JP2010050723A - Radio device - Google Patents

Abstract

Data transmission characteristics are improved even if a part of a transmitted radio signal wraps around a receiving circuit due to insufficient polarization separation of a polarization separator.
A radio apparatus includes a transmission module 11 that generates a radio signal R1 modulated by a data signal D1, a distributor 12 that branches the radio signal R1 into two radio signals R2 and R3, and a polarization separator 14. The radio signal R2 given via the antenna 13 is transmitted to the counterpart radio apparatus, the radio signal R4 from the counterpart radio apparatus is received, and the radio signal R4 from the antenna 13 is output to the multiplexer 16. The polarization separator 14 that outputs the radio signal R2 from the distributor 12 to the antenna 13, the delay line 15 that passes the radio signal R3 and delays the phase, and the radio signal that is output from the polarization separator 14 A multiplexer 16 for multiplexing R5 and the radio signal R3 via the delay line 15 and a receiving module 17 for demodulating the radio signal R5 after multiplexing are provided.
[Selection] Figure 1

Description

  The present invention relates to a radio apparatus that performs bidirectional polarization multiplexing communication.

  In recent years, wireless communication systems using millimeter waves have been developed in order to cope with an increase in capacity of wireless communication. For example, a wireless communication system capable of transmitting a Gigabit Ethernet (registered trademark) signal (GbE signal) having a communication speed of 1.25 Gbps using a 60 GHz band radio wave has already been developed. Further, a wireless communication system capable of transmitting a 10 Gigabit Ethernet signal (10 GbE signal) using a 120 GHz band radio wave has been developed. Transmission of these broadband IP signals requires a very wide band for transmission per channel. In order to perform bidirectional communication in these wireless communication systems, if frequency multiplexing transmission is performed, a single wireless communication system occupies a band for two channels.

  One technique for realizing bidirectional communication without expanding the occupied band is the polarization multiplexing transmission technique. The polarization multiplexing transmission technique is a technique for modulating and transmitting different data to radio waves having different polarizations. If this method is used, it is possible to transmit data for two channels using the same frequency.

  In a radio communication system using polarization multiplexing transmission technology, a polarization separator for separating polarized waves is used. Non-Patent Document 1 proposes various polarization separators for the millimeter wave band.

  By the way, in these polarization beam splitters, a polarization separation degree (isolation) between polarized waves can be obtained only about 30 to 40 dB. In a wireless communication system, the strength of a transmitted radio signal is extremely higher than the strength of a received radio signal. Therefore, there arises a problem that data transmission characteristics are deteriorated.

  FIG. 4 is a block diagram illustrating a configuration of a wireless device in the wireless communication system.

  In the radio apparatus of FIG. 4, the transmission module 11 generates a radio signal R1 modulated by the data signal D1. The polarization separator 14 provides the radio signal R1 to the antenna 13. The antenna 13 radiates the radio signal R1 into space.

  The counterpart wireless device modulates the data signal to be transmitted to the wireless device in FIG. 4, and radiates the generated wireless signal R4 to the space. The antenna 13 receives the radio signal R4 and provides it to the polarization beam splitter 14. The polarization separator 14 outputs the radio signal R4 input from the antenna 13 to the reception module 17, and outputs the radio signal R1 input from the transmission module 11 to the antenna 13 and does not output it to the reception module 17. Designed to. However, when the isolation characteristic of the polarization separator 14 is insufficient, a part (R1 ') of the radio signal R1 input from the transmission module 11 is output to the reception module 17. Therefore, in this case, the radio signal R5 from the polarization separator 14 includes not only the radio signal R4 but also the component R1 'of the radio signal R1. The receiving module 17 demodulates the radio signal R5 and outputs a data signal D2 obtained by the demodulation.

