Array Factor, Retrodirective, and E-MIMO Beamforming Technologies

E-MIMO is a method developed by our laboratory to calculate the maximum efficiency of MIMO systems [1], and it has already been reported that the optimal excitation voltage of the transmission elements obtained from the method applies to beamforming [2][3]. In this paper, for a three-element dipole antenna array, we compare the excitation voltages and radiation patterns obtained by the array factor(AF) method, the retrodirective control method, and E-MIMO method, respectively, and clarify the differences between them. All analysis uses the electromagnetic field analysis software Feko.