Behavioral Modeling of Multi-channel Array Transmitter in Microwave Power Transfer

This paper proposes a behavioral modeling of multi-channel transmitter in microwave power transfer (MPT). An energy beam forming (EBF) is a key technology to solve the low energy transmission efficiency problem of MPT system. To use the EBF, the channel characteristics between receiver and array transmitter should be estimated. Unlike communication systems that use RF power amplifier (PA)s in the linear input range, to increase the transmission efficiency of the MPT system, it is necessary to utilize the maximum output range of the PA. We propose a method for performing nonlinear modeling of each transmitter channel using received signals by periodically changing the weight of the transmitter channels using the attenuator control on each channel. Polynomial model coefficients are extracted by Pseudo-inverse using the signals of each channel and the signal of the receiver. In MPTs with multiple transmitters, the proposed method can model characteristics of each transmitter channel efficiently. To validate the proposed method, we perform the proposed modeling for a 5.8GHz 16-channel phase array MPT system.