JP2014064147A - Radio circuit and control method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for improving antenna characteristics in a radio apparatus performing transmission with one antenna by joining transmission signals in a plurality of frequency bands.SOLUTION: The radio circuit (1) includes a two-way coupler (50) that fetches a traveling wave and a reflection wave, and a variable matching element (30) that varies impedance according to electric power of a traveling wave and a reflection wave for each frequency band detected by detection means (40, 33).

Description

  The present invention relates to a radio circuit and a radio circuit control method.

  In recent years, a wireless device has been developed that combines transmission signals of a plurality of frequency bands and transmits them using a single antenna (Patent Document 1). In Patent Document 1, in a communication device that communicates signals, transmission target signal level changing means for changing the level of a signal that is a transmission target of each channel for each of a plurality of channels, and each of a plurality of channels, respectively. Combines the transmission filter means for filtering the signal of each channel whose level is changed by the transmission target signal level changing means by the filtering characteristic that passes the frequency component of the channel, and the signals of the plurality of channels filtered by the transmission filter means Transmitting signal combining means, an antenna for wirelessly transmitting the signal combined by the transmission signal combining means, and a combined signal distribution means for distributing a part of the combined signal output from the transmission signal combining means to the antenna into a plurality of signals And for each of multiple channels Level detecting filter means for filtering the respective distributed signals distributed by the combined signal distributing means with the same filtering characteristics as the filtering characteristics of the transmission filter means, and for each channel obtained by filtering by the level detecting filter means Based on the signal level detection means for detecting the signal level and the signal level of each channel detected by the signal level detection means, the transmission target signal level changing means determines the level of the signal to be transmitted on each channel. There is described a communication device including transmission target signal level change mode control means for controlling a mode to be changed.

Japanese Patent Laying-Open No. 2005-318212 (published on November 10, 2005)

  However, although the above-described conventional techniques detect the transmission signal level of each frequency band and adjust the transmission signal level of each transmission system, there is a problem that no consideration is given to antenna characteristics.

  The present invention has been made in view of the above problems, and mainly provides a technique for improving antenna characteristics in a radio apparatus that combines transmission signals of a plurality of frequency bands and transmits the signals using a single antenna. Objective.

  In order to solve the above problems, a wireless circuit according to one embodiment of the present invention includes a plurality of transmission signal output units that output transmission signals in different frequency bands, and a transmission signal output from the plurality of transmission signal output units. A coupling means for coupling and outputting to the antenna, a bidirectional coupler connected between the antenna and the plurality of transmission signal output units for extracting traveling waves and reflected waves, and transmission signals of a plurality of frequency bands simultaneously Detection means for detecting the power of the traveling wave and the reflected wave taken out by the bidirectional coupler for each frequency band when output to the antenna, and between the antenna and the bidirectional coupler A variable matching means connected to the antenna and configured to change the impedance of the antenna in accordance with the power of the traveling wave and the reflected wave for each frequency band detected by the detection means. It is characterized in.

  In the wireless circuit according to one aspect of the present invention, the variable matching unit calculates a power ratio between the traveling wave and the reflected wave in at least one frequency band for each frequency band, and the calculated power in each frequency band. The impedance of each frequency band of the antenna may be adjusted according to the ratio.

  In the wireless circuit according to one aspect of the present invention, the bidirectional coupler may be connected between the variable matching unit and the coupling unit.

  A wireless circuit according to an aspect of the present invention includes a plurality of the bidirectional couplers, and each of the plurality of bidirectional couplers is provided between the coupling unit and the plurality of transmission signal output units. In addition, it may be connected to each transmission signal output unit.

  In the wireless circuit according to one embodiment of the present invention, the plurality of bidirectional couplers may be connected in series so that the traveling waves and the reflected waves extracted from each other are respectively coupled. Good.

  In the radio circuit according to one aspect of the present invention, the detection means includes a plurality of detectors to which the traveling wave and the reflected wave extracted by each of the plurality of bidirectional couplers are respectively input. It may be.

  In the wireless circuit according to one aspect of the present invention, the detection unit detects at least one of the power of the traveling wave or the reflected wave in the frequency band of the transmission signal output from any of the plurality of transmission signal output units. Each of the one or more sub-detecting means is input with the traveling wave or the reflected wave including a plurality of frequency bands extracted by the bidirectional coupler, A filter that transmits only the traveling wave or the reflected wave in the frequency band to be, and a detector that detects the power of the traveling wave or the reflected wave that has passed through the filter. .

  In the wireless circuit according to one aspect of the present invention, the detection unit detects total power of all frequency bands during transmission of the traveling wave or the reflected wave extracted by the bidirectional coupler. May be further provided.

  In the wireless circuit according to one aspect of the present invention, the detection unit subtracts the power detected by the at least one sub-detection unit from the total power detected by the total power detection unit. The power of the traveling wave or the reflected wave in a frequency band different from any of the detection means may be calculated.

