Differential Evolution Algorithm for Synthesis of Collinear Dipole Array of Optimized Length with Minimum Standing Wave Ratio and Fixed Side Lobe Level

In this article, Differential Evolution (DE) algorithm has been used to design a non-uniformly spaced collinear dipole array of uniformly optimized length. The goal is to generate a pencil beam in the horizontal plane with minimum Standing Wave Ratio (SWR) and fixed Side Lobe Level (SLL). Dynamic Range Ratio (DRR) of current amplitude distribution is kept at a fixed value. A simultaneous optimization of excitation distribution and geometry of individual array elements is carried out to improve radiation characteristics. Coupling effect between the array elements is analyzed using induced EMF method and minimized in terms of SWR. DRR is fixed at a lower value in order to compensate mutual coupling between individual radiators. Phase distribution for all the elements is kept at zero degree. Numerical results show the effectiveness of the algorithm for the design of the proposed array.