Analysis and experimental validation of the WPT efficiency of the both-sides retrodirective system  

作　　者：Charleston Dale Ambatali Shinichi Nakasuka Bo Yang Naoki Shinohara 

机构地区：[1]Department of Aeronautics and Astronautics,The University of Tokyo,Japan [2]Electrical and Electronics Engineering Institute,University of the Philippines,Philippines [3]Research Institute for Sustainable Humanosphere,Kyoto University,Japan

出　　处：《Space Solar Power and Wireless Transmission》2024年第1期48-60,共13页空间电力与无线传输（英文）

摘　　要：The retrodirective antenna array is considered as a mechanism to enable target tracking of a power receiver for long range wireless power transfer(WPT)due to its simplicity in implementation using only analog circuits.By installing the retrodirective capability on both the generator and rectenna arrays,a feedback loop that produces a high efficiency WPT channel is created.In this paper,we characterize the dynamics of this phenomenon using a discrete-time state-space model based on S-parameters and show that the system can naturally achieve maximum theoretical WPT efficiency.We further confirmed the theoretical analysis through a hardware experiment using a 12-port circuit board with measurable S-parameters mimicking a static wireless channel.The results collected from the hardware experiment show agreement with the proposed theoretical framework by comparing the theoretical efficiency with the measured efficiency and by showing that the collected data points follow the predicted condition to achieve maximum efficiency.

关 键 词：Wireless power transfer Retrodirective antennas S-PARAMETERS 

分 类 号：TM464[电气工程—电器]