JP2000049650A - Radio equipment and antenna common-use unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the antenna common-use unit and radio equipment which can provide proper sensitivity even when plural system communication bands are selectively used. SOLUTION: The antenna common-use unit 2 consists of a receiving filter 21 and a transmitting filter 22. Those filters 21 and 22 have two filter characteristics respectively and the said filter characteristics are controlled according to the control voltage Vc1 from a control part 40. A switching instruction detecting means 40a monitors received data to detect an instruction for switching a communication band from a base station. When the switching instruction detecting means 40a detects the said switching instruction, a communication band switching control means 40b controls the frequency of a local oscillation signal generated by a frequency synthesizer 4 by varying and controlling a control voltage Vc2 so that a communication is carried out over the system communication band corresponding to the instruction and also switches and controls the filter characteristics of the antenna common-use unit 2 by varying and controlling the control voltage Vc1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio apparatus for performing communication by selectively using a plurality of system communication bands and an antenna duplexer for the radio apparatus.

[0002]

2. Description of the Related Art As is well known, an antenna duplexer provided in a radio apparatus is provided between a transmitting unit and an antenna and between a receiving unit and an antenna and combines two filters for reception and transmission. Become.

As shown in FIG. 7, when communicating in the system communication band A, the filter on the transmission side attenuates the signal in the reception band RA and reduces the insertion loss with respect to the signal in the transmission band TA. , While the filter on the receiving side has a transmission band TA
By attenuating the signal of the receiving band RA so as to reduce the insertion loss with respect to the signal of the receiving band RA.
It is possible to share one antenna for transmission and one for reception.

[0004] Recently, mobile communication typified by a mobile phone system has been actively performed, and there has been a problem of insufficient capacity of a radio line. To cope with this problem, a new system communication band B (transmission band TB, reception band RB) is newly set as shown in FIG. 7, and one radio device selectively uses two system communication bands. The development of wireless devices is being pursued by the present inventors.

However, when the conventional antenna duplexer having the filter characteristics as shown in FIG. 7 is applied to the above-described radio apparatus, the transmission-side filter of the transmission-side filter in the new transmission band TB of the system communication band B is used. There is a problem that the insertion loss is large and the attenuation of the filter on the receiving side is small.

[0006] Further, depending on the filter characteristics, even if proper transmission is performed in the transmission band TB, there occurs a problem that proper reception is not performed in the reception band RA instead. There is a problem that communication in the system communication band is deteriorated as compared with the other.

On the other hand, a method of newly developing an antenna duplexer having filter characteristics corresponding to two system communication bands can be considered. However, as shown in FIG. 7, the reception band RA and the transmission band TB are close to each other. In this case, a new problem arises in that a filter having a steep insertion loss characteristic is required.

A method of providing two antenna duplexers and switching the antenna duplexer to be used in accordance with the system communication band to be used is also conceivable.
There is a problem that the circuit becomes complicated.

[0009]

A problem with the conventional antenna duplexer is that the circuit becomes complicated and large in size when applied to a radio apparatus that performs communication by selectively using a plurality of system communication bands. was there.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and uses an antenna duplexer that exhibits ideal pass characteristics simultaneously for a plurality of system communication bands, or switches between a plurality of antenna duplexers. An object of the present invention is to provide an antenna duplexer that can exhibit appropriate filter characteristics for a plurality of system communication bands without complicating or enlarging a circuit as compared with the case.

It is another object of the present invention to provide a radio device capable of performing communication with appropriate sensitivity in each system communication band even when a plurality of system communication bands are selectively used.

[0012]

In order to achieve the above object, a radio device according to the present invention is a radio device for performing communication by selectively using a plurality of system communication bands. And between the antenna
By making the transmission pass characteristics of a high-frequency signal between an antenna and a transmission unit different from the reception pass characteristics of a high-frequency signal between an antenna and a reception unit, one antenna is shared by the transmission unit and the reception unit. An antenna sharing unit having a plurality of transmission pass characteristics and a plurality of reception pass characteristics; a switching instruction detecting unit for detecting a switching instruction of a system communication band from a communication partner station from a received signal; and a detection of the switching instruction detecting unit. According to the result, a communication band switching means for selectively controlling the transmission pass characteristic and the reception pass characteristic of the antenna sharing means is provided.

