Space Matching for Highly Efficient Microwave Wireless Power Transmission Systems: Theory, Prototype, and Experiments

Ping Lu, Kama Huang, Yang Yang, Bing Zhang, Fei Cheng, Chaoyun Song

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Abstract

Microwave wireless power transmission (MWPT) via radio waves has been an important research topic of the WPT systems, where the overall power transfer and conversion efficiency is a key factor to evaluate the system performance. The state-of-the-art work on MWPT has only taken the end-to-end power transfer efficiency in free space or the power conversion efficiency of the receiver (rectenna) into consideration separately when optimizing the power transfer efficiency of the overall system. To comprehensively consider the system-level matching of the entire MWPT system, a novel space matching concept, including aperture field matching, power matching, and impedance matching, is proposed for optimizing the overall power transfer efficiency. By using the space matching method in this work, the optimal designs of the subsystem components such as the transmitting antenna, receiving antenna, and rectifying circuit can be separately obtained to avoid the complex systematic optimization of the large-scale and complicated MWPT system, therefore, significantly improving the overall power transfer efficiency by 19.4% compared with the traditional methods, and reducing the complexity in large-scale system-level design. This work will have valuable implications in the system design of MWPT applications.

Original languageEnglish
Pages (from-to)1985-1998
Number of pages14
JournalIEEE Transactions on Microwave Theory and Techniques
Volume69
Issue number3
Early online date8 Feb 2021
DOIs
Publication statusPublished - 1 Mar 2021

Keywords

  • Microwave circuits
  • Microwave theory and techniques
  • Microwave wireless power transmission (MWPT)
  • power transfer and conversion efficiency (PTCE)
  • Radio frequency
  • Receiving antennas
  • rectenna array
  • Rectennas
  • Rectifying circuits
  • separate optimization
  • space matching concept.
  • Transmitting antennas
  • space matching concept

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Radiation
  • Electrical and Electronic Engineering

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