Surface acoustic wave filter and wireless device that employs the same

Surface acoustic wave filter and wireless device that employs the same

  • CN 1,619,957 B
  • Filed: 11/19/2004
  • Issued: 06/15/2011
  • Est. Priority Date: 11/21/2003
  • Status: Active Grant
First Claim
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1. surface acoustic wave filter, it comprises:

  • Piezoelectric substrate;

    Second interdigital transducer that is arranged on first interdigital transducer that is used to import on the described piezoelectric substrate and is used to export, described first interdigital transducer and second interdigital transducer are provided with along the direction of propagation;

    AndBucking electrode is arranged between described first interdigital transducer and described second interdigital transducer, and/or is arranged between many interconnection lines, and described many interconnection lines connect described first interdigital transducer and described second interdigital transducer,In described first interdigital transducer and described second interdigital transducer at least one is the longitudinal coupling multimode type with balancing run,Wherein, the earth potential that links to each other with described bucking electrode is different from and described first interdigital transducer and one of them earth potential that links to each other of described second interdigital transducer,Wherein said bucking electrode has a plurality of electrodes that are inserted between described first interdigital transducer and described second interdigital transducer and refers to.

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