Trim layers for surface acoustic wave devices
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United States of America
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Dec 10, 2024
Grant Date -
Jan 2, 2020
app pub date -
Dec 7, 2018
filing date -
Dec 7, 2018
priority date (Note) -
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status (Latency Note)
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Abstract
Trim layers that are configured to adjust one or more operating parameters for surface acoustic wave (SAW) devices are disclosed. A SAW device may include an interdigital transducer (IDT) and a piezoelectric material that are configured to generate an acoustic wave and a trim layer that has an acoustic velocity and a density that correspond to a velocity of the acoustic wave. In this manner, the trim layer may be configured to adjust an electromechanical coupling of the SAW device without significantly impacting a resonance frequency of the SAW device. The SAW device may also include an additional trim layer that is configured to adjust a coupling percentage and the resonance frequency of the SAW device. A SAW device may include a trim layer that is configured to adjust certain operating parameters by greater amounts than other operating parameters.
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