JPH0936605A - Outdoor converter for satellite broadcasting reception - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give the advantage of miniaturization and cost reduction by obtaining sufficient isolation without securing a distance of about one wavelength of the reception object radio wave between a first probe and a short- circuit terminal for a second probe and reducing the number of parts. SOLUTION: A part of a circuit board 11 having a micro strip line is extended to a position which is about 1/4 wavelength apart from a first probe 13 for first linearly polarized wave detection, which is arranged in a waveguide 10, in the going direction of the object radio wave (the direction of an arrow A), and a short-circuit pattern 15 for the first probe 13 and a second probe 16 for second linearly polarized wave detection are provided on both of front and rear faces of this extended part. A short-circuit face 12b (the inside bottom face of a metallic case 12) for the second probe 16 is arranged in the position which is about 1/4 wavelength apart from the second probe in the radio wave going direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outdoor converter for receiving satellite broadcasting, which is equipped with a coaxial waveguide converter for receiving two types of independent linearly polarized signals and is mounted on an outdoor antenna device.

[0002]

5 to 7 are for explaining a conventional example of this type of outdoor converter. FIG. 5 is an external view, FIG. 6 is a side sectional view, and FIG. 7 is a front view.

As shown in these figures, in the conventional product, a waveguide 1 formed in a bottomed cylindrical shape is provided at a predetermined position along the traveling direction (direction of arrow A) of the radio wave transmitted from the satellite. Sequentially
A first probe 2 for detecting a first linearly polarized wave (for example, a horizontal polarized wave); a short-circuit rod 3 for reflecting the first linearly polarized wave to cause the first probe 2 to detect the first linearly polarized wave; And a second probe 4 for detecting a second linearly polarized wave (for example, a vertically polarized wave) orthogonal to the linearly polarized wave of Is formed as a short-circuit surface 1b for reflecting light to be detected by the second probe 4. Here, the distance between the first probe 2 and the short-circuit rod 3, and the second
The distance between the probe 4 and the short-circuit surface 1b is set to about 1/4 wavelength of the radio wave to be received in order to suppress the conversion loss, and the first probe 2 and the second probe 2 The distance from the probe 4 is set to about 3/4 wavelength of the target radio wave to be received so that polarized signals detected by the probes 2 and 4 do not interfere with each other and deteriorate the isolation. There is. The short-circuit rod 3 and the short-circuit surface 1b
Are connected to a ground electrode (not shown).

On the other hand, outside the waveguide 1, a first circuit board 5 for holding the first probe 2 by connecting it to a wiring pattern (microstrip line) and a second probe 4 are provided.
And a second circuit board 6 for connecting and holding the wiring pattern (microstrip line). Further, an output connector 8 for outputting a reception signal is projected outward from the bottom surface of the housing 7 that covers the above-described components. It should be noted that the first and second circuit boards 5 and 6 each have a processing circuit for appropriately processing (amplifying, frequency converting, etc.) the signals detected by the first probe 2 and the second probe 4. It is provided.

[0005]

By the way, in the above-mentioned conventional outdoor converter for receiving satellite broadcasting, the first and second probes 2 and 4 projecting into the waveguide 1 in directions orthogonal to each other are used to travel the radio wave. By arranging them in the direction of about 3/4 wavelength, it is designed to have good isolation. In this structure, the first probe 2 and
Since it is necessary to secure a distance of about one wavelength of the target radio wave to be received from the short-circuit surface 1b for the second probe 4, there is a problem that it is difficult to downsize the device.
Further, in such a conventional structure, the first probe 2, the short-circuit bar 3, and the second probe 4 which are independent components are combined with the waveguide 1, and the probes 2 and 4 are further connected to different circuit boards 5, respectively. Since it is connected to 6, the number of parts is large, which has been a factor of increasing the cost.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to provide an outdoor converter for satellite broadcasting reception which is advantageous in downsizing and cost reduction.

[0007]

The above-mentioned object of the present invention is to provide a waveguide in which broadcast radio waves entering a pipe travel as first linearly polarized waves and second linearly polarized waves orthogonal to each other.
A first probe which is arranged at a predetermined position in the waveguide to detect the first linearly polarized wave, and a first probe which is arranged at a position apart from the first probe by about 1/4 wavelength in a radio wave traveling direction, A first short-circuit terminal that reflects a first linearly polarized wave;
A second probe which is arranged in the vicinity of the short-circuit terminal for detecting the second linearly polarized wave, and a second probe which is arranged at a position apart from the second probe by about 1/4 wavelength in the radio wave traveling direction. And a second short-circuit terminal that reflects the linearly polarized wave of.

For example, a substrate is arranged at a position apart from the first probe in the radio wave traveling direction by about 1/4 wavelength, and the first short circuit is made on the surface on the first probe side of both front and back surfaces of the substrate. A terminal may be provided and the second probe may be provided on the other surface. Further, it is preferable that a part of a circuit board provided with a circuit for processing the signals detected by the first and second probes is extended as the board into the waveguide.

