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Bulk acoustic wave resonator with improved lateral mode suppression

  • US 6,215,375 B1
  • Filed: 03/30/1999
  • Issued: 04/10/2001
  • Est. Priority Date: 03/30/1999
  • Status: Expired due to Term
First Claim
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1. A filter for absorbing energy in a frequency band, said filter comprising:

  • a PZ sheet having a first surface and a second surface;

    a first electrode comprising an electrically conducting layer on said first surface; and

    a second electrode comprising an electrically conducting layer on said second surface, wherein said first electrode overlies at least a portion of said second electrode, said portion of said second electrode having a periphery chosen such that the amplitude of any transverse mode absorption peak in said frequency band is less than one half the amplitude of any transverse mode absorption peak obtained with a rectangular periphery.

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