As described above, since the radio signal R5 includes the component R1 ′ of the radio signal R1, the data signal D2 includes the data signal D1 ′ corresponding to the component R1 ′ of the radio signal R1 included in the radio signal R5. For this reason, the data signal D2 may not be equal to the data signal in the counterpart wireless device. That is, a part of the transmitted radio signal goes around to the circuit for reception, and the data transmission characteristics deteriorate.
Yoneda et al. "90 GHz band branching waveguide type demultiplexer", IEICE Tech. 133-138 IEEE TRANSACTION ON MICROWAVE THEORY AND TECHNIQUES, VOL. 53, NO. 12, DECEMBER 2005

  The present invention has been made in view of the above problems, and the object of the present invention is to circulate a part of a transmitted radio signal into a circuit for reception due to insufficient polarization separation of the polarization separator. It is an object of the present invention to provide a wireless device that can improve data transmission characteristics even when there is a problem.

  In order to solve the above-described problem, a radio apparatus according to a first aspect of the present invention includes a transmission module that generates a radio signal modulated with a data signal, a distributor that branches the radio signal, and one of the branched ones An antenna that transmits and receives a radio signal, and a polarization separator that outputs a radio signal input from the antenna to a multiplexer and outputs a radio signal input from the distributor to the antenna A delay line for allowing the other branched radio signal to pass through and delaying the phase, and a radio signal output from the polarization separator and a radio signal passing through the delay line are combined. And a receiving module that demodulates the combined radio signal.

  For example, the distribution ratio of the distributor is given to the multiplexer via the intensity of the component of the one radio signal included in the radio signal from the polarization separator to the multiplexer and the delay line. It is characterized in that it is determined so that the strength of the radio signal to be obtained is the same.

  For example, the difference between the line length from the distributor via the polarization separator to the multiplexer and the line length from the distributor via the delay line to the multiplexer is It is characterized by being 1/2 of the wavelength of the radio signal given to.

  According to a second aspect of the present invention, there is provided a radio apparatus for generating an IF signal modulated with a data signal, a distributor for branching the IF signal, a frequency of the one of the branched IF signals, An up-converter for generating a radio signal having an increased frequency, an antenna for transmitting the radio signal after the increase in frequency and receiving the radio signal, and outputting a radio signal input from the antenna to a down converter A polarization separator that outputs a radio signal input from the up-converter to the antenna, a delay line that delays a phase by passing the other branched IF signal, and an output from the polarization separator Downconverter for reducing the frequency of the radio signal to be generated and generating an IF signal having the reduced frequency, and the IF after the frequency reduction Characterized in that it comprises a multiplexer for multiplexing the IF signal passed through the delay line and items, and a demodulator for demodulating the IF signal after the multiplexing.

  For example, the distribution ratio of the distributor is the IF given to the multiplexer via the delay line and the intensity of the component of the one IF signal included in the IF signal from the down converter to the multiplexer. The signal strength is determined to be the same.

  For example, the down converter includes a radio signal amplifier that amplifies a radio signal from the polarization separator, and a mixer that outputs an IF signal after the frequency is reduced, and the radio device includes the delay line. The IF signal amplifier that amplifies the IF signal that passes through and the intensity of the IF signal output from the mixer are detected, the amplification factor of the radio signal amplifier is controlled so that the intensity is constant, and the amplification factor is And an amplification factor control circuit for controlling the amplification factor of the IF signal amplifier.

  For example, the amplification factor control circuit includes the intensity of the one IF signal component included in the IF signal output from the mixer and the intensity of the IF signal applied to the multiplexer via the delay line. Is the same.

  For example, the difference between the line length from the distributor to the multiplexer via the polarization separator and the line length from the distributor to the multiplexer via the delay line is the distributor It is characterized by being 1/2 of the wavelength of the IF signal given to.

  According to the present invention, data transmission characteristics can be improved even if a part of a transmitted radio signal wraps around a circuit for reception due to insufficient polarization separation of the polarization separator.

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

[First Embodiment]
FIG. 1 is a block diagram showing a configuration of a radio apparatus according to the first embodiment. The wireless device performs bidirectional polarization multiplexing communication with a partner wireless device (not shown).

