JP2004072318A - Converter for receiving satellite broadcasting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a satellite broadcasting receiving converter which is suitably miniaturized and low-cost. <P>SOLUTION: A circuit board 2 is arranged in a waveguide 1 having a slope 1a in its inside so that the circuit board 2 is in parallel with the pipe axis of the waveguide 1, a first probe 12 and a first short circuit terminal 10 are inserted into the waveguide 1. A notch hole 2a is formed on the circuit board 2, a second probe 6 is patterned on a projected piece 2f extended to the center of the notch hole 2a and matching patterns 4a, 8a extended to a direction orthogonal to the projected direction of the second probe 6 are formed on the outside of the notch hole 2a. A second short circuit terminal 11 is formed on the inner bottom of a cover 3 having a bottomed shape and the cover 3 is fixed on the waveguide 1 through the notch hole 2a of the circuit board 2 to face the matching patterns 4a, 8a to the waveguide 1 and the inside of the cover 3. Consequently the electric power feeding efficiency of the second probe 6 can be improved without forming an impedance conversion part of a complicated shape in the waveguide 1. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a satellite broadcast receiving converter for receiving two types of linearly polarized signals orthogonal to each other, and more particularly, to a satellite broadcast receiving converter in which a probe for detecting one of the linearly polarized waves is patterned on a circuit board. Related to converters.
[0002]
[Prior art]
FIG. 9 is a cross-sectional view showing a conventional example of this type of satellite broadcast receiving converter. As shown in the figure, this satellite broadcast receiving converter is a waveguide made of a highly conductive metal material such as aluminum die-cast. It includes a tube 100, a circuit board 101 on which a converter circuit and the like are formed, a bottomed lid 102 and the like.
[0003]
A horn (not shown) is integrally formed on one end of the waveguide 100, and the other end is opened downward to form an opening 100a. In addition, an inclined surface 100b facing the opening 100a is formed inside the waveguide 100, and the inclined surface 100b intersects the tube axis of the waveguide 100 at an angle of approximately 45 degrees. . Further, an impedance conversion section 100c is formed inside the waveguide 100, and the impedance conversion section 100c is formed in a step-like manner so that the opening area gradually decreases toward the inclined surface 100b. The circuit board 101 is superimposed on the outer wall surface of the waveguide 100. The circuit board 101 has a notch 101a facing the opening 100a of the waveguide 100 and faces the center of the notch 101a. A protruding piece 101b is formed. The cover 102 covers the cutout hole 101 a and the protrusion 101 b of the circuit board 101, and is fixed to the waveguide 100 using a plurality of screws 103.
[0004]
In addition, a first probe 104 made of a pin member and a first short-circuit terminal 105 are inserted into the waveguide 100, and the first probe 104 is connected to the converter circuit formed on the circuit board 101. Soldered to the input section. The first short-circuit terminal 105 reflects a first linearly polarized wave (for example, vertically polarized wave) traveling in the waveguide 100 and causes the first probe 104 to detect the first linearly-polarized wave. It is set at a position about 1/4 wavelength away from the first probe 104 in the traveling direction of the radio wave. On the other hand, a second probe 106 is formed in a pattern on the protruding piece 101b of the circuit board, and the second probe 106 is connected to an input portion of the converter circuit. The inner bottom surface of the lid 102 serves as a second short-circuit terminal 107 that reflects a second linearly polarized wave (for example, a horizontally polarized wave) traveling in the waveguide 100 and causes the second probe 106 to detect the second linearly polarized wave. The second short-circuit terminal 107 is set at a position separated from the second probe 106 by about 約 wavelength in the traveling direction of the radio wave.
[0005]
In the satellite broadcast receiving converter configured as described above, the radio wave transmitted from the satellite enters the waveguide 100 as the first linearly polarized wave and the second linearly polarized wave that enter from the horn section and are orthogonal to each other. As it proceeds, the first linearly polarized wave is reflected by the first short-circuit terminal 105 and detected by the first probe 104. The second linearly polarized wave passes through the impedance conversion unit 10c, is changed in direction on the inclined surface 10b, is reflected by the second short-circuit terminal 107 of the lid 12, and is detected by the second probe 106. . The orthogonally polarized signals detected by the first and second probes 104 and 106 are frequency-converted into IF frequency signals by the converter circuit formed on the circuit board 101, and then output from an output terminal (not shown). Is output via the.
