发明公开
- 专利标题： Filter and duplexer
- 专利标题（中）： 过滤器和双工器
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申请号： EP07106274.9申请日： 2007-04-16
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公开(公告)号： EP1850479A2公开(公告)日： 2007-10-31
- 发明人: Nishihara, Tokihiro , Taniguchi, Shinji , Iwaki, Masafumi , Yokoyama, Tsuyoshi , Sakashita, Takeshi , Ueda, Masanori , Saitou, Yasuyuki
- 申请人： Fujitsu Media Devices Limited , Fujitsu Ltd.
- 申请人地址： 3-12, Shin-Yokohama 2-chome, Kohoku-ku Yokohama-shi, Kanagawa 222-0033 JP
- 专利权人： Fujitsu Media Devices Limited,Fujitsu Ltd.
- 当前专利权人： Fujitsu Media Devices Limited,Fujitsu Ltd.
- 当前专利权人地址： 3-12, Shin-Yokohama 2-chome, Kohoku-ku Yokohama-shi, Kanagawa 222-0033 JP
- 代理机构： Hitching, Peter Matthew
- 优先权： JP2006124447 20060427
- 主分类号： H03H9/56
- IPC分类号： H03H9/56 ; H03H9/70 ; H03H9/02
摘要：
A filter includes piezoelectric thin-film resonators (P1 to P4, S1 to S4) having a substrate (10), a lower electrode (12) supported by the substrate (10), a piezoelectric film (14) provided on the lower electrode, and an upper electrode (16) provided on the piezoelectric film (14). At least one of the piezoelectric thin-film resonators has a portion (22) in which the upper electrode (16) overlaps the lower electrode (12) across the piezoelectric film. The above portion has a shape different from shapes of corresponding portions of other piezoelectric thin-film resonators, so that a spurious component in the above at least one of the piezoelectric thin-film resonators occur at a frequency different from frequencies of spurious components that occur in the other piezoelectric thin-film resonators.
公开/授权文献
- EP1850479B1 Filter and duplexer 公开/授权日：2011-03-09
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