VARIABLE BAND PASS FILTER DEVICE
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United States of America Patent
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app pub date -
Dec 18, 2013
filing date -
Jul 7, 2011
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Abstract
A variable filter device has: a first series arm which is serially connected to a signal line, includes a variable capacitance and an inductance, and constitutes a series resonator; first and second parallel arms, which are connected between the signal line and the ground on both sides of the first series arm, each of which includes a variable capacitance and an inductance, and constitutes a grounded series resonator. The first series arm defines the center frequency of the pass band, and the first and second parallel arms define attenuation poles sandwiching the pass band.
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