Bandpass filter for a CATV converter

Details Bandpass filter for a CATV converter Bandpass filter for a CATV converter

1988-06-08

1989-07-18

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333175, 455191, 455195, H03H 712

Patent

active

048497215

ABSTRACT:
A bandpass filter for a CATV converter is of the structure with a low-pass filter section with low-pass filters connected longitudinally in a plurality of stages and a high-pass filter section, and comprises a variable trap circuit including a varactor and an inductor, and another varactor connected to one of the capacitors belonging to the low-pass filter section. Capacitances of these varactors are controlled by a tuning voltage so as to eliminate the various problems which would occur in a double-balance mixer to be connected at a later stage in the CATV converter.

REFERENCES:
patent: 4247953 (1981-01-01), Shinagawa et al.
patent: 4291290 (1981-09-01), Ijichi et al.
patent: 4408348 (1983-10-01), Theriault
patent: 4442548 (1984-04-01), Lehmann
patent: 4584544 (1986-04-01), Hettiger
patent: 4612571 (1986-09-01), Moon

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