Patent ID: 6788170
Filing Date: 2004-09-07
Classification: H03H

Abstract:
A resonator structure (600, 800, 810, 820) comprising two conductor layers (110, 120) and a piezoelectric layer (100) in between the conductor layers, said resonator having a first area over which said conductor layers and said piezoelectric layer extend, which first area is a piezoelectrically excitable area of the resonator structure, characterized in that the resonator structure further comprises at least one layer (801, 803, 804) of dampening material located between one of the conductor layers and the piezoelectric layer, said material dampening vibrations effectively, said at least one layer covering a zone and having an opening (802) in the first area, said opening uncovering at most the first area and confining a center area (604, 802) in the first area, and wherein piezoelectrically excited vibrations are dampened more effectively in the zone than in the center area.