Film-bulk acoustic wave resonator with motion plate
First Claim
1. A method for utilizing a film-bulk acoustic resonator with a motion plate to detect a change in a target environmental variable, the method including:
- forming a film-bulk acoustic resonator (FBAR) that includes a surface and at least one resonant property on a first wafer;
suspending a motion plate in space;
forming a capacitive connection between the motion plate and the FBAR;
wherein changes in the capacitance between the motion plate and the FBAR causes a change in the resonant property of the FBAR; and
detecting a change in the target environmental variable by employing the FBAR and motion plate to detect a change in the resonant property of the FBAR.
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Accused Products
Abstract
An apparatus and method for measuring a target environmental variable (TEV) that employs a film-bulk acoustic resonator with motion plate. The film-bulk acoustic resonator (FBAR) includes an acoustic reflector formed in an FBAR wafer and a surface. A first electrode is formed on the surface of the acoustic reflector and has a surface. A piezoelectric layer is formed on the surface of the first electrode and has a surface. A second electrode is formed on the surface of the piezoelectric layer. A motion plate is suspended in space at a predetermined distance relative to the surface of the second electrode and is capacitively coupled to the FBAR.
169 Citations
20 Claims
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1. A method for utilizing a film-bulk acoustic resonator with a motion plate to detect a change in a target environmental variable, the method including:
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forming a film-bulk acoustic resonator (FBAR) that includes a surface and at least one resonant property on a first wafer;
suspending a motion plate in space;
forming a capacitive connection between the motion plate and the FBAR;
wherein changes in the capacitance between the motion plate and the FBAR causes a change in the resonant property of the FBAR; and
detecting a change in the target environmental variable by employing the FBAR and motion plate to detect a change in the resonant property of the FBAR. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A target environmental variable detection apparatus comprising:
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a first film-bulk acoustic resonator (FBAR) that includes a FBAR wafer;
anacoustic reflector formed in a FBAR wafer that includes a surface;
a first electrode formed on the surface of the acoustic reflector;
wherein the first electrode includes a surface;
a piezoelectric layer formed on the surface of the first electrode;
wherein the piezoelectric layer includes a surface;
a second electrode formed on the surface of the piezoelectric layer; and
a motion plate suspended in space;
wherein the motion plate is capacitively coupled to the first FBAR. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification