FILTER DEVICE, SPLITTER, AND COMMUNICATION DEVICE
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United States of America Patent
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Mar 27, 2025
app pub date -
Jan 6, 2023
filing date -
Jan 6, 2023
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Abstract
In a filter device including at least one acoustic wave resonator, the acoustic wave resonator includes a piezoelectric film having a piezoelectric property and an interdigital transducer electrode that is positioned on an upper surface of the piezoelectric film and that includes a plurality of electrode fingers. When a value double a pitch of the plurality of electrode fingers is defined as λ and a duty of the plurality of electrode fingers is defined as d, a thickness T of the piezoelectric film satisfies formula (1) below. The filter device has a second attenuation pole by using sub-resonance of the acoustic wave resonator on a high-frequency side of a passband of the filter device. 0.154λd≤T≤0.264λd(1), where λd satisfies formula (2) below: λd=λ/(−0.6111×d2−0.1792×d+1.2449) (2).
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