JP2000031852A - Converter for receiving circularly polarized wave and linearly polarized wave - Google Patents

Abstract

PROBLEM TO BE SOLVED: To receive the radio waves of one-way circularly polarized wave and linearly polarized wave transmitted from two satellites on the same orbit through one antenna device. SOLUTION: The signals of circularly and linearly polarized waves transmitted from two satellites on the same orbit are received by a horn circuit part 1 and the signals are synthesized while delaying one of these signals at 90 deg. so as to extract the signal of clockwise polarized wave. This signal of clockwise polarized wave is converted to the signal of an intermediate frequency(IF) band by a mixer 14 and sent from an output terminal 19 to a BS tuner, for example. Besides, any one of signals of vertically and horizontally polarized wave received by a first substrate probe 2 and a second substrate probe 3 is selected by a switching signal from a CS tuner and that selected signal is converted to the signal of the IF band and sent from an output terminal 17 to the CS tuner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circle for receiving single circularly polarized waves (right-handed circularly polarized waves) and linearly polarized waves (vertically and horizontally polarized waves) transmitted from two satellites in the same orbit. The present invention relates to a converter for receiving polarized / linearly polarized waves.

[0002]

2. Description of the Related Art There are two satellites in the same orbit. A first satellite performs service using a first transmission frequency band by single circular polarization (right-handed circular polarization). Satellites provide services using the second transmission frequency band with linear polarization (vertical / horizontal polarization), in order to receive radio waves having different polarization systems, conventionally, separate services are used. Two antenna devices are used. For example, in the state where BS broadcasting which is the first satellite is performing service using right-handed circular polarization, a second satellite (CS) is subsequently launched on the same orbit, and vertical and horizontal polarizations are used. To perform the service, two antenna devices are required on the receiving side.

[0003]

As described above, when receiving a single-polarized wave and a linearly-polarized wave (vertical and horizontal polarization) transmitted from two satellites in the same orbit, two units are used. However, there is a problem that the installation of the antenna device is troublesome and the installation cost is high.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is an object of the present invention to receive a single circularly polarized wave and a linearly polarized wave transmitted from two satellites in the same orbit by a single antenna device. It is an object of the present invention to provide a circularly-polarized / linearly-polarized wave receiving converter capable of performing the following.

[0005]

SUMMARY OF THE INVENTION The present invention provides a converter for receiving circularly polarized waves and linearly polarized waves which receives single circularly polarized waves and linearly polarized signals transmitted from two satellites in the same orbit.
A horn circuit unit including a first substrate probe for receiving a vertically polarized wave and a second substrate probe for receiving a horizontally polarized wave for receiving a radio wave transmitted from the satellite, the first substrate probe and the second A single-circularly polarized wave receiving means for combining the received signals of the substrate probes with a phase difference of 90 degrees and receiving a single-circularly polarized wave signal, and a vertically polarized wave output from the first and second substrate probes. A switch for switching between a wave and a horizontally polarized signal by a switching signal from a tuner, and a first for converting the vertically or horizontally polarized signal selected by the switch into an intermediate frequency band signal. Frequency conversion means, a first output terminal for outputting the signal converted by the first frequency conversion means, and a single circular polarization signal received by the single circular polarization reception means to an intermediate frequency band signal. Second frequency converting means for converting; Characterized by comprising a second output terminal for outputting the converted signal by the second frequency converting means.

Further, the present invention relates to a circularly polarized wave / linearly polarized wave receiving converter for receiving a single circularly polarized wave and a linearly polarized wave signal transmitted from two satellites in the same orbit, wherein the transmission from the satellite is performed. A horn circuit unit including a first substrate probe for receiving a vertically polarized wave and a second substrate probe for receiving a horizontally polarized wave for receiving radio waves, and reception signals of the first and second substrate probes. A single circular polarized wave receiving means for combining the signals with a phase difference of 90 degrees to receive a single circular polarized signal,
A switch for switching and outputting vertical and horizontal polarization signals output from the substrate probe and the second substrate probe by a switching signal from a tuner, and a vertical or horizontal polarization selected by the switch. First frequency conversion means for converting a wave signal into an intermediate frequency band signal, and second frequency conversion means for converting a single circular polarization signal received by the single circular polarization receiving means into an intermediate frequency band signal Means, a mixer for mixing the signals converted by the first frequency conversion means and the second frequency conversion means, and an output terminal for outputting the signal mixed by the mixer. I do.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 shows two tracks on the same orbit.
One satellite, for example a first satellite (BS), provides service using single circular polarization (right-handed circular polarization) and a second satellite (C
When S) provides a service with linear polarization (vertical / horizontal polarization), the transmission signal of the single circular polarization and the linear polarization (vertical / horizontal polarization) is received by one antenna device. It is a block diagram of a horn integrated type converter.

