JP6033667B2 - Antenna characteristics tuning system - Google Patents

Description

  The present invention relates to an antenna characteristic tuning system.

  As a wireless device, for example, a system in which an antenna module including two transmission / reception circuits 200a and 200b as shown in FIG. The transmission / reception circuit 200a includes an antenna A, and performs transmission / reception operations via the antenna A. The transmission / reception circuit 200b includes an antenna B, and performs transmission / reception operations via the antenna B. Different frequency bands are assigned to these transmission / reception circuits 200a and 200b.

  However, there is a combination of frequency bands in which the band of interference waves such as harmonics and intermodulation waves of one transmission / reception circuit overlaps the reception band of the other transmission / reception circuit. In this case, the reception sensitivity of the other transmission / reception circuit is significantly reduced. FIG. 6 shows the situation. The received wave Rx (1) received by the antenna A includes the harmonic component (shaded portion) of the transmitted wave Tx (2) transmitted by the antenna B, and the received harmonic wave becomes an interference wave. Is interfering.

  Therefore, conventionally, as shown in FIG. 5, each transmission / reception circuit 200a, 200b is provided with a notch filter, a low-pass filter, and an isolator to reduce interference by attenuating harmonics that interfere with the received wave. .

  In addition, for example, Patent Documents 1 to 3 disclose techniques for reducing the influence of interference waves. Patent Document 1 provides a filter that blocks a high-frequency signal output from a transmission circuit in a preceding stage of a nonlinear element provided in a reception circuit, and the quality of a demodulated signal obtained by demodulating the cutoff frequency of the filter by the reception circuit or a transmission circuit The structure which adjusts according to the output power of the high frequency signal output from is disclosed.

  Patent Document 2 sets a frequency of a frequency variable filter bandpass that filters a high-frequency communication signal composed of a plurality of subcarrier signals in a predetermined passband based on setting frequency information of a modem that demodulates the high-frequency communication signal. The structure to perform is disclosed.

  In Patent Literature 3, a monitoring receiving unit that detects the reception level of the interference wave channel is provided separately from the communication receiving unit that receives the required channel, and the reception level of the intermodulation wave in the reception level of the required channel is determined. The structure which controls the attenuation amount of the variable attenuator provided in the receiving part for communication so that it may become below a threshold value is disclosed.

JP 2007-124528 A (published May 17, 2007) JP 2007-243661 A (published on September 20, 2007) JP 2000-68870 A (published March 3, 2000)

  However, in the configuration including the notch filter, the low-pass filter, and the isolator, the number of components increases, and thus there is a problem that the mounting area and the component cost increase. The configuration described in Patent Document 3 in which a monitoring receiving unit is provided separately from the communication receiving unit is the same, and an increase in mounting area and component cost cannot be denied. Furthermore, there is a possibility that satisfactory characteristics cannot be obtained because circuit loss increases with the addition of components.

  Further, the technique described in Patent Document 1 adjusts the cutoff frequency according to the quality of the demodulated signal or the output power of the high-frequency signal output from the transmission circuit, so that reception characteristics need to be monitored and the processing is complicated. . Moreover, the technique described in Patent Document 2 is limited to a specific radio system such as OFDM using a plurality of subcarrier signals, and cannot be adopted for a general radio system.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to reduce the influence of interference waves more easily than the prior art without increasing the mounting area and the number of components. An antenna characteristic tuning system that can be used for a general wireless system is provided.

  In order to solve the above problems, an antenna characteristic tuning system according to an aspect of the present invention includes an antenna, an antenna characteristic adjusting unit that adjusts the antenna characteristic of the antenna in accordance with a reception frequency band, and the antenna characteristic adjusting unit. Adjustment control means for controlling the antenna characteristic adjustment means so as to shift the center frequency of the antenna characteristic set according to the reception frequency band in a direction away from the frequency band of the interference wave generated in the reception frequency band. Have.

  According to one aspect of the present invention, the influence of an interference wave can be reduced more easily than in the related art without increasing the mounting area and the number of components, and can be employed in a general wireless system. There is an effect that can be.