Further, according to the present invention, in a radio apparatus for performing communication by selectively using a plurality of system communication bands, the radio apparatus is provided between a transmitting unit and a receiving unit and an antenna,
By making the transmission pass characteristics of a high-frequency signal between an antenna and a transmission unit different from the reception pass characteristics of a high-frequency signal between an antenna and a reception unit, one antenna is shared by the transmission unit and the reception unit. An antenna sharing unit having a plurality of transmission pass characteristics and a plurality of reception pass characteristics, a switching instruction detecting unit that detects a switching instruction of a system communication band from a user, and a detection result of the switching instruction detecting unit. A communication band switching means for selectively controlling the transmission pass characteristic and the reception pass characteristic of the antenna sharing means is provided.

In the wireless device having the above configuration, the pass characteristic of the antenna sharing means is selectively controlled in response to a system communication band switching instruction from a communication partner station or a user.

Therefore, according to the radio apparatus having the above configuration, the pass characteristic of the antenna sharing means can be selectively controlled according to the system communication band to be used, so that communication can be performed with appropriate sensitivity in a plurality of system communication bands. .

In order to achieve the above object, according to the present invention, in a radio apparatus for performing communication by selectively using a plurality of system communication bands, a local oscillation signal used for frequency conversion of a transmission / reception signal is controlled. Oscillating means for generating a signal at a frequency corresponding to a signal, switching instruction detecting means for detecting a system communication band switching instruction from a communication partner station from a received signal, and generating a control signal according to a detection result of the switching instruction detecting means And an oscillation frequency control means for controlling the frequency of a local oscillation signal generated by the oscillation means; and a transmission section provided between the transmission section, the reception section, and the antenna, and transmitting a high-frequency signal between the antenna and the transmission section. By making the transmission characteristics different from the reception transmission characteristics of the high-frequency signal between the antenna and the receiving unit, one antenna is shared by the transmitting unit and the receiving unit, and Receiving pass characteristic and the transmission pass characteristic on the basis of a control signal generated by the number control means is adapted to configured by including an antenna sharing means for variably.

Further, according to the present invention, in a radio apparatus that performs communication by selectively using a plurality of system communication bands, a local oscillation signal used for frequency conversion of a transmission / reception signal is generated at a frequency corresponding to a control signal. Oscillating means, switching instruction detecting means for detecting a system communication band switching instruction from a user, and a local oscillation signal generated by the oscillating means for generating a control signal according to the detection result of the switching instruction detecting means Oscillation frequency control means for controlling the frequency of the signal, a transmission pass characteristic of a high-frequency signal between the antenna and the transmission unit, and a high-frequency signal between the antenna and the reception unit, provided between the transmission unit and the reception unit and the antenna. In this case, one antenna is commonly used by the transmitting unit and the receiving unit, and is based on a control signal generated by the oscillation frequency control means. There reception pass characteristic and the transmission passage characteristic is to be configured by including an antenna sharing means for variably.

In the radio apparatus having the above configuration, when a communication partner station or a user issues a system communication band switching instruction, the pass characteristic of the antenna sharing means is determined based on a control signal for switching the frequency of the local oscillation signal. Is variably controlled.

Therefore, according to the radio apparatus having the above configuration, the pass characteristic of the antenna sharing means can be variably controlled according to the system communication band to be used, so that communication can be performed with appropriate sensitivity in a plurality of system communication bands. .

