Method of making tunable thin film acoustic resonators
First Claim
1. A method for fabricating an acoustical resonator, the method comprising:
- depositing a sacrificial layer on a substrate;
etching vias in said sacrificial layer;
depositing metal in said vias;
depositing a bottom metallic layer on said sacrificial layer;
depositing a PZ layer on said bottom metallic layer;
depositing a top metallic layer on said PZ layer; and
removing said sacrificial layer leaving a portion of said bottom metallic layer separated from said substrate.
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Abstract
An acoustical resonator comprising top and bottom electrodes that sandwich a PZ layer. The resonance frequency of the acoustical resonator may be adjusted after fabrication by utilizing heating elements included in the acoustical resonator and/or by adjusting the thickness of a tuning layer. In the preferred embodiment of the present invention, the electrodes comprise Mo layers. One embodiment of the present invention is constructed on a Si3 N4 membrane. A second embodiment of the present invention is constructed such that it is suspended over a substrate on metallic columns. In the preferred embodiment of the present invention, the electrodes are deposited by a method that minimizes the stress in the electrodes.
343 Citations
12 Claims
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1. A method for fabricating an acoustical resonator, the method comprising:
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depositing a sacrificial layer on a substrate; etching vias in said sacrificial layer; depositing metal in said vias; depositing a bottom metallic layer on said sacrificial layer; depositing a PZ layer on said bottom metallic layer; depositing a top metallic layer on said PZ layer; and removing said sacrificial layer leaving a portion of said bottom metallic layer separated from said substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification