| 摘要 |
The surface acoustic wave device has the surface acoustic wave transducer, which consists of the positive electrode finger 102 , the negative electrode finger 204 , and the floating electrode 300 , which are formed on the surface of the langasite single crystal substrate, where the substrate orientation and the surface acoustic wave propagation direction are chosen so that it may have the natural unidirectional property. When the wavelength of the surface acoustic wave is lambda, each above-mentioned electrode is formed along the surface acoustic wave propagation direction, so that the width of above-mentioned positive electrode finger and the negative electrode finger may be about lambda/8, the distance g between each center of the positive electrode finger and the floating electrode may be 13/40lambda<=g<=14/40lambda, and the width W of the floating electrode may be 11/40lambda<=W<=13/40lambda.
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