JP4449794B2 - Frequency converter - Google Patents

Description

  The present invention relates to a frequency conversion device. Specifically, each of the wiring layers provided on both sides of the ground layer via an insulating layer is provided with a probe that receives a radio signal and a conversion processing unit that performs frequency conversion of the signal received by the probe, and the ground layer In this method, an aperture is formed for each satellite at the incident position of radio signals from a plurality of satellites, and a probe is formed in the aperture to receive radio signals transmitted from a plurality of satellites for frequency conversion. Is what you do.

  In a system that receives radio signals transmitted from a plurality of satellites, for example, a satellite broadcast reception system that receives satellite broadcast signals from satellites, a single receiving antenna receives satellite broadcast signals from a plurality of satellites. It has been broken.

  In a satellite broadcasting reception system in Japan, for example, satellite broadcasting signals transmitted from communication satellites (CS) called JCSAT3 and JCSAT4 launched at positions of 128 ° and 124 ° east longitude are received by one receiving antenna. Has been done.

  Here, when receiving satellite broadcast signals transmitted from two satellites, the receiving antenna supplies satellite broadcast signals transmitted from the two satellites to a frequency converter (LNB: Low Noise Block Down Converter), The signal obtained by receiving the satellite broadcast signal is amplified with low noise, then converted to an intermediate frequency signal and supplied to a tuner or the like.

  FIG. 7 shows a circuit configuration of a conventional frequency converter. The RF amplifying unit 81 of the frequency conversion device 80 receives, for example, horizontal polarization signals and vertical polarization signals transmitted from the JCSAT 3 and horizontal polarization signals and vertical polarization signals transmitted from the JCSAT 4. Any one of the above signals is amplified with low noise and supplied to a band pass filter (BPF) 82.

  The RF amplification unit 81 is a signal supplied from LNAs 811 and 812 and amplifiers (LNA: Low Noise Amplifier) 811 to 814 that perform low noise amplification of the signal obtained by receiving the polarization signal for each polarization signal. LNA 815 that amplifies the signal with low noise and supplies it to BPF 82, and LNA 816 that amplifies the signal supplied from LNA 813 and 814 with low noise and supplies it to BPF 82. Here, the LNA 811 performs, for example, low-noise amplification of a signal obtained by receiving a horizontally polarized signal transmitted from the first satellite. In addition, the LNA 812 performs low-noise amplification of a signal obtained by receiving a vertically polarized signal transmitted from the first satellite, for example. For example, the LNA 813 performs low-noise amplification of a signal obtained by receiving a horizontally polarized signal transmitted from the second satellite. For example, the LNA 814 performs low-noise amplification of a signal obtained by receiving a vertically polarized signal transmitted from the second satellite. Power supply to the LANs 811 to 816 is controlled by a power supply control circuit 90 described later so that a signal obtained by receiving a desired polarization signal is amplified with low noise and supplied to the BPF 82.

  The BPF 82 removes the image of the signal supplied from the LAN 815 or the LNA 816 and supplies the signal after the image removal to the mixer 83. The mixer 83 is supplied with a local oscillation signal (for example, 11.2 GHz) from a local oscillator 84. The local oscillation signal is mixed with the signal supplied from the BPF 82 to generate an intermediate frequency (IF) signal SIF. Is generated. The IF signal SIF is amplified by an intermediate frequency amplifier (IF amplifier) 85 and then output as an IF output signal SIFout from an IF signal terminal 87 via a capacitor 86 for cutting low frequency components.

  A signal detection circuit 89 is connected to the IF signal terminal 87 via a capacitor 88 for cutting low frequency components. Further, a power supply control circuit 90 is connected to the IF signal terminal 87.

  The tuner connected to the IF signal terminal 87 supplies power to the frequency converter 80 via the IF signal terminal 87. Further, the tuner controls which polarization signal the IF output signal output from the IF signal terminal 87 is generated based on. For example, the vertical polarization signal or the horizontal polarization signal is selected by switching the voltage level when power is supplied to the frequency converter 80. In addition, the low frequency pulse signal is selectively superimposed when power is supplied, and the satellite is selected depending on whether the low frequency pulse signal is superimposed.