In order to achieve the above object, according to the present invention, in a radio apparatus for performing communication by selectively using a plurality of system communication bands, a local oscillation signal used for frequency conversion of a transmission / reception signal is transmitted by a second communication apparatus. Oscillating means for generating a signal at a frequency corresponding to the first control signal, switching instruction detecting means for detecting an instruction to switch the system communication band from a communication partner station from the received signal, and a switching instruction detecting means for detecting the switching instruction detecting means. An oscillation frequency control means for generating the control signal of the first section and controlling the frequency of a local oscillation signal generated by the oscillation means; and a transmission section, a reception section, and an antenna. The transmission and reception characteristics of a high-frequency signal between the antenna and the reception unit are made different from each other, so that one antenna is shared by the transmission unit and the reception unit. Te, an antenna sharing unit receiving pass characteristic and the transmission pass characteristic in response to the second control signal is varied,
Control signal conversion means for providing a second control signal based on the first control signal generated by the oscillation frequency control means to the antenna sharing means to variably control the transmission pass characteristics and the reception pass characteristics I did it.

Further, according to the present invention, in a radio apparatus for performing communication by selectively using a plurality of system communication bands, a local oscillation signal used for frequency conversion of a transmission / reception signal is changed to a frequency corresponding to a first control signal. Generating means, a switching instruction detecting means for detecting a switching instruction of the system communication band from the user, and a first control signal corresponding to a detection result of the switching instruction detecting means, and generating the first control signal. Oscillation frequency control means for controlling the frequency of the generated local oscillation signal; provided between the transmitting section and the receiving section and the antenna; transmission pass characteristics of a high-frequency signal between the antenna and the transmitting section; By making the reception pass characteristics of the high-frequency signal different between the units, one antenna is shared by the transmission unit and the reception unit, and the transmission passage characteristic is changed according to the second control signal. And a second control signal based on the first control signal generated by the oscillation frequency control means is provided to the antenna sharing means to vary the transmission and reception characteristics. And a control signal converting means for controlling.

In the radio apparatus having the above configuration, when a communication partner station or a user issues a system communication band switching instruction, the second control signal based on the first control signal for switching the frequency of the local oscillation signal is provided. Thus, the pass characteristic of the antenna sharing means is variably controlled.

Therefore, according to the radio apparatus having the above configuration, the pass characteristic of the antenna sharing means can be variably controlled according to the system communication band to be used, so that communication can be performed with appropriate sensitivity in a plurality of system communication bands. .

In order to achieve the above object, an antenna duplexer according to the present invention is an antenna duplexer in which one antenna is shared by a transmitter and a receiver. And a second filter for connecting the antenna and the receiver, wherein the pass characteristics of these filters can be varied according to an external control signal.

Therefore, according to the antenna duplexer having the above configuration, the pass characteristic of the filter can be variably controlled according to an external control signal, so that ideal pass characteristics can be simultaneously exhibited in a plurality of system communication bands. It is possible to achieve appropriate filter characteristics for multiple system communication bands without complicating or increasing the size of the circuit as compared to the case of using multiple antenna duplexers or switching between multiple antenna duplexers. is there.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A mobile communication terminal according to a first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration, in which a CD
A mobile communication terminal device using the MA system as a communication system is taken as an example.

The radio frequency signal received by the antenna 1 from the space is input to the antenna duplexer 2. The antenna duplexer 2 includes a reception filter 21 and a transmission filter 22. These filters 21 and 22 are 2
It has two filter characteristics, and the above characteristics are controlled according to a control voltage Vc1 from the control unit 40 described later.

Of the radio frequency signals input from the antenna 1, a radio frequency signal in a band transmitted from a base station (not shown) passes through the reception filter 21 and is received by the receiver (RX).
3 is input. Note that this radio frequency signal is not input to the transmission unit 5 described later by the transmission filter 22.

In the receiving section 3, the radio frequency signal is mixed with the receiving local oscillation signal output from the frequency synthesizer (SYN) 4 and frequency-converted into an intermediate frequency signal. Note that the frequency of the reception local oscillation signal generated from the frequency synthesizer 4 is specified by the control voltage Vc2 from the control unit 40.

