Relay Effect of Wireless Power Transfer Using Strongly Coupled Magnetic Resonances

Wireless power transfer using strongly coupled electromagnetic resonators is a recently explored technology. Although this technology is able to transmit electrical energy over a much longer distance than traditional near field methods, in some applications, its effective distance is still insuffici...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2011-05, Vol.47 (5), p.1478-1481
Main Authors: Zhang, Fei, Hackworth, Steven A., Fu, Weinong, Li, Chengliu, Mao, Zhihong, Sun, Mingui
Format: Article
Language:English
Subjects:
Couplings
Cross-disciplinary physics: materials science
rheology
Electricity
Energy exchange
Exact sciences and technology
Magnetic resonance
Magnetism
Materials science
Other topics in materials science
Physics
Relay effect
Relays
strongly coupled magnetic resonance
Wireless communication
wireless electricity
wireless power transfer
Wireless sensor networks
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Summary:Wireless power transfer using strongly coupled electromagnetic resonators is a recently explored technology. Although this technology is able to transmit electrical energy over a much longer distance than traditional near field methods, in some applications, its effective distance is still insufficient. In this paper, we investigate a relay effect to extend the energy transfer distance. Theoretical analysis is performed based on a set of coupled-mode equations. Experiments are conducted to confirm the theoretical results and demonstrate the effectiveness of the relay approach. Our results show that the efficiency of power transfer can be improved significantly using one or more relay resonators. This approach significantly improves the performance of the present two-resonator system and allows a curved path in space to be defined for wireless power transfer using smaller resonators.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2010.2087010