JP2021016068A - Satellite antenna and satellite broadcast reception system - Google Patents

Abstract

To provide a technology capable of suppressing noise generation at a satellite antenna.SOLUTION: A satellite antenna 1 includes a reflector 11, a primary radiator 12 and an output section 15. The reflector 11 reflects a satellite broadcast wave. The primary radiator 12 is disposed at a focal position of the reflector 11. The output section 15 is connected with a transmission line 30 for transmitting an output signal from the primary radiator 12. Namely, a signal received by the satellite antenna 1 is transmitted to the transmission line 30 without being frequency-converted by the satellite antenna 1.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a technique for frequency-converting received signals of broadcast radio waves having overlapping frequency bands and different polarization methods into intermediate frequency signals having different frequency bands.

Patent Document 1 describes a satellite antenna that receives a satellite broadcast wave, converts the received signal into an intermediate frequency band IF signal by a low noise block converter (LNB), and outputs this IF signal to a transmission line. ..

JP-A-2018-33065

However, a satellite antenna having an LNB includes an oscillator that is a source of a local signal used when frequency-converting a received signal into an IF signal, and this oscillator becomes a source of noise (for example, phase noise). Therefore, there is a problem that the carrier-to-noise ratio (hereinafter, C / N) of the IF signal is deteriorated.

Further, in the frequency converter, not only the frequency component of the difference between the local signal and the received signal but also the frequency component of the difference between the harmonic of the local signal and the received signal is generated. For example, in the right-handed signal, the right-handed signal received at 11.7 GHz to 12.75 GHz is converted into an IF signal of 1022 MHz to 2072 MHz using a local signal of 10.678 GHz. At this time, the 8.606 GHz to 9.656 GHz signal (hereinafter, image signal) included in the received signal is also converted into the same frequency band as the IF signal by the harmonic having twice the frequency of the local signal, and the IF signal Deteriorate C / N. Further, when an interfering wave jumps into the band of this image signal, the C / N of the IF signal is deteriorated. For this reason, in the conventional apparatus, it is essential to provide a filter for removing the image signal from the received signal on the input side of the frequency converter.

In particular, a satellite antenna for both right and left rotation that receives both a right-handed signal and a left-handed signal requires a local signal for a right-handed signal and a local signal for a left-handed signal. The frequency difference between the two local signals is 1173 MHz, and the noise generated by mixing the two signals also occurs in the frequency band used in the IF signal. As a result, this noise also deteriorates the C / N of the IF signal.

An object of the present disclosure is to provide a technique for suppressing the generation of noise in a satellite antenna.

One aspect of the present disclosure is a satellite antenna, comprising a reflector, a primary radiator, and an output unit. The reflector reflects satellite broadcast waves. The primary radiator is located at the focal point of the reflector. A transmission line for transmitting an output signal from the primary radiator is connected to the output unit.

According to such a configuration, the signal received by the satellite antenna is transmitted to the transmission line without frequency conversion by the satellite antenna, so that the satellite antenna does not need to be provided with a source of the local signal. As a result, it is possible to suppress the generation of various noises based on the local signal, and it is possible to suppress the deterioration of the C / N of the signal transmitted on the transmission line.

One aspect of the present disclosure may further include an optical conversion unit that converts an output signal from the primary radiator into an optical signal. An optical cable may be connected to the output unit as a transmission line.
According to such a configuration, noise is not picked up during transmission on the transmission line, so that deterioration of the C / N of the signal transmitted on the transmission line can be further suppressed. In addition, noise leakage from the transmission line to the outside can be suppressed. Further, the transmission distance can be extended as compared with the case of using an electric cable.

One aspect of the present disclosure is a satellite antenna, comprising a reflector, a primary radiator, a polarization separator, and an output unit. The reflector reflects satellite broadcast waves. The primary radiator is located at the focal point of the reflector. The polarization separator separates the received signal received by the primary radiator into a right-handed signal and a left-handed signal. A transmission line for transmitting a right-handed signal and a left-handed signal separated by a polarization separator is connected to the output unit.

According to such a configuration, both the right-handed signal and the left-handed signal received by the satellite antenna are transmitted to the transmission line without frequency conversion by the satellite antenna, so that the local signal can be transmitted to the satellite antenna. There is no need to have a source. As a result, it is possible to suppress the generation of various noises based on the local signal, and it is possible to suppress the deterioration of the C / N of the signal transmitted on the transmission line.

In one aspect of the present disclosure, the output unit may be configured as a transmission line so that at least two electric cables that individually transmit a right-handed signal and a left-handed signal are connected.
According to such a configuration, since the right-handed signal and the left-handed signal are transmitted as electric signals, the device configuration of the satellite antenna can be simplified.

One aspect of the present disclosure may further include an optical conversion unit that converts a right-handed signal and a left-handed signal into optical signals, respectively. The output unit may be configured as a transmission line so that at least two optical cables that individually transmit two optical signals converted by the optical conversion unit are connected.

According to such a configuration, noise is not picked up during transmission on the transmission line, so that deterioration of the C / N of the signal transmitted on the transmission line can be further suppressed. In addition, noise leakage from the transmission line to the outside can be suppressed. Further, the transmission distance can be extended as compared with the case of using an electric cable.

One aspect of the present disclosure may further include an optical converter and a combiner. The optical conversion unit converts the right-handed signal and the left-handed signal into optical signals, respectively. The combiner combines two optical signals converted by the optical conversion unit. The output unit may be configured as a transmission line so that at least one optical cable for transmitting an optical signal combined with a combiner is connected.

According to such a configuration, a transmission line having a simple structure can be used.
One aspect of the present disclosure is a satellite antenna, which includes a reflector, a primary radiator, a polarization separator, a frequency converter, and an output unit. The reflector reflects satellite broadcast waves. The primary radiator is located at the focal point of the reflector. The polarization separator separates the received signal received by the primary radiator into a right-handed signal and a left-handed signal. The frequency converter generates an IF signal by frequency-converting the conversion target signal with one of the right-handed signal and the left-handed signal separated by the polarization separator as the non-conversion signal and the other as the conversion target signal. To do. A transmission line for transmitting an unconverted signal and an IF signal is connected to the output unit.