The intermediate frequency signal obtained by the receiving unit 3 is C
After the orthogonal demodulation processing is performed in the DMA signal processing unit 6, despreading processing is performed to convert the data into data of a predetermined format according to the data rate.

The result of the conversion is input to the voice code processor 7 as received data, and among the received data, data indicating a data rate is input to the controller 40 as the received data rate.

The voice code processing section 7 subjects the received data obtained by the CDMA signal processing section 6 to a decompression process in accordance with the reception data rate notified from the control section 40. It is input to the code processing unit 8.

The PCM code processing section 8 includes a speech code processing section 7
To decode the received data to obtain an analog reception signal. The analog reception signal is amplified by the amplifier 9 and then output from the speaker 10 as a loudspeaker.

On the other hand, the input voice of the speaker is
1 is input as an analog transmission signal through an amplifier 1
After being amplified to an appropriate level in step 2, the PCM code processing section 8
Is subjected to a PCM encoding process, and is output to the speech encoding unit 7 as transmission data.

The voice code processing section 7 includes a PCM code processing section 8
, An energy amount of the input voice is detected from the transmission data input from, a data rate is determined based on the detection result, and the control unit is notified of the data rate. Then, the transmission data is compressed into a burst signal having a format corresponding to the data rate, and is input to the CDMA signal processing unit 6.

The CDMA signal processing unit 6 performs a spreading process on the burst signal compressed by the voice code processing unit 7 using a PN code corresponding to a transmission channel. Then, a quadrature modulation process is performed on the processing result, and the result is input to the transmission unit (TX) 5 as a quadrature modulation signal.

The transmitting section 5 combines the quadrature modulated signal with the transmitting local oscillation signal and converts it into a radio frequency signal.
Based on the transmission data rate notified by the above, only the effective portion of the radio frequency signal is amplified at a high frequency and input to the antenna duplexer 2. The transmission local oscillation signal is generated by the frequency synthesizer 4 and is controlled by the control unit 40.
This is an oscillation signal having a frequency corresponding to the control voltage Vc2.

With respect to the radio frequency signal from the transmitting unit 5 input to the antenna duplexer 2, only the radio frequency signal in the transmission band is input to the antenna 1 by the transmission filter 22, and is transmitted to the base station in space. Radiated. Note that the radio frequency signal in this transmission band is not input to the receiving unit 3 by the receiving filter 21. Reference numeral 31 denotes a power supply circuit which generates a predetermined operating power supply voltage Vcc based on the output of the battery 30 and supplies it to each circuit.

The control unit 40 has, for example, a microcomputer as a main control unit, and controls each unit in an integrated manner. As the control contents, in addition to normal communication control for establishing communication with a base station (not shown) to perform communication, band selection control for selecting a system communication band to be used for communication from two system communication bands is performed.

In order to perform the band selection control, the control unit 40 includes a switching instruction detecting unit 40a and a communication band switching control unit 40b. Switching instruction detecting means 40a
Monitors the received data decoded by the PCM code processor 8 and detects a communication band switching instruction from the base station. When the switching instruction detecting means 40a detects a system communication band switching instruction from the base station, the communication band switching control means 40b controls the control voltage so that communication can be performed in the system communication band according to the instruction. Vc2 is variably controlled to control the frequency of the local oscillation signal generated by the frequency synthesizer 4, and the control voltage Vc1 is variably controlled to switch the filter characteristics of the antenna duplexer 2.

The storage unit 41 uses a semiconductor memory such as a ROM or a RAM as a storage medium. The storage medium stores a control program of the control unit 40, various control data,
Various setting data by the user, dial data corresponding to abbreviated dialing, etc. are stored.

The console unit (CU) 42 displays keys such as a dial key, a transmission key, a power key, an end key, a volume control key, and a mode designation key, and displays the telephone number of the communication partner terminal and the operation state of the apparatus. LC to do
A D indicator and an LED lamp indicating a discharge state of the battery 30 (requesting charging of the battery 30) are provided.

