Side-lobe reduction of a symmetric broadside array by spacing perturbation

Side-lobe reduction of a symmetric broadside array by tuning-element spacings is presented. Through appropriate point matching and least-square error approximation of the radiation power distribution, further side-lobe reduction may be achieved without broadening the beamwidth. Three simulation results will be given to show the applicability of the proposed spacing perturbation technique in reducing side-lobe levels.