A Fast-Speed Phase Adaptation Algorithm Based on Power Feedback for Microwave Power Transmission

Abstract

The microwave power transmission system (MPT) is one of the most promising technologies in the long-range wireless power transfer field. However, the transmission efficiency limits the performance of MPT, which can be improved by adapting the phase of each transmitting antenna to increase the amount of constructive interference at the receiver. It is challenging to achieve the stability and fast convergence of the phase algorithm due to a large number of the transmitting antennas. In this paper, a rapid phase adaptation algorithm based on the golden section and bisection method (GSS_BI) is proposed. In the proposed method, the mathematical model between the phase of the transmitters and the power of the receiver is established, which plays a significant role in designing the phase adaptation algorithm. Then the GSS_BI algorithm reduces the searching range based on the mathematical model and employs the bisection method to find the optimal phases. The simulation is shown to validate the proposed GSS_BI algorithm. It is found that the proposed method can reduce 89% of the number of iterations that is used by the conventional method when the number of transmitting antennas is 46.