According to such a configuration, one of the right-handed signal processing system and the left-handed signal processing system does not need to be provided with a local signal source. Therefore, since noise having the difference frequency of the two local signals as a component is not generated, it is possible to suppress deterioration of the C / N of the signal transmitted via the transmission line. Further, since the image signal is not generated in the processing unit that does not perform frequency conversion, a filter for removing the image signal becomes unnecessary, and the device configuration can be simplified.

In one aspect of the present disclosure, the output unit may be configured such that at least one electric cable for transmitting a signal obtained by combining an unconverted signal and an IF signal is connected as a transmission line.
According to such a configuration, since the non-conversion signal and the IF signal are transmitted as electric signals, the device configuration of the satellite antenna can be simplified.

One aspect of the present disclosure may further include an optical conversion unit. The optical conversion unit converts the non-converted signal into an optical signal. As a transmission line, at least one electric cable for transmitting the IF signal generated by the frequency conversion unit and one optical cable for transmitting the optical signal converted by the optical conversion unit are connected to the output unit. It may be configured as follows.

According to such a configuration, since the non-converted signal having a higher frequency is converted into an optical signal and transmitted, the distance that can be wired by the transmission line can be extended.
One aspect of the present disclosure is a satellite broadcast receiving system, comprising a satellite antenna, a transmission line, and a converter. The satellite antenna receives the satellite broadcast wave and outputs the received signal as an unconverted received signal without frequency-converting the received signal into an IF signal. The transmission line transmits the unconverted received signal output from the satellite antenna. The converter converts the unconverted received signal received via the transmission line into an IF signal in the intermediate frequency band and outputs the signal.

According to such a configuration, the system can be configured by using an existing TV receiver configured on the premise that frequency conversion is performed on the satellite antenna side.
One aspect of the present disclosure is a satellite broadcast receiving system, comprising a satellite antenna, a transmission line, and a converter. The satellite antenna receives two types of satellite broadcast waves with different polarizations, frequency-converts the reception signal of the first polarization into an IF signal and outputs it as a conversion reception signal, and also receives the reception signal of the second polarization. Is output as an unconverted received signal without frequency conversion to an IF signal. The transmission line transmits the converted received signal and the non-converted received signal output from the satellite antenna. The converter converts the unconverted received signal received via the transmission line into an IF signal having a frequency different from that of the converted received signal, and outputs the converted received signal together with the converted received signal.

According to such a configuration, since the converted received signal and the non-converted received signal use different frequency bands, they can be superimposed and transmitted on one transmission line.
In one aspect of the present disclosure, the converter may acquire signals in the frequency bands used in terrestrial digital broadcasting and CATV, mix them with IF signals, and output them.

According to such a configuration, the system can be configured by using a TV receiver which does not have a dedicated input terminal for terrestrial digital broadcasting and has only an input terminal common to satellite broadcasting.
In one aspect of the present disclosure, the satellite antenna may convert the unconverted received signal into an optical signal and output it. The transmission line may include at least an optical cable. The converter may include an O / E converter that converts an optical signal transmitted via an optical cable into an electrical signal.

According to such a configuration, since noise is not picked up during transmission on the transmission line, it is possible to suppress deterioration of the C / N of the unconverted received signal transmitted on the transmission line. In addition, noise leakage from the transmission line to the outside can be suppressed. Further, the transmission distance can be extended as compared with the case of using an electric cable.

In one aspect of the present disclosure, the converter may be built into the TV receiver. The TV receiver may include a satellite connector for connecting a transmission line.
According to such a configuration, since the TV receiver includes an input terminal for inputting a non-converted reception signal, the satellite antenna and the TV receiver can be directly connected by a transmission line, and the system configuration can be simplified. In particular, when the transmission line is composed of an optical cable, the noise resistance can be further improved because all the transmission from the satellite antenna to the TV receiver is performed by an optical signal.

It is a block diagram which shows the structure of the satellite broadcasting reception system of 1st Embodiment. It is explanatory drawing which shows the frequency band of the received signal of satellite broadcasting and the received signal after frequency conversion. It is a block diagram which shows the structure of the satellite broadcasting reception system of 2nd Embodiment. It is a block diagram which shows the structure of the satellite broadcasting reception system of 3rd Embodiment. It is a block diagram which shows the structure of the satellite broadcasting reception system of 4th Embodiment. It is a block diagram which shows the structure of the satellite broadcasting reception system of 5th Embodiment. It is a block diagram which shows the structure of the satellite broadcasting reception system of 6th Embodiment. It is a block diagram which shows the structure of the modification of 6th Embodiment.

The embodiments of the present disclosure will be described below together with the drawings.
[1. First Embodiment]
[1-1. overall structure]
As shown in FIG. 1, the satellite broadcast receiving system 1 includes a satellite antenna 10, a TV receiver 20, and a transmission line 30.

The satellite antenna 10 receives transmission radio waves from broadcasting satellites (BS) and communication satellites (CS), which are artificial satellites launched in substantially the same direction when viewed from the ground.
As shown in FIG. 2, the transmission radio waves from the broadcasting satellite (BS) include a broadcasting radio wave using right-handed circularly polarized waves (BS-R) and a broadcasting radio wave using left-handed circularly polarized waves (BS-L). is there. The frequency band of BS-R is, for example, 11.71 to 12.16 GHz, and the frequency band of BS-L is, for example, about 11.73 to 12.19 GHz. That is, the frequency bands of BS-R and BS-L substantially overlap.

The radio waves transmitted from the communication satellite (CS) include broadcast radio waves (CS-R) that use right-handed circularly polarized waves and broadcast radio waves (CS-L) that use left-handed circularly polarized waves. The frequency band of CS-R is, for example, 12.23 to 12.75 GHz, and the frequency band of CS-L is, for example, 12.21 to 12.73 GHz. That is, the frequency bands of CS-R and CS-L substantially overlap.

BS-R and CS-R are used for 2K or 4K satellite broadcasting, and BS-L and CS-L are used for 4K or 8K satellite broadcasting.
The TV receiver 20 is connected to the satellite antenna 10 via a transmission line 30. The TV receiver 20 is configured so that both 4K or 8K satellite broadcasting and terrestrial digital broadcasting can be viewed.

[1-2. Satellite antenna]
As shown in FIG. 1, the satellite antenna 10 includes a reflector 11, a primary radiator 12, a right-handed rotation processing unit 13, a left-handed rotation processing unit 14, and an output unit 15.

