Acoustic resonator device with structures having different apodized shapes
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United States of America Patent
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Feb 14, 2017
Grant Date -
Apr 28, 2016
app pub date -
Oct 28, 2014
filing date -
Oct 28, 2014
priority date (Note) -
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Abstract
An acoustic resonator device includes a bottom electrode disposed on a substrate over an acoustic reflecting feature, a piezoelectric layer disposed on the bottom electrode and a top electrode disposed on the piezoelectric layer, where an overlap between the top electrode, the piezoelectric layer and the bottom electrode over the acoustic reflecting feature define an active region of the acoustic resonator device. The acoustic resonator device further includes at least one of a wing having an outer edge extending beyond at least a portion of an outer edge of the top electrode, and a first frame formed in one of an outer region or a center region of the top electrode. The at least one of the wing and the first frame has an apodized shape, such that no edges are parallel to one another, the apodized shape of the at least one of the wing and the first frame being different from an electrode shape defined by an outer edge of the top electrode.
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