  The signal detection circuit 89 determines whether or not the above-described low frequency pulse signal is supplied from the tuner connected to the IF signal terminal 87, and supplies a determination signal CP indicating the determination result to the power supply control circuit 90. To do.

  The power supply control circuit 90 controls power supply to the LNAs 811 to 816 of the RF amplifier 81 based on the voltage level when power is supplied from the tuner and the determination signal CP supplied from the signal detection circuit 89. The power supply control circuit 90 also supplies power to other parts of the frequency converter 80.

  With this configuration, when one of the two satellites is selected by the tuner and one of the two types of polarization signals transmitted from the selected satellite is further selected, the selected polarization signal is received. The obtained signal is amplified with low noise, the image signal is removed by the BPF 82, and then supplied to the mixer 83. The mixer 83 mixes the local oscillation signal with the signal output from the BPF 82 to generate an IF signal SIF. The IF signal SIF is amplified by the IF amplifier 85, and after the low frequency component is cut by the capacitor 86, it is output from the IF signal terminal 87 as the IF output signal SIFout. Therefore, the IF output signal SIFout based on the desired polarization signal from the satellite selected on the tuner side can be output from the frequency converter 80.

  Further, as in the invention of Patent Document 1, if each polarization signal is received to generate an IF signal and a plurality of IF signals are selected and output, a plurality of tuners are connected to the frequency converter 80. This makes it possible to simultaneously receive broadcast programs with different satellites and polarization systems.

JP 2001-168751 A

  By the way, in the conventional frequency converter 80, it is common practice to place a circuit element such as an amplifier by performing pattern layout on the wiring layer on the front surface using the back surface of the substrate as a ground layer. For this reason, when receiving satellite broadcast signals from two satellites, the board area becomes large and the frequency converter cannot be miniaturized.

  In addition, when receiving a plurality of satellite broadcast signals and outputting a plurality of systems of IF signals, if a pattern layout is performed only on the wiring layer on the front surface, a plurality of systems of IF signals may be output unless the signal paths intersect. There are cases where it cannot be done. In such a case, coupling of high-frequency signals occurs at the intersections of the signal paths, and the respective high-frequency signals adversely affect each other.

  Therefore, the present invention provides a frequency conversion device that can be miniaturized and can satisfactorily output a plurality of systems of signals after frequency conversion.

  The frequency conversion device according to the present invention includes a probe for receiving a radio signal and a conversion process for performing frequency conversion of a signal received by the probe on each of wiring layers provided on both sides of the ground layer via insulating layers. In the ground layer, an opening is formed for each satellite at an incident position of radio signals from a plurality of satellites, and a probe is formed in the opening.

  In the present invention, for example, a plurality of polarization-type satellite broadcast signals respectively transmitted from a plurality of satellites are received. Here, in the opening provided at the incident position of the satellite broadcast signal from the satellite, the satellite broadcast signal of one polarization system is received by the probe provided on one surface and provided on the other surface. The probe receives the other polarization type satellite broadcast signal.

  In addition, the frequency conversion device according to the present invention includes an output control unit that selects signals obtained by the conversion processing units provided on both sides of the ground layer and outputs a plurality of systems. That is, when receiving a plurality of polarization-type satellite broadcast signals respectively transmitted from a plurality of satellites, intermediate frequency signals based on a plurality of desired satellite broadcast signals are independently output.

