Sidelobe-Reduction and Interference-Suppression Techniques for Phased Arrays Using Digital Phase Shifters
SYRACUSE UNIV NY DEPT OF ELECTRICAL ENGINEERING
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Through the introduction of a new parameter the radiation pattern of a phased array using digital phase shifters for beam steering can be made periodic and pattern considerations can be confined to a very narrow range of the scan angle. Arrays designed on the basis of a least mean-squared pattern error are shown to require the smallest absolute values of a phase-index function. A systematic and easy-to-apply method is developed for reducing the peak sidelobes of nonreciprocal phased arrays by one-step phase adjustments in certain elements. The amount of possible sidelobe reduction depends on the scan angle and the size of phase-quantization steps. Typical examples for 4-bit phase shifters show that reductions in excess of 9 dB are possible for certain main- beam directions. By the appropriate choice of a weighting function, the same technique can be readily used to suppress noise or interference coming from any given direction.
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