JP3387018B2 - Orthogonal bi-polarized waveguide input device and converter for receiving satellite broadcasting using the orthogonal bi-polarized waveguide input device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an orthogonal two-polarization waveguide input device, and more particularly to a satellite broadcast / satellite communication receiving converter (for receiving two radio waves whose polarization planes are orthogonal to each other). LNB), etc., improvement of an orthogonal dual-polarization waveguide input device characterized by the structure of a probe forming the waveguide input part, and satellite broadcasting / satellite communication reception using such orthogonal dual-polarization waveguide ( Hereinafter referred to as "satellite broadcast reception".) Converter.

[0002]

2. Description of the Related Art Known as this type of orthogonal dual polarization waveguide is disclosed in Japanese Patent Laid-Open No. 10-261902. An example of a conventional orthogonal dual polarization waveguide input device will be described with reference to FIG. 8A is a front sectional view, FIG. 8B is a side view, and FIG.
(C) is a plan view. In particular, FIG. 8A is a cross-sectional view taken along the line I-I of FIG. 8C.

The orthogonal two-polarization waveguide input device 80 is mounted on the waveguide 1a for introducing the polarized wave and in the direction parallel to the polarization plane 2 of the vertical polarized wave and receives the vertical polarized wave. And a probe 90 having a core conductor 9 bent substantially at a right angle, which is attached to the waveguide 1a such that the tip portion 9a is parallel to the polarization plane 3 of the horizontal polarization. Wave tube 1
The short-circuit rod 6 provided in the vertical direction and the core conductors of the probe 5 and the probe 90 are attached so as to be at right angles to the lower surface of the waveguide 1 slightly inside the center of the inside of the waveguide 1.
a circuit board 4 attached to the riding surface of a.

The waveguide 1a has a short-circuit wall 8 formed on its inner wall.
A probe 5 and a short-circuit rod 6 are installed to feed the vertically polarized wave and transmit the polarized signal to the circuit board. In addition, a probe 90 and a short-circuit wall 8 are provided for feeding horizontal polarized waves and transmitting polarized signals to the circuit board.

Referring to FIG. 9, the tip portion 9a of the core conductor 9 of the probe 90 is bent at a substantially right angle in the direction in which it projects into the inner wall of the waveguide 1a. Probe 90 further around the central core conductor 9 including enclose dielectrics 10. Corrugating conductor 9
It is arranged approximately in the center of the dielectrics 10. Probe 90
Is inserted from above into the cavity formed in the waveguide 1a. FIG. 8 shows a state after mounting the probe 90. Thus when inserting the probe 90 from above, not only a space for the dielectrics 10,
Space for the tip 9a is also required, and the waveguide 1a
The opening has a shape that allows it.
Therefore, as shown in FIG. 8, the cavity 1b is formed in the state where the probe 90 is mounted.

Probes 5 and 90 receive each of the two orthogonal polarizations. The probe 5 transmits the received polarization signal of the polarization plane 2 of the vertical polarization to the circuit board 4. Probe 90
Is the circuit board 4 that receives the polarization signal of the polarization plane 3 of the horizontal polarization
Communicate to. The circuit board 4 combines the polarized signal transmitted from the probe 5 and the polarized signal transmitted from the probe 90.

[0007]

In the prior art orthogonal dual polarization waveguide input device 80 shown in FIGS. 8 and 9, an opening is formed in the waveguide 1a for attaching the probe 5 and the probe 90. It is necessary to provide. Further core conductor 9
Is L-shaped, the probe 90 is connected to the waveguide 1a.
As described above, the cavity 1b remains inside the waveguide of the probe 90 in the state of being mounted on the probe 90.

When the cavity 1b is present in this way,
An unfavorable effect such as signal loss or signal interference occurs in a polarized signal having an extremely high frequency. In order to improve this, it is necessary to give a high degree of consideration to the layout of the circuit pattern on the circuit board 4, for example. Therefore, there is a problem that the circuit pattern design becomes difficult. Further, it is necessary to consider the problems peculiar to the circuit board that handles high-frequency signals, which makes the circuit pattern design more difficult.

An example of a device using such an orthogonal dual-polarization waveguide device is a satellite broadcast receiving converter. However, even in the satellite broadcast receiving converter, the above-mentioned problems of the orthogonal dual-polarization waveguide device still remain a problem. It is a point.

[0010]

The present invention has been made to solve the above problems.
An object of the invention described in claim 1 or claim 2 is to provide an orthogonal dual-polarization waveguide input device that has a simple circuit design and can obtain good reception characteristics. .

