JP2000269730A - Polarized wave branching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure, capable of easily producing a short plate of a polarized wave branching device which receives a horizontally polarized wave and a vertically polarized wave. SOLUTION: In this polarized wave branching device, a radio wave from a communication satellite or the like which is introduced from a front aperture part 11a of a circular waveguide 11 is separated into respective polarized waves and then is received by a probe 12 for horizontally polarized wave arranged at the rear of the waveguide and a probe 13 for vertically polarized wave arranged in the front. The received radio signal is led to a circuit board 15 and is subjected to amplification, frequency conversion, etc., and is transmitted to a tuner for satellite or the like and is used. In the probe 12 for horizontally polarized wave arranged at the rear of the circular waveguide 11, the deep part of the circular waveguide 11 functions as a short face 11b. In the probe 13 for vertically polarized wave arranged in the front, the front face of a short plate 14 which is extended from the short face 11b of the circular waveguide to the front, through the other rear prove 12 for horizontally polarized wave and is arranged is used as a short face 14a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarization splitter for receiving horizontally and vertically polarized waves used as a satellite receiving antenna, and more particularly to a structure of a short plate which can be easily manufactured.

[0002]

2. Description of the Related Art In a polarization demultiplexing device used as a primary radiator for a satellite antenna, in order to receive horizontal and vertical polarized waves in a circular waveguide without interference, different components in a circular waveguide are received. Planes need to receive each polarization. FIG. 3 is (A) a front view and (B) a side cross-sectional view (cross-section c3-c3 in FIG. 3) of an essential part of an example of a conventional polarization splitter. Radio waves from a communication satellite or the like introduced from the front opening 11a of the circular waveguide 11 are transmitted by a horizontal polarization probe 12 disposed behind the waveguide and a vertical polarization probe 1 disposed forward.
At 3 the respective polarized waves are separated and received. The received radio signal is guided to the circuit board 15, amplified, frequency-converted, etc., transmitted to a satellite tuner or the like for use. In the probe 12 for horizontal polarization disposed behind the circular waveguide 11,
The inner part of the circular waveguide 11 functions as the short surface 11b.
In the vertical polarization probe 13 disposed in front, the front surface of the screw 34 screwed from the side of the circular waveguide 11 behind the vertical polarization probe 13 is a short surface 34a. However, in such a structure, the screw 34 must be screwed in from the side of the circular waveguide 11, and the head of the screw 34 must be shawled with silicone resin or the like to perform waterproofing. There is a problem that requires.

FIG. 4 is (A) a front view and (B) a side sectional view (c4-c4 section of the same figure) of a main part of another example of the conventional polarization demultiplexer. In this example, a radio wave introduced from the front opening 21a of the circular waveguide 21 is converted into a vertically polarized probe 22 disposed behind the waveguide and a rectangular waveguide 26 disposed forward. Each polarization is separated and received by the polarization slot 23a. The received radio signal is guided to a circuit board 25 by a vertically polarized probe 22 and a microstrip line 23, amplified, frequency-converted, transmitted to a satellite tuner or the like for use. Circular waveguide 2
In the vertically polarized probe 22 disposed behind the circular waveguide 1, the deep portion of the circular waveguide 21 functions as a short surface 21b. In the horizontal polarization slot 23a disposed in front, the front surface of the sheet metal 44 inserted into the circular waveguide 21 is a short surface 44a. However, even with such a structure, the sheet metal 4
No. 4 cannot be molded with a mold integral with the circular waveguide 21 and needs to be inserted into the circular waveguide 21 later, which causes a problem that the production is troublesome.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has an object to provide a structure capable of easily manufacturing a short plate of a polarization demultiplexer for receiving horizontal polarization and vertical polarization. Aim.

[0005]

Means for Solving the Problems Two probes orthogonal to each other are provided on two different planes orthogonal to the tube axis in a circular waveguide to separate and receive horizontally polarized or vertically polarized radio waves. In the polarization demultiplexer, the short plate of one receiving probe in front of the circular waveguide is moved forward from the short surface at the back of the circular waveguide through the other probe behind the circular waveguide. The structure is such that it can be extended and arranged so as to be formed integrally with the housing of the circular waveguide.

A slot for converting a rectangular waveguide is used instead of the one probe.

