volume | PIER Journals

Abstract

Deep sub-wavelength metamaterials for a wireless power transfer system (WPT) is still a challenge in design and optimization. We propose a large capacitor spiral metamaterial (LCSM) which involves inherent advantages of low operating frequencies and compact structures. The ratio of electromagnetic wavelength to the metamaterial scale can easily reach 1000 at the operation frequency of several megahertz. A hybrid search method, which combines a modified simulated annealing algorithm and a differential evolution algorithm, is applied to the accurate and automatic design of LCSM. The permeability of LCSM is evaluated by finite element analysis and then verified by experimental results. Finally, a small-size WPT system working at 6.78 MHz was constructed to evaluate LCSM. The results show that LCSM can enhance the transfer efficiency of the WPT system from 5.54% to 22.40% at a transmission distance of 15 cm.

1. Tesla, N., "The transmission of electrical energy without wires as a means for furthering peace," Electrical World & Engineer, 1905.

2. Kalwar, K. A., M. Aamir, and S. Mekhilef, "Inductively coupled power transfer (ICPT) for electric vehicle charging --- A review," Renewable & Sustainable Energy Reviews, Vol. 47, 462-475, 2015.
doi:10.1016/j.rser.2015.03.040

3. Barman, S. D., A. W. Reza, N. Kumar, M. E. Karim, and A. B. Munir, "Wireless powering by magnetic resonant coupling: Recent trends in wireless power transfer system and its applications," Renewable & Sustainable Energy Reviews, Vol. 51, 1525-1552, 2015.
doi:10.1016/j.rser.2015.07.031

4. Kurs, A., 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, 83, 2007.
doi:10.1126/science.1143254

5. Wang, B., T. Nishino, and K. H. Teo, "Wireless power transmission efficiency enhancement with metamaterials," IEEE International Conference on Wireless Information Technology and Systems, 1-4, 2010.

6. Urzhumov, Y. and D. R. Smith, "Metamaterial-enhanced coupling between magnetic dipoles for efficient wireless power transfer," Physical Review B, Vol. 83, No. 20, 99-105, 2011.
doi:10.1103/PhysRevB.83.205114

7. Choi, J. and C. H. Seo, "High-efficiency wireless energy transmission using magnetic resonance based on negative refractive index metamaterial," Progress in Electromagnetics Research, Vol. 106, 33-47, 2010.
doi:10.2528/PIER10050609

8. Wang, B., K. H. Teo, T. Nishino, W. Yerazunis, J. Barnwell, and J. Zhang, "Experiments on wireless power transfer with metamaterials," Applied Physics Letters, Vol. 98, No. 25, 254101, 2011.
doi:10.1063/1.3601927

9. Ranaweera, A. L. A. K., T. P. Duong, and J. W. Lee, "Experimental investigation of compact metamaterial for high efficiency mid-range wireless power transfer applications," Journal of Applied Physics, Vol. 116, No. 4, 83-86, 2014.
doi:10.1063/1.4891715

10. Rodrıguez, E. S. G., A. K. Ramrakhyani, D. Schurig, and G. Lazzi, "Compact low-frequency metamaterial design for wireless power transfer efficiency enhancement," IEEE Transactions on Microwave Theory & Techniques, Vol. 64, No. 5, 1644-1654, 2016.
doi:10.1109/TMTT.2016.2549526

11. Engineers, E. E. and I. S. Board, "Ieee standard for safety levels with respect to human exposure to radio frequency electromagnetic fields, 3 KHz to 300 GHz," IEEE Std. C., 1, 2002.

12. Chen, W. C., C. M. Bingham, K. M. Mak, N. W. Caira, and W. J. Padilla, "Extremely sub-wavelength planar magnetic metamaterials," Physical Review B, Vol. 85, No. 20, 1614-1621, 2012.

13. Zhou, S., W. Li, G. Sun, and Q. Li, "A level-set procedure for the design of electromagnetic metamaterials," Optics Express, Vol. 18, No. 7, 6693, 2010.
doi:10.1364/OE.18.006693

14. Chen, P. Y., C. H. Chen, H. Wang, J. H. Tsai, and W. X. Ni, "Synthesis design of artificial magnetic metamaterials using a genetic algorithm," Optics Express, Vol. 16, No. 17, 12806, 2008.
doi:10.1364/OE.16.012806

15. Zhu, H., X. Luo, C. Zhao, Z. Hong, and Z. Huang, "Design and optimization of deep sub-wavelength metamaterials using a hybrid search algorithm," Wireless Power Transfer Conference, 2017.

16. Storn, R. and K. Price, "Differential evolution --- A simple and efficient heuristic for global optimization over continuous spaces," Journal of Global Optimization, Vol. 11, No. 4, 341-359, 1997.
doi:10.1023/A:1008202821328

17. Kirkpatrick, S., C. D. Gelatt, Jr., and M. P. Vecchi, "Optimization by simulated annealing," Readings in Computer Vision, Vol. 220, No. 4598, 606-615, 1983.

18. Wu, Q., Y. H. Li, N. Gao, F. Yang, Y. Q. Chen, K. Fang, Y. W. Zhang, and H. Chen, "Wireless power transfer based on magnetic metamaterials consisting of assembled ultra-subwavelength metaatoms," EPL, Vol. 109, No. 6, 2015.
doi:10.1209/0295-5075/109/68005

19. Smith, D. R., D. C. Vier, T. Koschny, and C. M. Soukoulis, "Electromagnetic parameter retrieval from inhomogeneous metamaterials," Physical Review E Statistical Nonlinear & Soft Matter Physics, Vol. 71, No. 3, Pt. 2B, 036617, 2005.

Dr. Chunyu Zhao

Dr. Senlin Zhu

Dr. Hui Zhu

Dr. Zhenyu Huang

Dr. Xudong Luo