  The wireless device includes a transmission module 11 that generates a wireless signal R1 modulated by a data signal D1 input from an external device (not shown), a distributor 12 that branches the wireless signal R1 into two wireless signals R2 and R3, An antenna 13 that radiates one radio signal R2 given through the polarization separator 14 to the space, transmits the radio signal R2 to the counterpart radio apparatus, and receives the radio signal R4 transmitted from the counterpart radio apparatus; The polarization separator 14 that outputs the radio signal R4 input from the antenna 12 to the multiplexer 16 and the radio signal R2 input from the distributor 12 to the antenna 13, and the other radio signal branched by the distributor 12 The delay line 15 for delaying the phase by passing through R3, the radio signal R5 output from the polarization separator 14 and the radio signal R3 via the delay line 15 are combined. Includes a multiplexer 16 which, the receiving module 17 which demodulates the radio signal R6 after multiplexing.

  The radio signal R5 from the polarization separator 14 may include not only the radio signal R4 but also the component R2 ′ of the radio signal R2, and the distribution ratio of the distributor 12, that is, the intensity ratio of the radio signals R2 and R3 is: It is determined that the intensity of the component R2 ′ of the radio signal R2 included in the radio signal R5 from the polarization separator 14 to the multiplexer 16 and the intensity of the radio signal R3 applied to the multiplexer 16 are the same. Yes.

  The difference between the line length from the distributor 12 via the polarization separator 14 to the multiplexer 16 and the line length from the distributor 12 via the delay line 15 to the multiplexer 16 is the wavelength of the radio signal R1. 1/2 of this.

  In the radio apparatus of FIG. 1, the transmission module 11 modulates a predetermined carrier wave with a data signal D1 to generate a radio signal R1. The distributor 12 branches the radio signal R1 into two radio signals R2 and R3. The polarization separator 14 provides the radio signal R <b> 2 to the antenna 13. The antenna 13 radiates the radio signal R2 into space. The counterpart wireless device receives and demodulates the radio signal R2, and the data signal D1 is obtained by demodulation.

  The counterpart wireless device modulates the data signal to be transmitted to the wireless device in FIG. 1 and radiates the generated wireless signal R4 to the space. The antenna 13 receives the radio signal R4 and provides it to the polarization beam splitter 14. The polarization separator 14 outputs the radio signal R4 input from the antenna 13 to the multiplexer 16 and outputs the radio signal R2 input from the distributor 12 to the antenna 13 and outputs it to the multiplexer 16. Designed not to. However, when the isolation characteristic of the polarization separator 14 is insufficient, a part (R 2 ′) of the radio signal R 2 input from the distributor 12 is output to the multiplexer 16. Therefore, the radio signal R5 from the polarization separator 14 includes not only the radio signal R4 but also the component R2 'of the radio signal R2.

  On the other hand, the delay line 15 delays the phase by passing the radio signal R3. The multiplexer 16 multiplexes the radio signal R5 from the polarization separator 14 and the radio signal R3 via the delay line 15. The receiving module 17 demodulates the combined radio signal R6 and outputs a data signal D2 obtained by the demodulation.

  As described above, the difference between the line length from the distributor 12 via the polarization separator 14 to the multiplexer 16 and the line length from the distributor 12 via the delay line 15 to the multiplexer 16 is as follows. Since the wavelength of the radio signal R1 is ½, the radio signal R3 given to the multiplexer 16 via the delay line 15 and the component R2 ′ of the radio signal R2 included in the radio signal R5 to the multiplexer 16. A phase difference of ½ wavelength, which is the same as the path difference, is generated between and. Thereby, the multiplexer 16 operates so that the component R2 'of the radio signal R2 and the radio signal R3 included in the radio signal R5 cancel each other.

  As described above, the distribution ratio of the distributor 12 is such that the intensity of the component R2 ′ of the radio signal R2 included in the radio signal R5 and the intensity of the radio signal R3 applied to the multiplexer 16 are the same. Therefore, in the multiplexer 16, the component R2 ′ and the radio signal R3 of the radio signal R2 included in the radio signal R5 cancel each other.

  As a result, the radio signal R6 is equal to the radio signal R4, and the data signal D2 is equal to the data signal before modulation in the counterpart radio apparatus.