The distance between the short surface and the other probe and between the front surface of the short plate and one probe or slot is set to ４ of the guide wavelength of the received radio wave.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is (A) a front view and (B) a side sectional view (section c1-c1 in FIG. 1) of a main part of one embodiment of a polarization demultiplexer according to the present invention. As in the conventional example (FIG. 3), a radio wave from a communication satellite or the like introduced from the front opening 11a of the circular waveguide 11 is transmitted to the horizontal polarization probe 12 disposed behind the waveguide and forward. Each of the polarized waves is separated and received by the arranged vertical polarization probe 13. The received radio signal is guided to the circuit board 15, amplified, frequency-converted, etc., transmitted to a satellite tuner or the like for use.
Probe 1 for horizontal polarization arranged behind circular waveguide 11
In 2, the inner part of the circular waveguide 11 functions as the short surface 11b. On the other hand, the vertically polarized probe 13
Here, the front surface of the short plate 14, which is arranged so as to extend from the short surface 11b of the circular waveguide to the front through the other horizontal polarization probe 12 on the rear side, is defined as a short surface 14a.
By adopting such a structure of the short plate 14, the short plate 14 can be formed integrally with the housing of the circular waveguide 11, and the manufacture becomes easy. In addition, short side 1
1b to the distance L1 between the horizontal polarization probe 12 and the distance L2 between the short surface 14a on the front surface of the short plate 14 and one of the vertical polarization probes 13 are set to 4 times the guide wavelength of the received radio wave.
1 / This allows each probe to efficiently receive each polarization. The vertical polarization probe 13 and the horizontal polarization probe 12 and the circular waveguide 11
Are insulated with Teflon 13a or the like.

FIG. 2A is a front view and FIG. 2B is a sectional side view of a main part of another embodiment of the polarization demultiplexer according to the present invention.
21-c21 section) B), a plane section view (c22-c2 in FIG.
2 sections). In this example, as in the conventional example (FIG. 4), a radio wave introduced from the front opening 21a of the circular waveguide 21 is applied to a vertically polarized probe 2 disposed behind the waveguide.
2 and a horizontal polarization slot 23a that is fed by a microstrip line 23 disposed in front thereof to separate and receive the respective polarized waves. The received radio signal is guided to a circuit board 25 by a vertically polarized probe 22 and a microstrip line 23, amplified, frequency-converted, transmitted to a satellite tuner or the like for use. In the vertical polarization probe 22 disposed behind the circular waveguide 21, the deep portion of the circular waveguide 21 functions as a short surface 21b. On the other hand, in the horizontal polarization slot 23a for conversion to the rectangular waveguide 26,
The front surface of the short plate 24, which extends from the short surface 21b of the circular waveguide 21 to the front through the other vertical polarization probe 22 on the rear side, is defined as a short surface 24a. By adopting such a structure of the short plate 24, the short plate 24 can be formed integrally with the housing of the circular waveguide 21, thereby facilitating the manufacture. In addition, the short side 21
From b, the interval between the probe 22 for vertical polarization and the interval between the short surface 24a on the front surface of the short plate 24 and one slot 23a for horizontal polarization are set to ４ of the guide wavelength of the received radio wave. This allows each probe to efficiently receive each polarization. The vertical polarization probe 22
The space between the waveguide and the circular waveguide 21 is insulated by a Teflon 22a or the like.

[0010]

As described above, two probes orthogonal to each other are provided on two different planes orthogonal to the tube axis in the circular waveguide to separate horizontally polarized or vertically polarized radio waves. In the polarization demultiplexing device that receives the signal, the short plate of one of the front receiving probes extends from the short surface at the back of the circular waveguide to the front through the other probe at the rear, and is disposed. By doing so, the short plate can be formed integrally with the housing of the circular waveguide, and the polarization splitter can be easily manufactured.

[Brief description of the drawings]

FIG. 1A is a front view and FIG. 1B is a sectional side view of a main part of an embodiment of a polarization demultiplexing device according to the present invention (cross section c1-c1 in FIG. 1).
It is.

FIG. 2A is a front view and FIG. 2B is a sectional side view of a main part of another embodiment of the polarization demultiplexer according to the present invention (c21-c21 in FIG. 2).
FIG. 4B is a side cross-sectional view (cross section c22-c22 in FIG. 4).

3A is a front view and FIG. 3B is a sectional side view (a section taken along line c3-c3 in FIG. 3) of an essential part of an example of a conventional polarization demultiplexing device.

FIG. 4 is (A) a front view and (B) a side sectional view (c4-c4 section in FIG. 4) of a main part of another example of the conventional polarization demultiplexer.

[Explanation of symbols]

 Reference Signs List 11 circular waveguide 11a front opening 11b short surface 12 horizontal polarization probe 13 vertical polarization probe 13a Teflon 14 short plate 15 circuit board 21 circular waveguide 21a front opening 21b short surface 22 vertical polarization probe 22a Teflon 23 Microstrip line 23a Slot for horizontal polarization 24 Short plate 25 Circuit board 26 Rectangular waveguide

Claims (3)

[Claims] 1. A different waveguide orthogonal to a tube axis in a circular waveguide.
In a polarization demultiplexer that provides two probes orthogonal to each other on two planes and separates and receives horizontal polarization or vertical polarization, a short plate of one reception probe provided in front of a circular waveguide Can be formed integrally with the housing of the circular waveguide by extending the short probe at the back of the circular waveguide and extending forward through the other probe provided behind the circular waveguide. A polarization demultiplexer characterized by the following. 2. The polarization demultiplexer according to claim 1, wherein a slot for converting a rectangular waveguide is used instead of said one probe. 3. The apparatus according to claim 1, wherein the distance between the short surface and the other probe and the distance between the front surface of the short plate and the one probe or slot are set to １ of the guide wavelength of the received radio wave. The polarization demultiplexer according to claim 2.