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发明授权
CN1921301B 表面声波元件 失效 - 权利终止

表面声波元件
摘要：
一种表面声波元件，该表面声波元件包括一压电基板，一第一换能器及一第二换能器，该第一换能器与该第二换能器设于该压电基板同一表面上，且该第一换能器与该第二换能器声耦合；其中，每一换能器包括一第一电极及一第二电极，该第一电极与第二电极极性相反、相互并列并分别围成一螺旋，每一螺旋的螺距为一个表面声波波长。相较现有技术，本表面声波元件的电极交互围绕成一螺旋状，因而其重叠长度长，可有效降低插入损耗。另外，螺旋状电极的长短、宽度及间距等参数，可在设计上不断变化，从而控制表面声波元件的插入损耗、频宽及表面声波速度等参数，从而提高表面声波元件及其应用系统的设计自由度。
摘要（英）：

The invention relates to a surface sonic wave element, which comprises one piezoelectric base plate, the first energy exchanger and the second energy exchanger that on the base plate and coupled. Wherein, at least one energy exchanger has two electrodes parallel in screw shape. Compared with present technique, the inventive electrodes are alternated into screw shape, to obtain long supposition length and reduce the insertion consumption; in addition, the parameters of screw electrode as length, etc can be changed to control the insertion consumption, frequency width, etc.

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