| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface acoustic wave element with superior characteristic which can improve shoulder characteristics of a passband by reducing deterioration due to insertion loss. SOLUTION: An IDT electrode 3 consisting of a pair of parallel common electrodes and a plurality of electrode fingers 4 extending from each of the common electrodes so as to mate with each other is formed on a piezoelectric substrate 1. Dummy electrode fingers 5 are each formed on the other common electrode so as to oppose each of the end of the electrode fingers 4 formed on the one common electrode of the IDT electrode 3. The dummy electrodes 5 are each formed so as to have a width smaller than the width of each of electrode fingers of the IDT electrode 3, and connection portions 8 with the common electrode in the electrode fingers of the IDT electrode 3 are each formed so as to have a width smaller than the width of each of the other parts 9 thereof. COPYRIGHT: (C)2007,JPO&INPIT
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