JP3519630B2 - Coaxial waveguide converter and satellite broadcast receiving converter including the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency coaxial waveguide converter, and more particularly to a coaxial waveguide converter for a satellite broadcast receiving converter.

[0002]

2. Description of the Related Art Satellite broadcasting is a communication mode in which a ground receiver directly receives radio waves sent from a space station, and a satellite broadcasting receiver has a receiving antenna for receiving weak 12 GHz band radio waves. A converter provided with a coaxial waveguide converter for converting a received wave into an intermediate frequency of 1 GHz band, and a tuner are applicable, and a target station is selected by the tuner and introduced into a receiver. FIG. 9 is a vertical cross-sectional view of a satellite broadcast receiving converter 100 using a conventional coaxial waveguide converter, and FIG. 10 shows (a) the satellite broadcast receiving converter 100 of FIG. It is an expanded longitudinal cross-sectional view of the coaxial waveguide converter 110, (b) is a sectional view of the coaxial waveguide converter 110 of FIG.

The satellite broadcast receiving converter 100 includes:
Coaxial waveguide converter 110 and the coaxial waveguide converter 110
Primary radiator 124 that radiates a linearly polarized wave toward, a waterproof cover 123 that covers the primary radiator 124, a chassis main body 121 and a back cover 122 that accommodate the coaxial waveguide converter 110 and the like, and an output terminal. The chassis body 121 has a rectangular cross-section with an open bottom, and the upper surface of the chassis body 121 is integrated with a circular waveguide 120 extending upward from the upper surface. The inside of the chassis body 121 has a space for accommodating the circuit board 140 and the frame 131 integrated with the rectangular waveguide 130, and the inner surface of the chassis body 121 is
By contacting the upper surface 140U of the circuit board 140, a plurality of circuits provided on the upper surface 140U are covered. The lower side of the chassis body 121 is shielded and waterproof by a back cover 122, and an output terminal 150 is provided on the side surface of the chassis body 121. The frame 131 is in contact with the lower surface 140L of the circuit board 140 and constitutes the rectangular waveguide 130.

The coaxial waveguide converter 110 includes a circular waveguide 1
20, the rectangular waveguide 130, and the circuit board 140, and the longitudinal axis of the circular waveguide 120 and the longitudinal axis of the rectangular waveguide 130 are orthogonal to each other, and the circuit board. The upper surface 140U of the 140 is sandwiched by the circular waveguide 120, and the lower surface 140L thereof is sandwiched by the rectangular waveguide 130. The rectangular waveguide 130 is used for the circuit board 14
It is a tube having a rectangular cross section in which the upper surface of the rectangular waveguide 130 is formed by the ground surface 144 provided on the lower surface 140L of the rectangular waveguide 130.

The coaxial waveguide converter 110 further includes a first short-circuit surface 132 for reflecting the horizontally polarized wave L1 introduced from the circular waveguide 120 toward the first probe 142 and a circular waveguide. A matching reflection rib 133 that reflects only the vertically polarized wave L2 introduced from 120 by bending it to the second probe 143 side in the rectangular waveguide 130 by 90 ° and a vertical polarization reflected by the matching reflection rib 133. A second short-circuit surface 134 for reflecting the wave L2 to the second probe 143 side again, and the matching reflection rib 133 is provided in the circular waveguide 120.
Forming a triangular rib having a rectangular cross section, which is provided at a connecting portion between the rectangular waveguide 130 and the rectangular waveguide 130.

Microstrip lines 141a and 141b are provided on an upper surface 140U of the circuit board 140, and a first probe 142 is provided at an end of the microstrip line 141a and an axial line of the rectangular waveguide 130 in the longitudinal direction. And a direction that is orthogonal to the circular waveguide 20 and projects toward the center of the circular cross section of the circular waveguide 20. First probe 14
Reference numeral 2 is for detecting the horizontal polarization L1, and includes the horizontal polarization L1 introduced from the circular waveguide 120 and the first short-circuit plane 1.
The horizontal polarization L1 reflected by 32 is detected. The first probe 142 and the first short-circuit surface 132 are installed with a distance of 1/4 wavelength.