The reflector 11 is a reflector for forming a so-called parabolic antenna having a parabolic reflecting surface that concentrates radio waves in a certain direction.
The primary radiator 12 is configured with a waveguide and is located at the focal position of the reflector 11. The primary radiator 12 has a septum 121 and two probes 12R, 12L. The septum 121 separates the radio wave guided to the waveguide through the reflector 11 into right-handed circularly polarized waves and left-handed circularly polarized waves, and converts them into linearly polarized waves. The probe 12R receives right-handed circularly polarized broadcast radio waves (BS-R, CS-R) converted into linearly polarized waves by the septum 121. The probe 12L receives left-handed circularly polarized broadcast radio waves (BS-L, CS-L) converted into linearly polarized waves by the septum 121.

In the right-handed rotation processing unit 13, the input terminal is connected to the probe 12R, and the output terminal is connected to the output unit 15. The right-handed rotation processing unit 13 includes an amplification unit 131 and a bandpass filter (BPF) 132.

The amplification unit 131 is composed of one or more stages of amplifiers, and amplifies a right-handed reception signal (hereinafter, RF-R) which is a reception signal from the probe 12R. The BPF 132 selectively passes a signal in the frequency band used in RF-R among the output signals from the amplification unit 131 and outputs the signal.

In the left-handed rotation processing unit 14, the input terminal is connected to the probe 12L, and the output terminal is connected to the output unit 15. The left-handed rotation processing unit 14 includes an amplification unit 141 and a BPF 142, similarly to the right-handed rotation processing unit 13.

The amplification unit 141 is composed of one or more stages of amplifiers, and amplifies a left-handed reception signal (hereinafter, RF-L) which is a reception signal from the probe 12L. The BPF 142 selectively passes a signal in the frequency band used in RF-L among the output signals from the amplification unit 131 and outputs the signal.

The right-handed rotation processing unit 13 and the left-handed rotation processing unit 14 are composed of circuit components mounted on a common circuit board, and the circuit board is housed in a housing integrally formed with a waveguide constituting the primary radiator 12. It is stored. The housing is made of a conductive material (for example, aluminum die-cast) similar to that of a waveguide, and functions as a shield member that protects an internal circuit assembled on a circuit board.

The output unit 15 includes two output terminals configured by an F-type coaxial connector to which a coaxial cable is connected. One output terminal (hereinafter, right-handed output terminal) is connected to the right-handed rotation processing unit 13 and outputs RF-R supplied from the right-handed turning processing unit 13. The other output terminal (hereinafter, left-handed output terminal) is connected to the left-handed processing unit 14 and outputs RF-L supplied from the left-handed processing unit 14. The output unit 15 is provided in a housing in which a circuit board that functions as a right-handed rotation processing unit 13 and a left-handed rotation processing unit 14 is housed.

That is, a transmission line 30 including two coaxial cables is connected to the output unit 15. Then, both RF-R and RF-L are transmitted to the TV receiver 20 by different coaxial cables without frequency conversion. A coaxial cable corresponds to an electric cable. RF-R and RF-L correspond to unconverted received signals that have not been frequency-converted.

The power supply to the amplification units 131 and 141 is performed via the transmission line 30. Specifically, the DC component superimposed on any of the coaxial cables that transmit RF-R and RF-L may be separated to supply power. Further, a feeding line different from the above two coaxial cables may be separately provided on the transmission line 30, and power may be supplied by the feeding line.

[1-3. TV receiver]
The TV receiver 20 includes a satellite connector 21, a terrestrial digital connector 22, a converter unit 23, and a main body unit 25. Further, although not shown, the TV receiver 20 includes a power supply circuit for supplying power to the satellite antenna 10 via the transmission line 30.

The satellite connector 21 is formed in the same manner as the output unit 15 of the satellite antenna 10, and includes two input terminals composed of an F-type coaxial connector to which a coaxial cable is connected. One input terminal (hereinafter, right-handed input terminal) is a terminal for inputting RF-R supplied from the satellite antenna 10 via the transmission line 30. The other input terminal (hereinafter, left-handed input terminal) is a terminal for inputting RF-L supplied from the satellite antenna 10 via the transmission line 30.

The terrestrial digital broadcasting connector 22 is connected to an antenna or CATV network that receives terrestrial digital broadcasting waves, and is a terminal for inputting a terrestrial digital broadcasting reception signal (hereinafter, RF-D).
The converter unit 23 includes amplifiers 231 and 232, frequency converters (hereinafter, FCVs) 233 and 234, and BPF 235 and 236.

The amplifier 231 amplifies the RF-R supplied via the right-handed input terminal of the satellite connector 21. The FCV233 includes an oscillator OSC and a mixer MIX. The oscillator OSC produces a right-handed local signal with a preset local frequency (eg, 10.678 GHz). The mixer MIX mixes the RF-R amplified by the amplifier 231 and the right-handed local signal generated by the oscillator OSC, and extracts a component having a difference frequency between the two signals. As a result, the FCV233 generates a right-handed IF signal (hereinafter, IF-R) in the intermediate frequency band (for example, 1032 to 2070 MHz). The BPF 235 selectively extracts a signal in the frequency band used in the IF-R from the output signal from the FCV 233.

The amplifier 232 amplifies RF-L supplied via the left-handed input terminal of the satellite connector 21. The FCV234 is configured in the same manner as the FCV233, and includes an oscillator OSC and a mixer MIX, although not shown. The oscillator OSC produces a left-handed local signal with a preset local frequency (eg, 9.505 GHz). The mixer MIX mixes the RF-L amplified by the amplifier 232 and the left-handed local signal generated by the oscillator OSC, and extracts a component having a difference frequency between the two signals. As a result, the FCV234 generates a left-handed IF signal (hereinafter, IF-L) in the intermediate frequency band (for example, 2224 to 3224 MHz). The BPF 236 selectively extracts a signal in the frequency band used in IF-L from the output signal from the FCV 234.

Then, the converter unit 23 combines IF-R and IF-L and supplies the IF-R and IF-L to the main body unit 25. The IF-R and IF-L do not necessarily have to be combined with each other, and may be supplied to the main body 25 as individual signals.

The main body 25 extracts a signal of a designated desired channel from IF-R and IF-L supplied via the converter 23 and RF-D supplied via the terrestrial digital connector 22. , Has a function to reproduce video and audio.

