Multi-Target Microwave Power Transmission With Maximum Efficiency and Allocable Power Proportion

Low wireless power transmission efficiency (PTE) and uncontrollable power proportion among multiple receiving targets often lead to the great waste of energy and extremely low received power. Therefore, multi-target microwave power transmission (MPT) with high PTE and allocable power proportion is critical for current MPT systems. In this work, optimal designs for multi-target MPT based on the weighted and constrained method of the maximum power transmission efficiency (WCMMPTE) are proposed to solve these two problems at the same time. Several receiving terminals represented by test antennas surrounded by 40-element transmitting antenna array are modeled to build a multiple-input multiple-output MPT system and the corresponding full-wave simulations are conducted to validate the proposed theory. By optimizing the distribution of excitations for the transmitting array antenna through WCMMPTE, the maximal PTE is guaranteed while the different proportions of power received by terminals are simultaneously achieved.