Surface acoustic wave filter

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专利汇可以提供Surface acoustic wave filter专利检索,专利查询,专利分析的服务。并且PURPOSE:To reduce the insertion loss and to suppress the pass band ripples due to a TTE by using two unidirectional comb-shaped converters to constitute a surface acoustic wave converter. CONSTITUTION:A weighted bidirectional comb-shaped converter 22 is used as an input converter 22 of a surface acoustic wave filter; while unidirectional comb- shaped converters 21 and 23 are used as output converters 21 and 23 respectively. A group type unidirectional converter 31 or another type converter using a 3dBMSC (multi-strip coupler) is used as the unidirectional comb-shaped converter. With use of the unidirectional comb-shaped converter as the converters 21 and 22, the surface acoustic waves 7 and 8 are not reflected owing to the unidirectivity nor return to a bidirectional comb-shaped converter 7. This suppresses the generation of a TTL (triple transit echo).,下面是Surface acoustic wave filter专利的具体信息内容。

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