| 摘要 |
PROBLEM TO BE SOLVED: To provide a branching filter employing a surface acoustic filter capable of improving power resistance. SOLUTION: The SAW branching filter has a transmitting filter and a receiving filter which have different pass band. In the filter, the transmitting filter consists of surface acoustic wave resonators connected in a ladder, the receiving filter is configured by cascade-connecting first and second longitudinally coupled dual mode filters, the first longitudinally coupled dual mode filter is provided with a first terminal on one end side and second and third terminals on the other end side, the second longitudinally coupled dual mode filter is provided with a fourth terminal on one end side and fifth and sixth terminals on the other end side, and the second, third, fifth and sixth terminals are commonly connected using a wiring. COPYRIGHT: (C)2007,JPO&INPIT
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