  According to the present invention, an opening is formed for each satellite at the incident position of radio signals from a plurality of satellites in the ground layer, and radio signals are received by the wiring layers on both sides of the ground layer. A probe and a conversion processing unit are formed, and the probe is formed at the position of the opening. For this reason, the frequency converter which receives the radio signal from a some satellite and performs frequency conversion can be reduced in size. In addition, since the conversion processing units are provided on both sides of the ground layer, isolation can be easily ensured, and a plurality of systems of signals after frequency conversion can be output favorably.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a satellite broadcast receiving antenna 10 used in a system for receiving radio signals transmitted from a plurality of satellites, for example, a satellite broadcast receiving system for receiving satellite broadcast signals transmitted from two communication satellites as described above. Show.

  The satellite broadcast receiving antenna 10 is provided at a reflecting mirror 11 that reflects satellite broadcast signals from two satellites, and at the focal position of the reflecting mirror 11, and after amplifying the satellite broadcast signal with low noise, the frequency is reduced to a signal in a low frequency band. A frequency conversion device 20 for conversion is included.

  FIG. 2 shows the appearance of the frequency converter 20, FIG. 2A is a front view, and FIG. 2B is a side view. FIG. 3 is a schematic sectional view taken along line I-I ′ in FIG. 2A. The frequency conversion device 20 is integrally configured by fitting a housing cover 22 to a substantially rectangular parallelepiped housing 21. A waveguide 210 is formed on the front surface of the housing 21, and the waveguide 210 has circular opening holes 211 and 212. In addition, the frequency converter 20 is provided with connection terminals 23 and 24 using F-type plugs or the like so that a tuner or the like can be connected.

  Inside the frequency converter 20 is provided a converter board 30 on which a circuit for converting a satellite broadcast signal into an intermediate frequency signal is formed. A convex portion 213 is formed at a position corresponding to the ground pattern formed on the wiring layer on the casing side of the converter substrate 30 in the casing portion positioned on the front side of the converter substrate 30. A substrate cover 26 is provided on the rear surface side of the converter substrate 30, and the substrate cover 26 has a convex portion at a position corresponding to the ground pattern formed on the wiring layer on the substrate cover side of the converter substrate 30. 261 is formed. For this reason, if the casing 21 and the substrate cover 26 are formed by metal processing, a desired region on the substrate can be shielded by attaching the substrate cover 26 to the casing 21 with the converter substrate 30 held therebetween. . The substrate cover 26 is provided with a metal frequency adjusting screw 27. By adjusting the frequency adjusting screw 27, a local oscillation signal output from a local oscillator described later can be set to a desired frequency. It is made like that.

  FIG. 4 shows a circuit block configuration of the converter board 30. In FIG. 4, a circuit provided on the housing side surface (hereinafter referred to as “A surface”) of converter substrate 30 and a circuit provided on the substrate cover side surface of converter substrate 30 (hereinafter referred to as “B surface”). Are shown separately.

  Probes 41a-v provided for receiving the first polarization signal (for example, vertical polarization signal) transmitted from the first satellite are low noise amplifiers (LNA) of the conversion processing unit 43a. 431a-v. The LNA 431a-v is cascade-connected to the LNA 432a-v, and the signal Sa-1v obtained by receiving the polarization signal with the probe 41a-v is amplified with low noise by the LNA 431a-v and 432a-v to be a band pass filter. (BPF: Band Pass Filter) 433a-v.

  The BPF 433a-v performs image removal of the signal supplied from the LNA 432a-v, and supplies the signal after image removal to the mixer 434a-v. A local oscillation signal SLO is supplied to the mixers 434a-v from a local oscillator 435 provided on the B surface via an amplifier 436 provided on the A surface. The mixer 434a-v mixes the local oscillation signal SLO with the signal supplied from the BPF 433a-v to generate an intermediate frequency (IF) signal SIF-1v. This IF signal SIF-1v is supplied to the IF amplifiers 451a-v1 and IF amplifiers 451a-v2 of the output control unit 45. The IF amplifier 451a-v1 amplifies the IF signal SIF-1v and supplies it to the output amplifier 50a. The IF amplifier 451a-v2 amplifies the IF signal SIF-1v and supplies it to the output amplifier 50b on the B side.

