Filter device and multiplexer

Provided is a compact filter device capable of filtering a signal over a wide frequency band. A filter device (10) is provided with: a piezoelectric substrate (201); a dielectric layer (202) provided on the piezoelectric substrate (201); an IDT electrode (203) provided on the dielectric layer (202);...

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Bibliographic Details
Main Authors SATO TOMOYA, OKUBO KOTA, KONDO SEIMA, KAMEOKA YOSHINORI, FURUSATO HIROYUKI, OKUDE TAKAYUKI
Format Patent
LanguageChinese
English
Published 20.02.2024
Subjects
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
RESONATORS
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Summary:Provided is a compact filter device capable of filtering a signal over a wide frequency band. A filter device (10) is provided with: a piezoelectric substrate (201); a dielectric layer (202) provided on the piezoelectric substrate (201); an IDT electrode (203) provided on the dielectric layer (202); an IDT electrode (205) provided in a region on the piezoelectric substrate (201) in which the dielectric layer (202) is not provided, the IDT electrode (205) being arranged side by side with the IDT electrode (203) in an elastic wave propagation direction (P) along the main surface of the piezoelectric substrate (201); a reflector (2041) provided on the dielectric layer (202) on the IDT electrode (205) side so as to be adjacent to the IDT electrode (203); and a reflector (2041) provided directly on the piezoelectric substrate (201) adjacent to the IDT electrode (205) on the IDT electrode (203) side, the dielectric layer (202) having an end portion (2021), the end portion (2021) being located between the reflector
Bibliography:Application Number: CN202280045558