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

By Y. Urzhumov, David R. Smith. 2011

199 citations recorded by the source corpus.

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.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/23dc354348ef8c9e8c397b06d3095902c62a4f5b

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In Electrical and Electronic Engineering

  1. Hema Singh
  2. R. Jha
  3. Zhenshi Wang
  4. H. Sneha
  5. Xuezhe Wei
  6. Haifeng Dai

In Electronic, Optical and Magnetic Materials

  1. Hema Singh
  2. R. Jha
  3. Zhenshi Wang
  4. H. Sneha
  5. Xuezhe Wei
  6. Haifeng Dai

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