[0006]
[Problems to be solved by the invention]
In the above-mentioned conventional converter for receiving satellite broadcasting, the stepped impedance converter 100c that allows only the second linearly polarized wave to pass is formed inside the waveguide 100. Even if the electric field is slightly disturbed by the influence of the first short-circuit terminal 105 or the inclined surface 100b, the matching with the second probe 106 can be achieved, and the power supply efficiency of the second probe 106 can be increased by the impedance converter 100c. it can. However, since such an impedance conversion unit 100c must be formed inside the waveguide 100, there is a problem that the waveguide 100 is elongated in the tube axis direction and it is difficult to reduce the size. However, there is a problem that the overall shape is complicated and the manufacturing cost is increased.
[0007]
The present invention has been made in view of such a situation of the related art, and an object of the present invention is to provide a satellite broadcast receiving converter suitable for miniaturization and cost reduction.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a converter for receiving satellite broadcasting according to the present invention provides a waveguide in which radio waves entering a tube travel as first linear polarization and second linear polarization orthogonal to each other, and A first probe disposed so as to protrude into the waveguide, a first short-circuit terminal that reflects the first linearly polarized wave and causes the first probe to detect the first linearly polarized wave, A circuit board disposed at the rear opening end, a second probe formed in a pattern on the circuit board and projecting into the waveguide tube, and reflecting the second linearly polarized wave to form the second probe. A second short-circuit terminal to be detected by a probe, and a ground conductor extending in a direction substantially perpendicular to a projecting direction of the second probe is pattern-formed on the circuit board, and the ground conductor is formed in the waveguide of the waveguide. It was made to come out.
[0009]
In the satellite broadcast receiving converter configured as described above, the grounding conductor projecting into the waveguide tube becomes a capacitance component, and the grounding conductor is patterned and adjusted as a matching pattern to improve the power supply efficiency of the second probe. Since the height can be increased, it is not necessary to provide a complicated impedance conversion section inside the waveguide, and accordingly, the waveguide can be simplified and shortened in the tube axis direction.
[0010]
In the above configuration, the ground conductor may be patterned on at least one surface of the circuit board, but the ground conductor may be patterned on both front and back surfaces of the circuit board, and these ground conductors may be connected to each other via through holes. Is preferred.
[0011]
Further, in the above configuration, it is possible to dispose the circuit board so as to be orthogonal to the tube axis of the waveguide. It is preferable to provide an inclined surface for guiding the second linearly polarized wave to the second short-circuit terminal inside the wave tube. In this case, a second short-circuit terminal is provided on the inner bottom surface of the lid, and the lid is disposed to face the rear opening end of the waveguide via the circuit board, and the lid is guided by the first short-circuit terminal. When fixed to the corrugated tube, the first short-circuit terminal can also be used as fixing means for the lid. At this time, the first short-circuit terminal is integrally formed on the lid, and the first short-circuit terminal is penetrated through the circuit board and the waveguide tube and soldered to the outer wall surface of the waveguide. Can be simplified.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a plan view of a converter for receiving satellite broadcasting according to a first embodiment, and FIG. 2 is a cross-sectional view taken along line II-II of FIG. , FIG. 3 is a perspective view of a waveguide provided in the satellite broadcast receiving converter, FIG. 4 is a perspective view of the waveguide viewed from the side opposite to FIG. 3, and FIG. 5 is provided in the satellite broadcast receiving converter. FIG. 6 is a rear view of the circuit board, and FIG. 7 is a perspective view of a lid provided in the satellite broadcast receiving converter.
[0013]
The converter for receiving satellite broadcasting according to the present embodiment includes a rectangular tubular waveguide 1 having an inclined surface 1a on one end side, a circuit board 2 on which a converter circuit and the like are formed, and a bottomed lid 3. Etc. are provided.
[0014]
The waveguide 1 is formed by bending a metal plate. The end face of the waveguide 1 opposite to the inclined surface 1a is a square front opening end 1b. A dielectric feeder (not shown) is attached to the front open end 1b. Radio waves transmitted from a satellite are guided into the waveguide 1 from the dielectric feeder, and then the electric waves are orthogonal to each other. It travels toward the inclined surface 1a as the first linearly polarized wave and the second linearly polarized wave. If a 90-degree phase shift unit is provided in the dielectric feeder, a circularly polarized wave transmitted from a satellite can be converted into a linearly polarized wave and guided into the waveguide 1. As shown in FIGS. 3 and 4, a rectangular opening 1c is formed on one side surface of the waveguide 1, and a hole 1d is formed on the other side surface of the waveguide 1 facing the opening 1c. ing. A plurality of leg pieces 1e, a plurality of bent pieces 1f, and one locking piece 1g are formed on the periphery of the opening 1c, and each bent piece 1f is bent outward from the opening 1c. However, the locking piece 1g is bent inward toward the opening 1c. The inclined surface 1a intersects the tube axis of the waveguide 1 at an angle of approximately 45 degrees, and a radio wave entering from the front opening end 1b side of the waveguide 1 is folded at a right angle by the inclined surface 1a. It proceeds in the direction of the opening 1c.
