JP3155684B2 - Probe mounting structure for outdoor converter for satellite broadcasting reception - Google Patents

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 which is mounted on an outdoor antenna device. The present invention relates to a mounting structure of the probe.

[0002]

2. Description of the Related Art A conventional probe mounting structure for an outdoor converter of this type will be described with reference to a side sectional view of FIG. 5 and a front view of FIG.

[0005] In FIG. 5 and FIG. 6, a waveguide denoted by reference numeral 1 has a rectangular outer shape but a cylindrical inner shape. When a radio wave transmitted from a satellite enters the waveguide 1, the waveguide has a rectangular shape. The radio waves are converted into a first linear polarization and a second linear polarization orthogonal to each other. A rod-shaped first probe 2 for detecting a first linearly polarized wave (for example, a horizontally polarized wave) is sequentially provided at a predetermined position in the waveguide 1 along the traveling direction of the target radio wave (the direction of arrow A). And a short-circuit rod 3 for reflecting the first linearly polarized wave so as to be detected by the first probe 2.
And a rod-shaped second probe 4 for detecting a second linear polarization (eg, vertical polarization) orthogonal to the first linear polarization.
Are arranged, and the inner bottom surface of the waveguide 1 is formed as a short-circuit surface 1b for reflecting the second linearly polarized wave and causing the second probe 4 to detect it. Here, the distance between the first probe 2 and the short-circuit bar 3 and the distance between the second probe 4 and the short-circuit surface 1b are all about １ ／ wavelength of the radio wave to be received in order to suppress the conversion loss. Is set to Further, the short-circuit bar 3 and the short-circuit surface 1b are both connected to a ground electrode (not shown).

On the other hand, outside the waveguide 1, a first circuit board 5 for connecting the first probe 2 to a wiring pattern (microstrip line), and a second probe 4 for connecting the second probe 4 to the wiring pattern (microstrip line). 2) and the second circuit board 6 to be connected. Each probe 2,
An insulating member 7 such as Teflon is attached to a portion of the waveguide 4 which penetrates the waveguide 1 in order to secure insulation from the waveguide 1. In addition, each of the circuit boards 5 and 6, respectively,
A processing circuit is provided for appropriately processing (amplifying, converting frequency, etc.) the signals detected by the first probe 2 and the second probe 4.

[0005]

In the prior art described above, the rod-shaped probes 2 and 4 protruding into the waveguide 1 in directions orthogonal to each other are arranged at a predetermined distance in the radio wave traveling direction. Is designed so that the polarization signals detected by the probes 2 and 4 do not cause interference, that is, the isolation is good.
In this structure, the base ends of the probes 2 and 4 cannot be connected to the same circuit board. Therefore, conventionally, the first and second circuit boards 5 and 6 are provided outside the waveguide 1. However, if two circuit boards are incorporated in this way, the manufacturing process becomes complicated and the cost is increased. There was a problem that it was done. Further, since these two circuit boards 5 and 6 must be arranged at right angles to each other and parallel to the waveguide 1, it is necessary to enlarge the outer shape of the waveguide 1 and flatten its outer surface. A substrate support structure is required, and this has a drawback that it hinders miniaturization and weight reduction of the device.

An object of the present invention is to provide a probe mounting structure for an outdoor converter for receiving satellite broadcasting which is suitable for cost reduction, size reduction, and weight reduction. .

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a waveguide in which a broadcast wave entering a tube travels as two types of linearly polarized waves which are orthogonal to each other, and an open end of the waveguide. A circuit board disposed orthogonally to the axial direction of the waveguide, and detecting one of the linearly polarized waves extending substantially in an L-shape from a base end connected to the circuit board and traveling in the waveguide; A groove extending along the axial direction of the inner wall of the waveguide and exposed at the open end, and a portion of the probe that extends linearly from the base end is provided with the concave portion. Insulated in the groove,
This is achieved by protruding a portion on the tip side of the linear portion into the waveguide.

[0008]

In the above-described probe mounting structure, the portion protruding into the waveguide on the distal end side of the substantially L-shaped probe and the circuit board connected to the base end of the probe can be set in parallel with each other. The other probe can be connected to the circuit board, and the number of circuit boards conventionally required two can be reduced to one. In addition, since the circuit board is disposed at the open end of the waveguide at right angles to the axial direction of the waveguide, it is not necessary to increase the size of the device to support the circuit board, and the outer shape of the waveguide is also reduced. Can be smaller.

[0009]

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, and FIGS. 3 and 4 are explanatory views showing a method of attaching the first probe to the waveguide in the same embodiment. is there.

