The authors present a technique that is capable of steering nulls in the antenna pattern in the directions of strong interference signals. The technique is based on dividing a large array into two contiguous subarrays symmetrical about the array center. The element positions of one of the subarrays are used to form the nulls in the antenna pattern. This technique frees the phase shifters to be used solely for steering the main beam. It also freezes the positions of the elements in the other subarray.
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Hejres et al. (2007) studied this question.
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