Next, with reference to the flowchart shown in FIG. 2, the switching control operation of the communication band of the mobile radio communication terminal device having the above-described configuration will be described. When an incoming signal arrives from the base station to the mobile radio communication terminal device and the user operates the console unit 42 to respond to the incoming signal or the user operates the console unit 42 to perform an outgoing operation, The control of the flowchart shown in FIG. 2 is started.

First, in step 2a, the control unit 40 controls each unit to establish a communication link with the base station.
When a call is possible, the process proceeds to step 2b.
In step 2b, the switching instruction detecting means 40a
The received data decoded by the code processing unit 8 is monitored. Here, when an instruction to switch the communication band from the base station is detected, the process proceeds to step 2e, and when not detected, the process proceeds to step 2c.

In step 2c, the control unit 40 monitors the arrival of a notification from the base station to perform the call termination processing, and also monitors the operation of the termination key of the console unit 42 by the user. Then, upon detecting the arrival of the notification from the base station to perform the call termination process, or when the call termination key of the console unit 42 is operated, the process proceeds to step 2d. In step 2d, the communication link established with the base station is disconnected, call termination processing is performed, and the system is again in a standby state for incoming or outgoing calls.

On the other hand, in step 2e, the communication band switching control means 40b variably controls the control voltage Vc2 so that communication can be performed in the communication band according to the instruction from the base station. Switching of the frequency of the generated local oscillation signal is controlled, and the process proceeds to step 2f.

In step 2f, the communication band switching control means 40b variably controls the control voltage Vc1 so that transmission / reception can be performed in the system communication band in accordance with the instruction from the base station. Is switched, and the process proceeds to step 2b.

In step 2e, the filter characteristic is switched by controlling the control voltage Vc1 variably when communication is performed in the higher system communication band A of the two system communication bands A and B. The characteristics of 21 and 22 are switched as shown in FIG.

The characteristics of the receiving filter 21 shown in FIG.
For the reception band RA, the input loss amount is G1 [dB],
For the transmission band TA, the attenuation is G2 [dB] (> G
1). The characteristic of the transmission filter 22 is that the attenuation is G2 [dB] for the reception band RA.
Then, for the transmission band TA, the input loss amount is G1 [dB].
This is the characteristic.

On the other hand, when communication is performed in the lower system communication band B of the two system communication bands A and B, the control voltage Vc1 is variably controlled and the filters 21 and 22 are controlled.
The characteristic of No. 2 is switched as shown in FIG.

The characteristics of the receiving filter 21 shown in FIG.
For the reception band RB, the input loss amount is G1 [dB],
The transmission band TB has such a characteristic that the attenuation is G2 [dB]. The characteristics of the transmission filter 22 are as follows: the attenuation is G2 [dB] for the reception band RB, and the transmission band T
B has a characteristic that the input loss amount is G1 [dB].

As described above, in the mobile communication terminal having the above configuration, the switching instruction detecting means 40a detects an instruction to switch the system communication band from the base station, and the communication band switching control means 40b responds to this instruction. The frequency of the local oscillation signal generated by the frequency synthesizer 4 is controlled. At this time, the communication band switching control means 40b switches the filter characteristics of the antenna duplexer 2 to characteristics suitable for the system communication band specified by the base station and performs communication.

Therefore, according to the mobile communication terminal device having the above configuration, even if two system communication bands are selectively used, the antenna duplexer 2 has appropriate filter characteristics, so that communication is performed with appropriate sensitivity. be able to.

Also, as compared with a case where an antenna duplexer that simultaneously exhibits ideal pass characteristics for two system communication bands is applied to the antenna duplexer 2 or when two antenna duplexers are switched and used, The circuit is simple and small.

