| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a portable radio device which can reduce the circuit scale dramatically by filter sharing and which can restrain generation of noises due to filter sharing. <P>SOLUTION: A portable radio device having multiple radio access systems comprises a filter to be shared by no less than two transmission/reception signals whose frequency bandwidths to be used are only partially overlapped, on the condition that a transmission filter in an optional radio access system of the portable radio device and a reception filter used in the same radio access system and the same frequency bandwidth as the transmission filter are not shared. <P>COPYRIGHT: (C)2012,JPO&INPIT |
