Synthesis of Far Field Radiation Pattern of a Concentric Hexagonal Array Antenna Using Different Objective Functions

In this study, a concentric hexagonal antenna array (CHAA) is designed, and the far field radiation pattern is optimized using a meta-heuristic optimization algorithm namely Teaching Learning Based Optimization (TLBO) algorithm. For this CHAA structure, two objective functions are considered. The first objective is to reduce Side Lobe Level (SLL) only when First Null Beam Width (FNBW) is lesser than desired First Null Beam Width (FNBWD) value. The second objective function is to minimize the SLL to a desired level without keeping any FNBW constraints. The performance of the same algorithm for two different objective functions has been compared based on SLL values, computational time, and statistical data. After comparing is observed that the optimization result using the second objective function provides lower SLL in expense of higher FNBW and greater computational time.