An object of the invention described in claim 3 is to provide a converter for satellite broadcast reception having a can circuit design to obtain a simple and good reception characteristics, two orthogonally polarized waveguide input apparatus It is in.

[0013]

[0014]

[0015]

[0016]

An orthogonal dual-polarization waveguide input device according to a first aspect of the present invention has a first polarization plane and a second polarization plane that have first polarization planes orthogonal to each other. A waveguide whose one end is open and the other end is closed by a short-circuit wall for introducing and propagating two orthogonal polarizations including a second polarization which it has, and a first polarization plane A first probe for projecting parallel to the inner wall of the waveguide, the first probe for receiving the first polarized wave, and a tip of the first probe projecting parallel to the second plane of polarization on the inner wall of the waveguide. A second probe for receiving the second polarized wave, and provided on the outer peripheral wall of the waveguide parallel to the second plane of polarization and connected to the first probe and the second probe. , Receiving and synthesizing the first polarization signal received by the first probe and the second polarization signal received by the second probe. And a waveguide having an opening for a second probe formed parallel to the first plane of polarization for inserting the second probe, and the second probe is a central core conductor distal end portion is formed into a shape substantially perpendicularly protrudes axially, the circumference of the central core conductor, and dielectrics layer distal end portion of the central core conductor formed over so as to expose , The area of the dielectric layer exposed in the cavity generated when the second probe is inserted into the opening for the second probe.
And a conductive layer formed so as to cover the entire surroundings .

According to this orthogonal dual polarization waveguide input device,
Since the tip of the core conductor of the second probe is formed in a shape projecting almost at right angles to the axial direction, this second probe is axially formed into an opening for the second probe of the waveguide. A simple operation of inserting allows the orthogonal dual-polarization waveguide input device to be assembled so as to receive polarized waves in a plane of polarization orthogonal to the axis of the second probe. At this time, the second
The opening for the second probe must have a cross-sectional area through which the tip of the core conductor passes,
After insertion into the opening for the probe, this part remains a cavity. However, the surface of the second probe surrounding dielectrics layer since the conductive layer is formed, the second probe can be adapted to the impedance of the polarization,
By using this second probe, signal loss, interference, etc. due to a polarization signal having an extremely high frequency can be reduced and good reception characteristics can be obtained.

The two orthogonally polarized waveguide input apparatus according to the invention of claim 2, in addition to the configuration of the invention according to claim 1, conductive layer of the second probe comprises a thin metal layer.

The converter for receiving satellite broadcasting according to the invention of claim 3, the two orthogonally polarized waveguide input apparatus according to the invention described in any one of claims 1 to 2, two orthogonal Henhashirube And a conversion circuit for obtaining an intermediate frequency signal from the output of the wave tube input device.

Therefore, similar to the effect of the orthogonal dual-polarization waveguide input device according to any one of claims 1 to 2 , the assembly is easy and the signal loss due to the polarization signal having an extremely high frequency, It is possible to provide a converter for satellite broadcast reception that can obtain good reception characteristics with reduced interference.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. An orthogonal dual-polarization waveguide input device 1 according to the first embodiment will be described with reference to FIG. In the following description, the orthogonal 2 described in FIGS.
The same elements as those of the polarization waveguide input device are designated by the same reference numerals. Therefore, detailed description thereof will not be repeated here.

[0022] With reference to FIG. 1 probe 7 according to this embodiment is different from the probe 90 in the prior art shown in FIG. 9, formed on the surface facing the dielectrics 10, the inner waveguide 1a The metal thin film 11 is further included. By covering this way the dielectrics 10 surface with a conductive layer such as a thin metal film 11, the central core conductor 9 so as to match the impedance despite two orthogonally polarized surrounds in dielectrics 10 The probe 7 can be configured. Therefore, it is possible to obtain better reception characteristics than in the case where the probe 90 shown in FIG. 9 is used.

Referring to FIG. 2, the probe 7 is the probe 9
0 (see FIG. 8) is attached to the waveguide 1a. However, it differs from the probe 90 in that the metal thin film 11 is formed so that the metal thin film 11 faces the cavity portion 1b side.

As the waveguide 1a, zinc die cast, aluminum die cast, etc. are mainly used at present. The probe 5 and 7, good formability in Yuden include polyethylene resin such as Teflon is mainly used. As the core conductor 9, a material that allows radio waves to pass therethrough, mainly a metal such as brass or nickel is used. Of course, the materials listed here are only general ones, and any material, including those to be developed in the future, can be used as long as it has suitable properties for each function. it can.

