Multiple interference null tracking array antenna

Details Multiple interference null tracking array antenna Multiple interference null tracking array antenna

1983-03-30

1985-02-05

Lieberman, Eli

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343383, G01S 316, G01S 328

Patent

active

044980833

ABSTRACT:
Multiple interference sources are independently acquired, tracked and canled in a multi-element antenna array where the number of antenna elements n is an integer power of the base 2, i.e. n=2.sup.M where M is the number of sources desired to be cancelled. The antenna elements are selectively coupled to sets of n/2 phase shifters in respective closed loop control circuits and operate in phase controlled sets, one for each interference source. The phase of the received signal incident on one half of the elements in each set is independently adjusted relative to the other half, for each desired null in a separate control loop, such that for a particular interfering source each antenna element of the set has one corresponding neighboring element in a pair of elements whose phase mutually differs by 180.degree. at the space angle of the arrival of the interference wavefront relative to the axis of the antenna. This produces a substantially infinite null in the direction of arrival of the particular interfering wavefront and thus complete cancellation of that interfering source is effected. This null is retained as other interfering sources are independently acquired, nulled and tracked by a respective different set of n/2 elements in the same array.

REFERENCES:
patent: 3130410 (1964-04-01), Gutleber
patent: 4217586 (1980-08-01), McCuffin

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