| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface acoustic wave device, the steepness and the attenuation of which are improved by properly combining a thinning weighting depending on with/without reflection of a surface acoustic wave on IDTs with a thinning weighting depending on with/without excitation of the surface acoustic wave. SOLUTION: A surface acoustic wave chip includes: a first IDT 14, a second IDT 16, and a third IDT 18 arranged along a propagation direction of a surface acoustic wave on a piezoelectric substrate; and a pair of reflectors provided by sandwiching the IDTs 14, 16, 18. Each of the IDTs 14, 16, 18 is formed intermingledly with: electrode cells A capable of exciting and reflecting the surface acoustic wave; electrode cells B capable of exciting but not reflecting the surface acoustic wave; an electrode cell C incapable of exciting the surface acoustic wave but capable of reflecting the surface acoustic wave; and an electrode cell D not exciting the surface acoustic wave nor reflecting the surface acoustic wave. COPYRIGHT: (C)2007,JPO&INPIT
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