Thin film piezoelectric resonator
First Claim
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1. A thin film piezoelectric resonator, comprising:
- a lower electrode layer and an upper electrode layer;
a piezoelectric layer between said lower electrode layer and said upper electrode layer;
an additional layer disposed on said upper electrode layer, said additional layer being structured with etching structures selected from the group consisting of holes and islands spaced at less than a wavelength of an operating wavelength of the resonator, for setting a prescribed resonant frequency of the piezoelectric resonator.
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Abstract
The layer of the cover electrode, or an additional layer on the cover electrode is formed with holes, preferably produced lithographically, or similar structures. The structures have a mean spacing from one another which is smaller than the wavelength for operating the component. The structures are preferably distributed with a uniformity sufficient to effect a uniform change in the mass of the layer per area, thus producing a specific setting of the resonant frequency/ frequencies, and are preferably, on the other hand, distributed so irregularly that diffraction effects are avoided.
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5 Claims
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1. A thin film piezoelectric resonator, comprising:
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a lower electrode layer and an upper electrode layer;
a piezoelectric layer between said lower electrode layer and said upper electrode layer;
an additional layer disposed on said upper electrode layer, said additional layer being structured with etching structures selected from the group consisting of holes and islands spaced at less than a wavelength of an operating wavelength of the resonator, for setting a prescribed resonant frequency of the piezoelectric resonator. - View Dependent Claims (2, 3, 4, 5)
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Specification