Dissertation Defense: Explicit Impedance Matching Network and Coil Designs for Megahertz Wireless Power Transfer

Date: 2023/05/24 - 2023/05/24

Dissertation Title: Explicit Impedance Matching Network and Coil Designs for Megahertz Wireless Power Transfer

Speaker: Yaoxia Shao, Ph.D. candidate at UM-SJTU Joint Institute

Time: May 24th from 10:00 a.m., 2023 (Beijing Time)

Location: Room 403, Longbin Building


Existing impedance matching network (IMN) design methods for megahertz (MHz) wireless power transfer (WPT) systems are usually trial-and-error-based or directly using tunable IMNs. This dissertation uses simple and passive IMNs, deriving a new explicit design methodology to calculate their parameters quickly and accurately. This methodology effectively improves the loading condition of the power amplifier (PA) and thus enhances the robustness of the overall system under varying operation conditions. Meanwhile, an explicit design of a double-sided IMN with increased degrees of design freedom (DOFs) is developed to compensate for simultaneous variations in multiple operation conditions. Furthermore, novel coil structures (quasi-elliptic coil, belt coil and coil with “decoupling ring”) targeting two representative MHz WPT applications (drone charging and dual-band operation) are designed to improve the compactness, spatial freedom and coil efficiency of the corresponding systems. The explicitly-designed IMN and the novel coils demonstrate their functionality and practicality in different experimental prototypes and application examples.


Yaoxia Shao received the B.S. (Hons.) degree in mechanical design, manufacturing, and automation from Tongji University, Shanghai, China, in 2018. He is currently a Ph.D. candidate at the UM-SJTU Joint Institute, supervised by Prof. Chengbin Ma. His research interests include high-frequency power conversion circuits and applications in both inductive power transfer and microwave power transfer.