  Probes 42a-h provided to receive a second polarization signal (for example, a horizontal polarization signal) transmitted from the second satellite are connected to the LNA 431a-h of the conversion processing unit 43a. The LNA 431a-h is cascade-connected to the LNA 432a-h, and the signal Sa-2h obtained by receiving the polarization signal with the probe 42a-h is amplified with low noise by the LNA 431a-h and 432a-h, and then the BPF 433a-h. To be supplied.

  The BPF 433a-h performs image removal of the signal supplied from the LNA 432a-h, and supplies the signal after image removal to the mixer 434a-h. The local oscillation signal SLO is supplied from the amplifier 436 to the mixers 434a-h. The mixer 434a-h mixes the local oscillation signal SLO with the signal supplied from the BPF 433a-h to generate an IF signal SIF-2h. This IF signal SIF-2h is supplied to IF amplifiers 451a-h1 and IF amplifiers 451a-h2. The IF amplifier 451a-h1 amplifies the IF signal SIF-2h and supplies it to the output amplifier 50a. The IF amplifier 451a-h2 amplifies the IF signal SIF-2h and supplies it to the output amplifier 50b.

  Similarly, a probe 41b-h provided to receive a second polarization signal (for example, a horizontal polarization signal) transmitted from the first satellite is connected to the LNA 431b-h of the conversion processing unit 43b. . The LNA 431b-h is cascade-connected to the LNA 432b-h, and the signal Sb-1h obtained by receiving the polarization signal with the probe 41b-h is amplified with low noise by the LNA 431b-h and 432b-h to obtain the BPF 433b-h. To be supplied.

  The BPF 433b-h performs image removal of the signal supplied from the LNA 432b-h, and supplies the signal after image removal to the mixer 434b-h. A local oscillation signal SLO is supplied from the local oscillator 435 to the mixer 434b-h. The mixer 434b-h mixes the local oscillation signal SLO with the signal supplied from the BPF 433b-h to generate an IF signal SIF-1h. The IF signal SIF-1h is supplied to the IF amplifier 451b-h1 and the IF amplifier 451b-h2. The IF amplifier 451b-h1 amplifies the IF signal SIF-1h and supplies it to the output amplifier 50a. The IF amplifier 451b-h2 amplifies the IF signal SIF-1h and supplies it to the output amplifier 50b on the B side.

  A probe 42b-v provided for receiving a first polarization signal (for example, a vertical polarization signal) transmitted from the second satellite is connected to the LNA 431b-v of the conversion processing unit 43b. The LNA 431b-v is cascaded with the LNA 432b-v, and the signal Sb-2v obtained by receiving the polarization signal with the probe 42b-v is amplified with low noise by the LNA 431b-v and 432b-v, and the BPF 433b-v To be supplied.

  The BPF 433b-v performs image removal of the signal supplied from the LNA 432b-v, and supplies the signal after image removal to the mixer 434b-v. A local oscillation signal SLO is supplied from the local oscillator 435 to the mixer 434b-v. The mixer 434b-v mixes the local oscillation signal SLO with the signal supplied from the BPF 433b-v to generate an IF signal SIF-2v. This IF signal SIF-2v is supplied to the IF amplifier 451b-v1 and the IF amplifier 451b-v2. The IF amplifier 451b-v1 amplifies the IF signal SIF-2v and supplies it to the output amplifier 50a. The IF amplifier 451b-v2 amplifies the IF signal SIF-2v and supplies it to the output amplifier 50b.

  The output amplifier 50a amplifies the IF signals supplied from the IF amplifiers 451a-v1, 451a-h1, 451b-v1, and 451b-h1, and outputs the IF signal from the IF signal terminal 53 via the low-frequency component cut capacitor 51a. Output as output signal SIFout1. The output amplifier 50b amplifies the IF signals supplied from the IF amplifiers 451a-v2, 451a-h2, 451b-v2, and 451b-h2, and passes through the IF signal terminal 54 via the capacitor 51b for cutting low frequency components. To IF output signal SIFout2.

