JPH11186804A - Primary radiator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a means that separates an orthogonally polarized wave with a small configuration and with excellent isolation. SOLUTION: This primary radiator is provided with a circular waveguide 1 provided with an opening 1c at one end to introduce two mutually orthogonally polarized waves, and a rectangular waveguide 2 adjacent to the circular waveguide 1, whose guide axis is in parallel with the axis of the waveguide 1 and whose front and rear parts are closed. A 1st probe 6 is provided between the circular waveguide 1 and the rectangular waveguide 2 to introduce a vertically polarized wave in the orthogonally polarized wave introduced from the opening 1c into the rectangular waveguide 2. A printed circuit board 3 is provided perpendicularly to the guide axis in front of a depth part 1d of the circular waveguide 1, a 2nd probe 4 provided on the printed circuit board 3 in the circular waveguide 1 receives a horizontally polarized wave. Furthermore, a 3rd probe 5 provided on the printed circuit board 3 in the rectangular waveguide 2 receives the horizontally polarized wave introduced into the rectangular waveguide 2 by the 1st probe and a low noise block LNB circuit (not shown in a figure) provided on the same printed circuit board 3 performs reception processing to both the polarized waves.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact primary radiator for receiving orthogonally polarized waves with good isolation.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a conventional primary radiator for separating and receiving orthogonal polarized waves. With the deep part 51d of the circular waveguide 51 provided with an opening 51c for introducing orthogonal polarization at one end as a short plate, horizontal and vertical polarizations are respectively performed by probes 54 and 55 configured on a circuit board 53 in front of the circular plate. To receive. The probe 54, 55 and the circuit board are on the same plane by processing the received signal in the LNB (Low Noise Block) such as the first stage amplifier or the like configured on the same circuit board 53. The entire radiator can be downsized. However, in such a configuration, since the probes 54 and 55 mutually disturb the electric field, there is a problem that the isolation between the probes generally requires 25 dB or more, but only about 17 to 18 dB can be obtained. On the other hand, in order to increase the isolation between the probes, it is necessary to arrange both probes three-dimensionally. In this case, there is a problem that it is difficult to reduce the size of the entire primary radiator.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a small structure for orthogonal polarization.
It is an object to provide means for separating with good isolation.

[0004]

Means for Solving the Problems 2 are mutually perpendicular to one end.
A circular waveguide having an opening for introducing two polarizations, a rectangular waveguide adjacent to the circular waveguide and having a parallel tube axis, and a circular waveguide and a rectangular waveguide A circuit board provided vertically, a first probe penetrating from the circular waveguide to the rectangular waveguide, and second and corresponding to the circular waveguide and the rectangular waveguide provided on the circuit board. A third probe is provided, the second probe receives one polarized wave to be introduced into the same circular waveguide, and the first probe receives the other polarized wave and introduced into the same rectangular waveguide. And the signal is received by the third probe, and the received signal is processed by the same circuit board.

The first probe is sealed in a substantially cylindrical container made of Teflon, polyester or other synthetic resin, and one end of the container is planted on the wall surface of the rectangular waveguide.

[0006] The second probe and / or the third probe comprises a conductor pattern provided on the circuit board.

The circuit board is provided in front of the second short-circuited plate of the other polarization provided at the back of the circular waveguide, and the first probe is located at substantially the same position as the circuit board. It is provided in front of the provided first short plate of the one polarized wave.

The distance between the second short plate and the circuit board and the distance between the first short plate and the first probe are set to approximately 1/4 of the guide wavelength of the polarized wave.

[0009] The first short plate is a prism parallel to the first probe formed integrally with the circular waveguide.

[0010] Alternatively, the first short plate is a grid-like conductor pattern parallel to the first probe formed on the circuit board.

A third short plate is provided in front of the rectangular waveguide, and a fourth short plate is provided behind the rectangular waveguide, between the third short plate and the first probe. And the distance between the third probe and the fourth short plate,
It is set to approximately 1/4 of the guide wavelength of the polarized wave.

The third short plate and / or the fourth short plate is a closing plate for closing the front and rear of the rectangular waveguide integrally formed with the rectangular waveguide.

The circuit board is located in front of a short plate provided at the back of the circular waveguide and at a position approximately one-fourth of the guided wavelength of the polarized light from the short plate.
It is provided in front of the short plate and at a position approximately 3/4 of the guide wavelength of the polarized light from the short plate.

The circuit board is provided at the back of the circular waveguide, and supplies power to the second probe on the circuit board through a slot provided in front of the circuit board. It is provided at the position of 1/4 of the guide wavelength.

The slot comprises a conductor pattern on the circuit board.

Alternatively, the slot is a deep portion of the waveguide formed integrally with the waveguide.

