Qiaowei Yuan is a distinguished full professor at the Tohoku Institute of Technology, as well as a specially appointed professor at Tohoku University in Japan. She obtained her PhD degree from Xidian University in China, where she spent two years conducting research at Tohoku University in Japan. Dr. Yuan has extensive experience in antenna engineering, adaptive array antennas, and wireless power transfer (WPT) technology, having worked at Japanese companies and universities. She has co-authored three books on these topics and her work has been recognized with numerous awards, including the Best Paper Award and the Zenichi Kiyasu Award from the Institute of Electronics, Information and Communication Engineers (IEICE) of Japan, as well as several Achievement Awards from IEICE’s Technical Committee on Wireless Power Transfer and Antenna Propagation Committee.
Dr. Yuan has also held various leadership positions, including serving as the secretary of IEICE’s Technical Committee on Wireless Power Transfer, as well as being the vice-chair and chair of IEEE Sendai Women in Engineering (WIE). She is a member of IEEE’s R10 WIE committee, and currently serves as a member of IEEE MTT-C25 and the vice-chair of the Technical Committee on Antennas and Propagation of IEICE.
The talk will present a universal approach for calculating the power transfer efficiency (PTE), maximum power transfer efficiency (MPTE), and conditions for achieving MPTE for arbitrary multiple input (or transmitters) multiple output (or receivers) wireless power transfer (MIMO-WPT) systems. The PTE, also known as the RF efficiency, between M transmitters and N receivers, is precisely formulated using the equivalent M+N port S-parameters circuit network as the Rayleigh quotient. Accordingly, the MPTE is achieved by calculating the eigenvalue of the generalized Rayleigh problem that has been formulated. The effectiveness and universality of the proposed method are demonstrated through highlighting the MPTEs of single transmitter single receiver (SISO) and multiple transmitters single receiver (MISO) among many applications. Several potential applications of the proposed approaches are introduced based on the MPTE performance of the MISO system.