  In the radio circuit according to one aspect of the present invention, the plurality of transmission signal output units include a first variable frequency transmission signal output unit in which a frequency band of a transmission signal to be output is variable. The two sub-detecting means respectively detect the power of the traveling wave or the reflected wave in the frequency band of the transmission signal output from each of the plurality of transmission signal output units excluding the first variable frequency transmission signal output unit. And the first variable frequency transmission signal output unit outputs the detection means by subtracting the power detected by the at least one sub-detection means from the total power detected by the total power detection means. The power of the traveling wave or the reflected wave in the frequency band of the transmission signal may be calculated.

  In the wireless circuit according to one aspect of the present invention, the plurality of transmission signal output units include a second variable frequency transmission signal output unit in which a frequency band of a transmission signal to be output is variable. The above sub-detection means includes variable frequency detection means for detecting the power of the traveling wave or the reflected wave in the frequency band of the transmission signal output from the second variable frequency transmission signal output unit. The filter provided in the frequency detection means is configured to change the frequency band transmitted by the own filter in accordance with the change in the frequency band of the transmission signal output from the second variable frequency transmission signal output unit. Also good.

  A radio circuit according to an aspect of the present invention includes a control unit that controls transmission power of the plurality of transmission signal output units according to power of the traveling wave for each frequency band detected by the detection unit, The control means may be configured to control the variable matching means in accordance with the traveling wave and the reflected wave power for each frequency band detected by the detection means.

  A wireless device according to one embodiment of the present invention includes the wireless circuit according to one embodiment of the present invention.

  A radio circuit control method according to an aspect of the present invention is a radio circuit control method including a plurality of transmission signal output units, a coupling unit, a bidirectional coupler, a detection unit, and a variable matching unit, An output step in which the plurality of transmission signal output units respectively output transmission signals in different frequency bands; a combining step in which the combining means combines the transmission signals output in the output step and outputs the combined signals to the antenna; The bidirectional coupler connected between the transmission signal output unit and the plurality of transmission signal output units, when the traveling wave and the reflected wave are extracted, and when transmission signals of a plurality of frequency bands are simultaneously output to the antenna And a detecting step for detecting the power of the traveling wave and the reflected wave taken out by the bidirectional coupler for each frequency band, and a connection between the antenna and the bidirectional coupler. The impedance of the variable matching means which is characterized in that it includes a variable step of changing in response to the power of the traveling wave and the reflected wave of each frequency band detected at 該検 wave process.

  According to one aspect of the present invention, in a situation where transmission signals of a plurality of frequency bands are simultaneously transmitted, a reflected wave is extracted in addition to a traveling wave by a bidirectional coupler, and the traveling wave and the reflected wave are detected by a detecting unit. Since power can be detected for each frequency band, antenna matching can be adjusted according to the power of the traveling wave and reflected wave for each frequency band, and the antenna characteristics can be improved.

It is a schematic diagram which shows schematic structure of the radio | wireless circuit which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows schematic structure of the radio | wireless circuit which concerns on Embodiment 2 of this invention. It is a schematic diagram which shows schematic structure of the radio | wireless circuit which concerns on Embodiment 3 of this invention. It is a schematic diagram which shows schematic structure of the radio | wireless circuit which concerns on Embodiment 4 of this invention. It is a schematic diagram which shows schematic structure of the radio | wireless circuit which concerns on Embodiment 5 of this invention. It is a schematic diagram which shows schematic structure of the radio | wireless circuit which concerns on Embodiment 6 of this invention. It is a schematic diagram which shows schematic structure of the radio | wireless circuit which concerns on Embodiment 7 of this invention. It is a schematic diagram which shows schematic structure of the radio | wireless circuit which concerns on Embodiment 8 of this invention. It is a schematic diagram which shows schematic structure of the radio | wireless circuit which concerns on Embodiment 9 of this invention. It is a schematic diagram which shows schematic structure of the radio | wireless circuit which concerns on Embodiment 10 of this invention. It is a schematic diagram which shows schematic structure of the radio | wireless circuit which concerns on Embodiment 11 of this invention.

Embodiment 1
Hereinafter, embodiments of the present invention will be described in detail. Hereinafter, a radio circuit according to an embodiment of the present invention will be described. The radio circuit is a radio circuit (transmission system radio circuit) for processing a transmission signal, and can be incorporated in a radio apparatus.

  In one embodiment of the present invention, the radio circuit 1 is connected to an antenna 20, as shown in FIG. 1, and includes a variable matching element (variable matching means) 30, n traveling wave detectors (sub-detecting means, Detection means) 40, n reflected wave detection units (sub-detection means, detection means) 45, bidirectional coupler 50, multiplexer (coupling means) 60, n amplifiers 70, and RFIC 80. The variable matching element 30 includes a variable capacitance element 31, a variable matching element controller 32, and a calculation unit (calculation means) 33. The traveling wave detection unit 40 includes a filter 41 and a detector 42. The reflected wave detection unit 45 includes a filter 46 and a detector 47. The RFIC 80 includes n transmission signal output units 85.