[0015]
As shown in FIGS. 5 and 6, the circuit board 2 is formed with a rectangular cutout hole 2a, a plurality of locking holes 2b, a positioning hole 2c, and one through hole 2d and a through hole 2e. A projecting piece 2f extending toward the center is formed on the long side of the hole 2a. An inner ground conductor 4 and an outer ground conductor 5 are formed on the surface of the circuit board 2 in a pattern, and a portion of the inner ground conductor 4 extending along the long sides of the cutout holes 2a facing each other is a matching portion to be described later. It functions as the pattern 4a. On the other hand, a circuit element of a converter circuit (not shown) is mounted on the back surface of the circuit board 2, and a second probe 6 connected to an input portion of the converter circuit is formed on the protruding piece 2f in a pattern. An outer ground conductor 7 is pattern-formed on the back surface of the circuit board 2 along the outer peripheral edge, and an inner ground conductor 8 is pattern-formed so as to surround the cutout hole 2a. A portion of the inner grounding conductor 8 extending along the long sides of the notch holes 2a facing each other functions as a matching pattern 8a to be described later, and the matching patterns 4a, 8a on the front and back surfaces of the circuit board 2 are numerous. It is conductive through the through hole 9.
[0016]
As shown in FIG. 7, the lid 3 is formed by bending a metal plate into a rectangular cylindrical shape, and a plurality of positioning projections 3a are integrally formed on opposing side surfaces of the lid 3. Further, a first short-circuit terminal 10 projecting in a belt shape is integrally formed on one side surface of the lid 3, and an inner bottom surface of the lid 3 is a second short-circuit terminal 11.
[0017]
As shown in FIGS. 1 and 2, each locking piece 1g of the waveguide 1 is locked to one side surface of the circuit board 2 and each leg 1e is inserted into the corresponding locking hole 2b. By soldering the bent piece 1f to the outer ground conductor 5, the waveguide 1 is placed and fixed on the circuit board 2 so that the opening 1c overlaps the inner ground conductor 4. As a result, the opening 1c of the waveguide 1 is covered with the circuit board 2 except for the notch 2a, and the opening 1c overlapping the notch 2a forms the rear opening end of the waveguide 1. A first probe 12 made of a pin member is inserted into the waveguide 1 from the back side of the circuit board 2 through the through-hole 2e, and the first probe 12 is formed on the circuit board 2. It is soldered to the input of the converter circuit.
[0018]
In addition, each positioning protrusion 3a of the lid 3 is inserted into the corresponding positioning hole 2c of the circuit board 2, and the first short-circuit terminal 10 is inserted from the through hole 2d into the hole 1d to form an outer surface of the waveguide 1. The cover 3 is fixed to the back surface of the circuit board 2 by soldering. As a result, the rear opening end of the waveguide 1 and the cutout hole 2 a of the circuit board 2 are covered with the cover 3, and the first short-circuit terminal 10 is moved inside the waveguide 1 from the first probe 12 in the traveling direction of the radio wave. The second short-circuit terminal 11 is arranged at a position about 1/4 wavelength apart from the second probe 6 in the traveling direction of the radio wave. The first short-circuit terminal 10 reflects a first linearly polarized wave (for example, a vertically-polarized wave) traveling in the waveguide 1 and causes the first probe 12 to detect the first linearly-polarized wave. The second linearly polarized wave (for example, a horizontally polarized wave) is reflected and detected by the second probe 6. Further, a frame 13 made of a metal material is fixed to the back side of the circuit board 2, and the frame 13 is soldered to the outer ground conductor 7 on the back side of the circuit board 2. By covering the opening of the frame 13 with the cover 14, the converter circuit formed on the back surface of the circuit board 2 is electrically shielded.
