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International Journal of Antennas and Propagation
Volume 2016, Article ID 8247476, 8 pages
Research Article

Design of Asymmetrical Relay Resonators for Maximum Efficiency of Wireless Power Transfer

Department of Electronic Information and Communication Engineering, Hongik University, Seoul 121-791, Republic of Korea

Received 28 December 2015; Revised 15 March 2016; Accepted 29 March 2016

Academic Editor: Francisco Falcone

Copyright © 2016 Bo-Hee Choi and Jeong-Hae Lee. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper presents a new design method of asymmetrical relay resonators for maximum wireless power transfer. A new design method for relay resonators is demanded because maximum power transfer efficiency (PTE) is not obtained at the resonant frequency of unit resonator. The maximum PTE for relay resonators is obtained at the different resonances of unit resonator. The optimum design of asymmetrical relay is conducted by both the optimum placement and the optimum capacitance of resonators. The optimum placement is found by scanning the positions of the relays and optimum capacitance can be found by using genetic algorithm (GA). The PTEs are enhanced when capacitance is optimally designed by GA according to the position of relays, respectively, and then maximum efficiency is obtained at the optimum placement of relays. The capacitance of the second resonator to th resonator and the load resistance should be determined for maximum efficiency while the capacitance of the first resonator and the source resistance are obtained for the impedance matching. The simulated and measured results are in good agreement.