A second probe 143 is connected to the end of the microstrip line 141b, and the circuit board 14
It projects from 0 toward the lower surface 140L of the circuit board 140. The second probe 143 detects the vertical polarization L2, is introduced from the circular waveguide 120, and is reflected by the matching reflection rib 133 and reflected by the second short-circuit surface 134. The vertical polarization L2 is detected. The second probe 143 and the second short-circuit surface 134
Are installed at intervals of 1/4 wavelength.

Input signals in the 12 GHz band, which are linear polarizations of the horizontal polarization L1 and the vertical polarization L2 from the receiving antenna (not shown), are orthogonal to each other and are horizontally polarized parallel to the protruding direction of the first probe 142. Wave L1 is the first probe 142
The horizontal polarized wave L1 reflected by the first short-circuit surface 132 and the horizontal polarized wave L1 not reflected by the first short-circuit surface 132 are matched and detected, and are transmitted to the microstrip line 141a. The matching reflection rib 133
Indicates that the horizontal polarization L1 is hardly affected.

Further, the vertical polarization L2 perpendicular to the protruding direction of the first probe 142 is hardly affected by the first probe 142, and the matching reflection rib 133 reduces the mismatch and the passage loss. Rectangular waveguide 130
Is transmitted within. The vertically polarized wave L2 is generated by the second probe 14
3 is detected directly, and the vertical polarization L2 reflected by the second short-circuit surface 134 and the vertical polarization L2 not reflected are matched and detected, and are transmitted to the microstrip line 141b.

Then, the microstrip line 141
a and 141b are a low noise amplifier circuit (not shown), a filter circuit (not shown), a local oscillator circuit (not shown), and a mixer circuit provided between the inside of the chassis body 121 and the upper surface 140U of the circuit board 140. (Not shown), connected to each circuit of an intermediate frequency amplifier circuit (not shown), amplified with low noise, frequency-converted into an intermediate frequency signal of 1 GHz band, and output from an output terminal 150 to a tuner (not shown). There is.

The local oscillator circuit provided on the upper surface 140U of the circuit board 140 is provided with a frequency adjusting screw 170 and a dielectric resonator 180, and the frequency adjusting screw 170 is inserted from the outer side to the inner side of the chassis body 121. And the dielectric resonator 180 is attached to the upper surface 1 of the circuit board 140.
It is provided at 40 U, and finely adjusts the local frequency by changing the distance h between the frequency adjusting screw 170 and the dielectric resonator 180. A liquid sealing material 190 is filled around the frequency adjusting screw 170 to ensure waterproofing in the gap with the chassis body 121.

[0012]

As described above, as shown in FIG.
The conventional coaxial waveguide converter 110 shown in FIG. 10 and the satellite broadcast receiving converter 100 equipped with the coaxial waveguide converter 110 include microstrip lines 141a and 141b on a top surface 140U of a circuit board 140, and a low noise amplifier circuit connected thereto. , A filter circuit, a local oscillator circuit, a mixer circuit, and an intermediate frequency amplifier circuit are formed, and a space for accommodating the circuits is required on the upper surface 140U of the circuit board 140. The height of 130 and each of the circuit portions is required, which causes a problem in downsizing the satellite broadcast receiving converter 100.

Further, since the frequency adjusting screw 170 for adjusting the local frequency is provided in the chassis body 121, it is necessary to fill the liquid sealing material 190 for waterproofing, and the liquid sealing material 190 is hardened. Since it takes time until the satellite broadcast receiving converter 100, there arises a problem that the work efficiency of the frequency adjustment of the satellite broadcast receiving converter 100 is deteriorated. Moreover, since the liquid sealing material 190 does not have a shielding effect, there is a disadvantage that a local signal leaks to the outside of the chassis body 121 and the performance of the satellite broadcast receiving converter 100 is deteriorated. Further, in the coaxial waveguide converter 110, the coupling position with the output end of the second probe 143, the microstrip line 141b, and each circuit portion such as the low noise amplifier circuit is determined, and the degree of freedom of the circuit pattern is increased. Is limited.

