| 摘要 |
PROBLEM TO BE SOLVED: To provide a compound duplexer which can perform demultiplexing of both using frequency bands, even if the utilization frequency bands are close to each other, in different communications systems. SOLUTION: A receiving filter 26 of a first duplexer 30 is connected to a first receiving terminal 34; a transmission filter 28 of the first duplexer 30 is connected to a transmission terminal 36 via a second switch 32; a first switch 24 has three branch switches 40, which branch from a first antenna 22 into three; and among the three branch switches 40, any one of branch switches 40 is switched and is connected to the first duplexer 30, among the two branch switches 40; one branch switch 40 is switched and connected to a second receiving terminal 38; and the other branch terminal is switched and connected to the transmission terminal 36. COPYRIGHT: (C)2007,JPO&INPIT
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