JPH11112202A - Receiver for linearly polarized wave - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the cross polarized wave characteristic of a linearly polarized wave receiver. SOLUTION: A probe 3 for receiving a vertically polarized wave and a probe 4 for receiving a horizontally polarized wave are placed at a position apart from a rear end face 2 of a circular waveguide 1 by 3/4λ in crossing with each other, a short-circuit probe 5 that short-circuits a vertically polarized wave and is in parallel with the probe 3 and a short-circuit probe 6 that short- circuits a horizontally polarized wave and is in parallel with the probe 4 are placed at a position apart from the rear end face 2 by 1/4λ, and in the case of receiving a vertically polarized wave, the short-circuit probe 6 connects to ground (short-circuit) so as to avoid a horizontally polarized wave from being coupled with the prove 4, and in the case of receiving a horizontally polarized wave, the short-circuit probe 56 connects to ground (short-circuit) so as to avoid a vertically polarized wave from being coupled with the prove 3. Thus, a non-reception polarized wave is not interfered with a received polarized wave.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linearly polarized wave receiving apparatus, and more particularly to a linearly polarized wave receiving apparatus having improved cross polarization characteristics.

[0002]

2. Description of the Related Art In a circular waveguide for receiving linearly polarized waves, for example, as shown in FIG. 3, two probes are located at a quarter wavelength of the received radio wave from the rear end face of the circular waveguide 1. 21 and 22
Are provided orthogonal to each other, the vertical polarization is coupled to the probe 21 and the horizontal polarization is coupled to the probe 22, respectively, and a desired polarization is selected on the substrate 23 shown in the sectional view taken along the line AA '. Had gone. However, there is a problem in that the two probes approach each other because they are close to each other, and cross-polarization characteristics (crosstalk between horizontal and vertical polarizations) deteriorate.

[0003]

SUMMARY OF THE INVENTION In view of the foregoing, the present invention provides a switchable shorting probe, grounds the corresponding shorting probe according to the received polarization, and improves the cross polarization characteristics. The purpose is to improve.

[0004]

In order to achieve the above object, in the linearly polarized wave receiving apparatus of the present invention, the first probe and the first probe are located at a position three-quarters of the wavelength of the received radio wave from the rear end face of the circular waveguide. A second probe is provided orthogonal to each other, and a first short probe parallel to the first probe and a second short probe parallel to the second probe are placed at a quarter wavelength position from the rear end face. The short-circuit probe is grounded according to the received polarization, and cross polarization due to non-reception polarization is removed.

The first probe is for receiving vertically polarized waves, the second probe is for receiving horizontally polarized waves, the second shorting probe is grounded when receiving vertically polarized waves, and the second probe is used for receiving horizontally polarized waves. 1 Ground the shorting probe.

A printed circuit board is provided on a side surface of the circular waveguide, and legs of the first probe, the second probe, the first short probe, and the second short probe are respectively connected to conductive portions. It may be.

In this case, the first shorting probe or the second shorting probe is connected to a ground conductor provided on the printed circuit board to be grounded.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. FIG. 1 is a main part of an embodiment of a linearly polarized wave receiving apparatus according to the present invention.
(B) is a sectional view taken along the line AA ', (c) is a sectional view taken along the line BB', and (d) is an upper sectional view. In the figure, 1 is a circular waveguide, 2 is a rear end face of the circular waveguide 1, 3 is a first probe for receiving vertically polarized waves, 4 is a second probe for receiving horizontally polarized waves, and 5 is a horizontally polarized wave. A first shorting probe which is grounded when receiving and short-circuits the vertical polarization component, 6 is a second shorting probe which is grounded and short-circuits the horizontal polarization component when receiving vertically polarized wave, 7
Is a printed circuit board on which the legs of the first probe 3, the second probe 4, the first short probe 5, and the second short probe 6 are inserted and connected to conductors, respectively. 1 is provided on the upper oblique side surface.

The first probe 3 and the second probe 4 are provided orthogonal to each other at a position three-quarters of a wavelength (λ) from the rear end face 2, that is, a position at a quarter wavelength from the rear end face 2, that is,
A first short probe 5 parallel to the first probe 3 is provided at a position ２λ from the first and second probes.
A second short probe 6 is provided in parallel with the probe 4. The two shorting probes are orthogonal to each other. The vertically polarized signal is input from the radio wave introduction end of the circular waveguide 1 and is coupled to the first probe 3, and the horizontally polarized signal is coupled to the second probe 4. LNB (Low Noise Frequency Converter) provided for vertical polarization
Alternatively, the signals are input to the LNBs for horizontal polarization, signal processed, and received.

When receiving vertically polarized waves, the second short probe 6 is grounded (short-circuited) by the switch 11 on the printed circuit board 7 shown in FIG. (For horizontal polarization reception), the horizontal polarization signal is not coupled to the second probe 4 because it is located at a position of 1 / 2λ from the first probe 3 due to the horizontal polarization component.
No interference to power, cross polarization protection ratio (cross polarization characteristics)
And when receiving horizontally polarized waves, the printed circuit board 7
The first short-circuiting probe 5 is grounded (short-circuited) by the switch 11 of FIG.
Since the probe 3 (for receiving vertically polarized waves) is located at a position of 1 / 2λ, the vertically polarized signal does not couple to the first probe 3, and therefore, interference of the vertically polarized components on the second probe 4 may occur. And the cross polarization characteristics are improved.

[0011]

As described above, according to the linear polarization receiving apparatus of the present invention, the horizontal polarization short probe is grounded (short-circuited) at the time of vertical polarization reception. The vertical polarization signal is not coupled to the vertical polarization receiving probe because the vertical polarization shorting probe is grounded during horizontal polarization reception without coupling to the reception probe. The cross polarization characteristic (protection ratio) can be improved without interference of wave signals.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main part of an embodiment of a linearly polarized wave receiving apparatus according to the present invention.

FIG. 2 is an example of a printed circuit board.

FIG. 3 is an example of a conventional linearly polarized wave receiving device.

[Explanation of symbols]

 Reference Signs List 1 circular waveguide 2 rear end face 3 first probe (for receiving vertically polarized wave) 4 second probe (for receiving horizontally polarized wave) 5 first short probe (for short circuit of vertical polarized wave) 6 probe for second short ( (For horizontal polarization short circuit) 7 Printed circuit board

Claims (4)

[Claims] 1. A first probe and a second probe are provided orthogonal to each other at a position three-quarters of a wavelength of a received radio wave from a rear end face of a circular waveguide, and one quarter from the rear end face.
At a wavelength position, a first short probe parallel to the first probe and a second short probe parallel to the second probe are provided orthogonal to each other, and a required short probe is grounded according to the received polarization. And a linearly polarized wave receiving apparatus configured to remove cross polarized waves due to non-received polarized waves. 2. The first probe is for receiving vertically polarized waves, the second probe is for receiving horizontally polarized waves, the second shorting probe is grounded when receiving vertically polarized waves, and the second probe is used when receiving horizontally polarized waves. 2. The linearly polarized wave receiving apparatus according to claim 1, wherein one shorting probe is grounded. 3. A printed circuit board is provided on a side surface of the circular waveguide, and legs of the first probe, the second probe, the first short probe, and the second short probe are respectively connected to conductive portions. The linearly polarized wave reception device according to claim 1 or 2, wherein 4. The linearly polarized wave receiving apparatus according to claim 3, wherein the first shorting probe or the second shorting probe is connected to a ground conductor provided on the printed circuit board to be grounded.