Here, Japanese Unexamined Patent Publication (Kokai) No. 8-162804 describes an orthogonal demultiplexer capable of synthesizing electromagnetic waves of mutually orthogonal polarized waves in the same plane of polarization and shortening the total length. However, no consideration has been given to the miniaturization by the circuit board and the waveguide.
Japanese Patent No. 6618 discloses a probe mounting structure in which the shape of the probe and the relative position of each component are improved in order to reduce the circuit board required for each probe. No particular consideration is given to downsizing of the entire broadcast receiving converter.

The present invention has been made in view of the above problems, and an object of the present invention is to miniaturize a satellite broadcast receiving converter and to improve work efficiency and performance of frequency adjustment. It is an object of the present invention to provide a coaxial waveguide converter and a satellite broadcast receiving converter including the same.

[0016]

[Means for Solving the Problems] To achieve the above object,
A coaxial waveguide converter according to the present invention includes a circular waveguide, a rectangular waveguide, and a circuit board, and the longitudinal axis of the circular waveguide and the longitudinal direction of the rectangular waveguide. And the lower surface of the circuit board is in contact with the rectangular waveguide, and the circuit board has a first linear polarization on its lower surface. A first probe for detecting a wave and a second probe for detecting a second linearly polarized wave penetrating the upper and lower surfaces thereof are provided, and the detected first linear polarization is provided on the lower surface of the circuit board. A microstrip line for transmitting a wave and the second linearly polarized wave is formed.

The second probe is characterized in that it has one end for detecting the second linearly polarized wave and another end for connecting to the microstrip line. In a preferred specific embodiment of the coaxial waveguide converter coaxial waveguide of the present invention, the second probe is a substantially U-shaped coaxial line, or a substantially U-shaped metal rod. It is characterized in that a cavity is formed around the second probe on the upper surface side of the circuit board, and further, the cavity is filled with a dielectric.

Further, the circuit board has another microstrip line formed on the upper surface thereof, and the microstrip line and the microstrip line formed on the lower surface of the circuit board are metal rods or cylinders in through holes. It is characterized in that it has one end connected to the second body and the other end connected to the second probe. Further, the other microstrip line formed on the upper surface of the circuit board is curved.

Further, a converter for receiving a satellite broadcast including a coaxial waveguide converter coaxial waveguide of the present invention includes the rectangular waveguide, and the rectangular waveguide is provided on the lower surface of the circuit board.
It is characterized in that it comprises a frame which is in contact with the lower surface of the circuit board and covers a plurality of circuits, the frame having frequency adjusting screws, and the circuit board having a dielectric resonator. Since the coaxial waveguide converter according to the present invention configured as described above has the space for housing each circuit portion on the lower surface of the circuit board, the coaxial waveguide converter housed by the chassis body and the back cover. The height can be reduced, and the satellite broadcast receiving converter can be downsized.

Further, since the space for accommodating each circuit is provided on the lower surface of the circuit board, the frequency adjusting screw for local frequency adjustment can be inserted into the frame integrated with the rectangular waveguide, and the liquid is Since the sealing material becomes unnecessary and leakage of local signals due to the use of the liquid sealing material is eliminated, the efficiency and performance of the frequency adjustment work of the satellite broadcast receiving converter can be improved. Further, since the other microstrip lines provided on the upper surface of the circuit board can be freely curved, the connecting position between the microstrip line and the circuit portion can be freely changed, and the circuit pattern can be designed. The degree of freedom of can be increased.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a satellite broadcast receiving converter equipped with a coaxial waveguide converter according to the present invention will be described below with reference to the drawings. FIG. 1 is a satellite broadcast receiving converter 1 including a coaxial waveguide converter 10 of the present embodiment.
2 is a partial exploded perspective view of the coaxial waveguide converter 10 of FIG. 1, and FIG. 3 is an enlarged vertical sectional view of the coaxial waveguide converter 10. 4 (a)
(B) is an arrow A-A of the coaxial waveguide converter 10 of FIG.
It is each sectional view of arrow BB.

