发明授权
US4500807A Surface acoustic wave transmission device for a low frequency signal
below 30 MHz
失效
用于30 MHz以下低频信号的表面声波传输装置
- 专利标题： Surface acoustic wave transmission device for a low frequency signal below 30 MHz
- 专利标题（中）： 用于30 MHz以下低频信号的表面声波传输装置
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申请号： US455280申请日： 1983-01-03
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公开(公告)号： US4500807A公开(公告)日： 1985-02-19
- 发明人: Akitsuna Yuhara , Norio Hosaka , Yuji Fujita , Kiyoharu Kishimoto , Jun Yamada
- 申请人： Akitsuna Yuhara , Norio Hosaka , Yuji Fujita , Kiyoharu Kishimoto , Jun Yamada
- 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： JPX57-1826 19820111
- 主分类号： H03H9/25
- IPC分类号： H03H9/25 ; H03H3/08 ; H03H9/02
摘要：
Disclosed is a surface acoustic wave transmission device comprising a piezoelectric substrate provided thereon with an input and output transducers for transmitting and receiving the surface acoustic wave, a package for accommodating the piezoelectric substrate, and an adhesion layer for fixing the bottom of the piezoelectric substrate to the ground plane of the package. The adhesion layer is made to have a thickness of .lambda..sub.R /2.6 or more wherein .lambda..sub.R : is the wave length of the surface acoustic wave at the main lobe of the operating frequency, so that unnecessary waves caused by bulk wave components are absorbed.
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