发明申请
- 专利标题： FILTER, DUPLEXER AND ELECTRONIC DEVICE
- 专利标题（中）： 过滤器，双面器和电子设备
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申请号： US13131833申请日： 2008-11-28
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公开(公告)号： US20110227807A1公开(公告)日： 2011-09-22
- 发明人: Masafumi Iwaki , Tokihiro Nishihara , Masanori Ueda
- 申请人： Masafumi Iwaki , Tokihiro Nishihara , 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
- 国际申请： PCT/JP2008/071683 WO 20081128
- 主分类号： H03H9/54
- IPC分类号： H03H9/54 ; H03H9/70 ; H01Q1/50
摘要：
A ladder type filter includes series resonators S1˜S4 connected in series between an input terminal In and an output terminal Out, parallel resonators P1˜P3 connected in parallel between the input terminal In and the output terminal Out, a resonator RP connected in series with the series resonators S1˜S4 between the input terminal and the output terminal, the resonator RP having a resonance frequency lower than resonance frequencies of the series resonators S1˜S4, and an inductor Lp connected in parallel with the resonator. According to the present ladder filter, signals having frequencies away from the pass band can be suppressed by an attenuation pole formed by the inductor. It is further possible to suppress the insertion loss in the pass band by the resonator.
公开/授权文献
- US08912971B2 Filter, duplexer and electronic device 公开/授权日：2014-12-16
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