Department of Electronics and Computer Engineering, Hanyang University, Seoul, South Korea. Moasoft Co., Ltd., Seoul, South Korea. Department of Electronic engineering, Kookmin University, Seoul, South Korea. Department of Telecommunication, Soongsil University, Seoul, South Korea. School of Electronic and Electrical Engineering, Hongik University, Seoul, South Korea.
We propose a novel resonator that can reduce magnetic field leakage using a ferrite plate. The proposed resonator consists of a rectangular loop, a ferrite plate, and an L-matching network. The ferrite plate is used as an H-field reflector to direct more H-field to each resonator, and the L-matching network is employed to match the 50 Ω of the feed cable at 13.56 MHz. Two identical resonators with dimensions of 30 cm × 15 cm are separated by 50 cm, and the resulting transmission efficiency is about ?12.3 dB at 13.56 MHz. This is about 4.2 dB higher than the resonators without the ferrite plate.
G. Byun, S. Ji, B. Jang, C. Seo and H. Choo, "Design of a Loop Resonator with Improved Power Transmission Efficiency Using a Ferrite Plate," Journal of Electromagnetic Analysis and Applications, Vol. 5 No. 5, 2013, pp. 196-200. doi: 10.4236/jemaa.2013.55031.
[1] J. J. Hirai, T. W. Kim and A. Kawamura, “Wireless Transmission of Power and Information for Cableless Linear Motor Drive,” IEEE Transactions on Power Electron, Vol. 15, No. 1, 2000, pp. 21-27. doi:10.1109/63.817358
[2] A. Kurs, A. Karalis, R. Moffatt, J. D. Joannopoulos, P. Fisher and M. Soljacic, “Wireless Power Transfer via Strongly Coupled Magnetic Resonances,” Science, Vol. 317, No. 5834, 2007, pp. 83-86. doi:10.1126/science.1143254
[3] ANSI/IEEE C63.4, “American National Standard for Methods of Measurement of Radio-Noise Emissions from Low-Voltage Electrical and Electronic Equipment in the Range of 9 kHz to 40 GHz,” ANSI/IEEE C63.4, 2004, pp. 1-135.
[4] E. M. Thomas, J. D. Heebl, C. Pfeiffer and A. Grbic, “A Power Link Study of Wireless Non-Radiative Power Transfer Systems Using Resonant Shielded Loops,” IEEE Transactions on Circuits and Systems I, Vol. 59, No. 9, 2012, pp. 2125-2136. doi:10.1109/TCSI.2012.2185295
[5] A. Karalis, J. D. Joannopoulos, and M. Soljacic, “Efficient Wireless Non-Radiative Mid-Range Energy Transfer,” Annals of Physics, Vol. 323, No. 1, 2008, pp. 34-48. doi:10.1016/j.aop.2007.04.017
[6] EM Software and Systems, “FEKO Suite 5.5,” 2012. www.feko.info
[7] Y. Rahmat-Samii and E. Michielssen, “Electromagnetic Optimization by Genetic Algorithms,” Wiley, New York, 1999.
[8] I. Lindell and A. Sihvola, “Transformation Method for Problems Involving Perfect Electromagnetic Conductor (PEMC) Structures,” IEEE Transactions on Antennas and Propagation, Vol. 53, No. 9, 2005, pp. 3003-3011. doi:10.1109/TAP.2005.854519