It is a functional block diagram which shows an example of the antenna characteristic tuning system in the 1st Embodiment of this invention. It is a figure which shows an example of the antenna characteristic of a 1st antenna, a frequency, and attenuation amount. It is a figure which shows the relationship between the antenna characteristic of a 1st antenna, and a harmonic before and behind shifting the center frequency of an antenna characteristic. It is a figure which shows an example of a 3rd adjustment table. It is a functional block diagram which shows an example of the conventional radio | wireless apparatus. It is a figure which shows that an interference wave is interfering with a receiving frequency band.

  Embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[First Embodiment]
FIG. 1 is a functional block diagram showing an example of an antenna characteristic tuning system according to the first embodiment of the present invention. As shown in FIG. 1, the antenna characteristic tuning system 1 is executed by a first transmission / reception circuit 100a, a second transmission / reception circuit 100b, a CPU / modem (adjustment control means) 60 for controlling them, and a CPU / modem 60. And a memory 70 in which programs and the like to be stored are stored.

  As will be described later, different frequency bands are assigned to the first and second transmission / reception circuits 100a and 100b, and a transmission operation and a reception operation can be performed simultaneously.

  The first transmitting / receiving circuit 100a includes a first antenna 10a, a first tuner (antenna characteristic adjusting means) 20a, a first duplexer 30a, a first high frequency amplifier circuit (Power Amplifier: PA) 40a, a first transceiver 50a, and the like. including. The second transmission / reception circuit 100b includes a second antenna 10b, a second tuner 20b, a second duplexer 30b, a second high-frequency amplifier (PA) 40b, and a second transceiver 50b. Since the second transmitter / receiver circuit 100b has the same function and configuration as the first transmitter / receiver circuit 100a, the first transmitter / receiver circuit 100a will be described as an example here. The first transmission / reception circuit 100a has a member name changed from “first” to “second” and the symbol “a” after the member number changed to “b”. This corresponds to a member included in the circuit 100b.

  The first transceiver 50a is connected to the first antenna 10a via a plurality of components, and transmits and receives signals to and from the base station via the first antenna 10a. Specifically, the first transceiver 50a instructs the CPU / modem 60 to receive a plurality of received waves received by the first antenna 10a from a plurality of received signals input from the first antenna 10a via the first duplexer 30a. In response to this, a received signal having a specific frequency is extracted and demodulated. The first transceiver 50a outputs a signal modulated based on an instruction from the CPU / modem 60 to the first PA 40a. The first PA 40a amplifies the input signal and passes through the first duplexer 30a to the first antenna 10a. To transmit a transmission wave including a transmission signal to the first antenna 10a.

  The first duplexer 30a is a filter that passes a frequency component of a predetermined pass band, and includes, for example, two band pass filters therein. Specifically, the first duplexer 30a passes the reception signal input from the first tuner 20a and outputs the received signal to the first transceiver 50a. The first duplexer 30a passes the transmission signal amplified by the first PA 40a and outputs the transmission signal to the first tuner 20a.

  The first transceiver 50a is controlled by the CPU / modem 60, and a frequency band used for transmission (hereinafter referred to as a transmission frequency band) and a frequency band used for reception (hereinafter referred to as a reception frequency band) are frequencies specified by the base station. Set each band. Specifically, when a terminal connects to a base station, the first transceiver 50a sets a frequency band stored in advance in the memory 70 in accordance with an instruction from the CPU / modem 60, and selects a base station in this frequency band. Search for. If a base station is found, the base station information is read and connected to the base station. At this time, the frequency used by the found base station is set in the first transceiver 50a. Thereafter, the first transmission / reception circuit 100a communicates with the base station using the set frequency band. In addition, the base station that communicates from the base station may be changed according to the communication state or the like. In this case, communication is performed by changing the setting of the first transceiver 50a according to the change of the base station.

  When the transmission frequency band and the reception frequency band are determined, the CPU / modem 60 outputs a control signal for controlling the antenna characteristics to the first tuner 20a in preparation for the reception operation, and controls the antenna characteristics of the first antenna 10a. To do. Specifically, the first tuner 20a is controlled, and the center frequency of the antenna characteristic (reception) in the first antenna 10a is generated in the reception frequency band of the first antenna 10a by the transmission wave of the second antenna 10b. Shift away from the (interfering wave) frequency band.

