Simplified Feedback Scheme of Beamforming Weights for Wireless Power Transfer Based on Phased Array Antenna

Abstract

Phased array antenna has the capability of controlling the phase of individual antennas and thus widely used in wireless power transfer to direct and focus the beam towards the target steering angle. In order to perform beamforming in a wireless power transfer system, the transmitter needs to send pilot signals so that the receiver can estimate the channel to determine optimal beamforming weights. The beamforming weights are then fedback to the transmitter to be applied to the phased array antenna. The amount of feedback generally increases with the number of elements in the phased array. In this paper, we propose a scheme to reduce the amount of feedback based on far-field approximation in line-of-sight (LOS) environment. We analyze the effect of simplified feedback on the beam pattern in the case of uniformly distributed linear array antenna and planar array antenna. © 2018 IEEE.