Resonator device and high frequency filter
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United States of America Patent
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Mar 22, 2016
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Sep 26, 2013
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Abstract
A resonant circuit includes a resonator having a resonant frequency and an anti-resonant frequency, an inductor connected in series to the resonator, an inductor connected in parallel to the resonator, and a series circuit in which a variable capacitor is connected in series to an inductor (15). The series circuit is connected in parallel to the resonator. The anti-resonant frequency closest to the resonant frequency of the resonator is moved toward higher frequencies or lower frequencies of the resonant frequency on a frequency axis with a variation in the capacitance value of the variable capacitor. With this configuration, a resonator device and a high-frequency filter are provided, in which the relationship between a transmission frequency band and a reception frequency band on the frequency axis is applicable to a variety of multiple communication bands.
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