Next, a mobile communication terminal according to a second embodiment of the present invention will be described. FIG. 5 shows the configuration. Here, a mobile communication terminal device using a CDMA system as a communication system is taken as an example. However, in FIG. 5, the same parts as those in FIG. 1 showing the configuration of the mobile communication terminal apparatus of the first embodiment are denoted by the same reference numerals, and different parts will be mainly described here.

The mobile communication terminal device shown in FIG. 5 is different from the mobile communication terminal device shown in FIG. 1 in that control unit 40 includes oscillation frequency switching control unit 40c instead of communication band switching control unit 40b. The difference is that a comparison circuit 51 is newly provided.

When the switching instruction detecting means 40a detects a switching instruction of the system communication band from the base station, the oscillation frequency switching control means 40c performs the above-mentioned communication so that the communication can be performed in the system communication band according to the instruction. The frequency of the local oscillation signal generated by the frequency synthesizer 4 is controlled by variably controlling the control voltage Vc2.

The control circuit 51 receives the control voltage Vc2 and compares the control voltage with a preset reference voltage to determine which system communication band to use, A or B.

The comparison circuit 51 supplies the antenna duplexer 2 with a control voltage Vc1 having filter characteristics as shown in FIG. 3 in the case of the system communication band A, and in the case of the system communication band B, Supplies a control voltage Vc1 having a filter characteristic as shown in FIG.

In the mobile communication terminal having such a configuration,
When the two system communication bands are selectively used, the antenna duplexer 2 has appropriate filter characteristics, so that communication can be performed with appropriate sensitivity.

Next, a mobile communication terminal according to a third embodiment of the present invention will be described. FIG. 6 shows the configuration, and here, a mobile communication terminal device using a CDMA system as a communication system is taken as an example. However, in FIG. 6, the same parts as those in FIG. 5 showing the configuration of the mobile communication terminal apparatus of the second embodiment are denoted by the same reference numerals, and different parts will be mainly described here.

The mobile communication terminal device shown in FIG. 6 is different from the mobile communication terminal device shown in FIG. 5 in that a conversion circuit 52 is provided instead of the comparison circuit 51. This conversion circuit 5
2, the control voltage Vc2 is input from the control unit 40. When the voltage value of the control voltage Vc2 indicates the system communication band A, this voltage signal is converted into a control voltage Vc1 having a filter characteristic as shown in FIG.

When the voltage value of the control voltage Vc2 indicates the system communication band B, this voltage signal is converted into a control voltage Vc1 having a filter characteristic as shown in FIG. Give to.

In the mobile communication terminal having such a configuration,
When the two system communication bands are selectively used, the antenna duplexer 2 has appropriate filter characteristics, so that communication can be performed with appropriate sensitivity.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the switching of the system communication band to be used is controlled in response to the switching instruction of the communication band from the base station. Instead, for example, the user instructs through the console unit 42. In a system capable of performing communication in the system communication band, the switching instruction detecting means 40a monitors an instruction from the user, and the communication band switching control means 40b and the oscillation frequency switching control means 40c respond to the monitoring result. Switching control may be performed. Even with such a configuration, a similar effect can be obtained.

Further, in the above-described embodiment, the mobile communication terminal device using the CDMA system as a communication system has been described as an example.
Needless to say, the present invention can be applied to the FDMA and TDMA communication systems, and the same effect can be obtained by applying the present invention to a wireless device fixedly operated without moving. It goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0067]

As described above, according to the present invention, the passing characteristic of the antenna sharing means is variably controlled in response to a system communication band switching instruction from a communication partner station or a user.

Therefore, according to the present invention, the pass characteristic of the antenna sharing means can be variably controlled according to the system communication band to be used, so that a radio apparatus capable of performing communication with appropriate sensitivity in a plurality of system communication bands Can be provided.

Further, according to the present invention, the pass characteristics of the first filter provided between the antenna and the transmitter and the second filter provided between the antenna and the receiver in response to an external control signal. Can be variably controlled.