[0019]
In the thus configured converter for receiving satellite broadcasting, a radio wave transmitted from a satellite enters the inside of the waveguide 1 from a dielectric feeder (not shown) attached to the front opening end 1b, and the radio waves are mutually transmitted. When traveling in the waveguide 1 as orthogonal first and second linear polarizations, the first linear polarization is reflected by the first short-circuit terminal 10 and detected by the first probe 12. You. The direction of the second linearly polarized wave is changed by the inclined surface 1 a of the waveguide 1, and then reflected by the second short-circuit terminal 11 of the lid 3 and detected by the second probe 6 on the circuit board 2. Is done. Here, matching patterns 4a, 8a are formed on both front and back surfaces of the circuit board 2 outside of the cutout hole 2a that projects into the waveguide 1 and the lid 3, and these matching patterns 4a, 8a Since the second probe 6 extends in the direction orthogonal to the direction in which the second probe 6 projects, the reactance component of the second probe 6 and the capacitance component of the matching patterns 4a and 8a are formed inside the waveguide 1 and the lid 3. Therefore, by appropriately setting the pattern shape including the width and length of the matching patterns 4a and 8a, even if the second linearly polarized electric field is slightly disturbed by the influence of the first short-circuit terminal 10 and the inclined surface 1a, The matching with the second probe 6 can be achieved, and the power supply efficiency of the second probe 6 can be increased. The orthogonal two-polarized signals detected by the first and second probes 12 and 6 are frequency-converted into IF frequency signals by the converter circuit formed on the circuit board 2 and then output from an output terminal (not shown). Is output via the.
[0020]
In the converter for receiving satellite broadcasting according to the first embodiment described above, matching patterns 4a and 8a extending in a direction orthogonal to the direction in which the second probe 6 protrudes are formed outside the cutout holes 2a of the circuit board 2. Since the matching patterns 4a and 8a are exposed inside the waveguide 1 and the lid 3, the power supply efficiency of the second probe 6 can be reduced without providing a complicated impedance converter inside the waveguide 1. Can be enhanced. Therefore, the waveguide 1 having a simple shape obtained by bending a metal plate can be used, and accordingly, the manufacturing cost of the waveguide 1 can be reduced, and the dimensions of the waveguide 1 can be reduced in the tube axis direction. The length can be shortened and the size can be reduced. Further, since the matching patterns 4a and 8a are formed on both the front and back surfaces of the circuit board 2 and both are conducted through the through holes 9, the degree of freedom of the pattern shapes of the matching patterns 4a and 8a is increased, and the second linearly polarized wave is formed. And the second probe 6 can be easily matched. Further, the first short-circuit terminal 10 is integrally formed on the lid 3, and the first short-circuit terminal 10 is passed through the circuit board 2 and the waveguide 1 and soldered to the outer wall surface of the waveguide 1. Therefore, the first short-circuit terminal 10 can be used also as a fixing means of the lid 3, and the assembling work can be simplified.
[0021]
FIG. 8 is a cross-sectional view of a main part of a converter for receiving satellite broadcasting according to the second embodiment, and portions corresponding to FIG.
[0022]
The difference between the satellite broadcast receiving converter according to the present embodiment and the first embodiment described above is that both the waveguide 20 and the lid 21 are formed of a metal material such as aluminum die-cast, Is formed as a separate member from the lid 21, and other configurations are basically the same. That is, the waveguide 20 has a front opening end 20a on one end side, a rear opening end 20b on the other end side, and an inclined surface 20c facing the rear opening end 20b inside. I have. The circuit board 2 is configured in the same manner as in the first embodiment. The lid 21 covers the rear opening end 20b of the waveguide 1 and the cutout hole 2a of the circuit board 2, and the first short-circuit terminal 22 and the screw 23 is used to fix to the waveguide 20.
[0023]
In the satellite broadcast receiving converter according to the second embodiment configured as described above, the matching patterns 4a, 4b extending in the direction orthogonal to the projecting direction of the second probe 6 outside the cutout hole 2a of the circuit board 2 are also provided. 8a, and these matching patterns 4a, 8a are exposed inside the waveguide 20 and the lid 21, so that the second probe 6 can be provided without providing a complicated impedance converter inside the waveguide 20. The power supply efficiency can be increased, the waveguide 20 can be made simpler to reduce its manufacturing cost, and the size of the waveguide 20 can be shortened in the tube axis direction to reduce the size. it can.
[0024]
In the first and second embodiments, the waveguides 1 and 20 having the inclined surfaces 1a and 20c are used. 2 has been described in parallel with a satellite broadcast receiving converter, but a straight waveguide having no inclined surface inside is used, and a circuit board is orthogonally arranged with respect to the tube axis of such a waveguide. It is also applicable to the above-mentioned satellite broadcast receiving converter.
