Metamaterial-enhanced coupling between magnetic dipoles for efficient wireless power transfer

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2011-05-18

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Abstract

Nonradiative coupling between conductive coils is a candidate mechanism for wireless energy transfer applications. In this paper we propose a power relay system based on a near-field metamaterial superlens and present a thorough theoretical analysis of this system. We use time-harmonic circuit formalism to describe all interactions between two coils attached to external circuits and a slab of anisotropic medium with homogeneous permittivity and permeability. The fields of the coils are found in the point-dipole approximation using Sommerfeld integrals which are reduced to standard special functions in the long-wavelength limit. We show that, even with a realistic magnetic loss tangent of order 0.1, the power transfer efficiency with the slab can be an order of magnitude greater than free-space efficiency when the load resistance exceeds a certain threshold value. We also find that the volume occupied by the metamaterial between the coils can be greatly compressed by employing magnetic permeability with a large anisotropy ratio. © 2011 American Physical Society.

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Published Version (Please cite this version)

10.1103/PhysRevB.83.205114

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Urzhumov, Y, and DR Smith (2011). Metamaterial-enhanced coupling between magnetic dipoles for efficient wireless power transfer. Physical Review B - Condensed Matter and Materials Physics, 83(20). 10.1103/PhysRevB.83.205114 Retrieved from https://hdl.handle.net/10161/5076.

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