Constant Z bandswitched input filter

Details Constant Z bandswitched input filter Constant Z bandswitched input filter

1984-12-07

1986-09-16

George, Keith E.

Facsimile and static presentation processing

Static presentation processing

Attribute control

333174, 333 32, 455191, H04N 710, H03H 710

Patent

active

046125710

ABSTRACT:
A constant impedance (Z) bandswitched input filter for use in a wideband signal receiver includes a low pass filter, a high pass filter and a bandpass filter for reducing intermodulation distortion as well as for providing a flat input impedance characteristic. The bandpass filter resonates at the crossover frequency between the low and high pass filters for minimizing insertion loss while maintaining a constant termination impedance across the entire input signal bandwidth to reduce the input standing wave ratio (VSWR). Switching means are provided for coupling the high and low pass filters as well as the bandpass filter in circuit depending upon the frequency band tuned to. The constant Z bandswitched input filter is particularly adapted for use in a wide band cable television (CATV) system for substantially reducing intermodulation distortion and signal reflections arising from impedance mismatches, but has application in any cable operated multichannel communications system.

REFERENCES:
patent: 3336539 (1967-08-01), Kwartiroff et al.
patent: 4247953 (1981-01-01), Shinagawa et al.
patent: 4542300 (1985-09-01), Nagatomi
patent: 4571560 (1986-02-01), Dobrovolny

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