Variable-frequency filter

A variable-frequency filter includes a series-arm resonant circuit and a parallel-arm resonant circuit. Each of the series-arm resonant circuit and the parallel-arm resonant circuit includes a piezoelectric resonator, an inductor, and a variable capacitor. A pass band of the variable-frequency filte...

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Bibliographic Details
Main Author Tani, Masakazu
Format Patent
LanguageEnglish
Published 01.01.2019
Subjects
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
RESONATORS
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Summary:A variable-frequency filter includes a series-arm resonant circuit and a parallel-arm resonant circuit. Each of the series-arm resonant circuit and the parallel-arm resonant circuit includes a piezoelectric resonator, an inductor, and a variable capacitor. A pass band of the variable-frequency filter is formed by a resonant point of the series-arm resonant circuit and a sub-anti-resonant point of the parallel-arm resonant circuit. An attenuation pole at a higher frequency than a pass band is formed by an anti-resonant point of the series-arm resonant circuit and a resonant point of the parallel-arm resonant circuit.
Bibliography:Application Number: US201615178113