  Here, when the converter board 30 is provided in the housing 21, the connection terminal 23 described above is connected to the IF signal terminal 53. Therefore, the IF output signal SIFout2 can be supplied to the tuner connected to the connection terminal 23.

  The tuner includes a first polarization signal and a second polarization signal transmitted from the first satellite, and a first polarization signal and a second polarization signal transmitted from the second satellite. The control function of outputting the IF output signal generated based on any one of the polarization signals from the connection terminal 23 is provided. For example, the tuner selects a vertical polarization signal or a horizontal polarization signal by switching a voltage level when power is supplied to the frequency converter 20. Further, when the power is supplied, the low frequency pulse signal is selectively superimposed. When the low frequency pulse signal is superimposed, the first satellite is selected. When the low frequency pulse signal is not superimposed, the second satellite is selected. Let them choose.

  For this reason, the signal detection circuit 453a of the output control unit 45 is connected to the IF signal terminal 53 via the capacitor 452a for cutting low frequency components, and the above-mentioned low frequency pulse signal is received from the tuner connected to the connection terminal 23. Whether the signal is supplied is determined by the signal detection circuit 453a, and a determination signal CPa indicating the determination result is supplied to the power supply control circuit 454a.

  The power supply control circuit 454a is connected to the IF signal terminal 53, and the voltage level when power is supplied from the tuner connected to the connection terminal 23, and the discrimination signal CPa supplied from the signal detection circuit 453a. Based on this, the power supply to the IF amplifiers 451a-v1, 451a-h1, 451b-v1, 451b-h1 is controlled, and the first polarization signal, the second polarization signal, and the first polarization signal transmitted from the first satellite are controlled. An IF signal generated based on one of the first polarization signal and the second polarization signal transmitted from the two satellites is supplied to the output amplifier 50a.

  Further, when the converter board 30 is provided in the housing 21, the connection terminal 24 described above is connected to the IF signal terminal 54. Therefore, the IF output signal SIFout2 can be supplied to the tuner connected to the connection terminal 24.

  Similarly to the tuner connected to the connection terminal 23, the tuner connected to the connection terminal 24 also transmits from the first polarization signal, the second polarization signal, and the second satellite transmitted from the first satellite. It has a control function to output from the connection terminal 24 an IF signal generated based on any one of the first polarization signal and the second polarization signal.

  For this reason, the signal detection circuit 453b of the output control unit 45 is connected to the IF signal terminal 54 via the capacitor 452b for cutting low frequency components, and the above-mentioned low frequency pulse signal is received from the tuner connected to the connection terminal 24. Whether the signal is supplied is determined by the signal detection circuit 453b, and a determination signal CPb indicating the determination result is supplied to the power supply control circuit 454b.

  The power supply control circuit 454b is connected to the IF signal terminal 54, and the voltage level when power is supplied from the tuner connected to the connection terminal 24 and the discrimination signal CPb supplied from the signal detection circuit 453b. Based on this, the power supply to the IF amplifiers 451a-v2, 451a-h2, 451b-v2, 451b-h2 is controlled, and the first polarization signal, the second polarization signal, and the second polarization signal transmitted from the first satellite are controlled. An IF signal generated based on one of the first polarization signal and the second polarization signal transmitted from the two satellites is supplied to the output amplifier 50b.

  In this way, the power supply control circuits 454a and 454b control the power supply to the IF amplifying unit, so that the IF based on the desired polarization signal from the satellite selected on the tuner side connected to the connection terminals 23 and 24 is obtained. The output signals SIFout1 and SIFout2 can be output independently from the connection terminals 23 and 24 of the frequency converter 20. The power supply control circuits 454a and 454b supply power to other than the IF amplifier.