  As described above, according to the first embodiment, it is possible to receive a data signal even when the polarization separation degree of the polarization separator 14 is insufficient, thereby improving the data transmission characteristics. it can. In the first embodiment, the line length from the distributor 12 via the polarization separator 14 to the multiplexer 16 and the line from the distributor 12 via the delay line 15 to the multiplexer 16 are described. Although the difference from the length is set to ½ of the wavelength of the radio signal R1, such setting is not essential, and at least the component R2 ′ of the radio signal R2 included in the radio signal R5 to the multiplexer 16 and the delay line 15 It is only necessary that a phase difference be generated between the wireless signal R3 and the radio signal R3 that is supplied to the multiplexer 16 via. This is because the multiplexer 16 operates so that at least the component R2 'of the radio signal R2 and the radio signal R3 included in the radio signal R5 cancel each other.

  In the first embodiment, the distribution ratio of the distributor 12 is set so that the intensity of the component R2 ′ of the radio signal R2 included in the radio signal R5 and the intensity of the radio signal R3 given to the multiplexer 16 are the same. However, the strengths may not be the same. This is because the multiplexer 16 operates so that at least the component R2 'of the radio signal R2 and the radio signal R3 cancel each other if the above-described phase difference occurs.

[Second Embodiment]
FIG. 2 is a block diagram showing a configuration of a radio apparatus according to the second embodiment. The wireless device performs bidirectional polarization multiplexing communication with a partner wireless device (not shown).

  An IF band modulator (hereinafter referred to as a modulator) 21 that generates an IF signal R11 modulated by a data signal D11 input from an external device (not shown), and the IF signal R11 is branched into two IF signals R12 and R13. An increase in the frequency given through the splitter 22, the upconverter 23 that increases the frequency of one of the branched IF signals R12 and generates the radio signal R14 having the increased frequency, and the polarization separator 25 The subsequent radio signal R14 is radiated into the space and transmitted to the counterpart radio apparatus, and the radio signal R15 transmitted from the counterpart radio apparatus is received, and the radio signal R15 input from the antenna 24 is converted to the down converter 27. And a polarization separator 25 that outputs a radio signal input from the up-converter 23 to the antenna 24, and a distribution The delay line 26 for passing the other IF signal R13 branched by 22 and delaying the phase, and the frequency of the radio signal R16 output from the polarization separator 25 are reduced, and the IF having the reduced frequency A down converter 27 for generating the signal 17, a combiner 28 for combining the IF signal R17 after frequency reduction and the IF signal R13 via the delay line 26, and an IF for demodulating the combined IF signal R18. A band demodulator (hereinafter referred to as a demodulator) 29.

  The IF signal R17 from the down converter 27 may include not only the component corresponding to the radio signal R15 but also the component R12 ′ of the IF signal R12, and the distribution ratio of the distributor 22, that is, the intensity ratio of the IF signals R12 and R13. Is such that the intensity of the component R12 ′ of the IF signal R12 included in the IF signal R17 to the multiplexer 28 and the intensity of the IF signal R13 applied to the multiplexer 28 via the delay line 26 are the same. It has been established.

  The difference between the line length from the distributor 22 via the polarization separator 25 to the multiplexer 28 and the line length from the distributor 22 via the delay line 26 to the multiplexer 28 is the IF signal R11. Is half of the wavelength.

  In the radio apparatus of FIG. 2, the modulator 21 modulates a predetermined carrier wave with the data signal D11 to generate an IF signal R11. The IF signal R11 is a radio signal in an intermediate frequency (IF) band. The distributor 22 branches the IF signal R11 into two IF signals R12 and R13. The up-converter 23 increases the frequency of one of the branched IF signals R12 and generates a radio signal R14 with the increased frequency. The polarization separator 25 supplies the radio signal R14 after the frequency increase to the antenna 24. The antenna 24 radiates the radio signal R14 into space. The counterpart radio apparatus receives and demodulates the radio signal R14, and outputs a data signal D11 obtained by the demodulation.