In these figures, a waveguide indicated by reference numeral 10 is formed in a cylindrical shape having both ends open, and a rear opening end 10a is orthogonal to the axial direction of the waveguide 10. A part of the circuit board 11 installed in the plane is extended, and a metal case 12 having a bottomed and flanged portion 12a is further provided.
However, the opening end 10a is provided at a position where the lid is closed via the circuit board 11. In the waveguide 10, a first linearly polarized wave (for example, a horizontally polarized wave) is detected at a position about 約 wavelength before the target radio wave to be received from the circuit board 11 behind it. Are arranged. The first probe 13 is substantially L-shaped, and has a base end connected to the circuit board 11 and a portion extending linearly from the base end covered with a cylindrical insulating member 14 made of Teflon or the like. It is built in the concave groove 17 of the waveguide 10, and the tip side is projected into the waveguide 10 by a predetermined dimension. That is, the rear end portion of the inner wall of the waveguide 10 is provided with a concave groove 17 extending along the axial direction thereof and exposed at the opening end 10a. A portion extending linearly from the base end is incorporated in the concave groove 17 in an insulated state. As is apparent from FIG. 4, the concave groove 17 has a narrow slit portion 17a exposed on the inner wall surface 10b of the waveguide 10, and is wider than the slit portion 17a and is guided through the slit portion 17a. A wide portion 17b facing the inside of the wave tube 10; and the cross-sectional shape of the wide portion 17b is a circle having an inner diameter substantially equal to the outer diameter of the insulating member 14.

The first linearly polarized wave is reflected on the first probe 13 side surface of the front and back surfaces of the circuit board 11 orthogonal to the axial direction of the waveguide 10. A short-circuit pattern 15 is provided for the first probe 13 to detect the second linear polarization (for example, vertical polarization) orthogonal to the first linear polarization. The second probe 16 is patterned. Here, since the thickness of the circuit board 11 is negligibly small compared to the wavelength of the radio wave to be received, both the short-circuit pattern 15 and the second probe 16 travel from the first probe 13 to the radio wave. In other words, it is located at a distance of about 1/4 wavelength in the direction (arrow A direction). Further, in the present embodiment, the inner bottom surface of the metal case 12 is formed as a short-circuit surface 12b for reflecting the second linearly polarized wave and causing the second probe 16 to detect the second linearly polarized wave.

The circuit board 11 is provided with a processing circuit for appropriately processing (amplifying, converting frequency, etc.) the signals detected by the first probe 13 and the second probe 16. A portion of the circuit board 11 arranged in the waveguide 10 is processed into a substantially T-shape by providing a notch 11a as shown in FIG. 2, and the short-circuit pattern 15 and the second Probe 16 is formed. In other words, by providing the notch 11a, the radio wave (second linearly polarized wave) detected by the second probe 16
Is considered so that it does not attenuate. A ground electrode (not shown) is provided at a position corresponding to the periphery of the rear opening end 10a of the waveguide 10 on both the front and back surfaces of the circuit board 11, and the short-circuit pattern 15 is connected to the ground electrode. It is. Further, since the flange 18a of the metal case 12 is fixed to the periphery of the open end 10a of the waveguide 10 via the circuit board 11 by tightening the screw 18, the waveguide 10 is connected to the ground electrode. And the metal case 12 are pressed against each other.

Here, the procedure for attaching the substantially L-shaped first probe 13 to the waveguide 10 will be described.
As shown in FIG. 3, the bent portion 13a of the first probe 13
Is aligned with the groove 17 exposed at the rear opening end 10a of the waveguide 10, and the bent portion 13a is
7 may be inserted. In this insertion process, the first probe 13 is configured such that the distal end portion of the bent portion 13a is guided by the slit portion 17a, and the attached insulating member 14 is
7b, it can be easily assembled at a predetermined position in the concave groove 17. Also, of the first probe 13 thus attached to the waveguide 10, the linear portion inserted into the concave groove 17 becomes a coaxial line and guides the received signal to the circuit board 11. By appropriately selecting the thickness of the insulating member 14, the thickness of the insulating member 14, the dielectric constant, the inner diameter of the wide portion 17b, and the like, a predetermined impedance can be accurately set. Similarly, the length of the portion of the first probe 13 protruding into the waveguide 10 can be accurately set by the shape of the concave groove 17 and the like. The operation of connecting the base end of the first probe 13 to the circuit board 11 is performed by the probe 13
May be attached to the waveguide 10 before or after it is attached.

As described above, in the present embodiment, the portion of the substantially L-shaped first probe 13 protruding into the waveguide 10 at the distal end and the circuit board 1 connecting the proximal end of the probe 13 are connected.
1 are parallel to each other, a short-circuit pattern 15 for the first probe 13 and a second probe 16 can be provided on both the front and back surfaces of the circuit board 11. And the second probe 16
Can be regarded as a part of the circuit board 11. As a result, the number of circuit boards previously required for each probe can be reduced from two to one, and short-circuit rods and probes, which had to be handled as individual parts, can be omitted, greatly reducing the number of parts. Have been.

