发明授权
US06975185B2 Surface acoustic wave filter and surface acoustic wave duplexer having the same
有权
表面声波滤波器和表面声波双工器具有相同的性能
- 专利标题： Surface acoustic wave filter and surface acoustic wave duplexer having the same
- 专利标题（中）： 表面声波滤波器和表面声波双工器具有相同的性能
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申请号： US10671783申请日： 2003-09-29
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公开(公告)号： US06975185B2公开(公告)日： 2005-12-13
- 发明人: Jun Tsutsumi , Shogo Inoue , Takashi Matsuda , Masanori Ueda
- 申请人： Jun Tsutsumi , Shogo Inoue , Takashi Matsuda , Masanori Ueda
- 申请人地址： JP Yokohama JP Kawasaki
- 专利权人： Fujitsu Media Devices Ltd.,Fujitsu Limited
- 当前专利权人： Fujitsu Media Devices Ltd.,Fujitsu Limited
- 当前专利权人地址： JP Yokohama JP Kawasaki
- 代理机构： Arent Fox, PLLC.
- 优先权： JP2002-284867 20020930
- 主分类号： H03H9/145
- IPC分类号： H03H9/145 ; H03H9/64 ; H03H9/72
摘要：
A surface acoustic wave filter includes a series-arm resonators and parallel-arm resonators that are connected in a ladder-like structure, each having an interdigital transducer formed on a piezoelectric substrate, and at least one of the series-arm resonators having a different static capacitance from the other series-arm resonators. In this surface acoustic wave filter, at least one of the series-arm resonators except the series-arm resonator located at the first stage in the ladder-like structure has a lower average resonant frequency than the other series-arm resonators.
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