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Acoustically coupled resonators and method of making the same

  • US 7,436,269 B2
  • Filed: 04/18/2005
  • Issued: 10/14/2008
  • Est. Priority Date: 04/18/2005
  • Status: Active Grant
First Claim
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1. A single-chip duplexer comprising:

  • a first two-stage resonator filter configured to pass electrical signal having a frequency within a first range of frequencies, said first two-stage resonator filter including an input resonator, an output resonator, and two floating resonators, each resonator including piezoelectric material;

    a second two-stage resonator filter configured to pass electrical signal having a frequency within a second range of frequencies, said second two-stage resonator filter including an input resonator, an output resonator, and two floating resonators, each resonator including piezoelectric material;

    wherein a lower common piezoelectric layer is shared by said first two-stage resonator filter and by said second two-stage resonator filter; and

    wherein an upper common piezoelectric layer is shared by said first two-stage resonator filter and by said second two-stage resonator filter.

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