  A variable matching element 30 that matches the impedance of the antenna 20 is connected to the antenna 20. The variable matching element 30 can adjust the impedance of the antenna 20 by the variable matching element controller 32 controlling the variable capacitance element 31 according to the calculation result in the calculation unit 33. However, the configuration of the variable matching element 30 is not limited to this, as long as the impedance of the antenna 20 can be adjusted.

  The n transmission signal output units 85 output transmission signals in different frequency bands (bands 1 to n), and each transmission signal is amplified by the amplifier 70 and then combined by the multiplexer 60. The Then, the combined transmission signal is transmitted from one antenna 20. That is, transmission signals in a plurality of frequency bands are output from the multiplexer 60 to the antenna 20 at the same time and transmitted from the antenna 20. At this time, the traveling wave of the entire transmission band travels from the multiplexer 60 to the variable matching element 30, and the reflected wave of the entire transmission band returns from the variable matching element 30 to the multiplexer 60.

  The bidirectional coupler 50 is a directional coupler that performs bidirectional output. The bidirectional coupler 50 is connected between the variable matching element 30 and the multiplexer 60, and a traveling wave and a part of the reflected wave are extracted to travel the traveling wave. The wave detection unit 40 is connected to each traveling wave detection unit 40 and the reflection wave detection unit 45 so that the reflected wave is input to the reflection wave detection unit 45. The traveling wave and the reflected wave extracted by the bidirectional coupler 50 each include the entire transmission band.

  The n traveling wave detectors 40 detect traveling wave power in different frequency bands (bands 1 to n). In particular, it is preferable that the frequency bands detected by the n traveling wave detection units 40 respectively correspond to the frequency bands of the transmission signals output by the n transmission signal output units 85.

  The filter 41 is, for example, a bandpass filter, and is configured to transmit only a frequency band to be detected from a traveling wave including a plurality of frequency bands. The detector 42 is, for example, an ADC (analog-digital converter), and outputs the traveling wave power of a specific frequency band that has passed through the filter 41 to the arithmetic unit 33 as a digital value. Thereby, the calculating part 33 can detect the electric power of a traveling wave for every frequency band.

  Similarly, the n reflected wave detectors 45 detect the power of reflected waves in different frequency bands (bands 1 to n). In particular, the frequency bands detected by the n reflected wave detection units 45 preferably correspond to the frequency bands of the transmission signals output by the n transmission signal output units 85, respectively.

  The filter 46 is, for example, a band pass filter, and is configured to transmit only a frequency band to be detected from a traveling wave including a plurality of frequency bands. The detector 47 is, for example, an ADC (analog-digital converter), and outputs the traveling wave power of a specific frequency band that has passed through the filter 46 to the arithmetic unit 33 as a digital value. Thereby, the calculating part 33 can detect the electric power of a reflected wave for every frequency band.

  As described above, the calculation unit 33 includes a traveling wave and a reflected wave for each frequency band (preferably, for each frequency band corresponding to the frequency band of the transmission signal output by the n transmission signal output units 85). Power is input. Thereby, the calculation part 33 can calculate the power ratio (typically VSWR) of the traveling wave and the reflected wave for each frequency band. Since the power ratio of the traveling wave and the reflected wave can be used as an index of antenna matching, the variable matching element controller 32 controls the variable capacitance element 31 according to the power ratio, thereby improving the characteristics of the antenna 20. can do.

  For example, in one embodiment, the variable matching element controller 32 changes the adjustment amount of the impedance of the antenna 20 by the variable matching element 30 (adjustment amount changing step), and as a result, a specific frequency band calculated by the calculation unit 33 or It may be determined how the overall VSWR changes (VSWR determination step), and the variable matching element 30 may be controlled such that a specific frequency band or the overall VSWR is lowered. The method of controlling the variable matching element 30 by the variable matching element controller 32 in the adjustment amount changing step is not particularly limited, and control may be performed so that the impedance of the antenna 20 changes continuously. A plurality of predetermined control parameters may be stored, and the variable matching element 30 may be controlled with a control parameter selected from the plurality of control parameters. That is, the variable matching element 30 may be controlled using the control parameter with the greatest improvement in VSWR after the adjustment amount changing step and the VSWR determining step are repeated a plurality of times while changing the control parameter. Moreover, the specific frequency band should just be suitably selected according to the objective, such as a frequency band corresponding to an important transmission signal, for example.

[Embodiment 2]
Another embodiment of the present invention will be described in detail. For convenience of explanation, members having the same functions as those in the drawings described in the embodiment are given the same reference numerals, and descriptions thereof are omitted.

  In the embodiment of the present invention, as shown in FIG. 2, the wireless circuit 2 includes one bidirectional coupler 50 between the variable matching element 30 and the multiplexer 60 as compared with the wireless circuit 1 of the first embodiment. Each of the plurality of bidirectional couplers 50 is connected to each transmission signal output unit 85 between the multiplexer 60 and the plurality of transmission signal output units 85 (amplifier 70). . The plurality of bidirectional couplers 50 are connected in series so that the traveling waves and the reflected waves taken out from each other are coupled to each other (a so-called daisy chain).