  FIG. 5 shows an exploded perspective view of the converter board 30. The converter substrate 30 is configured by using a multilayer substrate. A wiring layer 33a is provided on one surface of the ground layer 31 via an insulating layer 32a, and wiring is provided on the other surface via an insulating layer 32b. A layer 33b is provided. On the wiring layer 33a, a conductor pattern for constituting the circuit on the A side in FIG. 4 is formed, and an element such as an amplifier is placed thereon. In addition, a conductor pattern for configuring the circuit on the B surface side in FIG. 4 is formed on the wiring layer 33b, and an element such as an amplifier is placed thereon.

  FIG. 6 is a schematic diagram of a pattern layout in the converter substrate 30. 6A is a view of the pattern layout of the wiring layer 33a as viewed from the component placement side, FIG. 6B is a pattern of the ground layer, and FIG. 6C is a view of the pattern layout of the wiring layer 33b as viewed from the component placement side. . In FIG. 6A and FIG. 6C, the pattern layout for the portions relating to the signal detection circuits 453a and 453b and the power supply control circuits 454a and 454b is omitted, and the signal detection circuits 453a and 453b and the power supply control circuits 454a and 454b are omitted. The placement positions are shown as regions 457a and 457b indicated by alternate long and short dash lines. In FIG. 6, a pattern used as a ground pattern is indicated by straight single hatching, and elements such as amplifiers are indicated by straight cross hatching. In FIG. 6, screw holes 35 for fixing the converter substrate 30 and the substrate cover 26 to the housing 21 are also illustrated.

  Here, the circuit on the A side and the circuit on the B side in FIG. 4 are the same except for the local oscillator 435, the amplifier 436, and the IF signal terminals 53 and 54. Therefore, the pattern layout of the wiring layer 33a shown in FIG. 6A and the pattern layout of the wiring layer 33b shown in FIG. 6C are shared. Further, an amplifier 436 is placed on the wiring layer 33a side, a local oscillator 435 is placed on the wiring layer 33b side, and IF signal terminals 53 and 54 are provided on the wiring layer 33b side.

  In the converter board 30, the frequency adjustment screw 27 shown in FIG. 3 allows the oscillation frequency of the local oscillator 435 to be adjusted. Therefore, the wiring layer 33 a on which the A-side circuit is provided is on the housing side, and the B-side circuit is The wiring layer 33b provided is attached to the housing 21 so as to be on the substrate cover side.

  The ground layer 31 has an opening 311 at a position facing the opening hole 211 of the waveguide 210 and an opening at a position facing the opening hole 212 of the waveguide 210 so that a satellite broadcast signal can be received even on the B-side. Each part 312 is formed. Further, as will be described later, when an electrical conduction hole (hereinafter referred to as “via”) such as a through hole or a via is provided to electrically connect the pattern of the wiring layer 33a and the pattern of the wiring layer 33b, this via is grounded. A via opening 313 is provided at the position of the via so as not to occur.

  In the wiring layer 33a, a pattern of probes 41a-v for receiving a vertically polarized signal transmitted from the first satellite is formed in an area corresponding to the opening hole 211 of the housing 21, for example. In the region corresponding to the opening hole 212, a polarization signal from a second satellite having a polarization method different from that of the signal received by the probe 41a-v, that is, a horizontal polarization signal transmitted from the second satellite is displayed. A pattern of the receiving probes 42a-h is formed.

  An LNA 431a-v is connected to the probe 41a-v. The LNA 431a-v is connected to the LNA 432a-v using a microstrip line coupling line. A mixer 434a-v is connected to the LNA 432a-v via a BPF 433a-v configured by a microstrip line. An amplifier 436 for supplying a local oscillation signal SLO is connected to the mixers 434a-v. Furthermore, the mixers 434a-v are connected to IF amplifiers 451a-v1, 451a-v2 that amplify the IF signal SIF-1v generated by the mixer 434a-v. A power supply control circuit (not shown) for supplying power is connected to the IF amplifiers 451a-v1 and 451a-v2.

