FILTER USING TRANSVERSELY-EXCITED FILM BULK ACOUSTIC RESONATORS WITH DIVIDED FREQUENCY-SETTING DIELECTRIC LAYERS

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United States of America

APP PUB NO 20250023539A1
SERIAL NO

18900008

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Abstract

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An acoustic filter is provide that includes a substrate; a piezoelectric plate attached to the substrate; and a plurality of bulk acoustic resonators including one or more shunt resonators and one or more series resonators. One or more of the shunt resonators includes an interdigital transducer having interdigital fingers on the piezoelectric plate; a front-side frequency setting layer at least partially on a front side of the at least one shunt resonator; and a back-side frequency setting layer on a back side of the at least one shunt resonator. Moreover, a thickness of the back-side frequency setting layer is at least 30% of a total thickness of the front-side frequency setting layer and the back-side frequency setting layer.

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Patent Owner(s)

Patent OwnerAddress
MURATA MANUFACTURING CONAGAOKAKYO-SHI 26-10 TENJIN 2-CHOME KYOTO-FU 617-8555

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
YANTCHEV, Ventsislav Sofia, BG 138 3509

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