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1. 发明授权

US5010269A SAW resonator having a broad bandwidth 失效
标题翻译：具有宽带宽的SAW谐振器
公开(公告)号：US5010269A
公开(公告)日：1991-04-23
申请号：US282177
申请日：1988-12-09
申请人： Mitsutaka Hikita , Atsushi Sumioka , Toyoji Tabuchi , Kazuhito Kurosawa , Tuneo Kinoshita
发明人： Mitsutaka Hikita , Atsushi Sumioka , Toyoji Tabuchi , Kazuhito Kurosawa , Tuneo Kinoshita
IPC分类号： H03H3/08 , H03H9/145 , H03H9/25
CPC分类号： H03H9/14505 , H03H9/25
摘要： A SAW resonator includes resonating SAW transducer units formed on a piezoelectric substrate and juxtaposed in a direction of propagation of acoustic waves, and a unidirectionally reflecting SAW transducer unit provided in each end of the juxtaposed resonating SAW transducer units on the substrate. Each resonating SAW transducer unit includes first and second SAW transducers connected in series and/or in parallel with each other. Each unidirectionally reflecting SAW transducer unit includes first and second comb-like electrodes having a plurality of first second fingers, respectively, formed on the substrate, in which: two second fingers are interposed between each pair of adjacent two first fingers; at least one reflective stripe is provided between the two second fingers interposed between at least one pair of adjacent two first fingers; and the distances between the reflective stripe and the two second fingers and the widths of the two second fingers are determined such that acoustic waves produced by the fingers of the reflecting SAW transducer units and propagating in a first direction perpendicular to the direction of the length of the fingers and reflected by the reflective stripe in a second direction perpendicular to the first direction are in phase with acoustic waves propagating in the second direction and acoustic waves produced by the fingers of the reflecting SAW transducer units and propagating in the second direction and reflected by the reflective stripe in the first direction are out of phase with acoustic waves propagating in the first direction.
摘要翻译： SAW谐振器包括形成在压电基板上并且在声波传播方向上并置的谐振SAW传感器单元，以及设置在基片上并置的谐振SAW换能器单元的每一端的单向反射SAW换能器单元。每个谐振SAW换能器单元包括彼此串联和/或并联连接的第一和第二SAW换能器。每个单向反射SAW换能器单元包括分别形成在基板上的多个第一第二指状物的第一和第二梳状电极，其中：两个第二指状物插入在每对相邻的两个第一指状物之间; 在插入在至少一对相邻的两个第一指状物之间的两个第二指状物之间提供至少一个反射条纹; 并且确定反射条和两个第二指状物之间的距离和两个第二指状物的宽度，使得由反射SAW换能器单元的指状物产生的声波在垂直于第二指状物的长度方向的第一方向上传播手指并且在与第一方向垂直的第二方向上由反射条纹反射，与在第二方向上传播的声波和由反射SAW换能器单元的指状产生的声波相同，并且在第二方向上传播并由第在第一方向上的反射条纹与在第一方向上传播的声波不同相。

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