发明授权
- 专利标题： Surface acoustic wave device, equipment including the same with electric circuit connected thereto and measuring method of parameters thereof
- 专利标题（中）： 声表面波装置，与其连接的电路相同的设备及其参数的测量方法
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申请号： US452704申请日： 1995-05-30
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公开(公告)号： US5729076A公开(公告)日： 1998-03-17
- 发明人: Yoshihiro Yamada , Takashi Shiba , Katsumi Itoh
- 申请人： Yoshihiro Yamada , Takashi Shiba , Katsumi Itoh
- 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： JPX4-240977 19920909
- 主分类号： G01R29/22
- IPC分类号： G01R29/22 ; H03H9/02 ; H03H9/145 ; H03H9/64
摘要：
A surface acoustic wave device having a novel structure capable of restricting TTE and ripple noise on a frequency characteristics and group delay time characteristics thereof is provided under a condition by which acoustic reflection is suppressed when there is internal dissipation in the device and/or a peripheral circuit thereof. When the device includes a unidirectional interdigital transducer, it is possible to restrict ripple of the frequency characteristics and the group delay time characteristics and to reduce loss without using a phase shifter. By using the surface acoustic wave device according to the present invention, a communication apparatus can be improved in performance.
公开/授权文献
- US5028348A Magnetic material for high frequencies 公开/授权日：1991-07-02
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