| Analysis of Efficiencies for Multiple-Input Multiple-Output Wireless Power Transfer Systems |
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Sejin Kim, Bomson Lee |
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Department of Electronic and Radio Engineering, Kyung Hee University |
Correspondence:
Bomson Lee,Email: bomson@khu.ac.kr
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| Abstract |
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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. |
| Key words:
Coupling Coefficient, Optimum Load Resistance, Transfer Efficiency, Wireless Power Transfer, Z Matrix |
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