  Even in this case, each transmission signal output from the n transmission signal output units 85 is amplified by the amplifier 70 and then combined by the multiplexer 60 as in the first embodiment. Then, the combined transmission signal is transmitted from one antenna 20. Further, the traveling wave and the reflected wave of each frequency band taken out by each bidirectional coupler 50 are combined by the direct connection described above, and the traveling wave of the entire transmission band is input to the traveling wave detector 40, The reflected wave in the transmission band is input to the reflected wave detector 45.

  In the present embodiment, since a plurality of bidirectional couplers 50 are required, the circuit scale becomes larger than that in the first embodiment. However, the antenna characteristics can be improved more suitably. This is because the multiplexer 60 is typically configured by a filter, and the loss in the multiplexer 60 may be increased or decreased by adjusting the impedance of the antenna 20 by the variable matching element 30. Therefore, in the first embodiment, even if the characteristics are improved in the portion on the antenna 20 side from the bidirectional coupler 50, the characteristics may be slightly degraded by the multiplexer 60. On the other hand, in this embodiment, since the variable matching element 30 adjusts the impedance of the antenna 20 using the reflected wave after passing through the multiplexer 60, the final characteristics are improved by taking the loss in the multiplexer 60 into consideration. be able to.

[Embodiment 3]
Another embodiment of the present invention will be described in detail. For convenience of explanation, members having the same functions as those in the drawings described in the embodiment are given the same reference numerals, and descriptions thereof are omitted.

  In one embodiment of the present invention, as shown in FIG. 3, the radio circuit 3 is provided with only n−1 traveling wave detection units 40 and reflected wave detection units 45 as compared with the radio circuit 1 of the first embodiment. It is not done. For example, when the bands of the transmission signals output from the n transmission signal output units 85 are defined as bands 1 to n, the traveling wave detection unit 40 and the reflected wave detection unit 45 are the traveling waves in the bands 1 to n−1 and The power of the reflected wave is detected, but the power of the traveling wave and the reflected wave in the band n is not detected. Then, the traveling wave total that is connected to the bidirectional coupler 50 without passing through the filter and detects the total power of the traveling waves in all frequency bands (bands 1 to n) being transmitted extracted by the bidirectional coupler 50. It is connected to the power detector 43 and the bidirectional coupler 50 without passing through a filter, and detects the total power of the reflected waves in all frequency bands (bands 1 to n) being transmitted, which are extracted by the bidirectional coupler 50. And a reflected wave total power detection unit 48 is provided. It should be noted that all frequency bands being transmitted (total transmission bands) in a situation where transmission signals of a plurality of frequency bands are simultaneously transmitted from the antenna 20 (a situation where transmission signals of a plurality of frequency bands are simultaneously output to the antenna 20). , A band obtained by combining all of the plurality of frequency bands.

  Here, the calculation unit 33 calculates the traveling wave power in the bands 1 to n−1 detected by the n−1 traveling wave detection units 40 from the total traveling wave power detected by the traveling wave total power detection unit 43. By subtracting, the traveling wave power in the band n can be calculated. Similarly, the calculation unit 33 calculates the power of the reflected waves in the bands 1 to n−1 detected by the n−1 reflected wave detection units 45 from the total power of the reflected waves detected by the reflected wave total power detection unit 48. By subtracting, the power of the reflected wave in the band n can be calculated.

  As a result, even if the number of filters is reduced by two, the same operation as that of the first embodiment can be performed, so that the circuit scale can be reduced.

[Embodiment 4]
Another embodiment of the present invention will be described in detail. For convenience of explanation, members having the same functions as those in the drawings described in the embodiment are given the same reference numerals, and descriptions thereof are omitted. As shown in FIG. 4, the radio circuit 4 has a configuration in which a traveling wave total power detection unit 43 and a reflected wave total power detection unit 48 are provided in the radio circuit 2 of the second embodiment as in the third embodiment. . Accordingly, even if the number of filters is reduced by two, the same operation as that of the second embodiment can be performed, so that the circuit scale can be reduced.

[Embodiment 5]
Another embodiment of the present invention will be described in detail. For convenience of explanation, members having the same functions as those in the drawings described in the embodiment are given the same reference numerals, and descriptions thereof are omitted.

  In one embodiment of the present invention, as shown in FIG. 5, the radio circuit 5 includes m transmission signal output units in addition to the n transmission signal output units 85 compared to the radio circuit 1 of the first embodiment. (Variable frequency transmission signal output unit) 86 is provided. The transmission signals (bands n + 1 to n + m) output from the m transmission signal output units 86 are each amplified by the amplifier 70 and then selected by the switch unit (variable frequency transmission signal output unit) 90. Thus, the signal is input to the multiplexer 60. In addition to the n traveling wave detection units 40 and the reflected wave detection unit 45, a traveling wave variable frequency detection unit 44 and a reflected wave variable frequency detection unit 49 are provided.

