Analysis of a Wireless Power Transfer System by the Impedance Expansion Method Using Fourier Basis Functions

Nozomi HAGA  Masaharu TAKAHASHI  

IEICE TRANSACTIONS on Communications   Vol.E101-B   No.7   pp.1708-1715
Publication Date: 2018/07/01
Publicized: 2018/01/18
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2017EBP3316
Type of Manuscript: PAPER
Category: Antennas and Propagation
wireless power transfer,  method of moments,  impedance expansion method,  Fourier basis functions,  

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The impedance expansion method (IEM), which has been previously proposed by the authors, is a circuit-modeling technique for electrically-very-small devices. This paper provides a new idea on the principle of undesired radiation in wireless power transfer systems by employing IEM. In particular, it is shown that the undesired radiation is due to equivalent infinitesimal dipoles and loops of the currents on the coils.