Circuit Modeling of Wireless Power Transfer System in the Vicinity of Perfectly Conducting Scatterer

Nozomi HAGA  Jerdvisanop CHAKAROTHAI  Keisuke KONNO  

Publication
IEICE TRANSACTIONS on Communications   Vol.E103-B   No.12   pp.1411-1420
Publication Date: 2020/12/01
Publicized: 2020/06/22
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2019EBP3211
Type of Manuscript: PAPER
Category: Antennas and Propagation
Keyword: 
wireless power transfer,  method of moments,  impedance expansion method,  

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Summary: 
The impedance expansion method (IEM) is a circuit-modeling technique for electrically small devices based on the method of moments. In a previous study, a circuit model of a wireless power transfer (WPT) system was developed by utilizing the IEM and eigenmode analysis. However, this technique assumes that all the coupling elements (e.g., feeding loops and resonant coils) are in the absence of neighboring scatters (e.g., bodies of vehicles). This study extends the theory of the IEM to obtain the circuit model of a WPT system in the vicinity of a perfectly conducting scatterer (PCS). The numerical results show that the proposed method can be applied to the frequencies at which the dimension of the PCS is less than approximately a quarter wavelength. In addition, the yielded circuit model is found to be valid at the operating frequency band.