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Sensors 2016, 16(8), 1219; doi:10.3390/s16081219

Analysis and Optimization of Four-Coil Planar Magnetically Coupled Printed Spiral Resonators

Department of Information and Communication Engineering, SoC Design Laboratory, Chosun University, Gwangju 61452, Korea
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Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 2 June 2016 / Revised: 21 July 2016 / Accepted: 29 July 2016 / Published: 3 August 2016
(This article belongs to the Section Physical Sensors)

Abstract

High-efficiency power transfer at a long distance can be efficiently established using resonance-based wireless techniques. In contrast to the conventional two-coil-based inductive links, this paper presents a magnetically coupled fully planar four-coil printed spiral resonator-based wireless power-transfer system that compensates the adverse effect of low coupling and improves efficiency by using high quality-factor coils. A conformal architecture is adopted to reduce the transmitter and receiver sizes. Both square architecture and circular architectures are analyzed and optimized to provide maximum efficiency at a certain operating distance. Furthermore, their performance is compared on the basis of the power-transfer efficiency and power delivered to the load. Square resonators can produce higher measured power-transfer efficiency (79.8%) than circular resonators (78.43%) when the distance between the transmitter and receiver coils is 10 mm of air medium at a resonant frequency of 13.56 MHz. On the other hand, circular coils can deliver higher power (443.5 mW) to the load than the square coils (396 mW) under the same medium properties. The performance of the proposed structures is investigated by simulation using a three-layer human-tissue medium and by experimentation. View Full-Text
Keywords: bio-implantable devices; magnetic resonance coupling; power delivered to the load; power-transfer efficiency; quality factor bio-implantable devices; magnetic resonance coupling; power delivered to the load; power-transfer efficiency; quality factor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Khan, S.R.; Choi, G. Analysis and Optimization of Four-Coil Planar Magnetically Coupled Printed Spiral Resonators. Sensors 2016, 16, 1219.

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