  The degree to which the center frequency of the antenna characteristic of the first antenna 10 a is shifted is associated with the first adjustment table stored in the memory 70 at, for example, five levels. The CPU / modem 60 selects and designates a level at which optimum reception characteristics can be obtained from the first adjustment table based on the transmission frequency band of the second transmission / reception circuit 100b (the frequency of the transmission wave of the second antenna 10b). One tuner 20a shifts the center frequency according to the instruction. As a result, the harmonic frequency band is positioned away from the center frequency.

FIG. 2 is a diagram illustrating an example of antenna characteristics, frequency, and attenuation of the first antenna. The horizontal axis indicates the frequency, and the vertical axis indicates the gain. Figure 2 shows the antenna characteristics of the first antenna 10a in a frequency band _f 0 ~f ₆ of the received wave. Here, the center frequency of the antenna characteristics of the first antenna 10a is set to a frequency f ₃ by the first tuner 20a. The frequencies f _{0 to} f ₂ and f _{4 to} f ₆ indicate frequencies separated from the frequency f _{3 at} equal intervals. Further, in the antenna characteristic of the first antenna 10a, the attenuation is small in the vicinity of the frequency f _3, increases abruptly and away from the frequency f _3. Here, the attenuation _{d 0} corresponding to the frequency _{f 3,} corresponding to a frequency _f 2, the attenuation amount _{d 1} corresponding to _{f 4,} attenuation _{d 2} corresponding to the frequency _f 1, _{f 5,} the frequency _f 0, _{f 6} It is shown as attenuation d ₃ to.

  FIGS. 3A and 3B are diagrams showing the relationship between the antenna characteristics of the first antenna and the harmonics before and after shifting the center frequency of the antenna characteristics. 3A corresponds to the one before the center frequency of the antenna characteristics of the first antenna is shifted, and FIG. 3B corresponds to the one after the center frequency of the antenna characteristics of the first antenna is shifted. In FIG. 3A, the antenna characteristics and the relationship between the frequency and attenuation of the first antenna 10a before shifting the center frequency are the same as those shown in FIG.

In FIG. 3 (a), that the harmonic frequency band _f 0 ~f ₂ of the received frequency band _f 0 ~f ₆ of the first antenna 10a by the transmission wave transmitted by the second antenna 10b is generated Show. For example, the frequency band of the transmission wave by the second antenna 10b is 709 to 714 (MHz), and the frequency band of the reception wave by the first antenna 10a is 2135 to 2155 (MHz) (center frequency: 2145 (MHz)). In this case, the frequency band 2127 to 2142 (MHz) of the third harmonic of the transmission wave interferes with the reception wave.

On the other hand, when shifting the center frequency of the antenna characteristics of the first antenna 10a to the frequency _{f 5,} the antenna characteristics of the first antenna 10a is as shown in FIG. 3 (b). Specifically, since the harmonic component of the transmission wave transmitted by the second antenna 10b is farther from the center frequency than before shifting, the amount of attenuation increases compared to before shifting (attenuation amounts d ₅ and d _6). ). Thereby, it is possible to reduce interference of the harmonics of the transmission wave with the reception wave.

  For example, as described above, when the frequency band of the transmission wave by the second antenna 10b is 709 to 714 (MHz) and the frequency band of the reception wave by the first antenna 10a is 2135 to 2155 (MHz), 2145 (MHz ) To 2155 (MHz), which is the upper end of the frequency band of the received wave (the end opposite to the side overlapping with the harmonics), the interference of the received wave due to the harmonics of the transmitted wave Mitigation is possible.

Further, when the center frequency of the antenna characteristics of the first antenna 10a is the frequency _{f 3,} the attenuation amount _d 3 of the frequency band _f 0 ~f ₂ harmonics, _{d 2} and less harmonics likely enter the received signal It was. Also, which is slightly more the attenuation d ₃ at the upper end f ₆ in the frequency band of the received wave.

