Journal of electromagnetic engineering and science

  • 제16권2호
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  • Pages.126-133
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  • 2016
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  • 2671-7255(pISSN)
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  • 2671-7263(eISSN)
한국전자파학회 (The Korean Institute of Electromagnetic Engineering and Science)
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Analysis of Efficiencies for Multiple-Input Multiple-Output Wireless Power Transfer Systems

  • Kim, Sejin (Department of Electronic and Radio Engineering, Kyung Hee University) ;
  • Lee, Bomson (Department of Electronic and Radio Engineering, Kyung Hee University)
  • 투고 : 2016.01.04
  • 심사 : 2016.04.04
  • 발행 : 2016.04.30
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초록

Wireless power transfer (WPT) efficiencies for multiple-input multiple-output (MIMO) systems are formulated with a goal of achieving their maximums using Z matrices. The maximum efficiencies for any arbitrarily given configurations are obtained using optimum loads, which can be determined numerically through adequate optimization procedures in general. For some simpler special cases (single-input single-output, single-input multiple-output, and multiple-input single-output) of the MIMO systems, the efficiencies and optimum loads to maximize them can be obtained using closed-form expressions. These closed-form solutions give us more physical insight into the given WPT problem. These efficiencies are evaluated theoretically based on the presented formulation and also verified with comparisons with circuit- and EM-simulation results. They are shown to lead to a good agreement. This work may be useful for construction of the wireless Internet of Things, especially employed with energy autonomy.

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