发明公开
- 专利标题: Filter combining surface acoustic wave resonators
- 专利标题(中): 滤波器组合表面声波谐波器
-
申请号: EP87117300.1申请日: 1987-11-24
-
公开(公告)号: EP0269064A3公开(公告)日: 1989-08-23
- 发明人: Hikita, Mitsutaka , Saigo, Yoichi , Kurosawa, Kazuhito
- 申请人: HITACHI, LTD. , HITACHI VIDEO ENGINEERING, INC.
- 申请人地址: 6, Kanda Surugadai 4-chome Chiyoda-ku, Tokyo 101 JP
- 专利权人: HITACHI, LTD.,HITACHI VIDEO ENGINEERING, INC.
- 当前专利权人: HITACHI, LTD.,HITACHI VIDEO ENGINEERING, INC.
- 当前专利权人地址: 6, Kanda Surugadai 4-chome Chiyoda-ku, Tokyo 101 JP
- 代理机构: Altenburg, Udo, Dipl.-Phys.
- 优先权: JP278642/86 19861125
- 主分类号: H03H9/64
- IPC分类号: H03H9/64 ; H03H9/02
摘要:
This invention relates to the structure of a band-pass or band-rejection filter by combining a plurality of one-port surface acoustic wave resonators (421 to 433 or Q₁ to Q₄) whose interdigital electrode fingers are disposed on a piezoelectric substrate (10). The filter combining surface acoustic wave resonators of the present invention consists of a series circuit of the one-port surface acoustic wave resonators (421 to 433 or 70 to 72) disposed on a piezoelectric substrate (10) for transmitting elastic surface wave and a plurality of circuit elements containing capacitance elements (431 to 433 or 70 to 72), and one-port surface acoustic wave resonators (421 to 433 or 70 to 72) disposed between the electrodes of the plurality of circuit elements and the common ground. This structure can accomplish a filter having a low loss, high power handling capability and high design freedom of rejection-and passing-band.
公开/授权文献
- EP0269064B1 Filter combining surface acoustic wave resonators 公开/授权日:1996-07-17
信息查询