Notch filter using helical transmission line and coaxial capacit

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

1989-07-10

1991-07-16

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333175, 333219, 333202, H03H 712, H01P 120

Patent

active

050328077

ABSTRACT:
A notch filter comprises a helical transmission line enclosed in a conductive activity, 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.

REFERENCES:
patent: 3007121 (1961-10-01), Schlicke
patent: 3121205 (1964-02-01), Foss
patent: 3683244 (1972-08-01), Kitamura et al.
patent: 3820045 (1974-06-01), Igarashi
patent: 3936776 (1976-02-01), Sundquist
patent: 4052684 (1977-10-01), Schmalz
patent: 4182997 (1980-01-01), Brambilla
patent: 4186359 (1980-01-01), Kaegebein
patent: 4490699 (1984-12-01), Yanagida
patent: 4682131 (1987-07-01), May
patent: 4801904 (1989-01-01), Sakamoto et al.

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