Method and apparatus for cancelling interference between area co

Details Method and apparatus for cancelling interference between area co Method and apparatus for cancelling interference between area co

1977-06-03

1979-03-20

Tubbesing, T.H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

325158, 343100ST, 343208, H04B 704

Patent

active

041456580

ABSTRACT:
The present invention relates to method and apparatus for substantially cancelling interference between signals using the same frequency spectrum which are received via overlapping area coverage and spot coverage antenna beams. At the transmitter where the overlapping area and spot coverage beams are concurrently transmitted, a predetermined portion of the area coverage signal is coupled into each of the spot beam signals which will be overlapped at the associated spot beam receiver area by the area coverage beam. The predetermined portion coupled into each spot beam signal will have a magnitude and phase to substantially cancel the area coverage signal at the associated spot beam receiver area.

REFERENCES:
patent: RE27478 (1972-09-01), Battail et al.
patent: 2520184 (1950-08-01), Ullrich
patent: 3094695 (1963-06-01), Jahn
patent: 3369235 (1968-02-01), Odams et al.
patent: 3406401 (1968-10-01), Tillotson
patent: 3541553 (1970-11-01), Gubin
patent: 3673497 (1972-06-01), Thrasher
patent: 3696429 (1972-10-01), Tressa
patent: 3710255 (1973-01-01), Gicca
patent: 3711855 (1973-01-01), Schmidt et al.
patent: 3987444 (1976-10-01), Masak et al.

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