[1-4. effect]
The satellite broadcast receiving system 1 of the present embodiment described above has the following effects.
(1a) In the satellite broadcast receiving system 1, the signals (RF-R, RF-L) received by the satellite antenna 10 are transmitted to the transmission line 30 without frequency conversion. Therefore, it is not necessary for the right-handed rotation processing unit 13 and the left-handed rotation processing unit 14 of the satellite antenna 10 to be provided with a source of a local signal used for frequency conversion, the generation of phase noise based on the local signal can be suppressed, and the transmission line 30 can be used. It is possible to suppress deterioration of the C / N of the transmitted signal.

(1b) In the satellite broadcast receiving system 1, not only the configuration for generating a local signal on the satellite antenna 10 side is unnecessary, but also the filter for removing the image signal is unnecessary, so that the configuration of the satellite antenna 10 is not required. Can be simplified. The image signal is a signal that is converted into the frequency band of the IF signal by being mixed with a harmonic having a frequency twice that of the local signal, and is a factor that deteriorates the C / N of the IF signal. To say. That is, according to the satellite broadcast reception system 1, since the image signal is not converted into the band used by the transmission signal by the local signal, deterioration of C / N due to the image signal can be suppressed.

(1c) In the satellite broadcast receiving system 1, the TV receiver 20 includes a satellite connector 21 for inputting RF-R and RF-L which are non-conversion received signals. Therefore, the satellite antenna 10 and the TV receiver 20 can be directly connected via the transmission line 30, and the system configuration can be simplified.

(1d) In the generation broadcast reception system 1, since the converter unit 23 exists in the TV receiver 20, the signal level is sufficiently lowered before the noise based on the local signal used in the converter unit 23 reaches the satellite antenna 10. To do. Therefore, it is possible to prevent the noise generated in the converter unit 23 from leaking from the satellite antenna 10.

[2. Second Embodiment]
[2-1. Differences from the first embodiment]
The configuration of the second embodiment is shown in FIG.

Since the basic configuration of the second embodiment is the same as that of the first embodiment, the differences will be described below. The same reference numerals as those in the first embodiment indicate the same configurations, and the preceding description will be referred to.

In the first embodiment described above, a coaxial cable is used as the transmission line 30 between the satellite antenna 10 and the TV receiver 20. On the other hand, the second embodiment differs from the first embodiment in that an optical cable is used as the transmission line 30a.

As shown in FIG. 3, the satellite broadcast receiving system 1a of the second embodiment includes a satellite antenna 10a, a TV receiver 20a, and a transmission line 30a.
[2-2. Satellite antenna]
The satellite antenna 10a includes a reflector 11, a primary radiator 12, a right-handed rotation processing unit 13a, a left-handed rotation processing unit 14a, and an output unit 15a. That is, the satellite antenna 10a is different from the first embodiment in the configurations of the right-handed rotation processing unit 13a, the left-handed rotation processing unit 14a, and the output unit 15a.

The right-handed rotation processing unit 13a includes an amplification unit 131, a BPF 132, and an E / O conversion unit 133. That is, it has a configuration in which the E / O conversion unit 133 is added to the configuration of the right-handed rotation processing unit 13 shown in the first embodiment.

The E / O conversion unit 133 includes a laser diode (LD) and an LD drive circuit. The LD drive circuit supplies a drive current equal to or greater than the threshold current required for causing the LD to emit light, and changes the emission intensity of the LD according to the amplitude of RF-R supplied from the BPF 132. As a result, the E / O conversion unit 133 generates an optical signal (hereinafter, OPT-R) intensity-modulated by RF-R.

The left-handed rotation processing unit 14a includes an amplification unit 141, a BPF 142, and an E / O conversion unit 143. That is, it has a configuration in which the E / O conversion unit 143 is added to the configuration of the left-handed rotation processing unit 14 shown in the first embodiment.

The E / O conversion unit 143 includes an LD and an LD drive circuit, similarly to the E / O conversion unit 133. Then, the E / O conversion unit 143 changes the emission intensity of the LD according to the amplitude of the RF-L supplied from the BPF 133, whereby the intensity-modulated optical signal (hereinafter, OPT-L) by the RF-L is used. To generate.

The output unit 15a is an optical connector to which an optical cable is connected, and includes two output terminals configured by a resector pull to which a plug, which is a connector on the optical cable side, can be connected. The right-handed output terminal, which is one of the output terminals, outputs the OPT-R generated by the right-handed rotation processing unit 13a. The left-handed output terminal, which is the other output terminal, outputs OPT-L generated by the left-handed turning processing unit 14a.

That is, a transmission line 30a including two optical cables is connected to the output unit 15a. Then, the OPT-R and the OPT-L intensity-modulated by RF-R and RF-L are transmitted to the TV receiver 20a by different optical cables. Here, OPT-R and OPT-L correspond to unconverted received signals that have not been frequency-converted.

The power supply to the amplification units 131 and 141 and the E / O conversion units 133 and 143 is performed via the transmission line 30a. Specifically, as the transmission line 30a, an optical cable having a power supply function for transmitting electric power is used. That is, the transmission line 30a may be an optical cable for signal transmission and an electric cable for power supply integrated.

[2-3. TV receiver]
The TV receiver 20a includes a satellite connector 21a, a terrestrial digital connector 22, a converter unit 23a, and a main body unit 25. Although not shown, the TV receiver 20a includes a power supply circuit for supplying power to the satellite antenna 10a via the transmission line 30a.

The satellite connector 21a is configured in the same manner as the output unit 15a of the satellite antenna 10a, and includes two input terminals. The right-handed input terminal, which is one of the input terminals, is a terminal for inputting OPT-R supplied from the satellite antenna 10a via the transmission line 30a. The left-handed input terminal, which is the other input terminal, is a terminal for inputting OPT-L supplied from the satellite antenna 10a via the transmission line 30a.

The converter unit 23a includes O / E conversion units 237, 238, amplifiers 231, 232, FCV 233, 234, and BPF 235, 236. That is, it has a configuration in which O / E conversion units 237 and 238 are added to the converter unit 23 shown in the first embodiment.

The O / E conversion unit 237 is configured by using a photodiode, and reproduces RF-R by converting OPT-R input from the right-handed input terminal of the satellite connector 21a into an electric signal.