[0009]

As described above, if the first short-circuit terminal and the second probe are arranged at positions apart from the first probe in the radio wave traveling direction by about ¼ wavelength, the first probe and the second probe can be arranged. Since the distance from the short-circuited terminal is about 1/2 wavelength of the target radio wave to be received, good isolation is obtained and
The miniaturization of the device can be promoted. If the first short-circuit terminal and the second probe are formed on both the front and back surfaces of the board, the number of parts can be reduced, and a part of the circuit board provided with the polarization signal processing circuit can be used as the board. With
The number of parts can be further reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an outdoor converter for receiving satellite broadcasting according to the present invention will be described below with reference to FIGS. Here, FIG. 1 is a side sectional view of the present embodiment, FIG. 2 is a front view of the same embodiment, FIG. 3 is a rear view showing the internal structure of the same embodiment,
FIG. 4 is an external view of the same embodiment.

In these figures, the waveguide indicated by reference numeral 10 is formed in a tubular shape with both ends open, and a circuit board 11 having a microstrip line formed at the rear opening end 10a. And a metal case 12 having a bottom and a collar portion 12a.
1 is installed at a position where the opening end 10a is closed. Further, in the waveguide 10, a first linearly polarized wave (for example, a horizontally polarized wave) is detected at a position in front of the circuit board 11 behind the same by about a quarter wavelength of the target radio wave.
The probe 13 of is arranged. The first probe 13 is substantially L-shaped, has its base end connected to the circuit board 11, and has a portion linearly extending from the base end covered with an insulating member 14 such as Teflon to guide the waveguide 10. After being incorporated in the concave groove 10b, the tip side is projected into the waveguide 10 by a predetermined dimension. Then, of the front and back surfaces of the circuit board 11 which are orthogonal to the axial direction of the waveguide 10, the surface on the first probe 13 side reflects the first linearly polarized wave to generate the first linearly polarized light. Of the second linear polarization (for example, vertical polarization) orthogonal to the first linear polarization is detected on the other surface. Probe 16 is patterned. Here, the board thickness of the circuit board 11 is negligible compared to the wavelength of the target radio wave to be received, so that
Both the short circuit pattern 15 and the second probe 16 are located at a distance of about ¼ wavelength from the first probe 13 in the radio wave traveling direction (direction of arrow A). Further, in this embodiment, the inner bottom surface of the metal case 12 is
The short-circuit surface 12b for reflecting the linearly polarized wave of No. 2 and causing the second probe 16 to detect it.

The circuit board 11 is provided with a processing circuit for appropriately processing (amplifying, frequency converting, etc.) the signals detected by the first probe 13 and the second probe 16, These first and second probes 13,
As shown in FIG. 3, 16 are respectively connected to the first stage amplifier transistors 21 and 22 via the lead patterns 19 and 20 on the circuit board 11. Further, the metal case 12 is previously provided with escape recesses 12c and 12d for avoiding contact with the lead patterns 19 and 20.

The portion of the circuit board 11 arranged in the waveguide 10 has a cutout 11b as shown in FIGS.
Is formed into a substantially T shape, and the short circuit pattern 15 and the second probe 16 are formed in the substantially T shape part. That is, by providing the notch 11b, the radio wave detected by the second probe 16 (the second
It is designed so that the linearly polarized wave of) is not attenuated.

On the other hand, the waveguide 1 is provided on both front and back surfaces of the circuit board 11.
A ground electrode 17 made of a solder-plated layer is provided at a position corresponding to the peripheral edge of the rear opening end 10a of 0, and the ground electrodes 17 on both surfaces are arranged along the peripheral edge of the open end 10a. Through hole 1 provided in large numbers in 11
The short circuit pattern 15 is connected to the ground electrode 17 while being connected via 1a. Further, the flange portion 12 a of the metal case 12 is provided with the waveguide 10 via the circuit board 11.
The waveguide 10 and the metal case 12 are in pressure contact with the ground electrodes 17 on both surfaces of the circuit board 11, respectively, since they are fixed to the peripheral edge of the opening end 10a of the circuit board 11 with screws 18. The circuit board 11 and the metal case 12 attached to the rear portion of the waveguide 10 are located in the housing 23, which is a circuit housing portion, and are covered with the cover 24. And this case 2
An output connector 25 for outputting a reception signal is provided so as to project from the inside to the outside.

As described above, in this embodiment, the circuit board 11 is extended at a position separated from the first probe 13 by about 1/4 wavelength in the radio wave traveling direction, and short-circuit patterns are formed on both front and back surfaces of this extended portion. Since the first probe 13 and the second probe 16 are provided, the distance between the first probe 13 and the short-circuit pattern 15 and the distance between the second probe 16 and the short-circuit surface 12b are set as the reception target in order to suppress conversion loss. If it is set to about 1/4 wavelength of the radio wave that becomes, the distance between the first probe 13 and the short-circuit surface 12b can be shortened to about 1/2 wavelength of the radio wave to be received, compared to the conventional product. Therefore, an outdoor converter that is advantageous for miniaturization can be obtained. Moreover, the first probe 1
If the distance between 3 and the short-circuit surface 12b is set to about 1/2 wavelength, there is no concern that polarized signals detected by the probes 13 and 16 interfere with each other to deteriorate the isolation.

