CN101803211B - Satellite signal reception converter - Google Patents

Abstract

A satellite signal reception converter wherein a case with which a waveguide constituting a primary radiator is integrally formed accommodates a board on which a converter circuit part including reception probes is formed. In the converter circuit part having the horizontal and vertical polarization probes, two signal paths extending from a pair of feeding points of the respective probes, which amplify RF signals received by the probes, to first RF transmission lines have nearly equal path lengths. Further, the line lengths of a pair of first input lines constituting the first RF transmission lines are established such that the reactance component in a case where a first RF amplifier circuit, which is in an inactive state, is seen from a first mutual connection point is nearly zero.

Description

Converter for satellite signal reception

technical field

The present invention relates to a satellite signal receiving converter for receiving horizontally polarized radio waves and vertically polarized radio waves in a parabolic antenna for receiving transmission radio waves from satellites.

Background technique

Conventionally, as a converter for satellite signal reception that receives transmission radio waves from a plurality of satellites, it has been proposed to integrally install waveguides constituting primary transmitters corresponding to the respective satellites in a casing body, and accommodate and form a waveguide in the casing body. A converter for satellite signal reception of a substrate of a converter circuit portion (for example, refer to Patent Document 1, etc.).

According to the converter for satellite signal reception proposed in this proposal, since the substrate printed probe (probe) formed corresponding to the opening of each primary transmitter is formed on the substrate, the structure becomes simple and the conversion for satellite signal reception can be realized. device cost reduction and miniaturization.

For example, as shown in FIG. 7 , in a satellite signal receiving converter for receiving signals from two satellites, a horizontally polarized wave is formed on a substrate 23 corresponding to openings of each primary transmitter. The substrate printed detector 2 composed of detector 2a and vertically polarized wave detector 2b, the signals taken out by these detectors 2a, 2b are amplified in high-frequency (RF) amplifying circuits 3a, 3b and then switched by horizontal/vertical switching 4a, 4b selection.

The signal selected by the horizontal/vertical switches 4 a and 4 b is further selected by the satellite switch 5 , amplified in the RF amplifying circuit 6 , and input to the frequency converter 7 . The oscillation output of the local oscillator 8 is input to the frequency converter 7 . The frequency converter 7 outputs the frequency signal of the difference between the received signal from the RF amplifying circuit 6 and the signal from the local oscillator 8 as an intermediate frequency signal. The signal output from the frequency converter 7 is amplified in the intermediate frequency signal amplifier circuit 9 and then output from the terminal 10 .

Patent Document 1: Japanese Unexamined Patent Application Publication No. H10-173562

Contents of the invention

The problem to be solved by the invention

However, according to the conventional converter for satellite signal reception described above, three high-frequency switches including the horizontal/vertical switch 4a, 4b and the satellite switch 5 are used in order to receive a desired satellite signal.

However, since the cost of a high-frequency switch capable of directly switching reception signals of radio waves from satellites (for example, signals in the 12 GHz band) is very high, there is a problem that the product cost of satellite signal reception converters (and thus parabolic antennas) increases.

In addition, since the high-frequency switch is a switch for switching the path of the received signal, there is a problem that the received signal passes through the high-frequency switch and a pass loss occurs, and the C/N (carrier-to-noise ratio) of the received signal deteriorates due to the pass loss.

In addition, this problem also occurs in a converter for satellite signal reception that receives radio waves with different polarized planes transmitted from one satellite.

That is, since such a converter for satellite signal reception uses a high-frequency switch (horizontal/vertical switching switch) for switching polarized waves, the received signal passes through the high-frequency switch and a pass loss occurs. As /N deteriorates, the pass loss becomes a non-negligible loss.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a satellite signal receiving converter capable of switching the polarized wavefront of a received signal and a receiving satellite without using a high-frequency switch.

means to solve the problem

A first aspect of the present invention to achieve the above object is a satellite signal receiving converter, which is formed by accommodating a substrate in a case integrally provided with a waveguide constituting a primary transmitter, and on the substrate A converter circuit portion including a detector for satellite signal reception is formed, characterized in that,

The converter circuit part formed on the substrate includes:

The detector for horizontally polarized waves and the detector for vertically polarized waves are arranged at positions corresponding to the opening of the primary transmitter, and respectively receive two kinds of electric waves whose polarized wave surfaces are orthogonal to each other;

A pair of first RF amplifier circuits are respectively connected to the power supply points of the detectors, and amplify the RF signals received by the detectors;

The RF amplification control circuit switches the operating states of the pair of first RF amplifier circuits based on external control signals, so that when one of the first RF amplifier circuits operates, the other first RF amplifier circuit operates. Circuit non-operation;

The first RF transmission line is respectively connected to the output side of the pair of first RF amplifying circuits, and transmits the output from each of the first RF amplifying circuits to the first RF amplifying circuit through a pair of first input lines having substantially the same line length. an interconnection point and output from the first interconnection point via a first output line;

a filter circuit selectively passing RF signals amplified by the respective first RF amplifying circuits among signals output from the first output line of the first RF transmission line;

a frequency conversion circuit that converts the frequency of the RF signal that has passed through the filter circuit into an IF signal of an intermediate frequency band; and

an IF amplifier circuit for amplifying the IF signal frequency-converted by the frequency conversion circuit,

The two signal paths from the power supply points of the respective detectors to the respective first RF transmission lines are formed with approximately equal path lengths,

In addition, the line length of a pair of first input lines constituting each of the first RF transmission lines is set so that the reactance component becomes substantially zero when the first RF amplifier circuit in a non-operating state is viewed from the first interconnection point.