  Further, the counterpart wireless device modulates the data signal to be transmitted to the wireless device in FIG. 2 and radiates the generated wireless signal R15 to the space. The antenna 24 receives the radio signal R15 and provides it to the polarization separator 25. The polarization separator 25 outputs the radio signal R15 input from the antenna 24 to the down converter 27, outputs the radio signal R14 input from the up converter 23 to the antenna 24, and does not output it to the down converter 27. Designed to. However, when the isolation characteristic of the polarization separator 25 is insufficient, a part of the radio signal R14 (R14 ') input from the upconverter 23 is output to the downconverter 27. Therefore, the radio signal R16 from the polarization separator 25 includes not only the radio signal R15 but also the component R14 'of the radio signal R14.

  The down converter 27 reduces the frequency of the radio signal R16, and generates an IF signal R17 having a frequency after the decrease. The IF signal R17 after the frequency reduction is a radio signal in the intermediate frequency band. When the polarization separation degree of the polarization separator 25 is insufficient, the IF signal R17 output from the down converter 27 includes not only the amount corresponding to the radio signal R15 but also the component R12 'of the IF signal R12.

  On the other hand, the delay line 26 passes the IF signal R13 and delays the phase. The multiplexer 28 combines the IF signal R17 and the IF signal R13 via the delay line 26. The demodulator 29 demodulates the combined IF signal R18 and outputs a data signal D12 obtained by the demodulation. As described above, the difference between the line length from the distributor 22 via the polarization separator 25 to the multiplexer 28 and the line length from the distributor 22 via the delay line 26 to the multiplexer 28 is as follows. Since the wavelength of the IF signal R11 is ½, the IF signal R13 provided to the multiplexer 28 via the delay line 26 and the component R12 ′ of the IF signal R12 included in the IF signal R17 to the multiplexer 28. A phase difference of ½ wavelength, which is the same as the path difference, is generated between and. Thereby, the multiplexer 28 operates so that the component R12 and the IF signal R13 of the IF signal R12 included in the IF signal R17 cancel each other.

  Further, as described above, the distribution ratio of the distributor 22 includes the intensity of the component R12 ′ of the IF signal R12 included in the IF signal R17 and the intensity of the IF signal R13 provided to the multiplexer 28 via the delay line 26. Are determined to be the same, the multiplexer 28 cancels the component R12 ′ of the IF signal R12 and the IF signal R13 included in the IF signal R17.

  As a result, the IF signal R18 corresponds to the radio signal R15, and the data signal D12 becomes equal to the data signal before modulation in the counterpart radio apparatus.

  As described above, according to the second embodiment, even when the polarization separation degree of the polarization separator 25 is insufficient, a data signal can be received, thereby improving the data transmission characteristics. it can. In the second embodiment, the line length from the distributor 22 via the polarization separator 25 to the multiplexer 28 and the line from the distributor 22 via the delay line 26 to the multiplexer 28. Although the difference from the length is ½ of the wavelength of the IF signal R11, such setting is not essential, and at least the component R12 ′ of the IF signal R12 included in the IF signal R17 to the multiplexer 28 and the delay line 26 It is only necessary that a phase difference be generated between the IF signal R13 and the IF signal R13 which is supplied to the multiplexer 28 via the. This is because the multiplexer 28 operates so that at least the component R12 'of the IF signal R12 and the IF signal R13 included in the IF signal R17 cancel each other.

  In the second embodiment, the distribution ratio of the distributor 22 is set so that the intensity of the component R12 ′ of the IF signal R12 included in the IF signal R17 and the intensity of the IF signal R13 given to the multiplexer 28 are the same. However, the strengths may not be the same. This is because the multiplexer 28 operates so that at least the component R12 'of the IF signal R12 and the IF signal R13 included in the IF signal R17 cancel each other if the above-described phase difference occurs.

[Third Embodiment]
FIG. 3 is a block diagram illustrating a configuration of a wireless device according to the third embodiment. The wireless device includes most elements constituting the wireless device according to the second embodiment, and the same reference numerals are given to the elements. Hereinafter, description of such elements will be omitted, and the difference will be mainly described.

