Notch filter using helical transmission line and coaxial...

Details Notch filter using helical transmission line and coaxial... Notch filter using helical transmission line and coaxial...

H - Electricity

01

P

334/20, 336/21,

H01P 1/20 (2006.01) H03H 7/01 (2006.01)

Patent

CA 2013983

ABSTRACT OF THE DISCLOSURE A notch filter comprises a helical transmission line enclosed in a conductive cavity, and a high Q capacitor coupled to form a series-resonant circuit. The capacitor is fabricated from a portion of coaxial cable having an outer conductor forming a first plate of the capacitor and an inner conductor forming the second plate of the capacitor. The notch filter is particularly suited for rejecting terrestrial interference in a C-band tuner at an intermediate frequency of about 400 MHz.

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