In addition, a second aspect of the present invention is the satellite signal receiving converter of the first aspect, characterized in that a first interconnection point of the first RF transmission line is provided for adjusting The first adjusting means of the transmission characteristic of the RF signal in the input line makes the reactance component substantially zero when the first RF amplifier circuit in a non-operating state is seen from the first interconnection point.

Furthermore, a third aspect of the present invention is the satellite signal receiving converter of the second aspect, wherein the first adjusting member is formed of a stub whose length can be adjusted.

On the other hand, a fourth aspect of the present invention is the converter for satellite signal reception according to any one of the first to third aspects, wherein two primary transmitter waveguide,

On the substrate, as part of the converter circuit,

For each of the primary transmitters, the detector for horizontally polarized waves, the detector for vertically polarized waves, the pair of first RF amplifying circuits, and the first RF transmission line are provided. ,

And, set:

A pair of 2nd RF amplifying circuits, respectively connected to the 1st output lines corresponding to the 1st RF transmission lines of the respective primary transmitters, and amplifying the RF signals output from the respective 1st RF transmission lines; and

The 2nd RF transmission line is respectively connected to the output side of the pair of 2nd RF amplifying circuits, and the output from each of the 2nd RF amplifying circuits is transmitted to the a second interconnection point, and from the second interconnection point, via a second output line, to the filter circuit,

The RF amplification control circuit is configured to operate one of a total of four first RF amplification circuits provided to the two primary transmitters based on an external control signal, and to stop the operation of the other first RF amplification circuits, and In the pair of second RF amplifying circuits, the second RF amplifying circuit that amplifies the RF signal output from the operating first RF amplifying circuit is operated, and the operation of the other second RF amplifying circuits is stopped,

The four signal paths from the power supply points of the respective detectors to the respective second RF transmission lines are formed to have substantially equal path lengths,

In addition, the line lengths of the pair of input lines constituting the second RF transmission line are set such that the reactance component when the second RF amplifier circuit in a non-operating state is viewed from the second interconnection point becomes substantially zero.

In addition, a fifth aspect of the present invention is the satellite signal receiving converter of the fourth aspect, wherein a printed wiring pattern provided on the substrate for forming the converter circuit part is wherein, the printed wiring model from the pair of detectors respectively corresponding to the two primary emitters to the second interconnection point is formed relative to the center of the intermediate point passing through the two primary emitters The line becomes approximately line symmetric.

In addition, a sixth aspect of the present invention is the converter for satellite signal reception according to the fourth or fifth aspect, characterized in that a second interconnection point of the second RF transmission line is provided for adjusting the The second adjusting means for the transmission characteristics of RF signals in the respective second input lines makes the reactance component substantially zero when the second RF amplifying circuit in a non-operating state is seen from the second interconnection point.

Furthermore, a seventh aspect of the present invention is the satellite signal receiving converter of the sixth aspect, wherein the second adjustment member is formed of a stub whose length can be adjusted.

Invention effect

In the converter for satellite signal reception according to the first aspect of the present invention, the polarized wave surface commanded from the outside is selected from the signals (RF signals) received by the horizontal polarized wave detector and the vertical polarized wave detector. When the signal is high, the RF amplification control circuit is used instead of the high-frequency switch as in the past.

In addition, the RF amplification control circuit operates any one of the pair of first RF amplification circuits that amplify the received signals (RF signals) from the respective probes, and keeps the other circuits in a non-operational state. The control signal is used to select the RF signal that causes the frequency conversion circuit to perform frequency conversion.

Therefore, according to the converter for satellite signal reception of the present invention, it is not necessary to use a high-frequency switch for switching polarized wavefronts as in the past, so that the converter circuit portion can be realized at low cost.

In addition, if, as in the present invention, one of the pair of first RF amplifying circuits is operated and the other circuit is stopped to select the RF signal output to the filter circuit (and further, the frequency conversion circuit), it will be considered that the RF signal passed through the first RF amplifier circuit 1. The RF signal output to the first output line connected to each other is affected by the transmission line (first input line) on the side of the first RF amplifying circuit that stops operating.

However, in the satellite signal receiving converter of the first aspect of the present invention, the length of the transmission path from the power supply point of each probe through the first RF amplifier circuit and the first input line to the first mutual connection point is set as They are substantially the same, and the line lengths of the first input lines for transmitting the RF signals from the respective probes are set so that the reactance component becomes approximately zero when the first RF amplifying circuit in a non-operating state is viewed from the first interconnection point.

Therefore, in a pair of first RF amplifying circuits, when one circuit is operated and the other circuit is stopped, the frequency characteristic of the RF signal output to the filter circuit (and further, the frequency conversion circuit) is not affected by the first RF amplification that stops the operation. The effect of the first input line on the circuit side is scattered.

Therefore, according to the converter for satellite signal reception of the present invention, it is possible to stably select a reception signal (RF signal) of a polarized wavefront commanded from the outside without deteriorating the frequency characteristics of the signal, and it is possible to convert The selected RF signal is frequency converted to the desired IF signal.

Here, in the present invention, the length of the first input line is set so that the reactance component becomes substantially zero when the RF amplifying circuit in a non-operating state is viewed from the first interconnection point, but the length for making the reactance component zero It changes according to variations in the characteristics (in particular, output impedance) of the first RF amplifier circuit.

Therefore, when mass-producing converters for satellite signal reception, it is desirable to adjust the length of the first input line (specifically, its transmission characteristics) according to the deviation. For this reason, as in the second aspect of the present invention, in the The first interconnection point of one RF transmission line may be provided with a first adjusting member for adjusting the transmission characteristic of the RF signal in each first input line.