  LNAs 431a-h are connected to the probes 42a-h. The LNA 431a-h is connected to the LNA 432a-h using a microstrip line coupling line. A mixer 434a-h is connected to the LNA 432a-h via a BPF 433a-h configured by a microstrip line. An amplifier 436 is connected to the mixers 434a-v. Furthermore, the mixers 434a-h are connected to IF amplifiers 451a-h1, 451a-h2 that amplify the IF signal SIF-2h generated by the mixer 434a-h.

  The IF amplifiers 451a-v1 and 451a-h1 are connected to the output amplifier 50a. The IF amplifiers 451a-v2 and 451a-h2 are connected to an output amplifier 50b provided on the wiring layer 33b side via vias (not shown). As will be described later, IF amplifiers 451b-v1, 451b-h1 are also connected to the output amplifier 50a through vias. The output amplifier 50a is connected to an IF signal terminal 53 provided on the wiring layer 33b side through a capacitor 51a and a via (not shown).

  In the wiring layer 33b, in a region corresponding to the opening hole 211 of the casing 21, a different polarization signal from the satellite that transmits the polarization signal received by the probe 41a-v, that is, the first satellite is transmitted. A pattern of the probe 41b-h that receives the horizontally polarized signal is formed. Also, in the region corresponding to the aperture hole 212, a different polarization signal from the satellite that transmits the polarization signal received by the probes 42a-h, that is, a vertical polarization signal transmitted from the second satellite is received. A pattern of the probes 42b-v is formed.

  The LNA 431b-h is connected to the probe 41b-h. The LNA 432b-h is connected to the LNA 431b-h using a microstrip line coupling line. A mixer 434b-h is connected to the LNA 432b-h via a BPF 433b-h configured by a microstrip line. A local oscillator 435 for supplying a local oscillation signal SLO is connected to the mixer 434b-h. Furthermore, the mixer 434b-h is connected to IF amplifiers 451b-h1 and 451b-h2 that amplify the IF signal SIF-1h generated by the mixer 434b-h. A power supply control circuit (not shown) for supplying power is connected to the IF amplifiers 451b-h1 and 451b-h2.

  The LNA 431b-v is connected to the probe 42b-v. An LNA 432b-v is connected to the LNA 431b-v using a microstrip line coupling line. A mixer 434b-v is connected to the LNA 432b-v via a BPF 433b-v configured by a microstrip line. A local oscillator 435 is connected to the mixer 434b-h. Furthermore, the mixer 434b-v is connected to IF amplifiers 451b-v1 and 451b-v2 that amplify the IF signal SIF-2v generated by the mixer 434b-v.

  The IF amplifiers 451b-h1 and 451b-v1 are connected to an output amplifier 50a provided on the wiring layer 33a side via vias (not shown). The IF amplifiers 451b-h2 and 451b-v2 are connected to the output amplifier 50b. As described above, IF amplifiers 451a-v2, 451a-h2 are also connected to the output amplifier 50b via vias (not shown). The output amplifier 50b is connected to the IF signal terminal 54 via the capacitor 51b.

  In the region 457a of the wiring layer 33a, a signal detection circuit 453a and a power supply control circuit 454a are provided, and a voltage level and a low-frequency pulse signal when power is supplied from a tuner connected to the connection terminal 23 are superimposed. The power supply to the IF amplifiers 451a-v1, 451a-h1, 451b-v1, 451b-h1 is controlled according to whether or not the power is supplied.

  Similarly, a signal detection circuit 453b and a power supply control circuit 454b are provided in the region 457b of the wiring layer 33b, and the voltage level when the power is supplied from the tuner connected to the connection terminal 24 and the low frequency pulse signal. The power supply to the IF amplifiers 451a-v2, 451a-h2, 451b-v2, 451b-h2 is controlled in accordance with whether or not.

  Thus, when the converter substrate 30 is configured, the A-side circuit shown in FIG. 4 is formed on one surface of the ground layer, and the B-side circuit is formed on the other surface. Compared with the case where the A-side circuit and the B-side circuit are provided on the surface, the substrate size is reduced. Therefore, when a plurality of tuners are connected to the frequency conversion device 20 and IF output signals output from the frequency conversion device 20 can be independently selected by each tuner, the frequency conversion device can be downsized.

