Piezoelectric resonator
First Claim
1. A piezoelectric resonator comprising:
- a laminated structure including at least one first piezoelectric layer which has a positive temperature coefficient of a resonant frequency and at least one second piezoelectric layer which has a negative temperature coefficient of a resonant frequency;
at least a pair of electrodes interposing at least one of the first and second piezoelectric layers; and
a substrate supporting the laminated structure and holding a portion of the laminated structure such that the holding portion vibrates by applying a voltage across the pair of electrodes.
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Abstract
A piezoelectric resonator includes a laminated structure having a piezoelectric laminate, at least one pair of electrodes and a substrate. The piezoelectric laminate includes at least one first piezoelectric layer having a positive temperature coefficient of a resonant frequency and at least one second piezoelectric layer which has a negative temperature coefficient of a resonant frequency. The at least one pair of electrodes interpose at least one of the first and second piezoelectric layers. The substrate supports the laminated structure and holds a portion of the laminated structure such that a suspended portion of the laminated structure vibrates in response to application of a voltage across the pair of electrodes.
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Citations
20 Claims
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1. A piezoelectric resonator comprising:
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a laminated structure including at least one first piezoelectric layer which has a positive temperature coefficient of a resonant frequency and at least one second piezoelectric layer which has a negative temperature coefficient of a resonant frequency;
at least a pair of electrodes interposing at least one of the first and second piezoelectric layers; and
a substrate supporting the laminated structure and holding a portion of the laminated structure such that the holding portion vibrates by applying a voltage across the pair of electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 19)
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17. A filter comprising:
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an input terminal;
an output terminal;
first and second piezoelectric resonators each including;
a laminated structure including at least one first piezoelectric layer which has a positive temperature coefficient of a resonant frequency and at least one second piezoelectric layer which has a negative temperature coefficient of a resonant frequency;
at least a pair of electrodes interposing at least one of the first and second piezoelectric layers; and
a substrate supporting the laminated structure and holding a portion of the laminated structure such that the holding portion vibrates by applying a voltage across the pair of electrodes;
wherein the first piezoelectric resonator is connected between the input terminal and the output terminal to define a series arm and the second piezoelectric resonator is connected between the series arm and a ground level to define a series arm. - View Dependent Claims (18, 20)
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Specification