In contrast, when the center frequency of the antenna characteristics of the first antenna 10a is the frequency _{f 5} is often a attenuation _d 5, _{d 4} of the frequency band _f 0 ~f ₂ harmonics, the harmonics received signal It can be prevented from entering. Further, the attenuation d ₁ can be reduced at the upper end f ₆ of the frequency band of the received wave. Therefore, increase the amount of attenuation in the band that matches the harmonic frequency band in the received wave, increase the attenuation amount in the band closer to the harmonic frequency band, and decrease it in the band far from the harmonic frequency band. The reception sensitivity of the entire reception frequency band can be improved.

  As for the antenna characteristics of the first antenna 10a, the amount of attenuation is small in the vicinity of the center frequency, and the amount of attenuation suddenly increases at a distant position. By shifting the center frequency, the harmonics generated in the reception frequency band of the first antenna 10a are located at a position away from the center frequency, so that the amount of attenuation is greater than before the center frequency is shifted. . Accordingly, by shifting the center frequency of the antenna characteristics of the first antenna 10a in the direction away from the harmonic frequency band, interference with the received wave due to the harmonic can be reduced.

  Further, the antenna characteristics of the first antenna 10a are such that the closer to the harmonic frequency band, the greater the amount of attenuation in the received wave frequency band of the first antenna 10a, and the smaller the amount of attenuation the further away from the harmonic frequency band. . That is, in the reception frequency band, the band close to the harmonic frequency band is greatly affected by the harmonics, and the band far from the harmonic frequency band is not easily affected by the harmonics. Increasing the near-band attenuation and reducing the attenuation far from the harmonic frequency band to improve the reception sensitivity of the band other than the harmonic frequency band in the reception frequency band of the first antenna 10a. Can do.

  As described above, by shifting the center frequency of the antenna characteristics of the first antenna 10a away from the harmonic frequency band, the amount of attenuation in the frequency band that is disturbed by the received wave is increased and Since the amount of attenuation in a non-frequency band can be increased as it is closer to the harmonic frequency band and decreased as it is farther from the harmonic frequency band, the reception sensitivity of the entire reception frequency band of the first antenna 10a can be improved. .

  Accordingly, the reception sensitivity of the entire reception band can be improved by shifting the center frequency of the antenna characteristics of the first antenna 10a away from the harmonic frequency band. There is no need to provide a circuit for reducing interference such as a low-pass filter and an isolator. Thereby, cost can be reduced.

  In the above description, only the case where the antenna characteristic of the first antenna 10a of the first transmission / reception circuit 100a is shifted based on the frequency band of the transmission wave of the second transmission / reception circuit 100b has been described. The antenna characteristics of the second antenna 10b of the second transmission / reception circuit 100b are also shifted based on the frequency band of the transmission wave of 100a.

[Modification]
In the modification, the antenna characteristic tuning system 1 is configured to adjust the antenna characteristic (reception) of the first antenna 10 a based on the second adjustment table stored in the memory 70.

  The second adjustment table associates the difference x (MHz) with the center frequency of the antenna characteristics (reception) of the first antenna 10a and the attenuation amount y (dB). The first tuner 20a specifies the center frequency of the antenna characteristics with the frequency that is a specific attenuation amount as a cutoff frequency. The specific attenuation amount may be a value sufficient to attenuate the harmonics generated in the reception frequency band of the first antenna 10a, and the value varies depending on the signal strength and the noise strength. Then, the frequency calculated based on the frequency associated with the attenuation amount and the harmonic frequency band, here the frequency closer to the frequency band of the received wave out of the harmonic frequency band, is the frequency of the first antenna 10a. Set as the center frequency of antenna characteristics.

For example, in the case where the second adjustment table includes a record in which the d ₃ (dB) characteristic deteriorates when the frequency is 5 (MHz) away from the center frequency, the second adjustment table includes the frequency band of the received wave in the harmonic frequency band. The close frequency, here, 2142 (MHz), which is the attenuation d ₃ (dB), is determined as the cutoff frequency. Thereby, the setting of the center frequency of the antenna characteristics of the first antenna 10a can be changed from 2145 (MHz) to 2147 (MHz).