The satellite broadcast receiving converter 1 includes a coaxial waveguide converter 10, a primary radiator 24 that radiates a linearly polarized wave toward the coaxial waveguide converter 10, and the primary radiator 2.
4, a waterproof cover 23 for covering the coaxial waveguide converter 10 and the coaxial waveguide converter 10
A chassis main body 21 and a back cover 22 for accommodating the like, and an output terminal 50. The chassis main body 21 has a rectangular cross section with an opening on the lower side.
The upper surface of 1 is integrated with the circular waveguide 20 extending upward from the upper surface, and the inside of the chassis body 21 is provided with the circuit board 4
0 and a space for accommodating the frame 31 integrated with the rectangular waveguide 30 are provided, and the inner surface of the chassis body 21 is in contact with the upper surface 40U of the circuit board 40. The lower side of the chassis body 21 is shielded and waterproof by a back cover 22, and an output terminal 50 is provided on the side surface of the chassis body 21. The frame 31
Covers a plurality of circuits in contact with the lower surface 40L of the circuit board 40 and constitutes the rectangular waveguide 30.

The coaxial waveguide converter 10 includes a circular waveguide 20.
And a rectangular waveguide 30 and a circuit board 40,
The longitudinal axis of the circular waveguide 20 and the longitudinal axis of the rectangular waveguide 30 are orthogonal to each other, and the circuit board 40 has a rectangular upper surface 40U and a lower surface 40L. It is sandwiched by the waveguide 30. The rectangular waveguide 30 is a tube having a rectangular cross section in which the upper surface of the rectangular waveguide 30 is formed by the ground surface 44 provided on the lower surface 40L of the circuit board 40.

The coaxial waveguide converter 10 includes a first short-circuit surface 32 for reflecting the horizontally polarized wave L1 introduced from the circular waveguide 20 toward the first probe 42, and a circular waveguide. A rectangular waveguide 30 is provided only for the vertically polarized wave L2 introduced from 20.
Of the matching reflection rib 33 which is bent by 90 ° toward the second probe 43 side, and the vertically polarized wave L2 reflected by the matching reflection rib 33 is reflected again toward the second probe 43 side. The matching reflection rib 33 is provided at the connecting portion between the circular waveguide 20 and the rectangular waveguide 30 with a space from the inner wall surface of the circular waveguide 20. And forms a triangular rib having a rectangular cross section that extends from the first short-circuit surface 32 toward the first probe 42.

Microstrip lines 41a and 41b are formed on the lower surface 40L of the circuit board 40, and a first probe 42 is provided at the end of the microstrip line 41a. It projects in the direction orthogonal to the longitudinal axis of the rectangular waveguide 30 and toward the center of the circular cross section of the circular waveguide 20. The first probe 42 has a horizontal polarization L which is a first linear polarization.
1 is detected, and the horizontal polarized wave L1 introduced from the circular waveguide 20 and the horizontal polarized wave L1 reflected by the first short-circuit surface 32 are detected. The first probe 42 and the first short-circuit surface 32 are installed with a distance of ¼ wavelength.

A second probe 43, which is a substantially U-shaped coaxial line, is connected to the end of the microstrip line 41b. The second probe 43 has an antenna unit 43.
A, an intermediate portion 43B, and a line connecting portion 43C are used to detect the vertical polarization L2 that is the second linear polarization on the lower surface 40L of the circuit board 40 and is introduced from the circular waveguide 20. The vertical polarization L2 reflected by the matching reflection rib 33 and the vertical polarization L2 reflected by the second short-circuit surface 34 are detected. The second probe 43 and the second short-circuit surface 34 are installed with an interval of 1/4 wavelength. Then, the vertically polarized wave L2 detected in the antenna part 43A penetrating the circuit board 40 and projecting into the rectangular waveguide 30 passes through the intermediate part 43B extending to the upper surface 40U of the circuit board 40, and then the second short circuit. It is transmitted to the microstrip line 41b from the line connecting portion 43C that straddles the surface 34 and projects again to the lower surface 40L of the circuit board 40. In addition, the dielectric 45 and the metal film 4 are formed around the second probe 43.
6 forms a coaxial line (see FIG. 3).

