Acoustic wave resonator, filter, and multiplexer
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United States of America Patent
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Jan 31, 2023
Grant Date -
Oct 11, 2018
app pub date -
Mar 15, 2018
filing date -
Apr 7, 2017
priority date (Note) -
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Abstract
An acoustic wave resonator includes: a piezoelectric substrate; and an interdigital transducer (IDT) located on the piezoelectric substrate, the IDT including a pair of comb-shaped electrodes having a plurality of electrode fingers and a bus bar to which the plurality of electrode fingers are coupled, the IDT having: a first region in which a pitch of electrode fingers is substantially constant; a second region in which a pitch of electrode fingers decreases at closer distances to an outer side; and a third region in which a pitch of electrode fingers increases at closer distances to an outer side, the second region being located outside the first region in an arrangement direction of the plurality of electrode fingers, and the third region being located outside the second region in the arrangement direction.
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