  Note that the cut-off frequency varies depending on the noise intensity and antenna characteristics at that time. For this reason, a point (difference from the center frequency) at which the antenna characteristic is attenuated to obtain an attenuation amount that can sufficiently invalidate the assumed noise intensity is obtained, and that point is set as a cutoff frequency.

[Second Embodiment]
In the second embodiment, the antenna characteristic tuning system 1 is configured to adjust the antenna characteristic (reception) of the first antenna 10 a based on the third adjustment table stored in the memory 70.

  The third adjustment table associates the frequency at which the antenna characteristic of the first antenna 10a is maximized with respect to each of a plurality of frequencies having different transmission waves from the second antenna 10b. Specifically, the memory 70 stores a third adjustment table as shown in FIG. The third adjustment table is a reception in which each center frequency of the reception channel assigned to the first transmission / reception circuit 100a is shifted by an optimum amount for each of a plurality of transmission channels assigned to the second transmission / reception circuit 100b including the second antenna 10b. The antenna characteristic setting value is associated. Thus, the CPU / modem 60 sets the frequency associated with the frequency to the center frequency of the antenna characteristic of the first transmission / reception circuit 100a according to the transmission frequency during the transmission operation by the second transmission / reception circuit 100b.

  In the above-described embodiment, reception of the first antenna 10a of the first transmission / reception circuit 100a is away from the interference wave generated in the reception frequency band of the first transmission / reception circuit 100a by the transmission wave of the second transmission / reception circuit 100b. Although the center frequency of the antenna characteristics at the time is shifted, the present invention is not limited to this. The frequency band of the interference wave generated in the reception frequency band of the first transmission / reception circuit 100a approaches the end of the reception frequency band of the first transmission / reception circuit 100a in the direction of transmission of the second antenna 10b of the second transmission / reception circuit 100b. The center frequency of the antenna characteristics may be shifted.

[Summary]
An antenna characteristic tuning system 1 according to an aspect of the present invention includes a first antenna 10a, a second antenna 10b, and a first antenna characteristic that adjusts the antenna characteristic of the first antenna 10a according to a reception frequency band and a transmission frequency band. Adjustment means (first tuner 20a), second antenna characteristic adjustment means (second tuner 20b) for adjusting the antenna characteristics of the second antenna 10b in accordance with the reception frequency band and transmission frequency band, and the first antenna 10a And a transmission wave transmitted through one of the second antennas 10b causes an interference wave in a reception frequency band of a signal received through the other of the first antenna 10a and the second antenna 10b. If it is generated, the antenna characteristic adjustment means of the receiving antenna will cause interference in the reception frequency band. To shift the center frequency of the antenna characteristics of the receiving antenna in the direction away from the band, and a said adjustment control means for controlling the antenna characteristics adjustment means (CPU / Modem 60).

  According to the above configuration, since the interference wave generated in the reception frequency band is located at a position away from the center frequency, the amount of attenuation is larger than before the center frequency is shifted. Therefore, by shifting the center frequency of the antenna characteristics on the receiving side in a direction away from the frequency band of the interference wave, interference with the reception wave due to the interference wave can be reduced.

  In the reception frequency band, the band close to the interference wave frequency band is greatly affected by the interference wave, and the band far from the interference wave frequency band is not easily affected by the interference wave. Since the attenuation amount in the near band is large and the attenuation amount in the band far from the interference wave frequency band is reduced, the reception sensitivity of the band other than the interference wave frequency band can be improved in the reception frequency band. Therefore, the reception sensitivity of the entire reception frequency band can be improved.

  Furthermore, by shifting the center frequency of the antenna characteristics in a direction away from the frequency band of the interference wave, the reception sensitivity of the entire reception frequency band can be improved. It is not necessary to provide a circuit for reducing the interference wave such as. Thereby, cost can be reduced.

  Therefore, there is provided an antenna characteristic tuning system 1 that can reduce the influence of an interference wave more easily than the prior art without increasing the mounting area and the number of components, and that can be adopted in a general wireless system. be able to.