Then, 12G which is a linearly polarized wave of the horizontal polarized wave L1 and the vertical polarized wave L2 from the receiving antenna (not shown)
The input signals in the Hz band are orthogonal to each other, and the first probe 4
The horizontal polarization L1 parallel to the protruding direction of 2 is directly detected by the first probe 42, and the horizontal polarization L1 reflected by the first short-circuit surface 32 and the horizontal polarization L1 not reflected are detected. It is aligned, detected, and transmitted to the microstrip line 41a. The matching reflection rib 33
Indicates that the horizontal polarization L1 is hardly affected.

Further, the vertically polarized wave L2 perpendicular to the protruding direction of the first probe 42 is transmitted through the circular waveguide 20 with little influence of the first probe 42, and is reflected by the matching reflection rib 33. The mismatch and the passage loss are reduced and the light is transmitted into the rectangular waveguide 30. The vertically polarized wave L2 is
While being directly detected by the second probe 43, the vertical polarization L2 reflected by the second short-circuit surface 34 and the vertical polarization L2 not reflected by the second short-circuit surface 34 are aligned and detected, and are transmitted to the microstrip line 41b. It

Then, the microstrip line 41
a and 41b are rectangular waveguides 3 of the frame 31
0 extending direction and the lower surface 40L of the circuit board 40, a low noise amplifier circuit (not shown), a filter circuit (not shown), a local oscillator circuit (not shown), a mixer circuit (not shown), intermediate Frequency amplifier circuit (not shown)
Connected to each of the above circuits, amplified with low noise, frequency-converted into an intermediate frequency signal in the 1 GHz band, and output from the output terminal 50 to a tuner (not shown).

The frequency adjusting screw 7 is provided in the local oscillation circuit formed on the lower surface 40L of the circuit board 40.
0 is provided from the outside to the inside of the frame 31, and the dielectric resonator 80 is provided on the lower surface 40L of the circuit board 40.
Is provided toward the inside of the frame 31, and the local frequency is finely adjusted by changing the distance h between the frequency adjusting screw 70 and the dielectric resonator 80. FIG. 5 shows a second embodiment of the coaxial waveguide converter 10,
(A) is an enlarged vertical sectional view of the coaxial waveguide converter 10,
(B) has shown sectional drawing of CC line CC of the coaxial waveguide converter 10 of (a).

Microstrip lines 41a and 41b are formed on the lower surface 40L of the circuit board 40, and a first probe 42 is provided at the end of the microstrip line 41a so that it is aligned with the axis of the rectangular waveguide 30. It projects in a direction orthogonal to the center of the circular cross section of the circular waveguide 20. The first probe 42 is the circular waveguide 20.
The horizontal polarized wave L1 introduced from the above and the horizontal polarized wave L1 reflected by the first short-circuit surface 32 are detected.

Another microstrip line 41c is formed on the upper surface 40U of the circuit board 40, and one end of the microstrip line 41c has a second probe 43.
a is connected, and the other end is connected to the metal rod 47. The second probe 43a detects the vertically polarized wave L2 on the lower surface 40L of the circuit board 40 and is introduced from the circular waveguide 20 and reflected by the matching reflection rib 33 and the second vertically polarized wave L2. Vertically polarized light L reflected by the short-circuit surface 34 of
2 is detected.

The vertically polarized wave L2 detected by the second probe 43a protruding into the rectangular waveguide 30 is a microstrip line 41 formed on the upper surface 40U of the circuit board 40.
It is transmitted to the microstrip line 41b formed on the lower surface 40L of the circuit board 40 again via the metal rod 47, passing through the second short-circuit surface 34 through c. Therefore, the U-shaped coaxial line becomes unnecessary. FIG. 6 shows a coaxial waveguide converter 1
0 shows a third embodiment of the present invention, (a) is an enlarged vertical cross-sectional view of the coaxial waveguide converter 10, (b) is a view of the coaxial waveguide converter 10 of (a) taken along the line DD. A cross-sectional view is shown.

Microstrip lines 41a and 41b are formed on the lower surface 40L of the circuit board 40, and a first probe 42 is provided at the end of the microstrip line 41a. Another microstrip line 41d is formed on the upper surface 40U of the circuit board 40.
The microstrip line 41d can be freely bent. The second probe 43a is connected to one end of the microstrip line 41d, and the other end is connected to the cylindrical body 48 in the through hole. There is.