  The traveling wave variable frequency detector 44 includes m filters 41 and detectors 42 respectively corresponding to the frequency bands (bands n + 1 to n + m) of the transmission signals output from the m transmission signal output units 86, and switches The connection between the filter 41 and the detector 42 is switched so that the filter 41 that transmits the frequency band of the transmission signal selected in the unit 90 is connected to the detector 42. The switching of the connection and the switching in the switch unit 90 may be performed by a control signal from the RFIC 80, for example. Similarly, the reflected wave variable frequency detection unit 49 includes m filters 46 and detectors 47 respectively corresponding to the frequency bands of the transmission signals output from the m transmission signal output units 86. The connection between the filter 46 and the detector 47 is switched so that the filter 46 that transmits the frequency band of the selected transmission signal is connected to the detector 42. The switching of the connection and the switching in the switch unit 90 may be performed by a control signal from the RFIC 80, for example.

  As described above, the traveling wave variable frequency detection unit 44 and the reflected wave variable frequency detection unit 49, when a part of the transmission signal output unit outputs a transmission signal having a variable frequency band, advance in the frequency band of the transmission signal. The power of waves and reflected waves can be detected successfully.

[Embodiment 6]
Another embodiment of the present invention will be described in detail. For convenience of explanation, members having the same functions as those in the drawings described in the embodiment are given the same reference numerals, and descriptions thereof are omitted. As shown in FIG. 6, the radio circuit 6 is different from the radio circuit 2 of the second embodiment in that m transmission signal output units 86, a switch unit 90, a traveling wave variable frequency detection unit 44, and The reflected wave variable frequency detection unit 49 is provided. Thereby, when a part of the transmission signal output unit outputs a transmission signal having a variable frequency band, it is possible to successfully detect the power of the traveling wave and the reflected wave in the frequency band of the transmission signal.

[Embodiment 7]
Another embodiment of the present invention will be described in detail. For convenience of explanation, members having the same functions as those in the drawings described in the embodiment are given the same reference numerals, and descriptions thereof are omitted.

  In one embodiment of the present invention, as shown in FIG. 7, the wireless circuit 7 travels in place of the traveling wave variable frequency detection unit 44 and the reflected wave variable frequency detection unit 49, as compared with the wireless circuit 5 of the fifth embodiment. A total wave power detection unit 43 and a total reflection wave power detection unit 48 are provided.

  Here, the calculation unit 33 subtracts the traveling wave power detected by the n traveling wave detection units 40 from the total power of traveling waves in all transmission bands detected by the traveling wave total power detection unit 43, The traveling wave power in the frequency band of the transmission signal output from any of the m transmission signal output units 86 via the switch unit 90 can be calculated. Similarly, the calculation unit 33 subtracts the power of the reflected waves detected by the n reflected wave detection units 45 from the total power of the reflected waves of all transmission bands detected by the reflected wave total power detection unit 48, The power of the reflected wave in the frequency band of the transmission signal output from any of the m transmission signal output units 86 via the switch unit 90 can be calculated.

  Thereby, even if the complicated mechanisms such as the traveling wave variable frequency detection unit 44 and the reflected wave variable frequency detection unit 49 in the fifth embodiment are eliminated and the number of filters is greatly reduced, the same operation as in the fifth embodiment can be performed. Therefore, the circuit scale can be reduced.

  The fifth embodiment and the seventh embodiment may be combined.

[Embodiment 8]
Another embodiment of the present invention will be described in detail. For convenience of explanation, members having the same functions as those in the drawings described in the embodiment are given the same reference numerals, and descriptions thereof are omitted. As shown in FIG. 8, the radio circuit 8 is different from the radio circuit 6 of the sixth embodiment in the total of traveling waves instead of the traveling wave variable frequency detection unit 44 and the reflected wave variable frequency detection unit 49 as in the seventh embodiment. In this configuration, a power detection unit 43 and a reflected wave total power detection unit 48 are provided. Thereby, even if the complicated mechanisms such as the traveling wave variable frequency detection unit 44 and the reflected wave variable frequency detection unit 49 in the sixth embodiment are eliminated and the number of filters is greatly reduced, the same operation as in the sixth embodiment can be performed. Therefore, the circuit scale can be reduced.

  The sixth embodiment and the eighth embodiment may be combined.

[Embodiment 9]
Another embodiment of the present invention will be described in detail. For convenience of explanation, members having the same functions as those in the drawings described in the embodiment are given the same reference numerals, and descriptions thereof are omitted.

  In one embodiment of the present invention, as shown in FIG. 9, the radio circuit 9 has outputs from the traveling wave detection unit 40 and the reflected wave detection unit 45 that are variable matching elements as compared with the radio circuit 1 of the first embodiment. The calculation unit 83 calculates the power ratio of the traveling wave and the reflected wave for each frequency, and is input to the calculation unit 83 of the RFIC (control means) 80 instead of the calculation unit 33 of 30. The variable matching element controller 82 of the RFIC 80 controls the variable matching element 35.

  Here, the RFIC 80 controls the transmission power of the transmission signal output unit 85 according to the traveling wave power for each frequency band detected by the traveling wave detection unit 40. For this reason, wiring for control from the RFIC 80 to the variable matching element 35 is required, but wiring for controlling transmission power and wiring for controlling the variable matching element 35 can be partially shared. . Thereby, the circuit scale can be reduced.