That is, in this way, the transmission characteristics of the RF signal in the first input line can be adjusted by the first adjustment member so that the reactance component when the RF amplifier circuit in the non-operating state is viewed from the first interconnection point becomes substantially zero, even if Even if the characteristics of the first RF amplifier circuit etc. vary, the RF signal can be favorably selected and frequency converted.

In addition, as the first adjustment means, as long as the transmission characteristics of the first input line constituting the first RF transmission line can be adjusted, for example, a capacitor whose capacitance can be adjusted may be provided between the first interconnection point and the ground, Adjust its capacitance. However, as in the third aspect of the present invention, if the first adjusting member is formed of a stub whose length can be adjusted, the structure can be made extremely simple.

That is, as shown in FIGS. 1A and 1B , the stub can be composed of a wiring pattern in which a pair of input lines and interconnection points are formed on the substrate together, and when adjusting the characteristics of the input line, the length of the stub is adjusted, The impedance when the RF amplifier circuit in the non-operating state is seen from the interconnection point may be changed from point A shown in FIG. 1C to point C, for example.

Therefore, if a stub is used as the first adjustment means, not only can the structure be simplified, but also the characteristics of the first input line can be adjusted extremely simply, and a converter for satellite signal reception can be realized at low cost.

In addition, FIG. 1C uses a Smith chart (the figure is an impedance diagram) to show the impedance change caused by setting a stub at an interconnection point, and point A on the Smith chart indicates that no stub is set as shown in FIG. 1A , the impedance of the RF amplifier circuit in the non-operating state viewed from the interconnection point.

In addition, in FIG. 1C, point C indicates that a short stub is provided as shown in FIG. 1B, and its length is adjusted so that the impedance when the RF amplifier circuit in a non-operating state is seen from the mutual connection point is reduced to only the reactance component. In an optimum state, the area B from point A to point C and the area D beyond point C represent changes in impedance that vary according to the length of the stub.

In addition, if the reactance component of the RF amplifier circuit in a non-operating state is substantially zero when viewed from the interconnection point, a resistance is connected to the interconnection point, so even if the resistance value is small, the RF signal may Attenuation does not disturb the frequency characteristics of the RF signal, so the RF signal received by a specific probe can be transmitted to the subsequent frequency conversion circuit well.

In addition, when the RF amplifier circuit is not in operation (the operating power supply is turned off, etc.), the input/output impedance (corresponding to the above-mentioned resistance value) of the RF amplifier circuit generally shows a high value, so the attenuation of the RF signal becomes very small, Practically, no problem arises.

Next, in the converter for satellite signal reception according to the fourth aspect of the present invention, in the case, waveguides constituting two primary transmitters are respectively provided, and on the substrate, each of the primary transmitters , a detector for horizontally polarized waves, a detector for vertically polarized waves, a pair of first RF amplifying circuits and a first RF transmission line are provided.

And, on the first output line of the first RF transmission line corresponding to each primary transmitter, the 2nd RF amplifying circuit is respectively connected, and the RF amplifying control circuit makes a total of 4 sets of two primary transmitters based on the control signal from the outside. One of the first RF amplifying circuits operates, and the operation of the other first RF amplifying circuits is stopped, and in the pair of second RF amplifying circuits, the second RF amplifying the RF signal output from the operating first RF amplifying circuit is amplified. The circuit operates to stop the operation of the other second RF amplifying circuit.

In addition, to the output side of the second RF amplifying circuit that selectively switches the operating state in this way, a second RF transmission line having substantially the same configuration as the first RF transmission line is connected, and in the filter circuit (and further, the frequency conversion circuit), via An RF signal is input to the second RF transmission line.

Therefore, according to the converter for satellite signal reception of the present invention, one of the reception signals (RF signals) received by a total of four detectors provided for two primary transmitters is selectively transmitted to The frequency conversion circuit can select the RF signal of the desired polarized wave surface transmitted from the desired satellite without using two high-frequency switches for polarized wave switching and three high-frequency switches for satellite switching as in the past. switch,

In addition, in the converter for satellite signal reception according to the fourth aspect of the present invention, the four signal paths from the power supply point of each probe to each second RF transmission line are formed so that the path lengths are approximately equal, and the second RF transmission line is constituted The line length of the pair of input lines is set so that the reactance component becomes substantially zero when the second RF amplifier circuit in a non-operating state is viewed from the second interconnection point.

Therefore, even if the RF amplifier control circuit stops the operation of the three first RF amplifier circuits and one second RF amplifier circuit in order to select the RF signal of the satellite/polarized wavefront commanded from the outside, it outputs to the filter circuit (and further, the frequency conversion circuit) The frequency characteristics of the RF signal will not be disturbed by the signal path on the side of the RF amplifier circuit that stops operating, and the RF signal of the satellite/polarized wavefront commanded from the outside can be stably transmitted to the frequency conversion circuit.

In addition, in the converter for satellite signal reception according to the fourth aspect of the present invention, in order to more stably transmit the RF signal of the satellite/polarized wavefront commanded from the outside to the frequency conversion circuit, as in the fifth aspect of the present invention, In the printed wiring model provided on the substrate to form the converter circuit part, the printed wiring model from a pair of detectors corresponding to two primary emitters to the second interconnection point is formed relative to the through The center line of the intermediate point of the two primary transmitters is substantially line-symmetric.

In addition, as in the sixth aspect of the present invention, similar to the first interconnection point of the first RF transmission line, the second interconnection point of the second RF transmission line may be provided for adjusting the voltage in each second input line. It is preferable that the second adjusting means of the transmission characteristic of the RF signal makes the reactance component substantially zero when the second RF amplifying circuit in the non-operating state is seen from the second interconnection point.

