发明授权
- 专利标题: Surface acoustic wave filter of multi-stage connection type
- 专利标题(中): 多级连接型表面声波滤波器
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申请号: US041784申请日: 1998-03-13
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公开(公告)号: US5999068A公开(公告)日: 1999-12-07
- 发明人: Jun Tsutsumi , Osamu Ikata , Yoshio Satoh
- 申请人: Jun Tsutsumi , Osamu Ikata , Yoshio Satoh
- 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: JPX9-234216 19970829
- 主分类号: H03H9/145
- IPC分类号: H03H9/145 ; H03H9/25 ; H03H9/64
摘要:
A surface acoustic wave filter of multi-stage connection type including a plurality of surface acoustic wave filters formed on a piezoelectric substrate and a connection section for electrically connecting the surface acoustic wave filters in a cascade connection. Each of the surface acoustic wave filters includes interdigital transducers with two signal terminals for electric input and output, each interdigital transducer including an excitation section for exciting a surface acoustic wave and two terminal sections disposed on opposite sides of the excitation section, the two terminal sections serving as input or output terminal for electric signal and ground terminal. One of the signal terminal sections is connected to the connection section, and an electrode area of said one of the signal terminal sections is adjusted so that a parasitic capacitance formed between said one of the signal terminal sections and a grounding point of the surface acoustic wave filter is less than or equal to 0.01 pF.
公开/授权文献
- USD371940S Food container 公开/授权日:1996-07-23