Therefore, according to the present invention, a circuit is required to be compared with a case where an antenna duplexer which exhibits ideal pass characteristics simultaneously for a plurality of system communication bands or a case where a plurality of antenna duplexers are switched and used. An antenna duplexer capable of exhibiting appropriate filter characteristics for a plurality of system communication bands without increasing complexity or size can be provided.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing a configuration of a first embodiment of a mobile communication terminal device according to the present invention.

FIG. 2 is a flowchart for explaining a communication band switching control operation of the mobile communication terminal device shown in FIG. 1;

FIG. 3 is a diagram illustrating pass characteristics of a reception filter and a transmission filter when the mobile communication terminal device illustrated in FIG. 1 performs communication in a system communication band A.

FIG. 4 is a diagram illustrating pass characteristics of a reception filter and a transmission filter when the mobile communication terminal device illustrated in FIG. 1 performs communication in a system communication band B.

FIG. 5 is a circuit block diagram showing a configuration of a second embodiment of the mobile communication terminal device according to the present invention.

FIG. 6 is a circuit block diagram showing a configuration of a third embodiment of the mobile communication terminal device according to the present invention.

FIG. 7 is a diagram for explaining a pass characteristic of a conventional antenna duplexer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Antenna 2 ... Antenna duplexer 21 ... Receiving filter 22 ... Transmission filter 3 ... Receiving part 4 ... Frequency synthesizer 5 ... Transmitting part 6 ... CDMA signal processing part 7 ... Voice code processing part 8 ... PCM code processing part 9, DESCRIPTION OF SYMBOLS 12 ... Amplifier 10 ... Speaker 11 ... Microphone 30 ... Battery 40 ... Control part 40a ... Switching instruction detection means 40b ... Communication band switching control means 40c ... Oscillation frequency switching control means 41 ... Storage part 42 ... Console unit 51 ... Comparison circuit 52 ... Conversion circuit

Claims (8)

