Abstract
ABSTRACT In this paper, a method relying on Symbiotic Organisms Search optimisation algorithm is proposed for the design of a reconfigurable concentric circular array with phase-only controls differentiating the beams. The objective is to produce a pencil/flat top beam pair with uniform amplitude excitations for all the elements. Both beams share the same number of elements in the rings. The flat top beam uses the generated phases and the pencil beam uses zero phases for the elements. Hence, this method deals with finding the number of elements in each ring and radial phases of the elements in delivering the expected parameters related to the beams generated. These numbers of elements and radial phases are generated with the help of Symbiotic Organisms Search optimisation algorithm. The performance characteristic of this method is studied using the constraint of the first null beam width. Results obtained show the superiority of this algorithm over other meta-heuristic optimisation algorithms like Differential Evolution, Biogeography-based optimisation and imperialist competitive algorithms of the past.
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