In FIG. 1, reference numeral 1 denotes a horn circuit unit to which single-circle and linearly-polarized signals transmitted from the first and second satellites are input. The horn circuit unit 1 has a first substrate. The probe 2 is provided so as to be located vertically, and the two substrate probes 3 are provided so as to be located horizontally. That is,
The first substrate probe 2 and the second substrate probe 3 are arranged so as to maintain a positional relationship of 90 degrees. The first substrate probe 2 is provided for receiving a vertically polarized component of a received radio wave, and the second substrate probe 3 is provided for receiving a horizontally polarized component.

The output signals of the first substrate probe 2 and the second substrate probe 3 are transmitted through equal length transmission lines L11 and L21 to the low noise amplifier (LN).
A) The signals are input to 4 and 5, and the amplified signals are input to the splitters 6 and 7 via transmission lines L12 and L22 having the same length. One split output signal of each of the two splitters 6 and 7 is input to input terminals a and b of a switch 10 via low noise amplifiers 8 and 9, respectively. That is, the vertically polarized reception signal from the first substrate probe 2 is amplified by the low noise amplifiers 4 and 8 and input to the input terminal a of the switch 10, and the horizontally polarized reception signal from the second substrate probe 3 is output. Are amplified by the low noise amplifiers 5 and 9 and input to the input terminal b of the switch 10.

The other output signal of the splitter 7 is input to a mixer 12 via a transmission line L13, a 90-degree phase shifter 11 for delaying the phase by 90 degrees, and a transmission line L14. 7 is the transmission line L2
3 is input to the mixer 12. That is, the received signal of the vertically polarized wave by the first substrate probe 2 is input to the mixer 12 via the low noise amplifier 4 and the phase shifter 11, and the received signal of the horizontally polarized wave by the second substrate probe 3 is low. Amplified by the noise amplifier 5 and input to the mixer 12,
These two signals are mixed with a phase difference of 90 degrees to extract a right-handed circularly polarized reception signal. In this case, since the electrical length of the transmission path from the first substrate probe 2 to the mixer 12 must be longer than the electrical length of the transmission path from the second substrate probe 3 to the mixer 12 by λg / 2, Table 11
Adjusts the electrical length of the transmission line.

The switch 10 is operated by a switching signal described later, and switches between a vertically polarized signal output from the low noise amplifier 8 and a horizontally polarized signal output from the low noise amplifier 9. Input to the mixer 13 for frequency conversion. The right-handed circularly polarized signal output from the mixer 12 is input to a mixer 14 for frequency conversion. The mixers 13 and 14 receive a local oscillation signal from a local oscillator 15. The mixer 13 and the local oscillator 15,
The mixer 14 and the local oscillator 15 constitute a frequency converter.

The mixer 13 mixes the vertically polarized or horizontally polarized reception signal selected by the switch 10 with the local oscillation signal of the local oscillator 15, converts the signal into an intermediate frequency band signal, and outputs the signal. . The signal in the intermediate frequency band output from the mixer 13 is amplified by the low noise amplifier 16 and output to the output terminal 17. The mixer 14 mixes the signal distributed by the two divider 7 with the local oscillation signal of the local oscillator 15, converts the signal into an intermediate frequency band signal, and outputs the signal. The signal in the intermediate frequency band output from mixer 14 is amplified by low noise amplifier 18 and output to output terminal 19.

Although not shown, the output terminals 17 and 19 are connected via a coaxial cable to a tuner for receiving a CS broadcast, for example.
Connected to tuner for receiving BS broadcast. A switching signal is input to the output terminal 17 from, for example, a CS tuner, and the switching of the switch 10 is controlled by the switching signal. The switching device 10 is configured using, for example, a pin diode or the like, selects a vertically polarized signal or a horizontally polarized signal according to a switching signal from the CS tuner, and outputs the signal to the mixer 13 from an output terminal c.

