Two-capacitor-based filter design method and two-capacitor-based filter
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United States of America Patent
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Apr 17, 2018
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app pub date -
Mar 22, 2017
filing date -
Mar 22, 2017
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Abstract
Disclosed is a two-capacitor-based filter design method comprising: determining a frequency f1 and a fractional bandwidth ratio FBW; selecting a first and a second capacitors according to f1 and FBW, in which a resonant frequency fC1 of the first capacitor is equal to f1×(1−N×FBW), a resonant frequency fC2 of the second capacitor is equal to f1×(1+M×FBW), and each of N and M is a positive number less than one; and determining a length of a first transmission line according to fC1 and a signal speed, and determining a length of a second transmission line according to fC2 and the signal speed. The first capacitor is coupled between a center of the first transmission line and ground, the second capacitor is coupled between a center of the second transmission line and ground, and the first and second transmission lines are connected in series.
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