Further, as in this embodiment, the first and second
Connect the probes 13 and 16 of the above to one circuit board 11,
In addition, the short circuit pattern 15 and the second
If the probe 16 is formed, the number of parts can be significantly reduced as compared with the conventional product, so that the cost reduction can be facilitated easily. Moreover, in the case of this embodiment, by tightening the screw 18 when mounting the metal case 12,
Since the ground electrode 17 made of the solder plating layer is appropriately crushed, the ground electrode 17 and the waveguide 10 and the metal case 12 (short-circuit surface 12b) can be reliably connected, and stable characteristics can be obtained. It is like this.

[0017]

As described above, the outdoor converter for satellite broadcast reception according to the present invention is suitable for the short-circuit terminal for the first probe for detecting the first linearly polarized wave and the first linearly polarized wave. Since both the second probes that detect the second linearly polarized waves that are orthogonal to each other are arranged at positions apart from the first probe by about 1/4 wavelength in the radio wave traveling direction,
The distance from the short-circuit terminal for the second probe can be set to about 1/2 wavelength of the target radio wave to be received, good isolation can be obtained, and miniaturization of the device can be promoted. Produce an effect. If the first short-circuit terminal for the probe and the second probe are formed on both the front and back surfaces of the board by utilizing the extended portion of the circuit board, the number of parts can be reduced and the cost can be reduced. It has an excellent effect that it can be promoted.

[Brief description of drawings]

FIG. 1 is a side sectional view of the present embodiment.

FIG. 2 is a front view of the embodiment.

FIG. 3 is a rear view showing the internal structure of the embodiment.

FIG. 4 is an external view of the same embodiment.

FIG. 5 is an external view of a conventional example.

FIG. 6 is a side sectional view of the conventional example.

FIG. 7 is a front view of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Waveguide 10a Rear opening end 11 Circuit board 11a Through hole 12 Metal case 12b Short-circuit surface (2nd short-circuit terminal) 13 1st probe 15 Short-circuit pattern (1st short-circuit terminal) 16 2nd probe 17 Ground electrode

Front page continuation (72) Inventor Ryo Shigehara 1-7 Yukiya Otsuka-cho, Ota-ku, Tokyo Alps Electric Co., Ltd.

Claims (7)

[Claims] 1. A waveguide in which broadcast radio waves that have entered the tube travel as first linearly polarized waves and second linearly polarized waves that are orthogonal to each other, and the first waveguide is arranged at a predetermined position in the waveguide.
And a first short-circuit terminal for reflecting the first linearly polarized wave by arranging the first probe for detecting the linearly polarized wave and And a second probe which is arranged in the vicinity of the first short-circuit terminal to detect the second linearly polarized wave, and a position which is separated from the second probe by about 1/4 wavelength in the radio wave traveling direction. And a second short-circuit terminal for reflecting the second linearly polarized wave, and an outdoor converter for satellite broadcast reception. 2. The substrate according to claim 1, wherein the substrate is arranged at a position apart from the first probe by about 1/4 wavelength in a radio wave traveling direction, and one of the front and back surfaces of the substrate on the side of the first probe is disposed. An outdoor converter for satellite broadcasting reception, characterized in that the first short-circuit terminal is provided on one surface and the second probe is provided on the other surface. 3. The method according to claim 2, wherein a part of a circuit board provided with a circuit for processing a signal detected by the first and second probes is extended into the waveguide and the extension is performed. An outdoor converter for receiving satellite broadcasts, characterized in that the installation part is the substrate. 4. The method according to claim 2 or 3, wherein the substrate is installed at an open end of the waveguide, and a bottomed metal case is placed at a position where the open end is closed with the substrate interposed therebetween. An outdoor converter for satellite broadcast reception, wherein the converter is installed and the inner bottom surface of the metal case serves as the second short-circuit terminal. 5. The ground electrode according to claim 4, wherein ground electrodes are provided on both front and back surfaces of the substrate at locations corresponding to the peripheral edge portions of the opening end, and through-holes provided on the substrate for ground electrodes on both surfaces are formed. An outdoor converter for receiving satellite broadcasts, characterized in that the waveguide and the metal case are pressure-contacted to the ground electrodes on both sides thereof, respectively. 6. The outdoor converter for satellite broadcast reception according to claim 5, wherein a large number of the through holes are provided along a peripheral edge portion of the opening end. 7. The outdoor converter for satellite broadcast reception according to claim 5, wherein the ground electrode is made of a solder plating layer.