  The down converter 27 includes a radio signal amplifier 271 that amplifies the radio signal R16 from the polarization separator 25, and a mixer 272 that outputs the IF signal R17 after the frequency is lowered.

  The radio apparatus detects the intensity of the IF signal amplifier 210 that amplifies the IF signal R13 passing through the delay line 26 and the IF signal amplified by the radio signal amplifier 271, and the radio signal amplifier 271 so that the intensity becomes constant. And an amplification factor control circuit 211 that controls the amplification factor of the IF signal amplifier 210 in accordance with the amplification factor. The IF signal amplifier 210 is arranged between the delay line 26 and the multiplexer 28 as shown, or between the distributor 22 and the delay line 26 (not shown).

  The amplification factor control circuit 211 determines the intensity of the component R12 ′ of the IF signal R12 included in the IF signal R17 output from the mixer 272 and the intensity of the IF signal R13 provided to the multiplexer 28 via the delay line 26. Are controlled so that the amplification factor of IF signal amplifier 210 is the same. Therefore, the distribution ratio of the distributor 22 is arbitrarily set.

  For example, the amplification factor control circuit 211 detects the intensity from the monitor voltage output from the mixer 272, controls the gain adjustment voltage applied to the radio signal amplifier 271 so that the monitor voltage is constant, and also controls the gain adjustment voltage. Based on the above, the gain adjustment voltage applied to the IF signal amplifier 210 is adjusted.

  Similar to the second embodiment, the line length from the distributor 22 via the polarization separator 25 to the multiplexer 28 and the multiplexer 22 via the delay line 26 to the multiplexer 28. The difference from the line length to reach is ½ of the wavelength of the IF signal R11.

  3 transmits and receives radio signals to and from the partner wireless device, similarly to the wireless device of FIG.

  Similarly, in the radio apparatus of FIG. 3, the multiplexer 28 causes the component R12 ′ and the IF signal R13 of the IF signal R12 included in the IF signal R17 to cancel each other by setting the line length difference. Operate.

  Further, as described above, the amplification factor control circuit 211 determines the strength of the component R12 ′ of the IF signal R12 included in the IF signal R17 and the strength of the IF signal R13 given to the multiplexer 28 via the delay line 26. Are controlled so that the amplification factor of IF signal amplifier 210 is the same. Thereby, in the multiplexer 28, the component R12 'of the IF signal R12 and the IF signal R13 included in the IF signal R17 cancel each other.

  As a result, the IF signal R18 corresponds to the radio signal R15, and the data signal D12 becomes equal to the data signal before modulation in the counterpart radio apparatus.

  As described above, according to the third embodiment, even when the polarization separation degree of the polarization separator 25 is insufficient, a data signal can be received, thereby improving the data transmission characteristics. it can. In the third embodiment, the line length from the distributor 22 via the polarization separator 25 to the multiplexer 28 and the delay line 26 from the distributor 22 are the same as in the second embodiment. The difference from the line length to the multiplexer 28 via the half of the wavelength of the IF signal R11 is not required, but at least the IF signal R12 in the IF signal R17 to the multiplexer 28 is not required. It is only necessary that a phase difference be generated between the component R12 ′ and the IF signal R13 supplied to the multiplexer 28 via the delay line 26. Thereby, the multiplexer 28 operates so that at least the component R12 'of the IF signal R12 and the IF signal R13 included in the IF signal R17 cancel each other.

  In the third embodiment, the amplification factor control circuit 211 receives the IF signal supplied to the multiplexer 28 via the intensity of the component R12 ′ of the IF signal R12 included in the IF signal R17 and the delay line 26. Although the amplification factor of the IF signal amplifier 210 is controlled so that the intensity of R13 is the same, the intensity may not be the same. This is because the multiplexer 28 operates so that at least the component R12 'of the IF signal R12 and the IF signal R13 included in the IF signal R17 cancel each other if the above-described phase difference occurs.

