Firefly Algorithm for Failure Correction of Linear Array of Dipole Antennas in Presence of Ground Plane with Mutual Coupling Effects

摘要

In this paper, firefly algorithm is utilized for the correction of radiation pattern of a linear antenna array of parallel half-wavelength dipole antennas spaced uniformly when defected completely with more than one dipole element. Mutual coupling between the antennas along has been considered along with the effect of distance between the antenna array and the ground plane on the radiation pattern. Adjustments are done in the values of the excitation voltage of the remaining non-defective elements through evolutionary algorithm such that the parameters, namely, side lobe level and maximum reflection coefficient (S-11) in dB of the corrected pattern are calculated and efforts are taken to make it closer to the original pattern values. This certainly avoids replacing of defective elements. The element pattern of individual elements in the array has been assumed omnidirectional in the plane considered. Examples are shown to produce the response of the proposed approach using evolutionary algorithm for three element failures out of twenty elements in the array with the effect on various distances between the antenna array and ground plane. Even though, the method is utilized here for a linear dipole antenna array, it can be applied for other antenna array configurations also.