| 摘要 |
A purpose of the present invention is to improve a reception sensitivity when simultaneous transmitting/receiving operations are not carried out in a mobile communication apparatus capable of performing the simultaneous transmitting/receiving operations. The mobile communication apparatus, according to the present invention, is comprised of an antenna selector ( 13 ) for switching a connection between a first antenna A ( 11 ) and a second antenna B ( 12 ), and is selectively connected with a transmission system which contains a transmission-side filter ( 14 ) and a transmitting unit ( 16 ), and with respect to a reception system which contains a reception-side filter ( 15 ) and a receiving unit ( 17 ). In the antenna selector ( 13 ), at timing for performing a transmitting operation, the transmission system is connected to any one of the antennas A ( 11 ) and B ( 12 ) by way of switches A ( 21 ) and C ( 23 ); at timing for performing a receiving operation, the reception system is connected to any one of the antennas A ( 11 ) and B ( 12 ) by way of switches B ( 22 ) and D ( 24 ); and at timing for executing transmitting/receiving operations at the same time, both the transmission-side filter ( 14 ) and the reception-side filter ( 15 ) are connected to any one of the antennas A ( 11 ) and B ( 12 ) by way of the switches A ( 21 ), B ( 22 ), C ( 23 ), and D ( 24 ), so that an antenna commonly-operable device is constructed.
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