It should be noted, with reference to FIG. 3, the metal thin film 11 in the apparatus of this embodiment, among the surfaces of the dielectrics 10, so as to cover the slightly wider portions than the portion corresponding to the width of the cavity 1b It is formed. Thus, the metal thin film 11 has the cavity 1b
Must be formed so as to be wider than the width of the cavity, and it is not effective if it is narrower than the cavity 1b. The thin metal film 11, generally may With those easily formed as a thin film covering the or One dielectrics 10 surface is easy to conductor through a radio wave, for example phosphor bronze, may be used copper or the like.

Referring to FIGS. 4 and 5, band data of the orthogonal dual polarization waveguide input device according to the present embodiment (FIG. 5)
Will be described in comparison with the conventional example (FIG. 4). In the orthogonal dual-polarization waveguide input device according to the present embodiment, it is possible to more effectively prevent an increase in signal loss, interference, etc. in a polarization signal having an extremely high frequency as compared with the conventional device. Therefore, as shown in FIG. 5, it exhibits a wider band and better characteristics than the conventional band of FIG. Therefore, the use of the orthogonal dual-polarization waveguide input device of the present invention simplifies the circuit pattern design because no high-level consideration is required in routing the circuit pattern. Further, in processing and assembling for mounting the circuit board, there is no need to consider the fact that the board handles high-frequency signals.

FIG. 6 is a satellite broadcast receiving converter 61 using the orthogonal dual polarization waveguide input device according to this embodiment.
FIG. 3 is an exploded perspective view showing the assembly structure of FIG. With reference to FIG. 6, the opening 1 of the chassis body 45 including the circular waveguide 1a
The probe 5 and the probe 7 shown in FIG. 3 are inserted into d and the opening 1c, respectively. At this time, the circuit board 4 is installed so that the core conductors of the probes 5 and 7 penetrate through the holes formed on the circuit board 4, respectively. Incidentally, when inserting this way the probe 7 into the opening 1c for the probe 7, so as to pass through the tip portion 9a of the center core conductor 9 of probe 7, the cross-sectional area of the opening 1c is than the cross-sectional area of dielectrics 10 After the probe 7 is inserted, the hollow portion 1b remains as described above. However, the cavity 1 of the probe 7
The dielectrics 10 surface portions exposed by b, the metal thin film 11 is formed as described above, the probe 7 is configured to fit to the impedance of the two orthogonally polarized.

The core conductors of the probes 5 and 7 are connected to the circuit patterns 48 and 49 formed on the circuit board 4 by soldering or the like, respectively. The circuit board 4 and the shield cover 46 are fixed to the chassis body 45 by screwing fixing screws 47 into the mounting holes 53 of the chassis body 45 through the fixing holes 51 and 52. A circuit forming a converter is formed on the surface of the circuit board 4 facing the chassis body 45.

A cover 55 is attached to the entire surface of the chassis body 45 via a waterproof packing 54. The output terminal 44 is fixed to the back surface of the chassis body 45. When the chassis body 45 is inserted into the waterproof cover 41, the fixing nut 43 is fitted to the output terminal 44 protruding to the back surface via the waterproof packing 42. The chassis body 45 is fixed.

The vertically polarized waves and the horizontally polarized waves input into the circular waveguide 1a are reflected by the shorting rod 6 and the shorting wall 8 and received by the probes 5 and 7, respectively, to form a converter on the circuit board 4. Sent to the circuit. The signal amplified on the circuit board 4 and converted to the intermediate frequency is sent to the output terminal 44 fixed to the chassis body 45 and output.

FIG. 7 is a block diagram showing a circuit configuration of a converter for receiving satellite broadcasting / satellite communication formed on the circuit board 4. Referring to FIG. 7, this converter 61
Is an LNA that amplifies the signals from probes 5 and 7.
(Low-noise amplifier) 62, filter 63 for receiving the output of LNA 62, local oscillator 68, mixer 64 for synthesizing the output of filter 63 and the output signal of local oscillator 68 and converting to an intermediate frequency, and mixer It includes an intermediate frequency amplifier 65 for amplifying the output signal of 64 and outputting it through the output terminal 44, and a power supply 67 for supplying power to each of these circuits.

The LNA 62 includes an amplifier 71 for amplifying the output signal of the probe 5, an amplifier 72 for amplifying the output signal of the probe 7, and a switch for switching the outputs of the amplifiers 71 and 72 by controlling the operating voltage of the converter. 74
And an amplifier 73 that amplifies the output of the switch 74 and supplies it to the filter 63.