  The ninth embodiment may be combined with at least one of the third, fifth, and seventh embodiments.

[Embodiment 10]
Another embodiment of the present invention will be described in detail. For convenience of explanation, members having the same functions as those in the drawings described in the embodiment are given the same reference numerals, and descriptions thereof are omitted. As shown in FIG. 10, the radio circuit 10 has outputs from the traveling wave detection unit 40 and the reflected wave detection unit 45 of the variable matching element 30 as compared to the radio circuit 2 of the second embodiment as in the ninth embodiment. The calculation unit 83 is input to the calculation unit 83 of the RFIC (control means) 80 instead of the calculation unit 33, and the calculation unit 83 calculates the power ratio of the traveling wave and the reflected wave for each frequency, and according to the power ratio, the RFIC 80 The variable matching element controller 82 controls the variable matching element 35. As a result, wiring for control from the RFIC 80 to the variable matching element 35 is required, but it is possible to share part of the wiring for controlling the transmission power and the wiring for controlling the variable matching element 35. it can. Thereby, the circuit scale can be reduced.

  Note that Embodiment 10 may be combined with at least one of Embodiments 4, 6, and 8.

[Embodiment 11]
Another embodiment of the present invention will be described in detail. For convenience of explanation, members having the same functions as those in the drawings described in the embodiment are given the same reference numerals, and descriptions thereof are omitted.

  In one embodiment of the present invention, as shown in FIG. 11, the bidirectional coupler 50 is not connected to the wireless circuit 11 in series as compared to the wireless circuit 10 of the tenth embodiment. Traveling waves and reflected waves in different frequency bands (bands 1 to n) taken out by the coupler 50 are directly input to each detector 42 or each detector 47.

  Even with such a configuration, the detector 42 and the detector 47 can detect a traveling wave and a reflected wave for each frequency band, and thus can operate in the same manner as in the tenth embodiment. As a result, the line routing distance increases, but the number of filters can be reduced, so that the circuit scale can be reduced.

[Summary]
A wireless circuit according to one embodiment of the present invention includes a plurality of transmission signal output units that output transmission signals of different frequency bands, and a combination that combines the transmission signals output from the plurality of transmission signal output units and outputs the combined signals to an antenna Means (multiplexer 60), a bidirectional coupler connected between the antenna and the plurality of transmission signal output units for extracting traveling waves and reflected waves, and transmission signals of a plurality of frequency bands are simultaneously output to the antenna. Detecting means (traveling wave detection unit 40, reflected wave detection unit 45, calculation unit 33 or calculation) for detecting the power of the traveling wave and reflected wave taken out by the bidirectional coupler for each frequency band. Part 83), and the impedance of the antenna according to the power of the traveling wave and the reflected wave for each frequency band detected between the antenna and the bidirectional coupler and detected by the detection means It is characterized in that it comprises variable matching means adapted to vary the scan (variable matching element 30 or the variable matching element 35), the.

  According to the above configuration, in a situation where transmission signals of a plurality of frequency bands are simultaneously transmitted, the reflected wave is taken out in addition to the traveling wave by the bidirectional coupler, and the power of the traveling wave and the reflected wave is obtained by the detecting means. Since detection can be performed for each frequency band, the antenna characteristics can be improved by adjusting the matching of the antenna according to the power of the traveling wave and the reflected wave for each frequency band.

  Furthermore, in the wireless circuit according to one aspect of the present invention, the variable matching unit calculates a power ratio between the traveling wave and the reflected wave in at least one frequency band, and the antenna is configured according to the calculated power ratio. It is preferable to adjust the impedance.

  According to said structure, since the power ratio of a traveling wave and a reflected wave, for example, VSWR can be calculated, antenna matching can be improved suitably according to the said power ratio.

  Furthermore, in the wireless circuit according to one aspect of the present invention, the bidirectional coupler may be connected between the variable matching unit and the coupling unit.

  According to said structure, since it is not necessary to provide a bidirectional coupler for every transmission signal output part, a circuit scale can be made small.

  Furthermore, the wireless circuit according to one embodiment of the present invention includes a plurality of the bidirectional couplers, and each of the plurality of bidirectional couplers includes the coupling unit and the plurality of transmission signal output units. Between these, the structure connected for every transmission signal output part may be sufficient.

  According to said structure, since the impedance of an antenna can be adjusted in consideration of the loss in a coupling means, an antenna characteristic can be improved suitably.

  Further, in the wireless circuit according to one embodiment of the present invention, the plurality of bidirectional couplers are configured to be connected in series so that the traveling waves extracted from each other and the reflected waves are coupled to each other. May be.

  According to the above configuration, the wiring can be simplified.

  Furthermore, in the radio circuit according to one aspect of the present invention, the detection unit includes a plurality of detectors to which the traveling wave and the reflected wave extracted by each of the plurality of bidirectional couplers are respectively input. It may be a configuration.

  According to said structure, the number of required filters can be reduced.