[Claims] 1. A wireless device for performing communication by selectively using a plurality of system communication bands, provided between a transmitting unit, a receiving unit, and an antenna, and a high-frequency signal between the antenna and the transmitting unit. By differentiating the transmission pass characteristic of the antenna and the reception pass characteristic of the high-frequency signal between the antenna and the reception unit, one antenna is shared by the transmission unit and the reception unit, and the transmission passage characteristic and Antenna sharing means each having a plurality of reception pass characteristics; switching instruction detecting means for detecting a switching instruction of a system communication band from a communication partner station from a received signal; and the antenna according to a detection result of the switching instruction detecting means. A wireless device comprising: communication band switching means for selectively controlling a transmission pass characteristic and a reception pass characteristic of a common means. 2. A radio apparatus for performing communication by selectively using a plurality of system communication bands, comprising: an oscillating means for generating a local oscillation signal used for frequency conversion of a transmission / reception signal at a frequency corresponding to a control signal; Switching instruction detecting means for detecting a system communication band switching instruction from a communication partner station from a signal; and a local unit generated by the oscillation means for generating the control signal according to a detection result of the switching instruction detecting means. An oscillation frequency control means for controlling the frequency of an oscillation signal; a transmission unit provided between a transmission unit and a reception unit; and an antenna; a transmission pass characteristic of a high-frequency signal between the antenna and the transmission unit; By making the reception pass characteristics of the high-frequency signal between the units different, one antenna is shared by the transmission unit and the reception unit, and the oscillation frequency control means Wireless device the received pass characteristic and the transmission pass characteristic on the basis of the control signal is made is characterized by comprising an antenna sharing means for variably. 3. A wireless device for performing communication by selectively using a plurality of system communication bands, comprising:
An oscillating means for generating a signal at a frequency corresponding to the control signal, a switching instruction detecting means for detecting a system communication band switching instruction from a communication partner station from a received signal, and a switching instruction detecting means for detecting the switching instruction detecting means. An oscillation frequency control means for generating a control signal of the first type and controlling a frequency of a local oscillation signal generated by the oscillation means; and a transmission section and a reception section provided between the antenna and the antenna. By making the transmission pass characteristic of a high-frequency signal between the antenna and the reception unit different from the transmission passage characteristic of a high-frequency signal between the antenna and the reception unit, one antenna is shared by the transmission unit and the reception unit. An antenna sharing unit in which the transmission pass characteristics and the reception pass characteristics are varied according to a second control signal; and wherein the antenna is based on a first control signal generated by the oscillation frequency control unit. A radio apparatus comprising: a control signal conversion unit that variably controls the transmission pass characteristics and the reception pass characteristics by providing a second control signal to the antenna sharing unit. 4. A radio apparatus for performing communication by selectively using a plurality of system communication bands, provided between a transmitting unit, a receiving unit, and an antenna, and a high-frequency signal between the antenna and the transmitting unit. By differentiating the transmission pass characteristic of the antenna and the reception pass characteristic of the high-frequency signal between the antenna and the reception unit, one antenna is shared by the transmission unit and the reception unit, and the transmission passage characteristic and Antenna sharing means each having a plurality of reception pass characteristics; switching instruction detecting means for detecting a system communication band switching instruction from a user; transmitting passage of the antenna sharing means according to a detection result of the switching instruction detecting means. A wireless device comprising communication band switching means for selectively controlling a characteristic and a reception pass characteristic. 5. A radio apparatus for performing communication by selectively using a plurality of system communication bands, comprising: an oscillating means for generating a local oscillation signal used for frequency conversion of a transmission / reception signal at a frequency corresponding to a control signal; Switching instruction detecting means for detecting an instruction to switch the system communication band from the apparatus; and generating the control signal in accordance with the detection result of the switching instruction detecting means, and changing the frequency of the local oscillation signal generated by the oscillating means. An oscillating frequency control means for controlling, provided between a transmitting unit and a receiving unit and an antenna, a transmission pass characteristic of a high frequency signal between the antenna and the transmitting unit, and a high frequency between the antenna and the receiving unit. By making the reception pass characteristics of the signal different, one antenna is shared by the transmission unit and the reception unit, and the control signal generated by the oscillation frequency control unit is used. Wireless device, wherein the receiving pass characteristic and the transmission pass characteristic is provided with a common antenna means for variably based on. 6. A wireless device for performing communication by selectively using a plurality of system communication bands, wherein a local oscillation signal used for frequency conversion of a transmission / reception signal is transmitted by a first oscillation unit.
Oscillating means for generating a signal at a frequency corresponding to the control signal, switching instruction detecting means for detecting a system communication band switching instruction from a user, and the first control signal corresponding to the detection result of the switching instruction detecting means. An oscillation frequency control unit that generates and controls a frequency of a local oscillation signal generated by the oscillation unit; and a transmission unit and a reception unit are provided between the antenna and the transmission unit. By making the transmission pass characteristic of the high-frequency signal different from the reception pass characteristic of the high-frequency signal between the antenna and the receiving unit, one antenna is shared by the transmitting unit and the receiving unit, and the second antenna An antenna sharing unit in which the transmission passage characteristic and the reception passage characteristic are varied according to a control signal; and the second control signal based on a first control signal generated by the oscillation frequency control unit. A radio apparatus, comprising: a control signal conversion unit that variably controls the transmission pass characteristic and the reception pass characteristic, which are provided to the antenna sharing unit. 7. The antenna sharing unit connects the antenna and the transmitting unit, connects a first filter having the transmission pass characteristic as a pass characteristic thereof, and connects the antenna and the receiving unit, 7. The radio apparatus according to claim 1, comprising a second filter having the reception pass characteristic as a pass characteristic. 8. An antenna duplexer for sharing one antenna between a transmitter and a receiver, comprising: a first filter connecting the antenna and the transmitter;
An antenna duplexer comprising a second filter that connects the antenna and the receiver, wherein the pass characteristics of these filters are changed according to an external control signal.