  For example, in the antenna characteristic tuning system 1 according to one aspect of the present invention, the adjustment control means includes first and second antennas 10a and 10b based on adjustments of the first and second antenna characteristic adjustment means, respectively. Based on the adjustment table A (second adjustment table) that associates the difference from the center frequency, which is a characteristic of each, and the gain attenuation amount, the attenuation amount is sufficient to attenuate the interference wave generated in the reception frequency band. A difference from the associated center frequency is specified, and a frequency calculated based on the specified difference and the frequency band of the interference wave is set as the center frequency of the antenna characteristic of the receiving antenna.

  According to the above configuration, the center frequency can be easily calculated by determining the attenuation amount of the interference wave to a specific value.

  In the antenna characteristic tuning system 1 according to one aspect of the present invention, the adjustment control unit is configured to determine a frequency band of a signal received by the other antenna for each transmitted wave having a different frequency band transmitted via the one antenna. Based on the adjustment table B (third adjustment table) that associates the center frequency of the antenna characteristics when the reception characteristics are maximized, the center frequency of the antenna characteristics of the receiving antenna is set.

  According to the above configuration, since the optimum center frequency corresponding to the frequency of the transmission wave is determined in advance, it is easy to set the center frequency.

  In the antenna characteristic tuning system according to one aspect of the present invention, the first antenna 10a and the second antenna 10b, and the first antenna that adjusts the antenna characteristics of the first antenna 10a according to the reception frequency band and the transmission frequency band Characteristic adjusting means (first tuner 20a), second antenna characteristic adjusting means (second tuner 20b) for adjusting the antenna characteristics of the second antenna 10b in accordance with a reception frequency band and a transmission frequency band, and the first antenna 10a and a transmission wave transmitted via one of the second antennas 10b is an interference wave in a reception frequency band of a signal received via the other one of the first antenna 10a and the second antenna 10b. The antenna characteristics adjustment means of the transmitting antenna is generated in the reception frequency band. In a direction away from the frequency band of the interference wave to shift the center frequency of the antenna characteristics of the transmitting side of the antenna that, and an adjustment control means (CPU / Modem 60) for controlling the antenna characteristics adjustment unit.

  According to the above configuration, it is possible to reduce the influence of the interference wave more easily than the prior art without increasing the mounting area and the number of components, and antenna characteristic tuning that can be adopted for general wireless systems A system 1 can be provided.

  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.

  Finally, each block of the antenna characteristic tuning system 1 may be realized by hardware by a logic circuit formed on an integrated circuit (IC chip).

  The antenna characteristic tuning system 1 includes 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, the program, and various data. A storage device (recording medium) such as a memory for storing the. 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 of the antenna characteristic tuning system 1 which is software for realizing the above-described functions are recorded so as to be readable by a computer. This can also be achieved by supplying the above to the antenna characteristic tuning system 1 and reading and executing the program code recorded on the recording medium by the computer (or CPU or MPU).

[Third Embodiment: Implementation Example by Software]
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 antenna characteristic tuning system 1 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, and 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.

DESCRIPTION OF SYMBOLS 1 Antenna characteristic tuning system 10a 1st antenna 10b 2nd antenna 20a 1st tuner (1st antenna characteristic adjustment means)
20b Second tuner (second antenna characteristic adjusting means)
30a 1st duplexer 30b 2nd duplexer 40a 1st high frequency amplifier circuit 40b 2nd high frequency amplifier circuit 50a 1st transceiver 50b 2nd transceiver 60 CPU / modem (adjustment control means)
70 Memory 100a First Transmission / Reception Circuit 100b Second Transmission / Reception Circuit

Claims (4)