  Furthermore, in the wireless circuit according to one aspect of the present invention, the detection unit is configured to detect power of the traveling wave or the reflected wave in a frequency band of a transmission signal output from any of the plurality of transmission signal output units. Two or more sub detection means (traveling wave detection unit 40, reflected wave detection unit 45) are provided, and each of the one or more sub detection units has a plurality of frequency bands extracted by the bidirectional coupler. A filter that receives the traveling wave or the reflected wave that is included and transmits only the traveling wave or the reflected wave in the frequency band to be detected, and detects the power of the traveling wave or the reflected wave that has passed through the filter The detector may be provided.

  According to said structure, a detection means can detect the electric power of the traveling wave or reflected wave for every frequency band suitably.

  Further, in the wireless circuit according to one aspect of the present invention, the detection unit detects total power of all frequency bands during transmission of the traveling wave or the reflected wave extracted by the bidirectional coupler. The detection means (traveling wave total power detection unit 43, reflected wave total power detection unit 48) may further be provided, and the detection unit may use at least the above-mentioned total power detected by the total power detection unit. The power of the traveling wave or the reflected wave in a frequency band different from any of the at least one sub-detecting means is calculated by subtracting the power detected by one sub-detecting means. Also good.

  According to said structure, the number of required filters can be reduced.

  Furthermore, in the wireless circuit according to one aspect of the present invention, the plurality of transmission signal output units include a first variable frequency transmission signal output unit (transmission signal output unit 86, which has a variable frequency band of the transmission signal to be output). A switch unit 90), wherein the at least one sub-detecting means is configured to perform the progression in the frequency band of the transmission signal output from each of the plurality of transmission signal output units excluding the first variable frequency transmission signal output unit. Each of the waves or the reflected wave is detected, and the detection means subtracts the power detected by the at least one sub-detection means from the total power detected by the total power detection means. The configuration is such that the power of the traveling wave or the reflected wave in the frequency band of the transmission signal output from the first variable frequency transmission signal output unit is calculated. It may be.

  According to said structure, it can respond also when the frequency band of the transmission signal to output is variable, and can reduce the number of required filters significantly.

  Furthermore, in the wireless circuit according to one aspect of the present invention, the plurality of transmission signal output units include a second variable frequency transmission signal output unit (transmission signal output unit 86, which has a variable frequency band of the transmission signal to be output). A switch unit 90), and the one or more sub-detecting means detects the power of the traveling wave or the reflected wave in the frequency band of the transmission signal output from the second variable frequency transmission signal output unit. Variable frequency detection means (traveling wave variable frequency detection unit 44 and reflected wave variable frequency detection unit 49) are included, and a filter included in the variable frequency detection unit is output by the second variable frequency transmission signal output unit. The configuration may be such that the frequency band transmitted by the own filter is changed in accordance with the change in the frequency band of the transmission signal.

  According to said structure, it can respond also when the frequency band of the transmission signal to output is variable.

  Further, in the radio circuit according to one aspect of the present invention, a control unit (RFIC80) that controls transmission power of the plurality of transmission signal output units according to the power of the traveling wave for each frequency band detected by the detection unit. The control means may be configured to control the variable matching means according to the power of the traveling wave and the reflected wave for each frequency band detected by the detection means.

  According to the above configuration, the wiring for controlling the transmission power and the wiring for controlling the variable matching means can be partially shared.

  A wireless device according to one embodiment of the present invention includes the wireless circuit according to one embodiment of the present invention.

  According to said structure, there exists an effect that the antenna characteristic in a radio | wireless apparatus can be improved.

  A radio circuit control method according to an aspect of the present invention is a radio circuit control method including a plurality of transmission signal output units, a coupling unit, a bidirectional coupler, a detection unit, and a variable matching unit. The transmission signal output unit outputs a transmission signal in a different frequency band, and the combining unit combines the transmission signal output in the output step and outputs the combined signal to an antenna, the antenna and the antenna The bidirectional coupler connected between a plurality of transmission signal output units takes out a traveling wave and a reflected wave, and when transmission signals of a plurality of frequency bands are simultaneously output to the antenna, The detection means is connected between the antenna and the bidirectional coupler, and a detection step of detecting the power of the traveling wave and the reflected wave extracted by the bidirectional coupler for each frequency band. The adjustment amount of the impedance of the antenna by the variable matching means, is characterized in that it includes a variable step of changing in response to the power of the traveling wave and the reflected wave of each frequency band detected at 該検 wave process.

  According to said method, there exists an effect equivalent to the radio | wireless circuit which concerns on 1 aspect of this invention.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

[Example of software implementation]
Finally, each block of the radio circuits 1 to 11, in particular, the calculation unit 33, the calculation unit 83, the variable matching element controller 32, and the variable matching element controller 82 are hardware by a logic circuit formed on an integrated circuit (IC chip). Alternatively, it may be realized by software, or may be realized by software using a CPU (Central Processing Unit).

