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Surface acoustic wave filter

  • US 5,770,985 A
  • Filed: 06/27/1996
  • Issued: 06/23/1998
  • Est. Priority Date: 07/08/1993
  • Status: Expired due to Term
First Claim
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1. A surface acoustic wave filter having an input end and an output end, said filter comprising:

  • a piezoelectric substrate;

    a plurality of interdigital transducers located on said piezoelectric substrate and arranged along a surface wave propagation direction in a surface wave propagating region, said plurality of interdigital transducers forming a surface acoustic wave filter part having a pass band and having input and output sides directly coupled to said input and output ends of said surface acoustic wave filter, respectively; and

    a one-port SAW resonator, having at least one interdigital transducer and being connected at least between one of said input and output sides of said surface acoustic wave filter part and a ground potential, said one-port SAW resonator being located in a region of the piezoelectric substrate other than said surface wave propagating region,a resonance frequency of said one-port SAW resonator being set at a frequency region lower than the pass band of said surface acoustic wave filter part.

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