The rectangular waveguide 3 is formed on the lower surface 40L of the circuit board 40.
The vertically polarized wave L2 detected by the second probe 43a protruding in 0 passes through the microstrip line 41d formed on the upper surface 40U of the circuit board 40 and passes through the second short-circuit surface 3
It is transmitted to the microstrip line 41b provided on the lower surface 40L of the circuit board 40 again via the tubular body 48 (sleeve or the like). Since the microstrip line 41d can be freely curved, the arrangement position of the microstrip line 41b can be freely set via the tubular body 48 in the through hole.

As described above, the above-described embodiments of the present invention have the following functions due to the above-mentioned configuration. For example, in the first embodiment, a circuit portion is provided between the lower surface 40L of the circuit board 40 and the inside of the frame 31 which is an extension of the rectangular waveguide 30, and the lower surface 40L of the circuit board 40 is provided with the circuit portion. Is provided with a first probe 42 and a second probe 43, which is a substantially U-shaped coaxial line antenna portion 43A, and the detected vertically polarized wave L2 extends to the upper surface 40U of the circuit board 40. Part 4
3B, straddling the second short-circuit surface 34, and again the circuit board 4
Since it is transmitted to the microstrip line 41b from the line connecting portion 43C projecting on the lower surface 40L of 0, the height of the circuit portion can be made equal to the height required for the rectangular waveguide 30, and the coaxial waveguide converter 10 can be provided. The height can be reduced.

Further, since the coaxial line is formed around the second probe 43 by the dielectric 45 and the metal film 46, the vertically polarized wave L2 is hardly lost and the intermediate portion 43B and the line connecting portion 43C are hardly lost. Can be transmitted to the microstrip line 41b along the shape of.
Further, in the second embodiment, the microstrip lines 41a, 41 are provided on the lower surface 40L of the circuit board 40.
b, the first probe 42 is provided, and another microstrip line 41c is provided on the upper surface 40U of the circuit board 40.
Since the second probe 43a is connected to one end of c and the other end is connected to the metal rod 47, it is not necessary to use a U-shaped line, and the height of the chassis main body 21 can be improved. The size can be reduced, and the coaxial waveguide converter 10 can be further downsized.

Further, in the third embodiment,
Another microstrip line 41d that can be freely bent is provided on the upper surface 40U of the circuit board 40. The second probe 43a is connected to one end of the microstrip line 41d, and the other end is inside the through hole. Tubular body 4
8 is connected to the microstrip line 41.
The arrangement position of b can be freely set, and the degree of freedom in designing the circuit pattern connected to the microstrip line 41b can be increased.

And, such a coaxial waveguide converter 10
By using the above, the downsizing of the satellite broadcast receiving converter 1 can be achieved, and further, the frequency adjustment screw 70 is provided with the frame 3 integrated with the rectangular waveguide 30.
Since it can be equipped with 1, the liquid agent seal is unnecessary,
Leakage of local signals can be eliminated. Although the three embodiments of the present invention have been described above in detail, the present invention is not limited to the above-described embodiments, and various modifications in design are made without departing from the spirit of the invention described in the claims. Is something that can be done.

For example, in the first embodiment shown in FIG.
The second probe 43 is formed of a substantially U-shaped coaxial line, but as in the coaxial waveguide converter 10 shown in FIG.
While using the V-shaped metal rod 43b, the cavity 45 is formed around the metal rod 43b on the upper surface 40U side of the circuit board 40.
By providing a, the cost of parts of the second probe 43 can be reduced, and further, the chassis main body 21
Since it is possible to prevent a short circuit between the two, it is possible to maintain the performance of the satellite broadcast receiving converter.

Further, like the coaxial waveguide converter 10 shown in FIG. 8, a substantially U-shaped metal rod 43b is used, and a dielectric is provided around the metal rod 43b on the upper surface 40U of the circuit board 40 which is the cavity. By filling the body 45b, the cost of parts of the second probe 43 can be reduced, and further, the characteristic impedance can be improved and the transmission loss can be prevented, so that the performance of the satellite broadcast receiving converter can be further improved. Can be improved.

