Null steering methods usually involve costly and complicated amplitude and/or phase control systems. A technique is presented for null steering based on the element position perturbations. The technique frees the phase shifters to be used solely for steering the main beam toward the direction of the desired signal. It also removes the limitations of the other techniques by independently steering the main beam and the nulls to arbitrary independent directions. This technique is also capable of obtaining sidelobe cancellation and wideband signal rejection
htdesing term: Antenna arrays. Antenna phased arrays. Genetic algorithms. t geneti-algorithm has been used for null steering in phased and :,daptive arrays. It has been shown that it is possible to steer the tray null s precisely to the required interference directions and to chieve ny prescribed null depths. A comparison with the results brained from the analytic anlution shows the advatages of using he genetic algorithm for null steering in linear array patterns.
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