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    • 6. 发明授权
    • Duplexer and communication apparatus using the same
    • 双工器和使用其的通信设备
    • US07868715B2
    • 2011-01-11
    • US12091428
    • 2006-10-26
    • Motoki Ito
    • Motoki Ito
    • H03H9/72H03H9/64
    • H03H9/0576H03H9/725
    • The present invention provides a duplexer using a ladder-type filter, which has a small size and is superior in isolation characteristic, and a communication apparatus using such a duplexer. A series resonator (R1) contained in a first filter element (F1) and a parallel resonator (R4) contained in a second filter element (F2) are disposed so as not to allow the elastic wave propagating paths to be overlapped with each other. By disposing them in this manner, it is possible to prevent an elastic wave, leaked from the series resonator (R1) and most influential to the isolation characteristic, from being received by the parallel resonator (R4). Consequently, it is possible to achieve a small-size duplexer that is superior in isolation characteristic.
    • 本发明提供一种使用具有小尺寸并且隔离特性优异的梯形滤波器的双工器,以及使用这种双工器的通信装置。 包含在包含在第二滤波器元件(F2)中的第一滤波器元件(F1)和并联谐振器(R4)中的串联谐振器(R1)被布置成不允许弹性波传播路径彼此重叠。 通过以这种方式设置它们,可以防止从串联谐振器(R1)泄漏并且最有影响隔离特性的弹性波被并联谐振器(R4)接收。 因此,可以实现隔离特性优异的小型双工器。