Like the O / E conversion unit 237, the O / E conversion unit 238 is configured by using a photodiode, and converts the OPT-L input from the left-handed input terminal of the satellite connector 21a into an electric signal. Regenerate RF-L.

Hereinafter, the processing for RF-R and RF-L in the converter unit 23a is the same as the processing in the converter unit 23 of the first embodiment.
[2-4. effect]
According to the second embodiment described in detail above, the effects (1a) to (1d) of the above-mentioned first embodiment are exhibited, and the following effects are further achieved.

(2a) In the satellite broadcast receiving system 1a, an optical cable is used as a transmission line 30a from the satellite antenna 10a to the TV receiver 20a. Therefore, noise is not picked up during transmission on the transmission line 30a, and OPT-R and OPT-L transmitted on the transmission line 30a, and eventually RF-R and RF-L reproduced from these optical signals. Deterioration of C / N can be suppressed. In addition, noise leakage from the transmission line 30a to the outside can be suppressed. Further, the transmission distance can be extended as compared with the case where an electric cable is used for signal transmission.

(2b) In the satellite broadcast receiving system 1a, an optical cable is used for signal transmission between the converter unit 23a including the FCV 233 and 234 and the satellite antenna 10a. Therefore, it is possible to further suppress that the noise generated due to the local signal used in the FCV 233 and 244 reaches the satellite antenna 10a and leaks from the satellite antenna 10a.

[3. Third Embodiment]
[3-1. Differences from the second embodiment]
The configuration of the third embodiment is shown in FIG.

Since the basic configuration of the third embodiment is the same as that of the second embodiment, the differences will be described below. The same reference numerals as those of the first and second embodiments indicate the same configurations, and the preceding description will be referred to.

In the second embodiment described above, the two optical signals OPT-R and OPT-L are transmitted by using different optical cables. On the other hand, the third embodiment is different from the second embodiment in that transmission is performed by a single optical cable using a wavelength division multiplexing technique.

As shown in FIG. 4, the satellite broadcast receiving system 1b of the third embodiment includes a satellite antenna 10b, a TV receiver 20b, and a transmission line 30b.
[3-2. Satellite antenna]
The satellite antenna 10b includes a reflector 11, a primary radiator 12, a right-handed rotation processing unit 13a, a left-handed rotation processing unit 14a, a combiner 16, and an output unit 15b. That is, the satellite antenna 10b has a configuration in which the output unit 15b is different from that in the second embodiment, and a combiner 16 is added. Further, the E / O conversion units 133 and 143 of the right-handed rotation processing unit 13a and the left-handed rotation processing unit 14a are configured in the same manner as in the second embodiment, but are intensity-modulated using light having different wavelengths. OPT-R and OPT-L are generated.

The combiner 16 combines the OPT-R and OPT-L with different wavelengths generated by the right-handed rotation processing unit 13a and the left-handed rotation processing unit 14a into wavelength-multiplexed optical signals and supplies them to the output unit 15b. To do.

The output unit 15b is an optical connector to which an optical cable is connected, and includes one output terminal configured by a resector pull to which a plug, which is a connector on the optical cable side, can be connected.
That is, a transmission line 30b including one optical cable is connected to the output unit 15b. Then, the OPT-R and the OPT-L intensity-modulated by the RF-R and RF-L are transmitted to the TV receiver 20b by one optical cable.

The power supply to the amplification units 131 and 141 and the E / O conversion units 133 and 143 is performed via the transmission line 30b as in the case of the second embodiment.
[3-3. TV receiver]
The TV receiver 20b includes a satellite connector 21b, a terrestrial digital connector 22, a converter unit 23b, and a main body unit 25. Further, although not shown, the TV receiver 20b includes a power supply circuit for supplying power to the satellite antenna 10b via the transmission line 30b.

The satellite connector 21b is configured in the same manner as the output unit 15b of the satellite antenna 10b, and includes one input terminal.
The converter unit 23b includes a demultiplexer 239, an O / E conversion unit 237, 238, amplifiers 231, 232, FCV 233, 234, and BPF 235, 236. That is, it has a configuration in which a demultiplexer 239 is added to the converter unit 23a shown in the second embodiment.

The demultiplexer 239 demultiplexes the optical signal input from the satellite connector 21b into OPT-R and OPT-L, supplies OPT-R to the OE conversion unit 237, and supplies OPT-L to the OE conversion unit. Supply to 238.

Hereinafter, the processing for OPT-R and OPT-L in the converter unit 23b is the same as the processing in the converter unit 23a of the second embodiment.
[3-4. effect]
According to the third embodiment described in detail above, the effects (1a) to (1d) and (2a) to (2b) of the above-mentioned first embodiment and the second embodiment are exhibited, and further, the following effects are exhibited. ..

(3a) In the satellite broadcast receiving system 1b, since the OPT-R and the OPT-L are transmitted by a single optical cable by wavelength division multiplexing, the system can be configured by using an inexpensive transmission line 30b.

[4. Fourth Embodiment]
[4-1. Differences from the second embodiment]
The configuration of the fourth embodiment is shown in FIG.

Since the basic configuration of the fourth embodiment is the same as that of the second embodiment, the differences will be described below. The same reference numerals as those in the first to third embodiments indicate the same configurations, and the preceding description will be referred to.

In the second embodiment described above, OPT-R and OPT-L intensity-modulated by RF-R and RF-L are used as transmission signals from the satellite antenna 10a to the TV receiver 20a, and two optical cables are provided. Transmission is performed by the transmission line 30a. On the other hand, the fourth embodiment is different from the second embodiment in that transmission is performed using an electric signal for RF-R and an optical signal (that is, OPT-L) for RF-L.

As shown in FIG. 5, the satellite broadcast receiving system 1c of the fourth embodiment includes a satellite antenna 10c, a TV receiver 20c, and a transmission line 30c.
[4-2. Satellite antenna]
The satellite antenna 10c includes a reflector 11, a primary radiator 12, a right-handed rotation processing unit 13c, a left-handed rotation processing unit 14a, and an output unit 15c. That is, the satellite antenna 10c has a configuration of the right-handed rotation processing unit 13c and the output unit 15c different from that of the second embodiment.

