Abstract
SummaryOptimization for the reduction of power losses in sidebands and side lobes of time‐modulated antenna array (TMLAA) is dealt in this work. Optimization for the reduction of power in TMLAA is analyzed by considering two ways of the power loss analysis: one with the minimization of power loss with optimization of Toff instant with Ton instant as zero for each element along with optimal inter‐element spacing with uniform amplitude and second, by taking optimization of Ton and Toff instant of each element of TMLAA along with optimal inter‐element spacing with uniform amplitude. Distance between any two consecutive antennas and switch ON and OFF instants are considered as optimizing variables for reduction of power due to sidebands at harmonic frequencies and side lobes at the fundamental harmonic. Towards this approach, an evolutionary algorithm‐based approach called harmony search algorithm (HSA) is applied. Optimal values of the variable parameters of the TMLAA are obtained after optimization by using particle swarm optimization (PSO) and HSA. MATLAB simulation results are presented in this work for different array sets of 16‐, 20‐, 24‐, 28‐, and 32‐element antenna arrays. To validate in electromagnetic (EM)‐simulated environment, a 16‐element TMLAA is designed in CST‐MWS with parameters obtained after optimization, and these results are validated with those of MATLAB results.
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