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Surface acoustic wave duplexer and communication apparatus

  • US 6,781,479 B2
  • Filed: 07/30/2002
  • Issued: 08/24/2004
  • Est. Priority Date: 07/30/2001
  • Status: Active Grant
First Claim
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1. A surface acoustic wave duplexer comprising:

  • a multi-layer substrate including a plurality of layers;

    a branching section provided on said substrate, said branching section including a plurality of surface acoustic wave filters arranged to perform a branching function for transmission and reception;

    an antenna terminal, a transmission terminal, a receiving terminal, and a ground terminal each connected to the branching section and provided at a peripheral portion of the substrate; and

    a stripline having a matching function being provided on a single layer of the plurality of layers such that one end thereof is connected to the antenna terminal and the other end thereof is connected to a ground terminal disposed on at least one side other than a side opposite to a side where the antenna terminal is located.

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