发明申请
- 专利标题： FILTER, DUPLEXER AND COMMUNICATION APPARATUS
- 专利标题（中）： 过滤器，双工器和通信设备
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申请号： US12494990申请日： 2009-06-30
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公开(公告)号： US20100060384A1公开(公告)日： 2010-03-11
- 发明人: Shinji TANIGUCHI , Tokihiro Nishihara , Tsuyoshi Yokoyama , Masafumi Iwaki , Motoaki Hara , Takeshi Sakashita , Masanori Ueda
- 申请人： Shinji TANIGUCHI , Tokihiro Nishihara , Tsuyoshi Yokoyama , Masafumi Iwaki , Motoaki Hara , Takeshi Sakashita , Masanori Ueda
- 申请人地址： JP Kawasaki
- 专利权人： FUJITSU LIMITED
- 当前专利权人： FUJITSU LIMITED
- 当前专利权人地址： JP Kawasaki
- 优先权： JP2008-231255 20080909
- 主分类号： H03H9/205
- IPC分类号： H03H9/205 ; H01L41/04
摘要：
A filter has a plurality of piezoelectric thin film resonators formed by sandwiching a piezoelectric film with a lower electrode disposed on a substrate and an upper electrode. Each of the piezoelectric thin film resonators has an electrode region formed with the upper electrode and the lower electrode overlapping each other, whose outline includes a curve. Among the plural piezoelectric thin film resonators, the piezoelectric thin film resonators in the opposing electrode regions of the adjacent piezoelectric thin film resonators are shaped to have outlines complementary to each other. With the filter, influences caused by transverse mode undesired wave of the piezoelectric thin film resonators can be suppressed. Therefore, miniaturization can be achieved without sacrificing the mechanical strength of electrodes having hollow structures.
公开/授权文献
- US08093962B2 Filter, duplexer and communication apparatus 公开/授权日：2012-01-10
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