The right-handed rotation processing unit 13c includes an amplification unit 131, a BPF 132, an FCV 134, and a BPF 135. That is, the right-handed rotation processing unit 13c has a configuration in which FCV134 and BPF135 are added to the right-handed rotation processing unit 13a in the second embodiment and the E / O conversion unit 133 is removed.

FCV134 and BPF135 are configured in the same manner as FCV233 and BPF235 described in the first embodiment. That is, the FCV 134 mixes the RF-R amplified by the amplification unit 131 and the unnecessary signal component removed by the BPF 132 with the local signal for right rotation, and extracts the component having the difference frequency of both signals. Generate IF-R. The BPF 135 selectively extracts a signal in the frequency band used in the IF-R from the output signal from the FCV 134 and supplies the signal to the output unit 15c.

The output unit 15c is a connector including an electric output terminal to which a coaxial cable is connected and an optical output terminal to which an optical cable is connected. That is, a composite cable having a coaxial cable and an optical cable is connected to the output unit 15c as a transmission line 30c. The IF-R supplied from the right-handed rotation processing unit 13c is transmitted to the TV receiver 20c by a coaxial cable, and the OPT-L supplied from the left-handed rotation processing unit 14a is transmitted by an optical cable. In this case, IF-R corresponds to the conversion reception signal.

The power supply to the amplification units 131, 141, FCV 134, and E / O conversion unit 143 is performed via the transmission line 30c. Specifically, the DC component superimposed on the coaxial cable that transmits the IF-R may be separated to supply power. Further, a feeding line different from the coaxial cable for signal transmission may be separately provided on the transmission line 30c, and power may be supplied by this feeding line.

[4-3. TV receiver]
The TV receiver 20c includes a satellite connector 21c, a terrestrial digital connector 22, a converter unit 23c, and a main body unit 25. Further, although not shown, the TV receiver 20c includes a power supply circuit for supplying power to the satellite antenna 10c via the transmission line 30c.

The satellite connector 21c is configured in the same manner as the output unit 15c of the satellite antenna 10c, and includes an electrical input terminal and an optical input terminal.
The converter unit 23c includes an O / E conversion unit 238, amplifiers 231,232, FCV234, and BPF235,236. That is, it has a configuration in which the O / E conversion unit 237 and the FCV 233 are removed from the converter unit 23a shown in the second embodiment.

The IF-R input from the electrical input terminal of the satellite connector 21c is amplified by the amplifier 231 and the signal of the frequency band used by the IF-R is selectively extracted by the BPF 235.
The processing for the OPT-L input from the optical input terminal of the satellite connector 21c is the same as the processing in the converter unit 23a of the second embodiment.

[4-4. effect]
According to the fourth embodiment described in detail above, the following effects are obtained.
(4a) In the satellite broadcast receiving system 1c, as transmission signals from the satellite antenna 10c to the TV receiver 20c, IF-R frequency-converted RF-R and OPT-, which is an optical signal intensity-modulated by RF-L. L and are used. That is, in the satellite antenna 10c, the right-handed rotation processing unit 13c has a source of the right-handed local signal, but the left-handed turning processing unit 14 does not have a source of the left-handed local signal. Therefore, the frequency difference between the two local signals is used as a component, noise that overlaps with the IF-R frequency band does not occur, and deterioration of the C / N of the signal transmitted via the transmission line 30c can be suppressed. ..

Further, in the TV receiver 20c, the IF-R processing system does not have a right-handed local signal source, and the OPT-L processing system has a left-handed local signal source. Therefore, even on the TV receiver 20c side, it is possible to suppress the generation of noise whose component is the frequency difference between the two local signals.

(4b) In the satellite antenna 10c of the satellite broadcast receiving system 1c, since the left-handed rotation processing unit 14 does not perform frequency conversion, no image signal is generated, and a filter for removing the image signal becomes unnecessary. Therefore, according to the satellite antenna 10c, the device configuration can be simplified as compared with the conventional satellite antenna that performs frequency conversion in both right-handed and left-handed rotation.

[4-5. Modification example]
In the fourth embodiment, IF-R and OPT-L are used as signals to be transmitted from the satellite antenna 10c to the TV receiver 20c, but OPT-R and IF-L may be used. That is, in the satellite antenna, RF-R may be configured to be converted into an optical signal without frequency conversion, and RF-L may be configured to perform frequency conversion.

[5. Fifth Embodiment]
[5-1. Differences from the fourth embodiment]
The configuration of the fifth embodiment is shown in FIG.

Since the basic configuration of the fifth embodiment is the same as that of the fourth embodiment, the differences will be described below. The same reference numerals as those in the first to fourth embodiments indicate the same configurations, and the preceding description will be referred to.

In the fourth embodiment described above, as a transmission signal from the satellite antenna 10c to the TV receiver 20c, an electric signal IF-R and an optical signal OPT-L are used, and a transmission line 30c having a coaxial cable and an optical cable is used. It is transmitting. On the other hand, in the fifth embodiment, the RF-L is transmitted as an electric signal without being converted into an optical signal, so that the transmission is performed by the transmission line 30d having one coaxial cable. Different from the form.

As shown in FIG. 6, the satellite broadcast receiving system 1d of the fifth embodiment includes a satellite antenna 10d, a TV receiver 20d, and a transmission line 30d.
[5-2. Satellite antenna]
The satellite antenna 10d includes a reflector 11, a primary radiator 12, a right-handed rotation processing unit 13c, a left-handed rotation processing unit 14, and an output unit 15d. That is, in the satellite antenna 10d, the configurations of the left-handed rotation processing unit 14 and the output unit 15d are different from those in the fourth embodiment.

The left-handed rotation processing unit 14 amplifies RF-L and supplies it to the output unit 15d without converting it into an optical signal.
The output unit 15d is a connector provided with one output terminal to which a coaxial cable is connected. That is, a transmission line 30d having a single coaxial cable is connected to the output unit 15d. Then, the IF-R supplied from the right-handed rotation processing unit 13c and the RF-L supplied from the left-handed rotation processing unit 14 are combined, and as a frequency-multiplexed signal, the transmission line 30d up to the TV receiver 20d. Be transmitted. Since the frequency bands used by IF-R and RF-L are different, transmission by a single coaxial cable is possible.

The power supply to the amplification units 131 and 141 and the FCV 134 is performed via the transmission line 30d. Specifically, the DC component superimposed on the coaxial cable that transmits IF-R and RF-L may be separated to supply power. Further, a feeding line different from the coaxial cable for signal transmission may be separately provided on the transmission line 30d, and power may be supplied by this feeding line.