In this embodiment, the circuit board 11 is arranged at the rear opening end 10a of the waveguide 10 so as to be orthogonal to the axial direction of the waveguide 10. It is not necessary to increase the size of the waveguide 10 or complicate its shape in order to support it, and therefore, it is easy to reduce the size of the device. Since the circuit board 11 is located at a position about 1/4 wavelength away from the first probe 13 in the radio wave traveling direction, the distance between the first probe 13 and the short-circuit pattern 15 and the second Probe 16
If the distance between the first probe 13 and the short-circuit surface 12b is set to about １ ／ wavelength of the radio wave to be received in order to suppress the conversion loss, the distance between the first probe 13 and the short-circuit surface 12b will be reduced. This can be shortened to about 波長 wavelength as compared with the conventional product, and an outdoor converter more advantageous for miniaturization can be obtained. In addition, if the distance between the first probe 13 and the short-circuit surface 12b is set to about １ ／ wavelength, each probe 13, 16
There is no fear that the polarization signals detected by the above interfere with each other to degrade the isolation.

[0016]

As described above, in the probe mounting structure according to the present invention, a circuit board is arranged at the open end of the waveguide so as to be orthogonal to the axial direction, and a substantially L-shaped circuit board is connected to the circuit board. Since the probes are incorporated in a concave state in the concave groove of the inner wall of the waveguide, each probe corresponding to two types of linearly polarized waves can be connected to the same circuit board, and a substantially L-shaped probe is provided on the circuit board. Short-circuit terminals can be provided, and it is not necessary to increase the size of the device to support the circuit board. Thus, the number of components, cost, size, and weight of the outdoor converter for satellite broadcast reception can be reduced. It has an excellent effect that it can be easily promoted.

[Brief description of the drawings]

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

FIG. 2 is a front view of the embodiment.

FIG. 3 is an explanatory diagram showing a procedure for incorporating a first probe into a waveguide in the embodiment.

FIG. 4 is an explanatory diagram showing a state in which a first probe is incorporated in a waveguide in the embodiment.

FIG. 5 is a side sectional view showing a conventional example of a probe mounting structure.

FIG. 6 is a front view of the conventional example.

[Explanation of symbols]

 Reference Signs List 10 waveguide 10a rear open end 11 circuit board 12 metal case 13 first probe 14 insulating member 15 short circuit pattern 16 second probe 17 concave groove 17a slit portion 17b wide portion

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Ryo Shigihara 1-7 Yukiya Otsuka-cho, Ota-ku, Tokyo Alps Electric Co., Ltd. (56) References JP-A-6-283913 (JP, A) JP-A Sho 60-103802 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01P 1/161 H01P 5/107

Claims (6)

(57) [Claims] 1. A waveguide in which a broadcast radio wave entering a pipe travels as two kinds of linearly polarized waves orthogonal to each other, and is disposed at an open end of the waveguide so as to be orthogonal to an axial direction of the waveguide. A circuit board, and a probe that extends in a substantially L shape from a base end connected to the circuit board and detects one of the linearly polarized waves traveling in the waveguide; and an inner wall of the waveguide. A groove extending along the axial direction of the probe and exposed at the opening end, and a portion of the probe that extends linearly from the base end is installed in the groove in an insulated state, and the linear A probe mounting structure for a satellite broadcast receiving outdoor converter, wherein a portion closer to the tip end than the portion protrudes into the waveguide. 2. The cross-sectional shape of the concave groove of the waveguide according to claim 1, wherein a cross-sectional shape of the concave groove is such that a narrow slit portion whose opening side is exposed to an inner wall surface of the waveguide and a slit portion whose bottom side is this slit portion. A wide part which is wider than the slit part and faces the inside of the waveguide through the slit part. 3. The probe mounting structure according to claim 2, wherein the wide portion has a circular cross section. 4. A probe mounting structure for an outdoor converter for receiving satellite broadcasting according to claim 1, wherein a portion of said probe to be incorporated in said concave groove is covered with an insulating member. . 5. The probe according to claim 1, wherein the probe is detected on a surface of the circuit board in a region facing a tip portion of the probe protruding into the waveguide. A probe mounting structure for an outdoor converter for satellite broadcast reception, comprising a short-circuit terminal for reflecting linearly polarized waves. 6. The outdoor for satellite broadcasting reception according to claim 5, wherein the distance between the tip portion of the probe and the short-circuit terminal is set to about １ ／ wavelength of the target radio wave. Converter probe mounting structure.