  Further, when the circuit on the A side and the circuit on the B side are provided on the surface of the substrate, the IF signal output from the IF amplifiers 53 and 54 cannot be output unless the IF signals output from the IF amplifier are crossed. IF signal isolation deteriorates. However, since the circuit on the A side is formed on one side of the ground layer and the circuit on the B side is formed on the other side, an IF signal is transmitted from one side to the other side via the via. Since it is not necessary to cross IF signals on the same plane, isolation can be easily secured. That is, the IF output signal output from the frequency conversion device 20 can be a signal with good characteristics.

  Further, as shown in FIG. 6, since the pattern layout of the wiring layer 33a and the wiring layer 33b is made common, compared to the case where the pattern layout of the wiring layer 33a and the pattern layout of the wiring layer 33b are individually designed, Design time can be shortened. In addition, it is easy to change the design.

  As described above, the frequency conversion device according to the present invention is applied to receive satellite broadcast signals transmitted from a plurality of broadcast satellites and output a plurality of intermediate frequency signals.

It is a figure which shows the external appearance of a satellite broadcast receiving antenna. It is a figure which shows the structure of a frequency converter. It is the cross-sectional schematic diagram in the I-I 'line position. It is a figure which shows the circuit block structure of a converter board | substrate. It is a disassembled perspective view of a converter board. It is the schematic of the pattern layout of a converter board | substrate. It is a figure which shows the circuit block structure of the conventional frequency converter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Satellite broadcast receiving antenna, 11 ... Reflector, 20, 80 ... Frequency converter, 21 ... Housing, 22 ... Housing cover, 23, 24 ... Connection terminal, 26 ... Board cover, 27 ... Frequency adjusting screw, 30 ... Converter board, 31 ... Ground layer, 32a, 32b ... Insulating layer, 33a, 33b ... Wiring layer, 35 ... Screw holes, 41a-h, 41b-v, 42a-v, 42b-h ... probes, 43a, 43b ... conversion processing units, 45 ... output control units, 50a, 50b ... output amplifiers , 53, 54, 87... IF signal terminal, 81... RF amplifier, 82, 433a-h, 433a-v, 433b-h, 433b-v .. band pass filter (BPF), 83, 434a -h, 434a-v, 434b-h, 434b-v ..mixer, 84, 435 ... local oscillator, 85,451 a-h1, 451a-h2, 451a-v1, 451a-v2, 451b-h1, 451b-h2, 451b-v1, 451b-v2... intermediate frequency amplifier (IF amplifier), 89, 453a, 453b. Signal detection circuit, 90, 454a, 454b ... power supply control circuit, 210 ... waveguide, 211, 212 ... opening hole, 311, 312 ... opening, 313 ... opening for via 431a-h, 431a-v, 431b-h, 431a-h, 432a-h, 432a-v, 432b-h, 432b-v, 811 to 816 ... low noise amplifier (LNA), 436,. ·amplifier

Claims (2)

On each of the wiring layers provided on both sides of the ground layer via an insulating layer, a probe that receives a radio signal and a conversion processing unit that performs frequency conversion of the signal received by the probe are formed.
In the ground layer, an opening is formed for each satellite at an incident position of the radio signal from a plurality of satellites,
The probe is formed in the opening ;
The pattern layout of each wiring layer is shared so that the probes formed in the respective wiring layers overlap,
In the opening, the probe on one surface side and the probe on the other surface side receive radio signals of different polarization systems,
In each of the wiring layers, the probe formed in one of the openings and the probe formed in the other opening receive radio signals of different polarization methods. A frequency converter. 2. The frequency converter according to claim 1, further comprising an output control unit that selects a signal obtained by the conversion processing unit provided in each of the wiring layers and outputs a plurality of systems.

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