Also, as in the seventh aspect of the present invention, if the second adjustment member is made of stub wires whose length can be adjusted in the same way as the first adjustment member, the structure of the second adjustment member can be simplified, and its operation can be performed extremely simply. Length adjustment.

Description of drawings

1A to 1C are explanatory diagrams for explaining operations when the transmission characteristics of an input line are adjusted using a stub.

2A-2B are schematic configuration diagrams showing the configuration of the satellite signal reception converter according to the first embodiment.

3 is a circuit configuration diagram showing a circuit configuration of a converter circuit portion of the first embodiment.

4 is an explanatory view showing the structure of a printed circuit board on which a converter circuit portion of the first embodiment is formed.

5A-5B are explanatory diagrams explaining in detail the periphery of the first RF transmission line and the periphery of the second RF transmission line in FIG. 4 .

6 is a circuit configuration diagram showing a circuit configuration of a converter circuit portion according to a second embodiment.

7 is a circuit configuration diagram showing a circuit configuration of a converter circuit portion of a conventional satellite signal receiving converter.

Label description

1...converter circuit section, 2...detector, 2a...detector for horizontal polarized wave, 2b...detector for vertical polarized wave, 3a, 3b...1st RF amplifier circuit , 6a, 6b...the second RF amplifying circuit, 7...frequency converter, 8...local oscillator, 9...IF amplifying circuit, 10...terminal, 11...RF amplifying control circuit , 12a, 12b...Detector power supply point, 13a, 13b...Capacitor, 14...1st RF transmission line, 15...1st input line, 16...1st interconnection point, 17. ..1st output line, 18...stub line, 18a...miniature model (pattern), 19...filter circuit, 19a... ...input terminal, 20... ... Converter circuit part, 21, 22, 23...printed substrate, 24...2nd RF transmission line, 25...2nd input line, 26...2nd interconnection point, 27...1st 2 output lines, 28...stub lines, 28a-1, 28a-2...markers, 29...capacitors, 34...RF transmission lines, 35...1st input lines, 36.. .1st interconnection point, 37...1st output line, 38...stub line, 40...housing body, 40a...bottom surface, 41...primary emitter, 42...circle Shaped waveguide, 43... primary transmitter opening part, 44... choke coil (choke), 45... terminal part, 46... space, 47... shielding (shield) member, 48. ..IF output terminal.

Detailed ways

Hereinafter, embodiments of the present invention will be described together with the drawings.

[First Embodiment]

2A-FIG. 2B show the structure of the converter for satellite signal reception to which the first embodiment of the present invention is applied. FIG. 2A is a rear view showing the appearance of the shell main body of the converter for satellite signal reception. FIG. Line sectional view of 2B-2B`.

In addition, in the following description, when expressing a direction, unless otherwise specified, the right direction (direction in which the primary transmitter 41 is installed) in FIG. 2B is set to front, and the left direction is set to rear.

In FIG. 2A and FIG. 2B , 40 is a case main body constituting the satellite signal reception converter according to the present embodiment, and is a main body formed of a conductive material such as cast aluminum. On the front side of the case main body 40 , a primary transmitter 41 is integrally formed with the case main body 40 .

Since the primary transmitter 41 can handle the reception of radio waves from two satellites, it is composed of two circular waveguides 42, 42, and the two circular waveguides 42, 42 are integrally formed in the main body of the case to They are arranged side by side while maintaining an appropriate interval. Therefore, in the case main body 40 , opening portions 43 , 43 of the two primary emitters 41 are formed at the connecting portion of the two circular waveguides 42 , 42 .

In addition, by arranging a plurality of choke coils 44 (three choke coils in the embodiment of the present invention) at appropriate intervals on the outer circumference of the front end of the circular waveguides 42, 42, good frequency characteristics.

In addition, by providing a wall surface on the rear side of the case main body 40 so as to protrude from the four sides of the bottom surface 40a of the case main body 40 to the rear side, a space 46 having an opening on the back side is formed, and the space 46 and the circular waveguide 42, 42 communicates via primary emitter opening portions 43 , 43 formed on the bottom surface 40 a of the case main body 40 .

In the present embodiment, the printed circuit board 21 on which the converter circuit portion 1 is formed is housed in the space 46 . Furthermore, a shielding member 47 is attached to the printed board 21 for fixing the printed board 21 to the bottom surface 40 a using known screws or the like.

The shielding member 47 is made of a conductive material such as cast aluminum, and integrally forms a shielding wall that shields between the terminal portion 45 of the primary transmitter 41 , an RF amplifier circuit described later, a local oscillator, and the like.

In addition, 48 in FIGS. 2A and 2B is an IF output terminal connected to the terminal 10 of the converter circuit part 1 inside the case main body 40 and for taking out a received signal to the outside. The IF output terminal 48 may be integrally formed with the case main body 40, or may be formed separately.

Next, FIG. 3 is a circuit configuration diagram showing the circuit configuration of the converter circuit section 1 formed on the printed circuit board 21 . In addition, the printed circuit board 21 on which the converter circuit section 1 is formed can be mounted so as to be sandwiched by the bottom 30 a of the space 46 by known fixing members (such as screws) and a shield member 47 .

As shown in FIG. 3 , on the printed circuit board 21 , the detector 2 is formed by a printed wiring pattern at positions corresponding to the openings 43 , 43 of the above-mentioned two primary emitters. The probe 2 is constituted by a set of a horizontally polarized wave probe 2a and a vertically polarized wave probe 2b, and each set of probes 2 is provided in openings 43, 43 of each primary emitter.

In addition, in this embodiment, the probe 2 is formed from the printed wiring model, but the probe 2 may be formed from a metal body or the like differently from the printed wiring model.

