Circuit and method for reducing polarization crosstalk caused by

Details Circuit and method for reducing polarization crosstalk caused by Circuit and method for reducing polarization crosstalk caused by

1978-03-03

1982-01-26

Safourek, Benedict V.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455305, 455 60, 343100PE, 370 6, H04B 710

Patent

active

043132200

ABSTRACT:
A circuit for reducing the effects of polarization crosstalk occurring on a first RF signal due to a second RF signal, wherein the first and the second RF signals are two approximately orthogonally polarized RF signals having essentially the same frequency. The circuit comprises a first antenna and a first signal path (including RF and IF sections) for the first RF signal and a second antenna and a second signal path (including RF and IF sections) for the second RF signals. A first coupler diverts a portion of the signal on the second signal path into a first network comprising the series combination of a variable attenuator and a variable phase shifter. A summing circuit sums both the signal on the first signal path and the signal output from the first network with the result that the undesired signal on the first signal path is reduced. A logic circuit, responsive to the magnitude of one of the RF signals, controls the first network according to a predetermined relationship.

REFERENCES:
patent: 3430156 (1969-02-01), Katzin
patent: 3883872 (1975-05-01), Fletcher
patent: 4027105 (1977-05-01), Kannowade
patent: 4090137 (1978-05-01), Soma et al.
Comsat Review vol. 6, No. 2, Fall 1966, pp. 253-283, "Adaptive Polarization Control for Satellite Frequency Reuse Systems".
Bell System Technical Journal, vol. 53, No. 8, Oct. 1974, "Rain-Induced Cross-Polarization at Centimeter and Millimeter Wavelengths", by T. S. Chu.
Spectrum Reuse by Adaptive Polarization Separation, B. D. Cullen et al.; Harris Corp., P.O. Box 37; Melbourne, Fla., 32901, 1975, Telecommunications Conference.

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