showing a kamaboko-shaped metal mass 18 and 1.
The center line c connecting the centers of 9 is 45 with respect to the X axis and the Y axis.
The probe 3 is arranged so as to form an angle of degrees.
Is inserted into the circular waveguide 2 so as to face the center of the circular waveguide 2 in a direction parallel to the Y axis, and the longitudinal direction of the slot 6 is also arranged to be parallel to the Y axis. ing. Therefore, assuming that the right-handed circularly polarized wave introduced into the circular waveguide 2 is converted into a linearly polarized wave having an electric field in the X-axis direction by, for example, a circularly polarized wave / linearly polarized wave converter, a left-handed circularly polarized wave is generated. The wave is Y
It is converted into a linearly polarized wave having an electric field in the axial direction.

As described in the embodiment of FIG. 1, linearly polarized waves having an electric field in the Y-axis direction can be coupled to the probe 3, and linearly polarized waves having an electric field in the X-axis direction can be slot 6.
Since the light is output to the rectangular waveguide 7 via, it can be coupled to the probe 8. Therefore, since the polarization converted into the linear polarization by the circular polarization / linear polarization converter is separated by the slot 6 as in the embodiment of FIG. 1, the cross polarization protection ratio is improved and one With the probes 3 and 8 provided on the dielectric plate 9, it is possible to take out a desired polarized wave from the circular waveguide 2 and perform signal processing.

FIG. 4 is a block diagram of a primary radiator showing a fourth embodiment of the present invention. In the figure, the same parts as those shown in FIG. Omit it. The difference from the embodiment of FIG. 3 is that a dielectric plate 21 is used as a circular polarization / linear polarization converter. As shown in FIG. 4 (A), the dielectric plate 21 is formed in the circular waveguide 2 between the opening 1 and the probe 3.
And the length in the direction along the tube axis of the circular waveguide 2 is set to 1/4 between the orthogonal linearly polarized components of circularly polarized waves.
As a length capable of producing a phase difference in wavelength, the right-handed circular polarization and the left-handed circular polarization introduced into the circular waveguide 2 can be converted into linear polarization. FIG. 4B is a cross-sectional view of the circular waveguide 2 taken along the section line d-d, and the dielectric plate 21 is arranged so as to form an angle of 45 degrees with respect to the X axis and the Y axis. Further, the probe 3 is inserted into the circular waveguide 2 so as to face the center of the circular waveguide 2 in a direction parallel to the Y axis, and the longitudinal direction of the slot 6 is also Y.
It is arranged in a direction parallel to the axis. Therefore, assuming that the right-handed circularly polarized wave introduced into the circular waveguide 2 is converted into a linearly polarized wave having an electric field in the X-axis direction by, for example, a circularly polarized wave / linearly polarized wave converter, a left-handed circularly polarized wave is generated. The waves are converted into linearly polarized waves having an electric field in the Y-axis direction, and the respective polarized waves can be taken out from the probe 3 and the probe 8 as in the embodiment of FIG. 3, and the same effect as that of the embodiment of FIG. 3 can be obtained. Can be demonstrated.

FIG. 5 is a partially cutaway perspective view of a primary radiator showing a fifth embodiment of the present invention. In the figure, the same parts as those shown in FIG. And the description is omitted. The difference from the embodiment shown in FIG. 2 is that a circular polarization / linear polarization converter is provided on the opening 1 side of the circular waveguide 2. As a circular polarization / linear polarization converter, kamaboko-shaped metal blocks 18 and 19 are attached to the inner wall portion of the circular waveguide 12 between the opening 1 and the probe 13 so as to face each other. The length in the direction along the tube axis of was introduced into the circular waveguide 12 as a length capable of producing a phase difference of ¼ wavelength between the linear polarization components of the circular polarization orthogonal to each other. Right-hand circular polarization and left-hand circular polarization can be converted into linear polarization.

The operation of the semi-cylindrical metal masses 18 and 19 is similar to that of the embodiment of FIG. 3, and by the action of the semi-cylindrical metal masses 18 and 19, for example, a right-handed circle introduced into the circular waveguide 12. If the polarized wave is converted into a linear polarized wave having an electric field in the X-axis direction, the left-handed circular polarized wave is converted into a linear polarized wave having an electric field in the Y-axis direction. As described in the embodiment of FIG. 2, the linearly polarized wave having the electric field in the Y-axis direction has
Since the linearly polarized wave having an electric field in the X-axis direction passes through the parallel grating plate 14 and is output to the rectangular waveguide 16, it can be coupled to the probe 8. Therefore, since the polarization converted into the linear polarization by the circular polarization / linear polarization converter is separated by the parallel grating plate 14, the cross polarization protection ratio is improved, and at the same time, on one dielectric plate 9. It is possible to take out a desired polarized wave from the inside of the circular waveguide 12 by the probes 13 and 8 provided in the above and process the signal. Although the present embodiment has been described with respect to an example using the metal blocks 18 and 19 and the dielectric plate 21 as the circular polarization / linear polarization converter, it is used as the circular polarization / linear polarization converter. It is also possible to use another shape, for example, one in which circular ridges can be converted into linearly polarized waves by attaching ridges or the like at positions facing the inner wall of the circular waveguide.