Next, the first RF amplifying circuit 3a for amplifying the signal of the horizontally polarized wave taken out by the detector 2a is connected to the output side of the horizontally polarized wave detector 2a and the vertically polarized wave detector 2b, respectively. , 3a, and first RF amplifying circuits 3b, 3b for amplifying the vertically polarized wave signal taken out by the probe 2b (that is, first RF amplifying circuits of all four systems in this embodiment).

The first RF amplifying circuits 3a, 3b, 3a, and 3b composed of these four systems are composed of high-frequency amplifying elements such as HEMT (High Electron Mobility Transistor: High Electron Mobility Transistor) or FET, and are taken out through the detector 2. The signal is properly amplified and then output. In addition, in the present embodiment, each of the first RF amplifier circuits 3a, 3b, 3a, and 3b is constituted by using HEMTs, and may be constituted by one transistor as shown in the figure, or may be constituted by connecting a plurality of HEMTs in multiple stages. .

In addition, these four first RF amplifying circuits 3a, 3b, 3a, and 3b selectively switch their operating states so that when any one system of the first RF amplifying circuit 3 operates, the remaining three systems of the first RF amplifying circuits 3 become inoperative. In order to be able to deal with the signals from the two satellites, the desired signal is received.

And this switching operation is performed by the RF amplification control circuit shown by 11 in FIG.

Next, on the output side of these first RF amplifying circuits 3a, 3b, 3a, 3b, each first RF amplifying circuit 3a of the first RF amplifying circuits 3a, 3b of the two systems corresponding to the respective primary transmitter openings 43, 43 , 3b, the first RF transmission line 14 (in this embodiment, two first RF transmission lines) is connected.

The first RF transmission line 14 is formed by a printed wiring model, and is at least composed of the first input lines 15, 15, the first interconnection point 16 connected to the output side of the first input lines 15, 15, and connected to the first The first output line 17 of the mutual connection point 16 constitutes, wherein, the first input lines 15, 15 are connected to the output side of the first RF amplifying circuits 3a, 3b, and are formed to amplify the signals in the first RF amplifying circuits 3a, 3b are transmitted and have the same line length.

That is, the first RF transmission lines 14, 14 are configured to receive signals (RF signals) of horizontally polarized waves or vertically polarized waves selectively amplified in either of the corresponding first RF amplifying circuits 3a, 3b, respectively. ) is output to the first output line 17. Furthermore, stub lines 18 connected to the first interconnection point 16 of the first input line 15 are respectively provided in the first RF transmission lines 14 and 14 of these two systems.

The stub 18 is used to adjust the transmission characteristics of the RF signal so that when either of the two first RF amplifying circuits 3a, 3b connected to the first interconnection point 16 via the pair of first input lines 15 stops operating, , a line that does not affect the frequency characteristics of the received signal (RF signal) output from another amplifier circuit.

That is, in the present embodiment, when either one of the two first RF amplifier circuits 3a, 3b connected to the first interconnection point 16 stops operating, the other amplifier circuit will always be in a stopped state.

Therefore, in the present embodiment, the length of each first input line 15 is set such that the reactance component of the impedance when the RF amplifier circuit in a non-operating state is seen from the first interconnection point 16 becomes substantially zero, so that the The frequency characteristics of the amplified RF signal are affected, and in order to compensate for the deviation of the characteristics that cannot be adjusted by setting the length, stubs 18 are provided, so that the transmission characteristics of the RF signals in each of the first input lines 15 can be adjusted. .

Next, a second RF transmission line 24 is connected to the output side of the first RF transmission lines 14 , 14 via the second RF amplifier circuits 6 , 6 in the subsequent stage.

These two second RF amplifying circuits 6, 6 are composed of high-frequency elements such as HEMTs similarly to the first RF amplifying circuits 3a, 3b of the preceding stage, and the operating state is switched by the RF amplifying control circuit 11 so that either one is in an operating state, The other becomes the motion stop state.

That is, in the present embodiment, the RF amplifier control circuit 11 operates one of the four first RF amplifier circuits 3 and one of the two second RF amplifier circuits 6, and makes all other RF amplifier circuits stop operating, thereby selecting The reception signal (RF signal) of the satellite/polarized wavefront commanded from an external device such as a satellite tuner is output to the second RF transmission path 24 .

In addition, the second RF amplifying circuits 6, 6 may have a multi-stage structure similarly to the preceding first RF amplifying circuits 3a, 3b, or may not be present.

Next, the second RF transmission line 24 is formed by a printed wiring model, and is at least composed of the second input lines 25, 25, the second interconnection point 26 connected to the output side of the second input lines 25, 25, and connected to the first 2 The second output line 27 of the mutual connection point 26 is formed, wherein the second input lines 25, 25 are connected to the output side of the first RF transmission line 14, 14, and are formed to receive the output from the first RF transmission line 14, 14 The signals are transmitted and have the same line length.

That is, the second RF transmission line 24 is configured to output a reception signal from a desired satellite among two satellites to the second output line 27 . In addition, in the second RF transmission line 24, stub lines 28 connected to the first interconnection points 26 of the second input line 25 are respectively provided.

Similar to the aforementioned stub 18, the stub 28 is used to adjust the transmission characteristics of the RF signal so that the two second RF signals connected to the second interconnection point 26 via a pair of second input lines 25 and 25 A line that does not affect the frequency characteristics of the received signal (RF signal) output from the other amplifier circuit when one of the amplifier circuits 6, 6 stops operating.

That is, in the present embodiment, when any one of the two second RF amplifier circuits 6, 6 connected to the second interconnection point 26 stops operating, the other amplifier circuit will always be in a stopped state.