The polarized wave input to the waveguide 1a is given to the LNA 62 through the probes 5 and 7, and one of them is selected by the switch 74 and given to the filter 63. The output signal of the filter 63 is combined with the output signal of the local oscillator 68 by the mixer 64 and converted into an intermediate frequency signal. The intermediate frequency signal is further amplified by the intermediate frequency amplifier 65 and output via the output terminal 44.

As described above, according to the present embodiment, the probe 7 can be configured so as to match the impedance of the two orthogonal polarized waves as compared with the conventional probe 90. Therefore, there is an effect that the circuit design for improving the cross polarization characteristic and the input return loss, including the routing of the circuit pattern for synthesizing the polarized waves that are high frequency signals, becomes simpler. Further, the circuit board and the circuit scale can be made smaller, and the circuit material cost can be reduced, as compared with the case where the circuit is designed so that the cross polarization characteristic and the input return loss are reduced in the conventional configuration.

When this orthogonal dual-polarization waveguide input device is used in a satellite broadcast receiving converter, the design becomes easy while improving the reception characteristics of the orthogonal dual-polarization waveguide input device. In addition, the parts cost of the converter for satellite broadcasting reception is kept low,
Moreover, since the assembly thereof is easy, the manufacturing cost of the converter itself can be reduced.

The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

[Brief description of drawings]

FIG. 1 is a perspective view of a second probe of an orthogonal dual polarization waveguide input device according to a first embodiment of the present invention.

FIG. 2 is a trihedral view showing the overall configuration of the orthogonal dual polarization waveguide input device according to the first embodiment of the present invention.

FIG. 3 is an enlarged plan view of the vicinity of the insertion hole of the second probe of the orthogonal dual polarization waveguide input device according to the first embodiment.

FIG. 4 is a band data diagram of a conventional orthogonal dual polarization waveguide input device.

FIG. 5 is a band data diagram of the orthogonal dual-polarization waveguide input device according to the first embodiment.

FIG. 6 is an exploded perspective view of the orthogonal dual-polarization waveguide input device according to the first embodiment.

FIG. 7 is a schematic block diagram of a satellite broadcast converter using the orthogonal dual-polarization waveguide input device according to the first embodiment.

FIG. 8 is a trihedral view showing the overall configuration of an example of a conventional orthogonal two-polarization waveguide input device.

FIG. 9 is a perspective view of a second probe used in an example of a conventional orthogonal two-polarization waveguide input device.

[Explanation of symbols]

1, 90 Orthogonal 2-polarization waveguide input device 2 First polarization plane 3 Second polarization plane 4 Circuit board 5 First probe 7 Second probe 9 Core conductor 9a Tip of core conductor 10 Dielectric 11 Metal thin film 61 Satellite broadcasting converter

Claims (3)

(57) [Claims] 1. To introduce and propagate two orthogonal polarizations including a first polarization having a first plane of polarization and a second polarization having a second plane of polarization that are orthogonal to each other, A waveguide whose one end is open and the other end is closed by a short-circuit wall, and a tip portion is provided so as to project from the inner peripheral wall of the waveguide in parallel with the first plane of polarization, A first probe for receiving, and a second probe for receiving the second polarized wave, the tip of which is provided so as to project from the inner peripheral wall of the waveguide in parallel with the second polarization plane. And an outer peripheral wall of the waveguide provided parallel to the second plane of polarization, connected to the first probe and the second probe, and the first probe received by the first probe. A circuit board for receiving and synthesizing a polarized wave signal and the second polarized wave signal received by the second probe; Wherein the waveguide is for inserting the second probe,
The second probe has an opening formed in parallel with the first plane of polarization for the second probe, and the second probe has a core formed in a shape in which a tip portion projects substantially at right angles to an axial direction. A conductor; a dielectric layer formed so as to cover the periphery of the core conductor so that the tip of the core conductor is exposed; and the second probe having the opening for the second probe. And a conductive layer formed so as to cover the entire range of the dielectric layer exposed in the cavity generated when inserted into the orthogonal two-polarization waveguide input device. 2. The orthogonal dual-polarization waveguide input device according to claim 1, wherein the conductive layer includes a thin film metal layer. 3. An orthogonal dual polarization waveguide input device according to claim 1, and a conversion circuit for obtaining an intermediate frequency signal from the output of the orthogonal dual polarization waveguide input device. , A converter for satellite reception.