发明授权
US5115216A Surface acoustic wave filter including saw resonators with transmission
spaces therein
失效
表面声波滤波器，包括带有传输空间的SAW谐振器
- 专利标题： Surface acoustic wave filter including saw resonators with transmission spaces therein
- 专利标题（中）： 表面声波滤波器，包括带有传输空间的SAW谐振器
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申请号： US335140申请日： 1989-04-07
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公开(公告)号： US5115216A公开(公告)日： 1992-05-19
- 发明人: Mitsutaka Hikita , Toyoji Tabuchi , Kazuhito Kurosawa , Nobuhiko Shibagaki
- 申请人： Mitsutaka Hikita , Toyoji Tabuchi , Kazuhito Kurosawa , Nobuhiko Shibagaki
- 申请人地址： JPX Tokyo
- 专利权人： Hitachi, Ltd.
- 当前专利权人： Hitachi, Ltd.
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX63-87380 19880411
- 主分类号： H03H9/145
- IPC分类号： H03H9/145 ; H03H3/08 ; H03H9/02 ; H03H9/25 ; H03H9/64
摘要：
Disclosed is a SAW filter employing a SAW resonator which is constructed of a plurality of pairs of electrode fingers formed on a piezoelectric substrate, and in which a plurality of SAW transmission spaces are included. The SAW transmission spaces do not have the function of exciting a SAW, and they have electric lengths which match the phases of SAWs excited by the resonator. In accordance with frequency characteristics required of the filter, such SAW transmission spaces are introduced into, for example, one of a plurality of SAW resonators located on the electric power input side of the filter.
公开/授权文献
- US4700032A Keyboard apparatus and method for making same 公开/授权日：1987-10-13
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