Cavity Resonator Wireless Power Transfer in an Enclosed Space with Scatterers Utilizing Metal Mesh

Ippei TAKANO  Daigo FURUSU  Yosuke WATANABE  Masaya TAMURA  

IEICE TRANSACTIONS on Electronics   Vol.E100-C    No.10    pp.841-849
Publication Date: 2017/10/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E100.C.841
Type of Manuscript: Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
wireless power transfer,  cavity resonator,  wireless harness,  enclosed space,  NLOS,  frequency selective surface,  

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In this paper, we applied cavity resonator wireless power transfer (CR WPT) to an enclosed space with scatterers and revealed that high transfer efficiency at line-of-sight (LOS) and non-line-of-sight (NLOS) position in the power transmitter can be achieved by this method. In addition, we propose a method for limiting the wireless power transfer space utilizing metal mesh and show its effectiveness by experiment. First, we confirm that the constructed experimental model is working as a cavity resonator by theoretical formula and electromagnetic field analysis. Next, we calculate the maximum power transfer efficiency using a model including a plurality of scatterers by installing a power receiver at LOS and NLOS positions in the power transmitter, and it was confirmed that transfer efficiency of 30% or more could be expected even at the NLOS position. Then, we measured the frequency characteristics of a model in which one surface of the outer wall was replaced with a metal mesh, and it was clarified that the characteristics hardly changed in the power transfer frequency band. Finally, we confirmed that simultaneous communication can be performed with driving of the battery-less sensor by CR WPT, and clarify effectiveness of the proposed method.