发明授权
US08125298B2 Acoustic wave filter, duplexer using the acoustic wave filter, and communication apparatus using the duplexer
有权
声波滤波器，使用声波滤波器的双工器，以及使用双工器的通信设备
- 专利标题： Acoustic wave filter, duplexer using the acoustic wave filter, and communication apparatus using the duplexer
- 专利标题（中）： 声波滤波器，使用声波滤波器的双工器，以及使用双工器的通信设备
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申请号： US12684481申请日： 2010-01-08
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公开(公告)号： US08125298B2公开(公告)日： 2012-02-28
- 发明人: Motoaki Hara , Tokihiro Nishihara , Shinji Taniguchi , Takeshi Sakashita , Tsuyoshi Yokoyama , Masafumi Iwaki , Masanori Ueda
- 申请人： Motoaki Hara , Tokihiro Nishihara , Shinji Taniguchi , Takeshi Sakashita , Tsuyoshi Yokoyama , Masafumi Iwaki , Masanori Ueda
- 申请人地址： JP Tokyo
- 专利权人： Taiyo Yuden Co., Ltd.
- 当前专利权人： Taiyo Yuden Co., Ltd.
- 当前专利权人地址： JP Tokyo
- 代理机构： Chen Yoshimura LLP
- 主分类号： H03H9/70
- IPC分类号： H03H9/70 ; H03H9/72 ; H03H9/54 ; H03H9/64
摘要：
An acoustic wave filter having excellent steepness is provided without adding any exterior components or any new manufacturing steps. A plurality of filters (10-1) each having a first resonator (2a-1) placed in a serial arm and having a resonance frequency frs and an anti-resonance frequency fas, and a second resonator (4a-1) placed in a parallel arm and having a resonance frequency frp and an anti-resonance frequency fap are provided on a same substrate, where the resonance frequency frs of the first resonator is higher than the resonance frequency frp of the second resonator; the anti-resonance frequency fas of the first resonator is higher than the anti-resonance frequency fap of the second resonator; and the filters (10-1) are connected in multiple stages. At least one of the filters (10-1) connected in multiple stages has a third resonator (6-1) having a resonance frequency frp and an anti-resonance frequency fap. The third resonator (6-1) is formed on the substrate and connected to the serial arm in parallel with respect to the first resonator (2a-1).
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