[0042]

As can be understood from the above description, the satellite broadcast receiving converter provided with the coaxial waveguide converter according to the present invention can be miniaturized, and the efficiency and performance of frequency adjustment work can be improved. Can be improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a satellite broadcast receiving converter including a coaxial waveguide converter according to a first embodiment of the present invention.

2 is a partially exploded perspective view of the coaxial waveguide converter of FIG.

3 is a longitudinal sectional view of the coaxial waveguide converter of FIG.

4 (a) is an arrow AA of the coaxial waveguide converter of FIG.
2B is a sectional view of the coaxial waveguide converter of FIG.
Sectional drawing of B.

FIG. 5 is a second embodiment of the coaxial waveguide converter of the present invention, (a) is a vertical cross-sectional view of the coaxial waveguide converter, (b).
Is a sectional view of the coaxial waveguide converter taken along the line CC.

FIG. 6 is a third embodiment of the coaxial waveguide converter of the present invention, (a) is a vertical cross-sectional view of the coaxial waveguide converter, (b).
Is a cross-sectional view of the coaxial waveguide converter taken along the line DD.

FIG. 7 is a vertical cross-sectional view of another embodiment of the coaxial waveguide converter of the present invention.

FIG. 8 is a longitudinal sectional view of still another embodiment of the coaxial waveguide converter of the present invention.

FIG. 9 is a vertical cross-sectional view of a satellite broadcast receiving converter including a conventional coaxial waveguide converter.

10A is a vertical cross-sectional view of the coaxial waveguide converter of FIG. 9, and FIG. 10B is a cross-sectional view of the coaxial waveguide converter taken along the line EE.

[Explanation of symbols]

1 Satellite Broadcasting Converter 10 Coaxial waveguide converter 20 circular waveguide 30 rectangular waveguide 31 frames 40 circuit board 40U circuit board top surface 40L circuit board bottom surface 41a Micro strip line 41b Micro strip line 41c micro strip line 41d micro strip line 42 First probe 43 Second probe 43a Second probe 45a cavity 45b dielectric 47 metal rod 48 Cylindrical body in through hole 70 Frequency adjustment screw 80 Dielectric resonator

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Claims (8)

(57) [Claims] 1. A circular waveguide, a rectangular waveguide, and a circuit board, wherein the longitudinal axis of the circular waveguide and the longitudinal axis of the rectangular waveguide are orthogonal to each other. ,
In a coaxial waveguide converter in which the circuit board is sandwiched by its upper surface being in contact with the circular waveguide and its lower surface being in contact with the rectangular waveguide, the circuit board has a first linear polarization on its lower surface. A first probe for detecting a wave and a second probe for detecting a second linearly polarized wave penetrating the upper and lower surfaces thereof are provided, and the detected first linear polarization is provided on the lower surface of the circuit board. A microstrip line for transmitting a wave and the second linearly polarized wave, and the second probe is
One end for detecting the second linearly polarized wave, and
Coaxial waveguide converter, characterized by chromatic and the other end portion connected with Ppurain. Wherein said second probe, the coaxial waveguide converter according to claim 1, characterized in that the substantially U-shaped coaxial line of. 3. The second probe is a substantially U-shaped metal rod, and a cavity is formed around the second probe on the upper surface side of the circuit board. The coaxial waveguide converter according to claim 1 . 4. The coaxial waveguide converter according to claim 3 , wherein the cavity of the second probe is filled with a dielectric material. 5. The circuit board has another microstrip line formed on the upper surface thereof, and the microstrip line is connected to the microstrip line formed on the lower surface of the circuit board with a metal rod. The coaxial waveguide converter according to claim 1, further comprising: and another end connected to the second probe. 6. The circuit board has another microstrip line formed on an upper surface thereof, and the microstrip line is a cylindrical body in the through hole and the microstrip line formed on the lower surface of the circuit board. The coaxial waveguide converter according to claim 1, wherein the coaxial waveguide converter has one end portion to be connected and the other end portion to be connected to the second probe. Wherein said other microstrip line, a coaxial waveguide converter according to claim 5 or 6, characterized in that curved formed on the upper surface of the circuit board. 8. The method according to any one of claims 1 to 7 .
A satellite broadcast receiving converter comprising a coaxial waveguide converter.