| 摘要 |
<P>PROBLEM TO BE SOLVED: To realize a radio communication circuit which copes with a time division multiplex connection system and a code division multiplex connection system, can always receive reception signals in the code division multiplex connection system, and reduces loss in a route for the reception signals, in the code division multiplex connection system. <P>SOLUTION: A radio communication circuit 10 comprises a diplexer 21, connected to an antenna 1 and two high frequency switches 22, 23 connected to the diplexer 21. They separates transmission and reception signals in a GSM system, a DCS system and a PCS system, and transmission signals in a WCDMA system from each other. The circuit 10 further comprises a branch line 40, branching from the route of signals between the antenna 1 and the diplexer 21, and a band-pass filter 41 inserted in the branch line 40 for passing the reception signals in the WCDMA system. <P>COPYRIGHT: (C)2004,JPO |
