JPH0799401A - Microstrip line-waveguide converter - Google Patents

Abstract

PURPOSE:To simplify the structure by making a rectangular waveguide orthogonal to a circular waveguide one unit and to improve the earthing stability by making each side of the waveguides with a rigid body. CONSTITUTION:This converter is provided with a circular waveguide 2 being an input waveguide and a rectangular waveguide 3 orthogonal to the waveguide 2 and connected integrally thereto. Each side of the waveguide 2, 3 is made of a rigid body such as a chassis 12. A horizontally polarized wave and a vertically polarized wave orthogonal to each other received from a horn are made incident into the circular waveguide 2. The horizontally polarized wave is made incident into the rectangular waveguide 3 by a 1st reflecting wave 8, detected by a 1st probe 4 formed on a printed circuit board 1, and fed to a circuit on the board 1 via a 1st microstrip line 6. Furthermore, the vertically polarized wave is made incident in a 2nd reflecting plate 9 through the 1st reflecting plate 8 and fed to a circuit on the board 1 via a 2nd microstrip line 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is used, for example, in an input section of a converter for an antenna for receiving satellite broadcasting or satellite communication,
The present invention relates to a microstrip line-waveguide converter for receiving a horizontally polarized wave and a vertically polarized wave which are orthogonal to each other with a high degree of separation.

[0002]

2. Description of the Related Art Conventionally, since two types of independent linear waves orthogonal to each other, that is, a horizontal polarization and a vertical polarization are received,
An outdoor converter for receiving satellite broadcasting mounted on an antenna is known, and a conventional technique as shown in FIG. 2 has been used. Incidentally, FIG. 2A shows a coaxial-axis as an example of a conventional technique.
It is a longitudinal cross-sectional view of a waveguide converter, the same (b) is a cross-sectional view of the same converter.

In FIG. 2, a circular waveguide 22 connected to a horn (not shown) for receiving a signal, and a first rectangular waveguide 23 which is integrally connected orthogonally thereto, First
Circular waveguide 22 at a fixed distance from the rectangular waveguide 23
The second rectangular waveguide 24 integrally connected to the circular waveguide 22 is provided inside the circular waveguide 22, and the first reflecting rod 25 and the second reflecting rod 26 are provided at a certain distance. The first reflecting rod 25 is provided parallel to the electric field of the horizontal polarized wave for reflecting the first linear polarized wave, for example, the horizontal polarized wave, and the reflected horizontal polarized wave is the first rectangular waveguide 23. Be led to. The second reflection rod 26 is provided with a second linearly polarized wave, for example, a vertically polarized wave, in parallel with the electric field of the vertically polarized wave, and the reflected vertically polarized wave is the second rectangular waveguide 24. Be led to.

The horizontal polarization in the first rectangular waveguide 23 is 45
It is bent once and is detected by the first probe 28 provided on the circuit board 27 which constitutes one surface of the first rectangular waveguide 23. The vertically polarized wave in the second rectangular waveguide 24 is bent 45 degrees in the opposite direction to the horizontally polarized wave, and is provided on the circuit board 27 that also constitutes one surface of the second rectangular waveguide 24. 2 probe 29. Note that FIG.
In the figure, 30 is a cover and 31 is a chassis.

[0005]

However, in the above-mentioned conventional technique, the rectangular waveguides 23 and 2 orthogonal to the circular waveguide 22 are provided.
Two probes 4 and 29 provided on the circuit board 27 are projected into the rectangular waveguides 23 and 24, and signals are sent to the circuit board 27. As described above, the structure is very complicated, the number of parts is large, and the ground surface on the back surface of the circuit board 27 is one of the rectangular waveguides 23 and 24, so that the ground becomes very unstable. .

It is an object of the present invention to provide means for simplifying the structure and improving the stability of the ground of a circuit board as compared with the prior art.

[0007]

A microstrip line-waveguide converter of the present invention includes an input waveguide for transmitting first and second linearly polarized waves orthogonal to each other, and an input waveguide for the input waveguide. A rectangular waveguide provided so as to be orthogonal to each other, a circuit board provided outside the input waveguide, and a part of which protrudes into the rectangular waveguide, and the rectangular waveguide having the above-mentioned structure. A first reflector provided so as to input the first linearly polarized wave;
A second reflector provided in parallel with the circuit board protruding inside the rectangular waveguide; and inside the input waveguide,
A third reflecting plate provided in parallel with the second probe between the second probe for detecting the second linearly polarized wave and the end face of the input waveguide; and the first probe. On the circuit board, a microstrip line for transmitting the first linearly polarized wave from the coaxial line to the circuit, a coaxial portion including the second probe and the insulating layer, and the second linearly polarized wave from the coaxial portion on the circuit board. And a microstrip line for transmitting to the circuit.

[0008]

With the above construction, since two rectangular waveguides orthogonal to a circular waveguide, which were required in the conventional technique, can be combined into one, the number of parts can be reduced, the structure can be simplified, and mass production is possible. The quality is also good. Further, each of the surfaces forming the waveguide can be a rigid body such as a chassis, and the stability of the ground is improved.

[0009]

The present invention will be described in detail below based on an example.