[5-3. TV receiver]
The TV receiver 20d includes a satellite connector 21d, a terrestrial digital connector 22, a converter unit 23d, and a main body unit 25. Further, although not shown, the TV receiver 20d includes a power supply circuit for supplying power to the satellite antenna 10d via the transmission line 30d.

The satellite connector 21d is configured in the same manner as the output unit 15d of the satellite antenna 10d, and includes one input terminal to which a coaxial cable is connected.
The converter unit 23d includes a BPF 241,242, an amplifier 231,232, an FCV 234, and a BPF 235, 236. That is, it has a configuration in which the O / E conversion unit 238 is removed from the converter unit 23c shown in the fourth embodiment and the BPF 241,242 is added.

The BPF 241 selectively extracts a signal in the frequency band used in the IF-R from the input signal supplied from the satellite connector 21d. Hereinafter, the processing of the IF-R extracted by the BPF 241 with the amplifier 231 and the BPF 235 is the same as the processing with the converter unit 23c of the fourth embodiment.

The BPF 242 selectively extracts a signal in the frequency band used in RF-L from the input signal supplied from the satellite connector 21d. Hereinafter, the processing of the RF-L extracted by the BPF 242 with the amplifier 232, FCV234, and BPF236 is the same as the processing with the converter unit 23c of the fourth embodiment.

[5-4. effect]
According to the fifth embodiment described in detail above, the effects (4a) to (4b) of the above-mentioned fourth embodiment are exhibited, and the following effects are further achieved.

(5a) In the satellite broadcast receiving system 1d, since IF-R and RF-L are transmitted by one coaxial cable by frequency division multiplexing, the system configuration can be simplified.
[5-5. Modification example]
In the fifth embodiment, IF-R and RF-L are used as signals to be transmitted from the satellite antenna 10d to the TV receiver 20d, but conversely, RF-R and IF-L may be used. .. That is, the satellite antenna may be configured to perform frequency conversion on RF-L without performing frequency conversion on RF-R.

[6. 6th Embodiment]
[6-1. Differences from the first embodiment]
The configuration of the sixth embodiment is shown in FIG.

Since the basic configuration of the sixth embodiment is the same as that of the first embodiment, the differences will be described below. The same reference numerals as those in the first embodiment indicate the same configurations, and the preceding description will be referred to.

As shown in FIG. 7, the satellite broadcast receiving system 1e of the sixth embodiment includes a satellite antenna 10, a converter 40, a TV receiver 20e, and a transmission line 30. That is, in the present embodiment, the converter 40 and the TV receiver 20e are provided instead of the TV receiver 20 of the first embodiment.

The converter 40 has a configuration in which an input connector 41 and an output connector 42 are added to the converter unit 23. Further, although not shown, the converter 40 includes a power supply circuit for supplying power to the satellite antenna 10 via the transmission line 30.

The input connector 41 is the same as the satellite connector 21. The output connector 42 includes one output terminal to which a coaxial cable is connected, and outputs a signal obtained by combining IF-R and IF-L.

The TV receiver 20e includes a satellite connector 21e and a terrestrial digital connector 22, and has a function corresponding to the main body 25 of the TV receiver 20 in the first embodiment. The satellite connector 21e has one input terminal to which a coaxial cable is connected, and a signal obtained by combining IF-R and IF-L generated by the converter 40 is input.

[6-2. effect]
According to the sixth embodiment described in detail above, the effects (1a) to (1b) of the above-mentioned first embodiment are exhibited, and the following effects are further achieved.

(6a) In the satellite broadcast receiving system 1e, the converter 40 is provided separately from the TV receiver 20e. Therefore, the system can be configured by using the TV receiver 20e configured on the premise that the frequency conversion is executed on the satellite antenna side.

[6-3. Modification example]
In the sixth embodiment, the case where the TV receiver 20e provided with the satellite connector 21e and the terrestrial digital connector 22 is used has been described, but as shown in FIG. 8, the TV receiver 20f has only the common connector 21f. Will be described. The common connector 21f includes one input terminal to which a coaxial cable is connected, and a signal obtained by combining IF-R, IF-L, and RF-D is input.

In this case, the converter 40a includes a terrestrial digital connector 43 and a BPF 243 in addition to the configuration of the converter 40 described with reference to FIG. 7.
The terrestrial digital connector 43 is the same as the terrestrial digital connector 22. The BPF 243 selectively extracts a signal in the frequency band used in RF-D from the input signal supplied from the terrestrial digital connector 43. Then, the output connector 42 outputs a signal obtained by combining the IF-R from the BPF 235, the IF-L from the BPF 236, and the RF-D from the BPF 243.

In this case, even if the TV receiver 20f is configured to input IF-R, IF-L, and RF-D from one common connector 21f, the system can be configured by using the converter 40a.

Further, in FIGS. 7 and 8, converters 40 and 40a are illustrated on the premise that the satellite antenna 10 shown in the first embodiment is used, but when the satellite antennas 10a to 10d are used, the corresponding converters are used. A converter including the configurations of parts 23a to 23d may be used.

[7. Other embodiments]
Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various aspects can be taken without departing from the gist of the present disclosure.

(7a) In the above embodiment, the satellite antenna that receives the BS / CS broadcast radio waves transmitted by the right-handed circularly polarized wave and the left-handed circularly polarized wave has been described. However, the present disclosure may be a satellite antenna that receives a plurality of broadcast radio waves transmitted from one artificial satellite by different polarization methods. Further, it may be a satellite antenna that receives radio waves of two polarized waves that are orthogonal to each other, such as vertical and horizontal. Further, it may be a satellite antenna that receives only one type of polarized wave.

(7b) In the above embodiment, the frequencies of the received signal, the locally oscillated signal, and the IF signal have been described with specific examples, but the frequency described in the above embodiment is an example, and the frequency of the signal to be frequency-converted. It may be set appropriately according to the frequency.

(7c) In the above embodiment, a bandpass filter (BPF) is used as the filter, but a lowpass filter (LPF) or a highpass filter (HPF) may be used as long as the necessary signals can be separated. ..

