Control parameter-based comparative study of radiation properties of TMCCAA and TMHSCAA

Two different configurations have been considered for the optimal design of radiated electric field pattern characteristics of antenna arrays. Time-modulated concentric circular antenna array (TMCCAA) and time-modulated half symmetric circular antenna array (TMHSCAA) have been dealt with for the comparative analysis of control parameters of the radiation properties of the antenna array. Collective animal behaviour (CAB), an evolutionary approach, is applied as the optimisation tool. The effect of different control parameters of the radiation pattern of TMCCAA is compared by taking two different cases. In the first case, i.e., Case-1, only one parameter (switching time sequence) is used as the control parameter for the optimisation of the radiated electric field pattern of TMCCAA. In the second case, i.e., for Case-2, three control parameters, switching ON-OFF time of each ring, inter-element spacing, and ring radii are optimised.In the second array, the effect of different control parameters of the radiation pattern of Time-Modulated Half Symmetric Circular Antenna Array (TMHSCAA) is compared by taking two different cases. Simulation results obtained for 20- elements TMHSCAA with uniform amplitude and spacing are analysed. Optimized SLL values obtained for the Case-1 and Case-2 of TMCCAA are -24.68 dB and -46.15 dB, respectively.