Optimization of radiation characteristic of time modulated circular geometry using DEWM

Abstract

In this paper, Differential Evolution with Wavelet Mutation (DEWM) is applied to the radiation pattern synthesis of circular geometries of antenna array. Two circular geometries have been considered: (a) Time-Modulated Half-Symmetric Circular Antenna Array (TMHSCAA); (b) 9-ring Time Modulated Concentric Circular Antenna Array (TMCCAA). DEWM algorithm is applied to show the performance improvement of the optimal designs of TMHSCAA and TMCCAA. While doing so, various other stochastic algorithms, such as Real coded Genetic Algorithm (RGA), Particle Swarm Optimization (PSO), and Differential Evolution (DE), are used for the sake of comparison to establish the superiority of DEWM. For TMHSCAA, elements are symmetrical around the vertical axis; therefore, the number of parameters to be optimized is reduced with two control parameters, such as switching excitation phase of each element. For TMCCAA, two proportional case studies, Case 1 and Case 2, are investigated with different variable parameters. The simulation outcomes show the supremacy of DEWM to be a plausible claimant for scheming the best TMHSCAA and TMCCAA. The simulation tests have also been performed with 20- and 36-element TMHSCAAs and 9-ring TMCCAA.