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dc.contributor.author Urzhumov, Y
dc.contributor.author Smith, DR
dc.date.accessioned 2012-01-18T14:47:20Z
dc.date.issued 2011-05-18
dc.identifier.citation Physical Review B - Condensed Matter and Materials Physics, 2011, 83 (20)
dc.identifier.issn 1098-0121
dc.identifier.uri http://hdl.handle.net/10161/5076
dc.description.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.
dc.language.iso en_US en_US
dc.relation.ispartof Physical Review B - Condensed Matter and Materials Physics
dc.relation.isversionof 10.1103/PhysRevB.83.205114
dc.title Metamaterial-enhanced coupling between magnetic dipoles for efficient wireless power transfer
dc.type Journal Article
pubs.issue 20
pubs.organisational-group /Duke
pubs.organisational-group /Duke/Institutes and Provost's Academic Units
pubs.organisational-group /Duke/Institutes and Provost's Academic Units/Initiatives
pubs.organisational-group /Duke/Institutes and Provost's Academic Units/Initiatives/Energy Initiative
pubs.organisational-group /Duke/Pratt School of Engineering
pubs.organisational-group /Duke/Pratt School of Engineering/Electrical and Computer Engineering
pubs.publication-status Published
pubs.volume 83
dc.identifier.eissn 1550-235X

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