Optimised array antenna nulling with phase-only control

Author

Castella, F.R. ; Kuttler, J.R.

Author_Institution

Appl. Phys. Lab., Johns Hopkins Univ., Laurel, MD, USA

Volume

138

Issue

3

fYear

1991

fDate

6/1/1991 12:00:00 AM

Firstpage

241

Lastpage

246

Abstract

The pointing direction gain of a linear phased array antenna is maximised with the constraints of phase-only control at the N antenna elements and the imposition of J nulls at angles θ₁, θ₂. . ., θ_J from the array normal. The specification of J nulling angles requires the a priori knowledge of the directions of the emitter sources. This maximisation problem with constraints is reduced to 2J +2 nonlinear equations which can be solved via a vector Newton algorithm to yield the N complex antenna weights in terms of the 2J+2 unknowns. Examples are given for a 20 element array with uniform and Hamming amplitude weighting and the imposition of as many as five nulling angles. Examples of mainbeam nulling are also given

Keywords

antenna phased arrays; antenna radiation patterns; antenna theory; optimisation; phase control; Hamming amplitude weighting; antenna elements; array antenna nulling; complex antenna weights; emitter sources; linear phased array antenna; mainbeam nulling; maximisation problem; nonlinear equations; nulling angles; phase-only control; pointing direction gain; uniform amplitude weighting; vector Newton algorithm;

fLanguage

English

Journal_Title

Radar and Signal Processing, IEE Proceedings F

Publisher

iet

ISSN

0956-375X

Type

jour

Filename

87793