Introducing deeper nulls and reduction of Side Lobe Levels in a symmetric linear antenna array using genetic algorithm

A design problem of uniform linear antenna arrays for imposing deeper nulls in the desired direction with the constraint of a reduced Side Lobe Level (SLL) and fixed First Null Beam Width (BWFN) is dealt with. This problem is modelled as a simple optimization problem. The method of Real-coded Genetic Algorithm (RGA) is used to determine an optimum set of current excitation weights of antenna elements and optimum inter-element spacing that satisfy the optimization goal. Three design examples are presented that illustrate the use of the RGA, and the optimization goal in each example is easily achieved. Numerical results show the effectiveness of the proposed method.