Adaptive nulling circular array antenna

Details Adaptive nulling circular array antenna Adaptive nulling circular array antenna

1989-06-05

1990-04-10

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a steerable array

342372, H01Q 322, H01Q 324, H01Q 326

Patent

active

049164546

ABSTRACT:
A method of operating a circular array antenna, Butler matrix, phase shifters and beam forming network is described including a control circuit or computer algorithm for modifying the phase of the phase shifters, one at a time, and measuring the output power received or transmitted by the circular array antenna to estimate the gradient of the output power. The invention overcomes the problem of nulling out interfering signals by modifying the beam pattern of the antenna in certain directions while maintaining the beam pattern in preferred directions for receiving desired signals.

REFERENCES:
patent: 4178581 (1979-12-01), Willey, Sr.
patent: 4316192 (1982-02-01), Acoraci
patent: 4425567 (1984-01-01), Tresselt
patent: 4628321 (1986-12-01), Martin
patent: 4825213 (1989-04-01), Smrek
B. Sheleg, "A Matrix-Fed Circular Array for Continuous Scanning", Proc. IEEE, Nov. 1968, pp. 2016-2027.

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