Radially Periodic Metasurface Lenses for Magnetic Field Collimation in Resonant Wireless Power Transfer Applications

In this paper, a new procedure and topology of magnetic metasurface lens are proposed for improving the performance Resonant Wireless Power Transfer systems. Firstly, three subwave-length unit cells optimized in order to get negative permeability same frequency, each one with different refractive index, they experimentally characterized. Then, Transformation Optics technique is applied find cell arrangements which lead field focusing given direction. For purpose, two coordinate transformations proposed, effective electric permittivity that generate these profiles calculated. It shown from simulations measurements index gradient produced by radial disposition can manipulation similar optical converging diverging lenses. Both metamaterials lenses built, calculation flux density as function measured induced voltage probe coil verifies their effects on field. Finally, resonant wireless power transfer system tested, improvements terms efficiency range presented. The design method were developed demonstrate improve without reducing range, once positioned close transmitter coil. Besides that, reduce losses due misalignment between coils be collimated specific