Differential evolution algorithm for synthesis of collinear dipole array of arbitrary length with minimum Standing Wave Ratio and fixed Side Lobe Level

This paper investigates the application of recently proposed Differential Evolution (DE) algorithm for evolutionary optimization of non-uniformly spaced collinear dipole array of any length. The array is computed to generate a pencil beam in the horizontal plane with minimum Standing Wave Ratio (SWR) and a desired 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 elements is analyzed using induced EMF method and minimized in terms of SWR. DRR of excitation distribution is fixed at an optimum value to obtain impedance matching condition. Phase distribution for all the elements is kept at zero degree. Numerical results show the effectiveness of DE for the design of the array.