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Stacked bulk acoustic resonator

  • US 8,575,820 B2
  • Filed: 03/29/2011
  • Issued: 11/05/2013
  • Est. Priority Date: 03/29/2011
  • Status: Active Grant
First Claim
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1. A stacked bulk acoustic resonator, comprising:

  • a first piezoelectric layer stacked on a first electrode;

    a second electrode stacked on the first piezoelectric layer;

    a second piezoelectric layer stacked on the second electrode;

    a third electrode stacked on the second piezoelectric layer;

    an inner raised region formed on an inner portion of a surface of at least one of the first, second and third electrodes; and

    an outer raised region formed along an outer perimeter of the surface of the at least one of the first, second and third electrodes, the outer raised region surrounding the inner raised region and defining a gap between the inner raised region and the outer raised region.

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