A circularly polarized wave generator is provided between the opening of the waveguide and the first and second probes to receive right-handed and left-handed circularly polarized waves.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A is a front view of a circular waveguide portion of an embodiment of a primary radiator according to the present invention, and FIG.
It is a side sectional view, (C) Rear sectional view. A circular waveguide 1 having an opening 1c for introducing two mutually orthogonal polarized waves at one end and a rectangular waveguide 2 adjacent to the circular waveguide 1 and having a parallel tube axis are provided. A first probe (6) penetrating from the circular waveguide (1) to the rectangular waveguide (2) is provided, and the vertical polarization of the orthogonal polarization introduced from the opening (1c) is introduced into the rectangular waveguide (2). A circuit board 3 is provided in front of the inner part 1d of the circular waveguide 1 in a direction perpendicular to the tube axis, and a second probe 4 provided on the circuit board 3 in the circular waveguide 1 receives horizontal polarized waves. Further, the third probe 5 provided on the circuit board 3 in the rectangular waveguide 2 receives the horizontally polarized wave introduced into the rectangular waveguide 2 by the first probe, and The provided LNB circuit (not shown) performs reception processing of both polarized waves.

The first probe 6 is sealed in a substantially cylindrical container 7 made of Teflon, polyester or other synthetic resin, and one end of the container 7 is implanted on the wall surface of the rectangular waveguide 2 with screws or the like. By doing so, the probe 6 is insulated from the waveguide wall of the waveguide and is held at a fixed position. Further, the second probe 3 or the third probe 4 can be a metal bar provided on the circuit board 3, but the probe can be easily formed by using a conductor pattern on the circuit board 3.

The circuit board 3 is positioned approximately one quarter (L1 in FIG. 1) of the guided wavelength of the polarized light from the second short plate 1d at the back of the circular waveguide 1, and The first probe is received by the second probe as the second short plate 1d of the horizontal polarization. In addition, the first probe 6 is located at a position in front of the vertically polarized first short plate 8 provided at substantially the same position as the circuit board 3 by approximately 1/4 (L1 in the figure) of the guide wavelength of the polarized light. I do. The first short plate 8 can be configured as a prism parallel to the first probe 6 formed integrally with the circular waveguide 1.

At the front and rear of the rectangular waveguide 2, a closing plate integrally formed with the rectangular waveguide 2 or a separately provided one is provided as a third short plate 2c and a fourth short plate 2d. The distance L1 between the third short plate 2c and the first probe 6, and the distance L1 between the third probe 5 and the fourth short plate 2d are set to approximately 1/4 of the guide wavelength of the polarized light.

FIG. 2 shows (A) a front view of a circular waveguide portion, (B) a sectional side view of another embodiment of the primary radiator according to the present invention,
(C) It is a rear sectional view. Except for different structures of the circular waveguide 21, the rectangular waveguide 22, and the circuit board 23, the configuration and operation of each part are the same as described above. On the opposite surface of the second probe 4 on the circuit board 23, a grid-like conductor pattern is formed from a ground conductor. The direction of the grating is perpendicular to the second probe 4 and allows transmission of horizontally polarized waves, and is parallel to the first probe 6 to form a vertically polarized short plate 28.

FIG. 3 is a side sectional view (A) and a rear sectional view (B) of another embodiment of the primary radiator according to the present invention. Except for the difference in the structure of the circular waveguide 31 and the rectangular waveguide 32, the configuration and operation of each part are the same as described above. The circuit board 3 has a short plate 21d at the back of the circular waveguide 31 or the like, and the front portion thereof has a wavelength of approximately 1/4 of the guide wavelength of the polarized light (L in the drawing).
It is provided at the position of 1). Further, the first probe 6 has a wavelength of about ／ of the guide wavelength in front of the short plate 21 d.
(L2 in the figure).

FIG. 4 is (A) a front view, (B) side sectional view, and (C) rear sectional view of still another embodiment of the primary radiator according to the present invention. Except for the different structures of the circular waveguide 41, the rectangular waveguide 42, and the circuit board 43, the configuration and operation of each part are the same as described above. The circuit board 43 is provided at the back of the circular waveguide 41, and the second probe 4 on the circuit board 43 is supplied with power by a slot 48 provided in front of the circuit board 43. The position of the slot 48 acts as a short plate at a position of approximately 1/4 of the front guide wavelength (L1 in the figure). The slot 48 can be easily formed by forming a conductor pattern on the circuit board 43, or by integrally forming the inner portion of the circular waveguide 41 as a deep portion of the circular waveguide 41.

In the above description, the incident polarization is described as linear polarization. However, the present invention is not limited to this. For example, a circular polarization generator made of a dielectric plate or the like may be used as a circular waveguide. By inserting between the opening 1a of the tube 1 and the first probe 6, the right-handed circularly polarized wave and the left-handed circularly polarized wave can be received in the same manner as described above.