FIG. 1A is a plan view of a microstrip line-waveguide converter according to an embodiment of the present invention, and FIG. 1B is a sectional view taken along the line AA 'in FIG. 1A. , (C) is a sectional view taken along line BB ′ in (a).

Referring to FIG. 1, a microstrip line-waveguide converter according to an embodiment of the present invention includes a circular waveguide 2 which is an input waveguide connected to a receiving horn (not shown). , And a rectangular waveguide 3 which is orthogonal to and integrally connected to the rectangular waveguide 3. In the circular waveguide 2, the first reflection plate 8 is arranged in parallel with the electric field direction of horizontal polarization (or vertical polarization).
However, the distance from the second probe 5 to the end face side of the circular waveguide 2 for impedance matching between the circular waveguide 2 and the coaxial of the second probe 5 and the insulating layer 11 (for example, A second reflection plate 9 is provided which is separated by 1/4 wavelength and reflects vertical polarization (or horizontal polarization). Further, the third reflection plate 10, which reflects the horizontally polarized wave (or the vertically polarized wave) reflected by the first reflection plate 8 and constitutes a part of the rectangular waveguide 3, is a circuit of the circuit board 1. The rectangular waveguide 3 and the first microstrip line 6 are provided apart from the mounting surface by a distance (for example, 1/4 wavelength) for impedance matching, and the chassis 12 and screws are provided via the circuit board 1. It is fixed using 13. The circuit board 1 is provided outside the circular waveguide 2, and a part of the circuit board 1 projects inside the rectangular waveguide 3.

The first probe 4 is a rectangular waveguide 3
It is formed on the circuit board 1 provided so as to project inward, and detects the horizontal polarized wave (or the horizontal polarized wave) incident on the rectangular waveguide 3 by the first reflecting plate 8 to detect the first micro wave. It transmits to the circuit mounted on the circuit board 1 via the strip line 6, the second probe 5 forms a coaxial portion with the insulating layer 11, detects the vertically polarized wave (or the horizontally polarized wave), and It is transmitted to the circuit mounted on the circuit board 1 through the microstrip line 7 of 2.

Next, the operation of the microstrip line-waveguide converter of one embodiment of the present invention will be described.

First, horizontal polarization and vertical polarization, which are two types of independent linear waves orthogonal to each other, received from a horn (not shown) are incident on the circular waveguide 2. Of these two polarized waves, the horizontally polarized wave is incident on the rectangular waveguide 3 by the first reflection plate that is provided horizontally with respect to the electric field direction of the horizontally polarized wave, and the vertically polarized wave is the first reflection plate. After passing through 8, the light enters the second reflecting plate 9.

Next, the horizontally polarized wave is reflected by the third reflecting plate 10, is detected by the first probe 4 formed on the circuit board 1, and is detected via the first microstrip line 6. It is transmitted to the circuit mounted on the circuit board 1. Further, the vertically polarized wave is detected by the second probe 5 that forms a coaxial portion with the insulating layer 11, and is transmitted to the circuit mounted on the circuit board 1 via the second microstrip line 7.

[0016]

As described above in detail, by using the present invention, the number of circuit boards is reduced to one, and two rectangular waveguides orthogonal to a circular waveguide, which are required in the conventional technique, are used. Since only one wave tube can be used, the number of parts can be reduced and the structure can be simplified as compared with the conventional case. Also, all the component surfaces of the waveguide are rigid bodies such as chassis,
Ground stability is improved.

[Brief description of drawings]

1A is a plan view of a microstrip line-waveguide converter according to an embodiment of the present invention, FIG. 1B is a sectional view taken along line AA ′ in FIG. 1A, and FIG. B- in a)
It is a B'cross section.

FIG. 2A is a vertical sectional view of a coaxial-waveguide converter as an example of a conventional technique, and FIG. 2B is a transverse sectional view of the converter.

[Explanation of symbols]

 1 Circuit Board 2 Circular Waveguide 3 Rectangular Waveguide 4 First Probe 5 Second Probe 6 First Microstripline 7 Second Microstripline 8 First Reflector 9 Second Reflector 10 Third reflector 11 Insulating film 12 Chassis 13 Screw

Claims (1)

[Claims] 1. An input waveguide for transmitting first and second linearly polarized waves orthogonal to each other, a rectangular waveguide provided so as to be orthogonal to the input waveguide, and the input waveguide. A circuit board provided outside of the rectangular waveguide, a part of which projects into the rectangular waveguide, and a first reflection provided so that the first linearly polarized wave is input to the rectangular waveguide. A plate, a second reflecting plate provided in parallel with the circuit board projecting inside the rectangular waveguide, and a second reflecting plate for detecting the second linearly polarized wave inside the input waveguide. Between the probe and the end face of the input waveguide, a third reflector provided in parallel with the second probe, and a first linearly polarized wave from the first probe to the circuit. A microstrip line for transmission, a coaxial portion including the second probe and an insulating layer, and the coaxial portion including the coaxial portion Waveguide converter - a microstrip line, characterized in that a microstrip line for transmitting the second linearly polarized wave to a circuit on the circuit board.