| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface acoustic wave device wherein a frequency region providing a greater attenuation is extended without increasing the insertion loss. SOLUTION: The surface acoustic wave device has: a plurality of serial arm resonators 54 to 56 connected in series and placed between an input terminal IN and an output terminal OUT; and a plurality of parallel arm resonators 57 to 60 placed in parallel between the serial arm resonators and ground terminals GND. The anti-resonance frequencies of all the parallel arm resonators 57 to 60 are selected nearly equal to each other, and the resonance frequency of the parallel arm resonators 57, 58 resonate at the resonance frequency different from the other parallel arm resonators 58, 59. COPYRIGHT: (C)2004,JPO
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