Wavelet Mutation Based Novel PSO for Optimal Design of Concentric Circular Array Antennas

In this paper, optimal designs of three-ring concentric circular array antennas (CCAA) without and with central element feeding are reported. For each design set, optimal current excitations and radii are determined with the objective of maximum Sidelobe Level (SLL) reduction. The optimization technique adopted is Novel Particle Swarm Optimization (NPSO). To enhance the optimization performance of NPSO further in exploring the solution space more effectively for a better solution, the wavelet theory is again applied in terms of mutation. This wavelet mutation based NPSO is named as NPSOWM. The extensive computational results show that the CCAA having central element feeding yield much more reductions in SLL as compared to the same not having central element feeding. Moreover, the particular CCAA containing 4, 6 and 8 number of elements in three successive rings along with central element feeding yields grand minimum SLL (-43.48 dB) as determined by NPSOWM. Conventional Particle Swarm Optimization (PSO), its Wavelet Mutation based improved version (PSOWM) and NPSO as well are adopted to compare the results of the above technique, NPSOWM. The NPSOWM consistently shows the best solution quality. Keywords-Concentric Circular Array Antennas (CCAA); Non-uniform Excitation; Sidelobe Level (SLL); Particle Swarm Optimization (PSO); Wavelet Mutation (WM)