Design of Near-Field Focused Metasurface for High-Efficient Wireless Power Transfer With Multifocus Characteristics

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Abstract
This paper presents a new design of near-field focused metasurface for high-efficiency wireless power transfer with multi-focus characteristics. A general synthesis procedure is outlined to design metasurfaces with desired multiple foci in the near-field zone. The unit cell of printed tri-dipole is used to realize the focused metasurface which has a large range of phase shift and is adapted to near-field focusing applications. Different feeding and focusing designs of the printed tri-dipole metasurfaces are proposed and analyzed. Two kinds of metasurfaces with 20-20 elements are designed, fabricated and measured at 5.8 GHz. One is the single-feed and single-focus case, and the other is single-feed and two-focus case. Two-dimensional planar near-field scanning technique is implemented to measure the E-field focusing characteristics. Full-wave simulations and experiments demonstrate that the proposed focusing metasurfaces have a high wireless power transfer efficiency of 70%. The relative bandwidth with 50% power focusing efficiency is about 16%. The measured results are in good agreement with the theoretical designs and simulated results, which verify the feasibility and correctness of the proposed approach in this paper.
Funding Information
  • National Key R&D Program of China
  • National Natural Science Foundation of China (51477126)
  • Technology Explorer and Innovation Research Project

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