Therefore, in the present embodiment, the length of each second input line 25 is set such that the reactance component of the impedance when the RF amplifier circuit in a non-operating state is seen from the second interconnection point 26 becomes substantially zero, so that the The frequency characteristic of the amplified RF signal is affected, and in order to compensate for the deviation of the characteristic that cannot be adjusted by setting the length, the stub 28 is provided, so that the transmission characteristic of the RF signal in each second input line 25 can be adjusted. .

Next, a filter circuit 19 is connected to the output side of the second RF transmission line 24 . The filter circuit 19 is a circuit for selectively passing a received signal passing through the second RF transmission line 24, and is configured as a bandpass filter in the present embodiment by using a printed wiring model.

Further, a frequency converter 7 is connected to the output side of the filter circuit 19 , and a desired signal that has passed through the filter circuit 19 is input to the frequency converter 7 . Furthermore, a local oscillator 8 is connected to the frequency converter 7, and the local oscillator output generated by the local oscillator 8 is input to the frequency conversion unit 7, whereby an intermediate frequency signal (IF signal) is output from the frequency conversion unit 7. The intermediate frequency signal (IF signal) has a frequency that is the difference between the desired signal output from the filter circuit 19 and the local oscillation output from the local oscillator 8 . In addition, frequency converter 7 and local oscillator 8 constitute a frequency conversion circuit of the present invention.

Furthermore, on the output side of the frequency converter 7, an IF amplifying circuit 9 is connected. The IF amplifying circuit 9 is composed of, for example, a high-frequency element such as a transistor or an IC, and amplifies the IF signal generated by the frequency converter 7 to output it. Furthermore, the output side of the IF amplifier circuit 9 is connected to a terminal 10 , and the IF signal is output to the outside through the terminal 10 .

Next, FIG. 4 is a structural diagram showing the specific structure of the printed circuit board 21 on which the converter circuit part 1 is formed, and FIG. 5A is a detailed description from the power supply point 12a of the probe 2 in FIG. 4 to the first RF transmission line 14. Fig. 5B is a detailed diagram of the second RF transmission line 24 in Fig. 4 .

As shown in FIG. 4, the horizontally polarized wave detector 2a and the vertically polarized wave detector 2b respectively provided in the two primary transmitter openings 43, and the RF amplifier circuits 3a, 3b pass from each detector 2a The power supply points 12a and 12b of 2b are connected by the extended transmission line (printed wiring model), and the received signal taken out from the detector power supply part 12a, 12b is amplified by the RF amplifier circuit 3a, 3b.

On the output side of the RF amplifying circuits 3a, 3b, capacitors 13a, 13b (refer to FIG. 5A) that receive signals and cut off the DC power supply are connected, and each RF amplifying circuits 3a, 3b are connected to the first RF transmission through the capacitors 13a, 13b. The first input of line 14 is line 15 . In addition, the capacitors 13a and 13b can be constituted by chip type capacitors shown in FIG. 5A, but they can also be formed by printed wiring models because they can receive signals and cut off the DC power supply.

Furthermore, in this embodiment, the signal path from the probe power supply point 12a to the output end of the capacitor 13a via the RF amplifier circuit 3a and the signal path from the probe power supply point 12b to the output end of the capacitor 13b via the RF amplifier circuit 3b are formed as paths approximately equal in length. In addition, as already described, the pair of first input lines 15 and 15 constituting the first RF transmission line 14 are also formed so that the line lengths are substantially equal.

Therefore, the path from the probe power supply point 12 a to the first interconnection point 16 of the first RF transmission line 14 is substantially equal to the path from the probe power supply point 12 b to the first interconnection point 16 of the first RF transmission line 14 .

In addition, the path from the probe power supply point 12a to the first RF transmission line 14, the path from the probe power supply point 12b to the first RF transmission line 14, and the openings 43, 43 of the first RF transmission line 14 to the two primary transmitters They are provided separately, and these parts are formed to be line-symmetric with respect to a centerline CL passing through the middle points of the openings 43 , 43 (in this embodiment, a centerline connecting the center points in the left-right direction of the printed circuit board 21 ).

In addition, in the second RF transmission line 24, the printed wiring model forming the second output line 27 is arranged so as to be located on the above-mentioned center line CL, and the printed wiring models forming the second input lines 25, 25 are formed so that It becomes line symmetric across the center line CL.

Therefore, in the present embodiment, among the four signal paths from each probe power supply point 12 to the second interconnection point 26 of the second RF transmission line 24 , the transmission path lengths are substantially equal to any signal path.

In addition, as shown in FIG. 5A, the stub line 18 connected to the first interconnection point 16 of the first RF transmission line 14 is located approximately in the center between the pair of first input lines 15, 15, and is formed to be aligned with the first RF transmission line 14. 1 The output line 17 protrudes oppositely. In addition, in the vicinity of the tip of the stub 18, a micromodel 18a of the printed wiring is formed with a small space therebetween.

The micromodel is used to adjust the length of the stub 18, and the tip of the stub 18 and the micromodel 18a are connected by a known method such as brazing to easily adjust the length of the stub 18.

In addition, as shown in FIG. 5B, by forming a stub line 28 connected to the second interconnection point 26 of the second RF transmission line 24, it protrudes from one of the pair of second input lines 25, 25 (Fig. The second input line on the right side of the center) and the second output line 27 in the approximate center (left and right in the figure), thereby extending between the second output line 27 and the input terminal 19a of the filter circuit 19, in the width The width is integrated with the second output line 27 .

