NASA NTRS · 19770011363
Notch filter
Abstract
A notch filter for the selective attenuation of a narrow band of frequencies out of a larger band was developed. A helical resonator is connected to an input circuit and an output circuit through discrete and equal capacitors, and a resistor is connected between the input and the output circuits.
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Shelton, G. B.. 1977-02-08. Notch filter. https://ntrs.nasa.gov/citations/19770011363
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