  In the latter case, the radio circuits 1 to 11 include a CPU that executes instructions of a program that realizes each function, a ROM (Read Only Memory) that stores the program, a RAM (Random Access Memory) that expands the program, and the program And a storage device (recording medium) such as a memory for storing various data. An object of the present invention is a recording medium in which program codes (execution format program, intermediate code program, source program) of a control program for the radio circuits 1 to 11 which are software for realizing the functions described above are recorded so as to be readable by a computer. Can also be achieved by reading the program code recorded on the recording medium and executing it by the computer (or CPU or MPU).

  Examples of the recording medium include non-transitory tangible medium, such as magnetic tape and cassette tape, magnetic disk such as floppy (registered trademark) disk / hard disk, and CD-ROM / MO. Discs including optical discs such as / MD / DVD / CD-R, cards such as IC cards (including memory cards) / optical cards, semiconductor memories such as mask ROM / EPROM / EEPROM (registered trademark) / flash ROM Alternatively, logic circuits such as PLD (Programmable Logic Device) and FPGA (Field Programmable Gate Array) can be used.

  The wireless circuits 1 to 11 may be configured to be connectable to a communication network, and the program code may be supplied via the communication network. The communication network is not particularly limited as long as it can transmit the program code. For example, the Internet, intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication network, and the like can be used. The transmission medium constituting the communication network may be any medium that can transmit the program code, and is not limited to a specific configuration or type. For example, even with wired lines such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, ADSL (Asymmetric Digital Subscriber Line) line, infrared rays such as IrDA and remote control, Bluetooth (registered trademark), IEEE 802.11 wireless, HDR ( It can also be used by radio such as High Data Rate (NFC), Near Field Communication (NFC), Digital Living Network Alliance (DLNA), mobile phone network, satellite line, and digital terrestrial network. The present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.

  The present invention can be used in the field of manufacturing wireless devices.

1 to 11 Radio circuit 20 Antenna 30 Variable matching element (variable matching means)
31 Variable Capacitance Element 32 Variable Matching Element Controller 33 Operation Unit 40 Traveling Wave Detection Unit (Sub-Detection Means)
41 Filter 42 Detector 43 Traveling Wave Total Power Detection Unit (Total Power Detection Means)
44 Traveling wave variable frequency detection unit (variable frequency detection means)
45 Reflected wave detection section (sub detection means)
46 Filter 47 Detector 48 Reflected wave total power detection section (total power detection means)
49 Reflected wave variable frequency detector (variable frequency detection means)
50 Bidirectional coupler 60 Multiplexer (coupling means)
70 Amplifier 80 RFIC (control means)
82 Variable Matching Element Controller 83 Calculation Unit 85 Transmission Signal Output Unit 86 Transmission Signal Output Unit (Variable Frequency Transmission Signal Output Unit)
90 switch section (variable frequency transmission signal output means)

Claims (5)

A plurality of transmission signal output units for outputting transmission signals of different frequency bands;
Coupling means for combining the transmission signals output from the plurality of transmission signal output units and outputting the combined signals to the antenna;
A bidirectional coupler connected between the antenna and the plurality of transmission signal output units to extract traveling waves and reflected waves;
Detection means for detecting the power of the traveling wave and the reflected wave extracted by the bidirectional coupler for each frequency band when transmission signals of a plurality of frequency bands are simultaneously output to the antenna, and the antenna Is connected between the antenna and the bidirectional coupler, and the impedance of the antenna is changed according to the power of the traveling wave and the reflected wave for each frequency band detected by the detection means. Means for providing a wireless circuit.   The variable matching means calculates a power ratio between the traveling wave and the reflected wave in at least one frequency band for each frequency band, and according to the calculated power ratio of each frequency band, The radio circuit according to claim 1, wherein the impedance is adjusted.   The radio circuit according to claim 1 or 2, wherein the bidirectional coupler is connected between the variable matching means and the coupling means. The detection means includes one or more sub-detection means for detecting the power of the traveling wave or the reflected wave in the frequency band of the transmission signal output by any of the plurality of transmission signal output units,
Each of the one or more sub-detection means includes
A filter that receives the traveling wave or the reflected wave including a plurality of frequency bands extracted by the bidirectional coupler, and transmits only the traveling wave or the reflected wave in a frequency band to be detected;
The wireless circuit according to claim 1, further comprising: a detector that detects electric power of the traveling wave or the reflected wave that has passed through the filter. A control method of a radio circuit comprising a plurality of transmission signal output units, coupling means, bidirectional coupler, detection means and variable matching means,
An output step in which the plurality of transmission signal output units respectively output transmission signals of different frequency bands;
A combining step in which the combining means combines the transmission signals output in the output step and outputs the combined signals to the antenna;
A step of taking out the traveling wave and the reflected wave by the bidirectional coupler connected between the antenna and the plurality of transmission signal output units;
The detection means is connected between the antenna and the bidirectional coupler, and a detection step of detecting the power of the traveling wave and the reflected wave extracted by the bidirectional coupler for each frequency band. A variable step of changing the amount of adjustment of the impedance of the antenna by the variable matching means according to the traveling wave and the power of the reflected wave for each frequency band detected in the detection step is included. Radio circuit control method.

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