In addition, in the vicinity of the outside of the base and tip of the stub 28, a mark 28a-1 to be used as a mark when adjusting the width or length of the stub 28 on the printed circuit board 21 is formed by resist printing. , 28a-2, using the marks 28-1, 28-2 as a reference, connect a conductive material to the printed wiring pattern of the stub 28, and thus the length adjustment of the stub 28 can be easily performed.

As described above, in the converter for satellite signal reception of this embodiment, in the converter circuit section 1, the signal path from the probe feed point 12a and the probe feed point 12b to the first RF transmission line 14 is formed approximately The signal paths have the same length and are formed substantially line-symmetrically with respect to the center line CL passing through the middle point of the primary transmitter openings 43 , 43 for each of the primary transmitters corresponding to these signal paths. In addition, the second RF transmission line 24 is arranged so that the second output line 27 is located on the center line CL, and the printed wiring patterns of the second input lines 25 and 25 are formed to be substantially line-symmetric across the center line CL. Therefore, any signal path among the four signal paths from the four probe power supply points 12 to the second interconnection point 26 of the second RF transmission line 24 has approximately the same transmission path length.

In addition, in the first RF transmission line 14 and the second RF transmission line 24, adjustable length stubs 18, 28 are provided on the interconnection units 16 and 26, respectively, and the input can be adjusted via these respective stubs 18, 28. The transmission characteristics of the lines 15 and 25 are such that the reactance component of the impedance is substantially zero when the RF amplifier circuits 3 and 6 in the stopped state are seen from the interconnection points 16 and 26 .

Therefore, according to the converter for satellite signal reception of this embodiment, the RF amplifying circuits 3 and 6 to be operated are selected via the RF amplifying control circuit 11, so that the satellite to be received and the polarized wavefront can be switched, and it is possible to prevent passing The frequency characteristic of the received signal (RF signal) selected by this switching does not change due to the influence of the transmission line on the side of the RF amplifier circuits 3 and 6 that have stopped operating.

Therefore, according to the converter for satellite signal reception of this embodiment, it is possible to switch between a satellite and a polarized wavefront without using a conventional high-frequency switch, and the converter circuit section 1 can be realized at low cost.

[Second Embodiment]

Next, a second embodiment of the present invention will be described.

6 is a circuit configuration diagram of a converter circuit portion constituting a converter for satellite signal reception according to a second embodiment. In addition, in the following description, the same code|symbol is attached|subjected to the same component as the converter for satellite signal reception of 1st Embodiment, and detailed description is abbreviate|omitted.

In the first embodiment, the converter for satellite signal reception including the converter circuit section 1 is described, wherein the converter circuit section 1 is configured to be able to receive signals from two satellites with horizontally polarized waves and vertically polarized waves. Among the four transmitted signals, selection of polarized waves and selection of satellites are performed, but in this embodiment, a converter for satellite signal reception including a converter circuit section 20 is shown, wherein the converter circuit section 20 is configured as It is possible to perform a signal of a desired polarized wave surface out of two signals transmitted from one satellite as a horizontally polarized wave and a vertically polarized wave.

As shown in FIG. 6 , in the converter circuit part 20 of this embodiment, the printed circuit board 22 includes: a group of detectors 2 connected with a primary emitter provided on the main body of the case (not shown). The horizontally polarized wave detector 2a and the vertically polarized wave detector 2b arranged correspondingly to the opening portion 43 are constituted; the first RF amplifying circuits 3a and 3b of the two systems amplify the received signals taken out from the respective detectors 2a and 2b and a 1st RF transmission line 34, which is arranged on the output side of these respective 1st RF amplifying circuits 3a, 3b, and makes the 2 1st RF amplifying circuits 3a, 3b by the RF amplifying control circuit 11 according to the control signal from the external device Either operation stops the operation of the other, selects an RF signal of a polarized wavefront commanded from the outside, and outputs it from the first RF transmission line 34 to the subsequent filter circuit 19 .

In addition, like the first embodiment, the first RF transmission line 34 includes: a pair of first input lines 35, 35 having approximately the same line length; point 36; and the third output line 37 connected to the first interconnection point 36, the path lengths of the two signal paths from each detector 2a, 2b to the first interconnection point 36 are approximately equal in any signal path.

In addition, similarly to the first embodiment, a stub 38 whose length can be adjusted is provided on the first interconnection point 36, and the transmission characteristics of the first input lines 35, 35 can be set through the stub 38, The reactance component of the impedance when the first RF amplifying circuit 3 in the stopped state is seen from the first interconnection point 36 becomes substantially zero.

Therefore, according to the converter for satellite signal reception of this embodiment, it is possible to select a received signal (RF signal) of a desired polarized wavefront and convert the frequency into an IF signal without using a high-frequency switch as in the past, and the converter circuit part 20 can be simplified. structure, which can be implemented cheaply.

As mentioned above, two embodiments of the present invention have been described, but the present invention is not limited to the above-mentioned embodiments, and various forms can be taken without departing from the spirit of the present invention.

For example, in the above-mentioned embodiment, as the first interconnection point 16 (36) of the first RF transmission line 14 (34) or the second interconnection point 26 of the second RF transmission line 24, a device for correcting the first input The structure of the stubs 18 ( 38 ), 28 of the transmission characteristic of the line 15 ( 35 ) or the second input line 25 is explained.

However, by setting the length of the first input line 15 (35) or the second input line 25, the RF amplifying circuit in the non-operating state can be viewed from the first interconnection point 16 (36) or the second interconnection point 26 When the reactance component of the impedance at 3 or 6 is substantially zero, the stubs 18 ( 38 ), 28 can be deleted.

