1. Poon, A. S. Y., "A general solution to wireless power transfer between two circular loop," Progress In Electromagnetics Research, Vol. 148, 171-182, 2014.
doi:10.2528/PIER14071201
2. Ye, Z. H., Y. Sun, X. Dai, C. S. Tang, Z. H. Wang, and Y. G. Su, "Energy efficiency analysis of U-coil wireless power transfer system," IEEE Trans. Power Electron., Vol. 31, 4809-4817, 2016.
doi:10.1109/TPEL.2015.2446501
3. Badawe, M. E. and O. M. Ramahi, "Efficient metasurface rectenna for electromagnetic wireless power transfer and energy harvesting," Progress In Electromagnetics Research, Vol. 161, 35-40, 2018.
4. Hui, S. Y. R., W. Zhong, and C. K. Lee, "A critical review of recent progress in mid-range wireless power transfer," IEEE Trans. Power Electron., Vol. 29, 4500-4511, 2014.
doi:10.1109/TPEL.2013.2249670
5. Chu, Y. C., N. S. Artan, D. Czarkowski, C. L. R. Chang, and J. Chao, "High-efficiency high-current drive power converter IC for wearable medical devices," IEICE Electron. Express, Vol. 12, 2015.
doi:10.1587/elex.12.20150953
6. Jang, B. J., S. Lee, and H. Yoon, "HF-band wireless power transfer system: Concept, issues, and design," Progress In Electromagnetics Research, Vol. 124, 211-231, 2012.
doi:10.2528/PIER11120511
7. Liu, F. X., Y. Yang, D. Jiang, X. Ruan, and X. Chen, "Modeling and optimization of magnetically coupled resonant wireless power transfer system with varying spatial scales," IEEE Trans. Power Electron., Vol. 32, 3240-3250, 2017.
doi:10.1109/TPEL.2016.2581840
8. Kim, J., W. S. Choi, and J. Jeong, "Loop switching technique for wireless power transfer using magnetic resonance coupling," Progress In Electromagnetics Research, Vol. 138, 197-209, 2013.
doi:10.2528/PIER13012118
9. Fan, Y., L. Li, S. Yu, C. Zhu, and C. H. Liang, "Experimental study of efficient wireless power transfer system integrating with highly sub-wavelength metamaterials," Progress In Electromagnetics Research, Vol. 141, 769-784, 2013.
doi:10.2528/PIER13061711
10. Lee, W. S., K. S. Oh, and J. W. Yu, "Distance-insensitive wireless power transfer and near-field communication using a current-controlled loop with a loaded capacitance," IEEE Trans. Antennas Propagat., Vol. 62, 936-940, 2014.
doi:10.1109/TAP.2013.2290549
11. Zhang, X. Y., C. D. Xue, and J. K. Lin, "Distance-insensitive wireless power transfer using mixed electric and magnetic coupling for frequency splitting suppression," IEEE Trans. Microw. Theory Tech., 1-10, 2017.
12. Niu, W., W. Gu, J. Chu, and A. Shen, "Frequency splitting patterns in wireless power relay transfer," Circuits Devices Syst. Lett., Vol. 8, 561-567, 2014.
doi:10.1049/iet-cds.2013.0440
13. Zhang, Y. M., Z. M. Zhao, and K. N. Chen, "Frequency-splitting analysis of four-Coil resonant wireless power transfer," IEEE Trans. Ind. Appl., Vol. 50, 2436-2445, 2014.
doi:10.1109/TIA.2013.2295007
14. Yeo, T. D., D. S. Kwon, S. T. Khang, and J. W. Yu, "Design of maximum efficiency tracking control scheme for closed-loop wireless power charging system employing series resonant tank," IEEE Trans. Power Electron., Vol. 32, 471-478, 2017.
doi:10.1109/TPEL.2016.2523121
15. Lee, K. and D. H. Cho, "Analysis of wireless power transfer for adjustable power distribution among multiple receivers," IEEE Antennas Wireless Propag. Lett., Vol. 14, 950-953, 2015.
doi:10.1109/LAWP.2015.2388711
16. Kim, J., D. H. Kim, and Y. J. Park, "Analysis of capacitive impedance matching networks for simultaneous wireless power transfer to multiple devices," IEEE Trans. Ind. Electron., Vol. 62, 2807-2813, 2015.
doi:10.1109/TIE.2014.2365751
17. Lyu, Y. L., F. Y. Meng, G. H. Yang, B. J. Che, and Q. Wu, "A method of using nonidentical resonant coils for frequency splitting elimination in wireless power transfer," IEEE Trans. Power Electron., Vol. 30, 6097-6107, 2015.
doi:10.1109/TPEL.2014.2387835
18. Lee, W. S., W. I. Son, K. S. Oh, and J. W. Yu, "Contactless energy transfer systems using antiparallel resonant loops," IEEE Trans. Ind. Electron., Vol. 60, 350-359, 2013.
doi:10.1109/TIE.2011.2177611