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Null steering methods usually involve costly and complicated amplitude and/or phase control systems. A new technique is presented for null steering based on the element positions perturbations. This method possesses an even symmetry pattern cancellation, which allows nulls to be imposed at symmetrical positions around the main beam. Also it frees the phase shifters to be used solely for steering the...
In this work, a linear phased array pattern design with null steering is achieved using the array polynomial technique and the Particle Swarm Optimization (PSO) algorithm. The null steering for interference suppression is obtained by controlling some of the roots on the Schelkunoff’s unit circle while keeping the roots responsible for the main beam unchanged. The rest of the roots are controlled to...
A new synthesis technique for the linear phased array is developed based on using the array polynomial technique. The array factor is expressed as the product of subpolynomials such that their roots are located on the unit circle. All array elements are active for any arbitrary non-prime number of the array elements. Null steering for interference suppression is obtained by using one subploynomial...
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