[0022]

As described above, when the present invention is applied to the primary radiator for receiving linearly polarized waves, the cross polarization protection ratio between the vertically polarized waves and the horizontally polarized waves is improved, and at the same time, one dielectric material is used. Vertically polarized waves or horizontally polarized waves can be extracted from the circular waveguide by two probes provided on the plate and processed, and if applied to a primary radiator for receiving circularly polarized waves, a right-handed circularly polarized wave can be obtained. The cross polarization protection ratio is improved between the wave and the left-hand circular polarization, and the right-hand circular polarization and the left-hand circular polarization are extracted from the circular waveguide with two probes provided on one dielectric plate. Signal processing.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a primary radiator showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a primary radiator showing a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a primary radiator showing a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a primary radiator showing a fourth embodiment of the present invention.

FIG. 5 is a partially cutaway perspective view of a primary radiator showing a fifth embodiment of the present invention.

FIG. 6 is a partially cutaway perspective view of a primary radiator showing a conventional example.

[Explanation of symbols]

 1 Aperture 2 Circular Waveguide 3 Probe 4 Through Hole 5 End Surface 6 Slot 7 Square Waveguide 8 Probe 9 Dielectric Plate 10 Opening 11 Square Waveguide 12 Circular Waveguide 13 Probe 14 Parallel Lattice Plate 15 Circular / Square converter 16 Square waveguide 17 Opening 18 Metal lump 19 Metal lump 21 Dielectric plate

Claims (5)

[Claims] 1. A circular waveguide having an opening at one end for introducing a radio wave and a terminating surface having a connecting slot at the other end, and a connecting slot provided at the terminating surface. A rectangular waveguide connected through the circular waveguide in a direction orthogonal to the circular waveguide, a dielectric plate provided on an outer surface of the circular waveguide in a direction intersecting the rectangular waveguide, A first probe that is mounted substantially vertically on the dielectric plate, is inserted toward the center of the circular waveguide, and is arranged parallel to the longitudinal direction of the slot; and parallel to the dielectric plate. A second waveguide which is provided on the same dielectric plate in any direction and which is inserted from the center of one side of the cross section of the rectangular waveguide which is parallel to the extended center line of the circular waveguide. And a primary radiator. 2. The slot provided on the end face of the circular waveguide passes through the center of the end face, and the longitudinal direction of the slot is set to about half the wavelength of the radio wave propagating in the circular waveguide. The primary radiator of claim 1, wherein the primary radiator is a radiator. 3. A circular waveguide having an opening at one end for introducing a radio wave and having a parallel grating plate therein, and a circular / square converter connected to the other end of the circular waveguide. A rectangular waveguide connected to the opposite side of the connection portion of the circular / rectangular converter with the circular waveguide, curved in the middle and having the end as the end surface and extending in a direction orthogonal to the circular waveguide A tube, a dielectric plate provided on the outer surface of the circular waveguide in a direction intersecting with the rectangular waveguide, and mounted substantially vertically on the dielectric plate, and the center of the circular waveguide The first probe inserted toward the rectangular waveguide and the rectangular waveguide which is provided on the dielectric plate in a direction parallel to the dielectric plate and is parallel to the extended center line of the circular waveguide. A second probe inserted into the tube from the center of one side of the cross section of the tube. Primary radiator. 4. The parallel grating of the parallel grating plate, the first probe, and the pair of sides of the rectangular opening of the circular / rectangular converter are arranged substantially parallel to each other when viewed from the opening. The primary radiator according to claim 3, wherein 5. A circularly polarized wave is provided on the opening side in the circular waveguide.
A linear polarization converter is provided, and right-hand circular polarization and left-hand circular polarization are introduced from the opening, and one of the linear polarizations converted by the circular polarization / linear polarization converter is converted into the first polarization. 4. The primary radiator according to claim 1, wherein the primary radiator is coupled to a probe, and the other of the linearly polarized waves converted by the circular polarization / linear polarization converter is coupled to the second probe.