(7d) In the first embodiment, the second embodiment, and the sixth embodiment, the satellite antennas 10 and 10a include both the right-handed rotation processing unit 13 and the left-handed rotation processing unit 14, but one of them is provided. It may be a provided configuration. In this case, the converter units 23, 23a or the converter 40 may also be configured to include only one processing system that processes the signal supplied from the satellite antenna.

(7e) In the fourth embodiment, a case has been shown in which a high frequency non-conversion received signal is converted into an optical signal and transmitted, and a lower frequency converted reception signal is transmitted as an electric signal, but the present invention is limited to this. It's not something. For example, the unconverted received signal may be transmitted as an electric signal, and the converted received signal may be converted into an optical signal and transmitted. Further, both the non-converted received signal and the converted received signal may be converted into an optical signal and transmitted.

(7f) In the above-described embodiment, the TV receivers 20 and 20a to 20d include converter units 23, 23a to 23d, and the TV receivers 20e and 20f have satellite antennas 10, 10a to via converters 40 and 40a. It is configured to input a signal from 10d. However, if the TV receiver can directly receive the satellite broadcast signal in the 12 GHz band in the future, the converter units 23, 23a to 23d and the converters 40, 40a may be omitted.

1,1a-1e ... Satellite broadcast reception system, 10,10a-10d ... Satellite antenna, 11 ... Reflector, 12 ... Primary radiator, 12L, 12R ... Probe, 13,13a, 13c ... Right-handed processing unit, 14, 14a ... Left-handed processing unit, 15, 15a to 15d ... Output unit, 16 ... Combiner, 20, 20a to 20f ... TV receiver, 21,21a to 21e ... Satellite connector, 21f ... Common connector, 22, 43 ... Terrestrial digital connector, 23, 23a to 23d ... converter unit, 25 ... main unit, 30, 30a to 30d ... transmission line, 40, 40a ... converter, 41 ... input connector, 42 ... output connector, 121 ... septum, 131, 141,231,232 ... Amplifier, 132, 135, 142, 235, 236, 241 to 243 ... Band path filter (BPF), 133, 143 ... E / O converter, 134, 233, 234 ... Frequency conversion Instrument (FCV), 237, 238 ... O / E conversion unit, 239 ... Demultiplexer.

Claims (14)

A reflector that reflects satellite broadcast waves,
The primary radiator located at the focal position of the reflector and
An output unit to which a transmission line for transmitting an output signal from the primary radiator is connected and
A satellite antenna equipped with. The satellite antenna according to claim 1.
Further provided with an optical converter that converts the output signal from the primary radiator into an optical signal
A satellite antenna to which an optical cable is connected as the transmission line to the output unit. A reflector that reflects satellite broadcast waves,
The primary radiator located at the focal position of the reflector and
A polarization separator that separates the received signal received by the primary radiator into a right-handed signal and a left-handed signal,
An output unit to which a transmission line for transmitting the right-handed signal and the left-handed signal separated by the polarization separator is connected, and
A satellite antenna equipped with. The satellite antenna according to claim 3.
The output unit is a satellite antenna configured such that at least two electric cables for individually transmitting the right-handed signal and the left-handed signal are connected as the transmission line. The satellite antenna according to claim 3.
An optical conversion unit that converts the right-handed signal and the left-handed signal into optical signals is further provided.
The output unit is a satellite antenna configured such that at least two optical cables for individually transmitting two optical signals converted by the optical conversion unit are connected as the transmission line. The satellite antenna according to claim 3.
An optical conversion unit that converts the right-handed signal and the left-handed signal into optical signals, respectively.
A combiner that combines two optical signals converted by the optical conversion unit, and
With more
The output unit is a satellite antenna configured such that at least one optical cable for transmitting an optical signal combined by the combiner is connected as the transmission line. A reflector that reflects satellite broadcast waves,
The primary radiator located at the focal position of the reflector and
A polarization separator that separates the received signal received by the primary radiator into a right-handed signal and a left-handed signal,
Of the right-handed signal and the left-handed signal separated by the polarization separator, one of them is a non-conversion signal and the other is a conversion target signal, and the frequency of the conversion target signal is frequency-converted to generate an IF signal. With a converter,
An output unit to which a transmission line for transmitting the non-converted signal and the IF signal is connected, and
A satellite antenna equipped with. The satellite antenna according to claim 7.
The output unit is a satellite antenna configured such that at least one electric cable for transmitting a signal obtained by combining the unconverted signal and the IF signal is connected as the transmission line. The satellite antenna according to claim 7.
Further provided with an optical conversion unit that converts the non-conversion signal into an optical signal,
As the transmission line, the output unit includes an electric cable that transmits an IF signal generated by the frequency conversion unit and an optical cable that transmits an optical signal converted by the optical conversion unit. At least configured to be connected,
Satellite antenna. A satellite antenna that receives satellite broadcast waves and outputs the received signal as an unconverted received signal without frequency conversion to an IF signal.
A transmission line that transmits the unconverted reception signal output from the satellite antenna, and
A converter that converts the unconverted received signal received via the transmission line into an IF signal and outputs the signal.
A satellite broadcast reception system equipped with. It receives two types of satellite broadcast waves with different polarizations, frequency-converts the reception signal of the first polarization into an IF signal and outputs it as a conversion reception signal, and outputs the reception signal of the second polarization as an IF signal. A satellite antenna that outputs as an unconverted received signal without frequency conversion to a signal,
A transmission line that transmits the converted reception signal and the non-conversion reception signal output from the satellite antenna, and
A converter that converts the unconverted received signal received via the transmission line into an IF signal having a frequency different from that of the converted received signal and outputs the converted received signal together with the converted received signal.
A satellite broadcast reception system equipped with. The satellite broadcast receiving system according to claim 10 or 11.
The converter is a satellite broadcasting receiving system that acquires signals in the frequency band used in terrestrial digital broadcasting and CATV, mixes them with the IF signals, and outputs the signals. The satellite broadcast receiving system according to any one of claims 10 to 12.
The satellite antenna converts the unconverted received signal into an optical signal and outputs the signal.
The transmission line includes at least an optical cable and
The converter is a satellite broadcast receiving system including an O / E converter that converts the optical signal transmitted via the optical cable into an electric signal. The satellite broadcast receiving system according to any one of claims 10 to 13.
The converter is built into the TV receiver and
The TV receiver is a satellite broadcast receiving system including a satellite connector for connecting the transmission line.