Synthesis of phased array antenna for side lobe level reduction using the differential evolution algorithm

Abstract

In this paper, we synthesis an array consisting of uniformly excited unequally spaced elements for reducing SLLs. A globally optimal solution for the array elements phase and position is determined by using a differential evolutionary algorithm for a given radiation pattern. Reduced side-lobe levels are observed with position-phase synthesis. The obtained results are compared with the possible two cases i.e., uniform amplitude equal phase (variable position-control) and uniform amplitude unequal phase (variable phase-control). The obtained results justify that the position-phase synthesis technique is not only reduces the side-lobe levels to (− 25.28) dB, but also preserves the advantages of both variable position-controlled synthesis and variable phase-controlled synthesis with a minimum number of array elements.