[0025]
In the first and second embodiments described above, the case where the matching patterns 4a, 8a are formed on both the front and back surfaces of the circuit board 2 has been described. However, even if one of the matching patterns 4a, 8a is omitted. good.
[0026]
【The invention's effect】
The present invention is implemented in the form described above, and has the following effects.
[0027]
A waveguide in which radio waves entering the tube travel as a first linear polarization and a second linear polarization orthogonal to each other, a first probe disposed so as to protrude into the waveguide of the waveguide; A first short-circuit terminal for reflecting the first linearly polarized wave and detecting it by the first probe, a circuit board disposed at the rear opening end of the waveguide, and a pattern formed on the circuit board for conducting. A second probe protruding into the tube of the wave tube, and a second short-circuit terminal for reflecting the second linearly polarized wave to be detected by the second probe. A ground conductor extending in a direction substantially perpendicular to the conductor is formed in a pattern, and this ground conductor is made to project into the waveguide tube.The ground conductor that comes into the waveguide tube becomes a capacitance component, and this ground conductor is matched. By adjusting the pattern as a pattern, It is possible to increase the feed efficiency of, therefore, eliminates the need for the interior of the waveguide is provided an impedance transformation unit of complex shape, it is possible to shorten the tube axis direction together with possible waveguide simple shape.
[Brief description of the drawings]
FIG. 1 is a plan view of a satellite broadcast receiving converter according to a first embodiment of the present invention.
FIG. 2 is a sectional view taken along the line II-II in FIG.
FIG. 3 is a perspective view of a waveguide provided in the satellite broadcast receiving converter.
FIG. 4 is a perspective view of the waveguide viewed from a side opposite to FIG. 3;
FIG. 5 is a plan view of a circuit board provided in the satellite broadcast receiving converter.
FIG. 6 is a rear view of the circuit board.
FIG. 7 is a perspective view of a lid provided in the satellite broadcast receiving converter.
FIG. 8 is a sectional view of a main part of a converter for receiving satellite broadcasting according to a second embodiment of the present invention.
FIG. 9 is a sectional view of a satellite broadcast receiving converter according to a conventional example.
[Explanation of symbols]
Reference Signs List 1 waveguide 1a inclined surface 1b front opening end 1c opening 1d hole 1e leg piece 1f bent piece 1g locking piece 2 circuit board 2a cutout hole 2b locking hole 2c positioning hole 2d through hole 2e through hole 2f protrusion 3 Lid 3a Positioning protrusion 4 Inner ground conductor 4a Matching pattern 5 Outer ground conductor 6 Second probe 7 Outer ground conductor 8 Inner ground conductor 8a Matching pattern 9 Through hole 10 First short-circuit terminal 11 Second short-circuit terminal 12 First Probe 20 Waveguide 20a Front open end 20b Rear open end 20c Inclined surface 21 Lid 22 First short-circuit terminal

Claims (5)

A waveguide in which radio waves entering the tube travel as a first linear polarization and a second linear polarization orthogonal to each other, a first probe disposed so as to protrude into the waveguide of the waveguide; A first short-circuit terminal for reflecting the first linearly polarized wave to be detected by the first probe, a circuit board disposed at a rear opening end of the waveguide, and forming a pattern on the circuit board. A second probe that is projected into the waveguide of the waveguide, and a second short-circuit terminal that reflects the second linearly polarized wave and causes the second probe to detect the second linearly polarized wave;
A grounding conductor extending in a direction substantially perpendicular to a projecting direction of the second probe is formed on the circuit board in a pattern, and the grounding conductor is exposed inside the waveguide tube; converter. 2. The satellite broadcast receiving converter according to claim 1, wherein said ground conductor is patterned on both front and back surfaces of said circuit board, and said ground conductors are connected to each other via through holes. 3. The inclined surface according to claim 1, wherein the circuit board is disposed parallel to a tube axis of the waveguide, and the second linearly polarized wave is guided to the second short-circuit terminal by the waveguide. 4. A converter for receiving satellite broadcasting, comprising: 4. The device according to claim 3, wherein the second short-circuit terminal is provided on an inner bottom surface of the lid, and the lid is disposed to face a rear opening end of the waveguide via the circuit board, and the first short-circuit terminal is provided on the first side. A converter for receiving satellite broadcasting, wherein the converter is fixed to the waveguide by a short-circuit terminal. 5. The waveguide according to claim 4, wherein the first short-circuit terminal is formed integrally with the lid, and the first short-circuit terminal penetrates through the circuit board and the waveguide. A converter for receiving satellite broadcasts, which is soldered to.

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