- 专利标题： Surface acoustic wave filter
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申请号： US965774申请日： 1992-10-23
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公开(公告)号： US5559481A公开(公告)日： 1996-09-24
- 发明人: Yoshio Satoh , Osamu Ikata , Tsutomu Miyashita , Takashi Matsuda , Mitsuo Takamatsu
- 申请人： Yoshio Satoh , Osamu Ikata , Tsutomu Miyashita , Takashi Matsuda , Mitsuo Takamatsu
- 申请人地址： JPX Kawasaki
- 专利权人： Fujitsu Limited
- 当前专利权人： Fujitsu Limited
- 当前专利权人地址： JPX Kawasaki
- 优先权： JPX3-281694 19911028; JPX4-032270 19920219
- 主分类号： H03H9/10
- IPC分类号： H03H9/10 ; H03H9/64 ; H03H9/72
摘要：
A SAW filter includes a first SAW resonator having a pair of terminals and a predetermined resonance frequency (f.sub.rp), the first SAW resonator being provided in a parallel arm of the SAW filter. A second SAW resonator has a pair of terminals and a predetermined resonance frequency (f.sub.rs) approximately equal to a predetermined antiresonance frequency of the first SAW resonator (f.sub.ap). The second SAW resonator is provided in a series arm of the SAW filter. An inductance element is connected in series to the first SAW resonator.
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