It is a block diagram which shows the structure of the radio | wireless apparatus which concerns on 1st Embodiment. It is a block diagram which shows the structure of the radio | wireless apparatus which concerns on 2nd Embodiment. It is a block diagram which shows the structure of the radio | wireless apparatus which concerns on 3rd Embodiment. It is a block diagram which shows the structure of the conventional radio | wireless apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Transmission module 12, 22 ... Divider 13, 24 ... Antenna 14, 25 ... Polarization separator 15, 26 ... Delay line 16, 28 ... Multiplexer 17 ... Reception module 21 ... Modulator 23 ... Up converter 27 ... Down converter 29 ... Demodulator 210 ... IF signal amplifier 271 ... Radio signal amplifier 211 ... Amplification rate control circuit 272 ... Mixer D1, D2, D11, D12 ... Data signal R1, R2, R3, R4, R5, R14, R15, R16 ... Radio signal R11, R12, R13, R17, R18 ... IF signal R1 '... Component of radio signal R1 R2' ... Component of radio signal R2 R12 '... Component of IF signal R12 R14' ... Component of radio signal R14

Claims (8)

A transmission module for generating a radio signal modulated with a data signal;
A distributor for branching the radio signal;
An antenna for transmitting one of the branched radio signals and receiving the radio signal;
A polarization separator that outputs a radio signal input from the antenna to the multiplexer and outputs a radio signal input from the distributor to the antenna;
A delay line for delaying the phase by passing the other radio signal branched;
A multiplexer that multiplexes a radio signal output from the polarization separator and a radio signal via the delay line;
And a receiving module that demodulates the combined radio signal.   The distribution ratio of the distributor is the intensity of the component of the one radio signal included in the radio signal from the polarization separator to the multiplexer and the radio given to the multiplexer via the delay line 2. The radio apparatus according to claim 1, wherein the signal intensity is set to be the same.   A difference between a line length from the distributor via the polarization separator to the multiplexer and a line length from the distributor via the delay line to the multiplexer is given to the distributor. 2. The radio apparatus according to claim 1, wherein the radio apparatus has a wavelength half that of a radio signal to be transmitted. A modulator that generates an IF signal modulated with a data signal;
A distributor for branching the IF signal;
An up-converter that increases the frequency of one of the branched IF signals and generates a radio signal having the increased frequency;
An antenna for transmitting the radio signal after the increase in frequency and receiving the radio signal;
A polarization separator that outputs a radio signal input from the antenna to the down converter and outputs a radio signal input from the up converter to the antenna;
A delay line for delaying the phase by passing the other IF signal branched;
A down converter for reducing the frequency of the radio signal output from the polarization separator and generating an IF signal having the reduced frequency;
A multiplexer that combines the IF signal after the decrease in frequency and the IF signal via the delay line;
A radio apparatus comprising: a demodulator that demodulates the combined IF signal.   The distribution ratio of the distributor is the intensity of the component of the one IF signal included in the IF signal from the down converter to the multiplexer and the IF signal supplied to the multiplexer via the delay line. 5. The wireless device according to claim 4, wherein the wireless devices are determined to have the same strength. The down converter includes a radio signal amplifier that amplifies a radio signal from the polarization separator, and a mixer that outputs an IF signal after the frequency is reduced,
The wireless device includes:
An IF signal amplifier for amplifying an IF signal passing through the delay line;
The intensity of the IF signal output from the mixer is detected, the amplification factor of the radio signal amplifier is controlled so that the intensity becomes constant, and the amplification factor of the IF signal amplifier is controlled according to the amplification factor The wireless device according to claim 4, further comprising an amplification factor control circuit.   In the amplification factor control circuit, the intensity of the one IF signal component included in the IF signal output from the mixer is the same as the intensity of the IF signal applied to the multiplexer via the delay line. The wireless device according to claim 6, wherein:   A difference between a line length from the distributor via the polarization separator to the multiplexer and a line length from the distributor via the delay line to the multiplexer is given to the distributor. The radio apparatus according to claim 4, wherein the radio apparatus has a wavelength half that of the IF signal.

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