Next, the operation of the above embodiment will be described. FIG.
In the figure, two satellites exist in the same orbit, and the frequency allocation and the state of polarization of the two satellites are shown. (A) shows the reception frequency, and (b) shows the output frequency. Now, FIG.
As shown in (a), the first satellite (BS) is 11.7 to 1
The second satellite (CS) operates with a right-handed circular polarization of 2.2 GHz and a vertical satellite of 11.45 to 11.69 GHz.
It is assumed that services of horizontal polarization and vertical / horizontal polarization of 12.25 to 12.75 GHz are provided. And
On the receiving converter side, it is assumed that the oscillation frequency Lo of the local oscillator 15 is set to, for example, 10.678 GHz.

The horn circuit unit 1 converts the single circularly polarized (right-handed circularly polarized) and linearly polarized (vertically and horizontally polarized) signals transmitted from the two satellites into a first substrate probe 2. And received by the second substrate probe 3. The received signal of the vertically polarized wave by the first substrate probe 2 is a low noise amplifier 4,
8, the signal is input to the input terminal a of the switch 10, and the horizontally polarized reception signal from the second substrate probe 3 is amplified by the low noise amplifiers 5 and 9 and input to the input terminal b of the switch 10. You. The switch 10 operates by a switching signal sent from the CS tuner, and switches between a vertically polarized signal output from the low noise amplifier 8 and a horizontally polarized signal output from the low noise amplifier 9. Mixer 1 for frequency conversion
Enter 3

The mixer 13 mixes the vertically polarized or horizontally polarized reception signal selected by the switch 10 with the local oscillation signal of the local oscillator 15, converts the signal into an intermediate frequency band signal, and outputs the signal. . In this case, as shown in FIG. 2, the local oscillation frequency Lo of the local oscillator 15 is 10.678 GHz.
If the vertical and horizontal polarization of 11.45 to 11.69 GHz transmitted from the second satellite (CS) is 77,
It is converted into a signal of the intermediate frequency band of 2 to 1012 MHz,
In addition, signals of 12.25 to 12.75 GHz vertically and horizontally polarized waves are converted into signals of 1572 to 2072 MHz intermediate frequency band. The signal in the intermediate frequency band converted by the mixer 13 as described above is amplified by the low noise amplifier 16, and then sent from the output terminal 17 to the CS tuner via a coaxial cable.

The vertically polarized reception signal from the first substrate probe 2 is input to the mixer 12 via the low noise amplifier 4 and the phase shifter 11, and the horizontally polarized reception signal from the second substrate probe 3 is The signal is amplified by the low-noise amplifier 5 and input to the mixer 12, where these two signals are mixed to extract a right-hand circularly polarized reception signal.

The right-handed circularly polarized signal output from the mixer 12 is input to a mixer 14. This mixer 14
Mixes the right-handed circularly polarized signal sent from the mixer 12 with the local oscillation signal of the local oscillator 15, converts the signal into an intermediate frequency band signal, and outputs the signal. That is, the mixer 14
11.7 to 12 sent from the first satellite (BS).
102 GHz to 1522 MH
The signal is converted into a signal in the intermediate frequency band of z. The signal in the intermediate frequency band converted by the mixer 14 is supplied to the low noise amplifier 1
After being amplified at 8, the signal is sent from the output terminal 19 to the BS tuner via a coaxial cable.

As described above, the signal in the intermediate frequency band for the vertical and horizontal polarization transmitted from the second satellite (CS) is output from the output terminal 17, and the first satellite is output from the output terminal 19. (BS), a signal in the intermediate frequency band for the right-handed circularly polarized wave is output, so that a single circularly polarized wave and a linearly polarized wave (vertical and vertical) transmitted from two satellites in the same orbit are output.
(Horizontal polarization) signal can be received by one antenna device.

(Second Embodiment) Next, a second embodiment of the present invention will be described. FIG. 3 is a block diagram of a receiving converter according to the second embodiment of the present invention. While the first embodiment shown in FIG. 1 is provided with two output terminals 17 and 19, this second embodiment is different from the second satellite (C
S) The output signal of the low noise amplifier 16 of the system and the output signal of the low noise amplifier 18 of the first satellite (BS) system are mixed with the mixer 2
1 and the mixed signal is transmitted from the output terminal 17 to the receiver via one coaxial cable. On the receiver side, the signal sent by the single coaxial cable is split into, for example, a BS broadcast signal and a CS broadcast signal by a demultiplexer, and input to the BS tuner and the CS tuner. It should be noted that a single tuner in which the function of the BS tuner and the function of the CS tuner are provided in an integrated manner has a built-in duplexer, so that it is not particularly necessary to provide a duplexer outside the tuner.