In addition, these stubs 18 ( 38 ), 28 do not need to be formed by printed wiring patterns as shown in FIGS. 5A and 5B , but may be formed by connecting conductors to interconnection points 16 ( 36 ) or 26 . In addition, the shapes of these stubs 18 ( 38 ), 28 also need only be appropriately set. Furthermore, the stubs 18 ( 38 ), 28 may be replaced by short-circuited stubs as in the above-mentioned embodiment. A short stub is formed.

Claims (8)

1. satellite signal reception converter forms by hold substrate in the shell that is provided with integratedly the waveguide that consists of once-used emitter, has formed the converter circuit part of the detector that comprises receiving signals from satellites at described substrate, it is characterized in that,

The converter circuit that forms at described substrate partly comprises:

Horizontal polarized wave is with detector and vertically polarized wave detector, is configured in the correspondence position with the opening portion of described once-used emitter, and receives respectively the two kinds of mutually orthogonal electric waves of corrugated that polarize;

A pair of 1RF amplifying circuit is connected respectively to the supply terminals of described each detector, and the RF signal that receives by described each detector is amplified;

The RF amplification control circuit based on the control signal from the outside, switches the operate condition of described a pair of 1RF amplifying circuit, so that in described a pair of 1RF amplifying circuit, during a 1RF amplifying circuit action, the non-action of another 1RF amplifying circuit;

The 1RF transmission line, be connected respectively to the outlet side of described a pair of 1RF amplifying circuit, to transfer to the 1st interlinkage via a pair of the 1st incoming line with identical line length from the output of described each 1RF amplifying circuit, and export via the 1st outlet line from the 1st interlinkage;

Filter circuit, will from the signal of the 1st outlet line of described 1RF transmission line output, the RF signal-selectivity ground that amplifies by described each 1RF amplifying circuit passes through;

Frequency-conversion circuit, making the RF signal frequency converting that has passed through described filter circuit is the IF signal of midband; And

The IF amplifying circuit amplifies the IF signal that has carried out frequency translation by described frequency-conversion circuit,

Two signal paths from the supply terminals of described each detector to described each 1RF transmission line are formed path and equate,

And the reactive component the when line length that consists of a pair of the 1st incoming line of described each 1RF transmission line is set to and sees the 1RF amplifying circuit that is in non-action status from described the 1st interlinkage becomes zero,

Be provided with for the 1st of the transmission characteristic of the RF signal that is adjusted at described each the 1st incoming line at the 1st interlinkage of described 1RF transmission line and adjust member, so that the reactive component when seeing the 1RF amplifying circuit that is in non-action status from described the 1st interlinkage becomes zero.

2. satellite signal reception converter as claimed in claim 1 is characterized in that,

The described the 1st adjusts member is made of length-adjustable stub.

3. satellite signal reception converter as claimed in claim 1 or 2 is characterized in that,

In described shell, be respectively arranged with the waveguide that consists of two once-used emitters,

On described substrate, as described converter circuit part,

To each reflector in described each once-used emitter, described horizontal polarized wave detector, described vertically polarized wave detector, described a pair of 1RF amplifying circuit and described 1RF transmission line are set,

And, arrange:

A pair of 2RF amplifying circuit is connected respectively to the 1st outlet line corresponding to the 1RF transmission line of described each once-used emitter, and the RF signal from described each 1RF transmission line output is amplified; And

The 2RF transmission line, be connected respectively to the outlet side of described a pair of 2RF amplifying circuit, and will be from the output of described each 2RF amplifying circuit, via a pair of the 2nd incoming line with identical line length, transfer to the 2nd interlinkage, and from the 2nd interlinkage, via the 2nd outlet line, output to described filter circuit

Described RF amplification control circuit constitutes, based on the control signal from the outside, make one of totally 4 1RF amplifying circuits action that described two once-used emitters are arranged, the action of other 1RF amplifying circuit is stopped, and in described a pair of 2RF amplifying circuit, the 2RF amplifying circuit action that RF signal to the 1RF amplifying circuit output from action is amplified stops the action of other 2RF amplifying circuit

Four signal paths from the supply terminals of described each detector to described each 2RF transmission line form path and equate,

And the line length that consists of a pair of incoming line of described 2RF transmission line is set to, and the reactive component when seeing the 2RF amplifying circuit that is in non-action status from described the 2nd interlinkage becomes zero.

4. satellite signal reception converter as claimed in claim 3 is characterized in that,

Be arranged in the printing cloth line model on the described substrate for forming described converter circuit part, printing cloth line model till from the described a pair of detector that corresponds respectively to described two once-used emitters to described the 2nd interlinkage, the center line that forms with respect to the intermediate point by two once-used emitters becomes the line symmetry.

5. satellite signal reception converter as claimed in claim 3 is characterized in that,

Be provided with for the 2nd of the transmission characteristic of the RF signal that is adjusted at described each the 2nd incoming line at the 2nd interlinkage of described 2RF transmission line and adjust member, so that the reactive component when seeing the 2RF amplifying circuit that is in non-action status from described the 2nd interlinkage becomes zero.

6. satellite signal reception converter as claimed in claim 4 is characterized in that,

Be provided with for the 2nd of the transmission characteristic of the RF signal that is adjusted at described each the 2nd incoming line at the 2nd interlinkage of described 2RF transmission line and adjust member, so that the reactive component when seeing the 2RF amplifying circuit that is in non-action status from described the 2nd interlinkage becomes zero.

7. satellite signal reception converter as claimed in claim 5 is characterized in that,

The described the 2nd adjusts member is made of length-adjustable stub.

8. satellite signal reception converter as claimed in claim 6 is characterized in that,

The described the 2nd adjusts member is made of length-adjustable stub.

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