A first antenna and a second antenna;
First antenna characteristic adjusting means for adjusting the antenna characteristic of the first antenna in accordance with a reception frequency band and a transmission frequency band;
Second antenna characteristic adjusting means for adjusting the antenna characteristic of the second antenna in accordance with a reception frequency band and a transmission frequency band;
A transmission wave transmitted via one of the first antenna and the second antenna is an interference wave in a reception frequency band of a signal received via the other of the first antenna and the second antenna. When the antenna characteristic adjustment means of the reception side antenna shifts the center frequency of the antenna characteristic of the reception side antenna away from the frequency band of the interference wave generated in the reception frequency band, the antenna characteristic adjustment means and a adjustment control means for controlling the means,
The adjustment control means associates a difference from the center frequency, which is a characteristic of each of the first and second antennas based on the adjustment of the first and second antenna characteristic adjustment means, and a gain attenuation amount. Based on the adjustment table A, a difference from the center frequency associated with an attenuation sufficient to attenuate the interference wave generated in the reception frequency band is specified, and the difference and the frequency band of the interference wave are determined. the frequencies calculated on the basis, characterized in that you set as the center frequency of the antenna characteristics of the receiving side of the antenna, antenna characteristics tuning system. A first antenna and a second antenna;
First antenna characteristic adjusting means for adjusting the antenna characteristic of the first antenna in accordance with a reception frequency band and a transmission frequency band;
Second antenna characteristic adjusting means for adjusting the antenna characteristic of the second antenna in accordance with a reception frequency band and a transmission frequency band;
A transmission wave transmitted via one of the first antenna and the second antenna is an interference wave in a reception frequency band of a signal received via the other of the first antenna and the second antenna. When the antenna characteristic adjustment means of the reception side antenna shifts the center frequency of the antenna characteristic of the reception side antenna away from the frequency band of the interference wave generated in the reception frequency band, the antenna characteristic adjustment means Adjustment control means for controlling the means,
The adjustment control means, for each transmitted wave having a different frequency band transmitted via one antenna, the center frequency of the antenna characteristic when the reception characteristic of the frequency band of the signal received by the other antenna is maximum the based on the adjustment table B which associates, you and sets the center frequency of the antenna characteristics of the receiving side of the antenna, antenna characteristics tuning system. A first antenna and a second antenna;
First antenna characteristic adjusting means for adjusting the antenna characteristic of the first antenna in accordance with a reception frequency band and a transmission frequency band;
Second antenna characteristic adjusting means for adjusting the antenna characteristic of the second antenna in accordance with a reception frequency band and a transmission frequency band;
A transmission wave transmitted via one of the first antenna and the second antenna is an interference wave in a reception frequency band of a signal received via the other of the first antenna and the second antenna. When the antenna characteristic adjustment means of the transmission side antenna shifts the center frequency of the antenna characteristic of the transmission side antenna away from the frequency band of the interference wave generated in the reception frequency band, the antenna characteristic adjustment means Adjustment control means for controlling the means ,
The adjustment control means associates a difference from the center frequency, which is a characteristic of each of the first and second antennas based on the adjustment of the first and second antenna characteristic adjustment means, and a gain attenuation amount. Based on the adjustment table A, a difference from the center frequency associated with an attenuation sufficient to attenuate the interference wave generated in the reception frequency band is specified, and the difference and the frequency band of the interference wave are determined. the frequencies calculated on the basis, characterized in that you set as the center frequency of the antenna characteristics of the receiving side of the antenna, antenna characteristics tuning system. A first antenna and a second antenna;
First antenna characteristic adjusting means for adjusting the antenna characteristic of the first antenna in accordance with a reception frequency band and a transmission frequency band;
Second antenna characteristic adjusting means for adjusting the antenna characteristic of the second antenna in accordance with a reception frequency band and a transmission frequency band;
A transmission wave transmitted via one of the first antenna and the second antenna is an interference wave in a reception frequency band of a signal received via the other of the first antenna and the second antenna. When the antenna characteristic adjustment means of the transmission side antenna shifts the center frequency of the antenna characteristic of the transmission side antenna away from the frequency band of the interference wave generated in the reception frequency band, the antenna characteristic adjustment means Adjustment control means for controlling the means,
The adjustment control means, for each transmitted wave having a different frequency band transmitted via one antenna, the center frequency of the antenna characteristic when the reception characteristic of the frequency band of the signal received by the other antenna is maximum Is set as the center frequency of the antenna characteristic of the receiving-side antenna based on the adjustment table B associated with the antenna characteristic tuning system.

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