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J. Electromagn. Eng. Sci > Volume 16(4); 2016 > Article
Journal of Electromagnetic Engineering and Science 2016;16(4):232-234.
DOI: https://doi.org/10.5515/JKIEES.2016.16.4.232   
Comparative Study on the Power Transfer Efficiency of Magnetic Resonance and Radio Frequency Wireless Power Transmission
Ye-Chan Kim, Bo-Hee Choi, Jeong-Hae Lee
Department of Electronic and Electrical Engineering, Hongik University
Correspondence:  Jeong-Hae Lee,Email: jeonglee@hongik.ac.kr
Abstract
In this paper, the power transfer efficiencies (PTEs) of magnetic resonance (MR) wireless power transmission (WPT) and radio frequency (RF) WPT are compared as a function of the distances between resonators (or antennas). The PTE of the C-loaded loop resonators during MR WPT was theoretically calculated and simulated at 6.78MHz, showing good agreement. The PTE of the patch antennas, whose area is the same as the C-loaded loop resonator during MR WPT, was theoretically calculated using the Friis equation and the equation by N. Shinohara and simulated at 5.8 GHz. The three results from the Friis equation, the equation by N. Shinohara, and from a full wave simulation are in strong agreement. The PTEs, when using the same size resonators and antennas are compared by considering the distance between the receiver and transmitter. The compared results show that the MR WPT PTE is higher than that of the RF WPT PTE when the distance (r) between the resonators (or antennas) is shorter. However, the RF WPT PTE is much higher than that of the MR WPT PTE when the distance (r) between the resonators (or antennas) is longer since the RF WPT PTE is proportional to $r^{-2}$ while the MR WPT PTE is proportional to $r^{-6}$.
Key words: Magnetic Resonance Wireless Power Transmission, Radio Frequency Wireless Power Transmission
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