| 摘要 |
PURPOSE:To make the filter band broad without narrowing the width of each resonator by arranging input/output surface acoustic wave resonators alternately, and connecting in parallel the resonators having a function taking notice of whether each is for input or output. CONSTITUTION:Input surface acoustic wave resonators 21, 23 and output surface acoustic wave resonators 22, 24 are arranged alternately. The input surface acoustic wave resonators 21, 23 are connected electrically in parallel and connected to the input terminal IN. The output surface acoustic wave resonators 22, 24 are connected electrically in parallel and connected to an output terminal OUT. That is, the resonators having the same function taking notice of whether the input or output are connected electrically. Thus, the broad band is attained without making the width of each resonator narrow.
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