As described in the second embodiment, the output signals of the low noise amplifiers 16 and 18 are mixed by the mixer 21 and output, so that the output signal of the converter is transmitted to the receiver via one coaxial cable. Can be transmitted.

[0023]

As described above in detail, according to the present invention, the signals transmitted from the two satellites in the same orbit receive the first substrate probe for vertical polarization reception in the horn circuit section and the horizontal polarization reception. The signal is received by the second substrate probe, and one of the signals is delayed by 90 degrees and combined to obtain a single circularly polarized signal, which is further converted into an intermediate frequency band signal and transmitted to, for example, a BS tuner. Further, a signal of vertical polarization and a signal of horizontal polarization output from the first substrate probe 2 and the second substrate probe are selected by a switching signal from a tuner, and the selected signal is converted into a signal of an intermediate frequency band. Since the signals are converted and transmitted to, for example, a CS tuner, radio waves transmitted from two satellites in the same orbit can be received by one antenna device.

Further, according to the present invention, the signals for the two tuners are mixed and transmitted by the mixer, so that the output signal of the converter can be transmitted to the tuners via one coaxial cable.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a circular polarization / linear polarization reception converter according to a first embodiment of the present invention.

FIG. 2 is an exemplary view showing frequency bands for describing a frequency conversion operation in the embodiment.

FIG. 3 is a block diagram showing a configuration of a circularly polarized wave / linearly polarized wave reception converter according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Horn circuit part 2 1st board probe 3 2nd board probe 4, 5 Low noise amplifier 6, 7 2 Divider 8, 9 Low noise amplifier 10 Switch 11 Phaser 12, 13, 14 Mixer 15 Local oscillator 16 , 18 Low noise amplifier 17, 19 Output terminal 21 Mixer

Continued on the front page F term (reference) 5K020 AA05 BB06 DD11 EE01 EE02 EE03 EE04 EE16 KK01 KK07 LL07 MM02 MM08 5K062 AA09 AB10 AB11 AB17 AC01 AD04 AD05 AE01 AE03 AE04 AE05 AG03 BA01 BA06 BB16 BC10 BE07 BF03

Claims (2)

[Claims] 1. A circularly polarized / linearly polarized wave receiving converter for receiving a single circularly polarized wave and a linearly polarized wave signal transmitted from two satellites in the same orbit, wherein the transmission wave from the satellite is received. A horn circuit section having a first substrate probe for receiving vertically polarized waves and a second substrate probe for receiving horizontally polarized waves; and a horn circuit section for receiving signals of the first and second substrate probes by 90 degrees. A single-polarization receiving means for receiving a single-polarization signal by synthesizing with a phase difference, and a tuner for vertically and horizontally polarized signals output from the first and second substrate probes. A switching unit that switches and outputs the signal of the vertical polarization or the horizontal polarization selected by the switching unit to a signal of an intermediate frequency band; Signal converted by frequency conversion means A first output terminal for outputting, a second frequency conversion means for converting a single circular polarization signal received by the single circular polarization reception means into a signal in an intermediate frequency band, and a second frequency conversion means. And a second output terminal for outputting the converted signal. A converter for receiving circularly polarized waves and linearly polarized waves. 2. A circularly polarized wave / linearly polarized wave receiving converter for receiving single circularly polarized wave and linearly polarized wave signal transmitted from two satellites in the same orbit, wherein the transmission wave from the satellite is received. A horn circuit section having a first substrate probe for receiving vertically polarized waves and a second substrate probe for receiving horizontally polarized waves; and a horn circuit section for receiving signals of the first and second substrate probes by 90 degrees. A single-polarization receiving means for receiving a single-polarization signal by synthesizing with a phase difference, and a tuner for vertically and horizontally polarized signals output from the first and second substrate probes. A switch for switching and outputting the signal of the vertical or horizontal polarization selected by the switch to a signal of an intermediate frequency band; Single circularly polarized signal received by the wave receiving means A second frequency converter for converting the signal into an intermediate frequency band signal; a mixer for mixing the signals converted by the first and second frequency converters; and a signal mixed by the mixer. And a output terminal for outputting a signal.