ACOUSTIC STRUCTURE HAVING TUNABLE PARALLEL RESONANCE FREQUENCY
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United States of America
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Issued Date -
Mar 26, 2020
app pub date -
Apr 16, 2019
filing date -
Apr 16, 2019
priority date (Note) -
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status (Latency Note)
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Abstract
An acoustic structure is provided. The acoustic structure includes an acoustic resonator structure configured to resonate in a series resonance frequency (e.g., passband frequency) to pass a signal, or cause a series capacitance to block the signal in a parallel resonance frequency (e.g., stopband frequency). The parallel resonance frequency may become higher than the series resonance frequency when the tunable capacitance is lesser than or equal to two times of the series capacitance (CTune≤2C0), or lower than the series resonance frequency when the tunable capacitance is greater than two times of the series capacitance (CTune>2C0). In this regard, the acoustic structure can be configured to include a tunable reactive circuit to generate the tunable capacitance (CTune) to adjust the parallel resonance frequency. As such, it may be possible to flexibly configure the acoustic resonator structure to block the signal in desired stopband frequencies.
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