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1. 发明授权

US4760359A Surface acoustic wave resonator 失效
标题翻译：表面声波谐振器
公开(公告)号：US4760359A
公开(公告)日：1988-07-26
申请号：US763
申请日：1987-01-06
申请人： Takashi Shiba , Norio Hosaka , Takemitsu Buma , Jun Yamada
发明人： Takashi Shiba , Norio Hosaka , Takemitsu Buma , Jun Yamada
IPC分类号： H03H9/02 , H03H9/25
CPC分类号： H03H9/0285 , H03H9/25
摘要： A surface acoustic wave resonator has two solid-type interdigital transducers and two grating reflectors arranged on a piezoelectric substrate or on a surface acoustic wave substrate which contains a piezoelectric material and the reflectors are arranged outside these transducers. If the electrode pitch of the interdigital transducers is suitably different from the pitch of grating of the reflectors, ripples caused by the triple transit echo at frequencies other than the peak frequency are deviated so as to lie outside the stop band of the reflectors, so that spurious responses are suppressed. In this case, the number of electrode pairs Ni of the interdigital transducers should satisfy a relation, Ni.gtoreq..pi./.epsilon., wherein .epsilon. denotes a characteristic mechanical impedance mismatch contribution on the surface of the electrode and on the free surface in the interdigital transducers, so that a peak caused by the trapping of energy in the interdigital transducers is brought into agreement with a peak caused by the triple transit echo to decrease the losses and to increase the Q value.
摘要翻译：表面声波谐振器具有两个固体型叉指式换能器和布置在压电基片上的两个光栅反射器或包含压电材料的表面声波基片，反射器设置在这些换能器之外。如果叉指式换能器的电极间距适当地不同于反射器的光栅的间距，则在峰值频率以外的频率处由三次转接回波引起的波纹偏离，以便位于反射器的阻带之外，使得杂散响应被抑制。在这种情况下，叉指式换能器的电极对Ni的数量应满足关系式，其中，ε表示在电极表面上和叉指中的自由表面上的特征性机械阻抗失配贡献换能器，使得由叉指式换能器中的能量捕获引起的峰值与由三通道回波引起的峰值相一致，以减少损耗并增加Q值。

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