[0026]

A circular waveguide having at one end an opening for introducing two mutually orthogonal polarized waves, a rectangular waveguide adjacent to the circular waveguide and having a parallel pipe axis, and a circular waveguide A circuit board provided perpendicular to the waveguide axes of the waveguide and the rectangular waveguide, a first probe penetrating from the circular waveguide to the rectangular waveguide, and a circular waveguide provided on the circuit board; A second probe corresponding to the tube and a rectangular waveguide, a second probe receiving one polarization to be introduced into the same circular waveguide, and a first probe receiving the other polarization. The orthogonal polarization is reduced in size and with good isolation by receiving the signal, introducing it into the same rectangular waveguide, receiving it with the third probe, and performing reception signal processing on the circuit board. A primary radiator is obtained.

[Brief description of the drawings]

FIG. 1A is a front view, FIG. 1B is a side sectional view, and FIG. 1C is a rear sectional view of a primary radiator according to an embodiment of the present invention.

FIG. 2 (A) of another embodiment of the primary radiator according to the present invention.
It is a circular waveguide front view, (B) side sectional drawing, (C) rear sectional drawing.

FIG. 3 (A) shows another embodiment of the primary radiator according to the present invention.
It is a side sectional view, (B) It is a rear part sectional view.

FIG. 4 is (A) a front view, (B) side sectional view, and (C) rear sectional view of still another embodiment of the primary radiator according to the present invention.

FIG. 5 is an example of a conventional primary radiator for separating and receiving orthogonally polarized waves.

[Explanation of symbols]

 1, 21, 31, 41, 51 Circular waveguide 2, 22, 32, 42 Rectangular waveguide 3, 23, 43 Circuit board 4, 5, 6 Probe 7 Synthetic resin container 8, 28 Short plate 48 Slot

Claims (14)

[Claims] 1. A circular waveguide having at one end an opening for introducing two mutually orthogonal polarized waves, a rectangular waveguide adjacent to the circular waveguide and having a parallel pipe axis, and a circular waveguide. A circuit board provided perpendicular to the waveguide axes of the waveguide and the rectangular waveguide, a first probe penetrating from the circular waveguide to the rectangular waveguide, and a circular waveguide provided on the circuit board; A second probe corresponding to the tube and a rectangular waveguide, a second probe receiving one polarization to be introduced into the same circular waveguide, and a first probe receiving the other polarization. A primary radiator that receives the signal, introduces the signal into the rectangular waveguide, receives the signal with the third probe, and processes the received signal of both polarized waves with the circuit board. 2. The first probe is sealed in a substantially cylindrical container made of Teflon, polyester, or other synthetic resin, and one end of the container is implanted on the wall surface of the rectangular waveguide. The primary radiator according to claim 1, wherein: 3. The primary radiator according to claim 1, wherein the second probe and / or the third probe comprises a conductor pattern provided on the circuit board. 4. The circuit board is provided in front of the second short-circuited plate of the other polarization provided at the back of the circular waveguide, and the first probe is substantially the same as the circuit board. The primary radiator according to claim 1, wherein the primary radiator is provided in front of the first short-circuited plate of the one polarized wave provided at a position. 5. The distance between the second short plate and the circuit board and the distance between the first short plate and the first probe are set to approximately １ ／ of the guide wavelength of the polarized wave. The primary radiator according to claim 4. 6. The primary radiator according to claim 4, wherein said first short plate is a prism parallel to said first probe formed integrally with said circular waveguide. 7. The primary radiator according to claim 4, wherein said first short plate is a grid-like conductor pattern parallel to said first probe formed on said circuit board. 8. A third short plate is provided in front of said rectangular waveguide, and a fourth short plate is provided behind said rectangular waveguide, wherein said third short plate and said first probe are provided. 5. The primary radiator according to claim 4, wherein a distance between the third probe and the fourth short plate is approximately ４ of a guide wavelength of the polarization. 9. The third short-circuit plate and / or the fourth short-circuit plate is a closing plate for closing the front and rear of the rectangular waveguide integrally formed with the rectangular waveguide. The primary radiator according to claim 8, wherein 10. The first probe is located in front of a short plate provided at the back of the circular waveguide, at a position approximately one-quarter of the guided wavelength of the polarized light from the short plate. The primary radiator according to claim 1, wherein the primary radiator is provided at a position in front of the short plate and approximately ／ of the guide wavelength of the polarized light from the short plate. 11. The circuit board is provided at the back of the circular waveguide, and supplies power to the second probe on the circuit board through a slot provided in front of the circuit board. 2. The primary radiator according to claim 1, wherein the primary radiator is provided at a position substantially one-fourth of a wavelength in the front tube. 12. The primary radiator according to claim 1, wherein said slot is formed of a conductor pattern on said circuit board. 13. The waveguide according to claim 1, wherein the slot is formed at the back of the waveguide integrally formed with the waveguide.
Primary radiator as described. 14. A circularly polarized wave generator is provided between an opening of the waveguide and a first probe and a second probe, and receives a right-handed circularly polarized wave and a left-handed circularly polarized wave. The primary radiator according to claim 1, wherein