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In previous work, we have proposed a cone-shaped shifting medium shell that can shift the enclosed region forward to a given position. The shifting shell is a metamaterial device proposed according to transformation optics. It can be applied in a wireless power transfer system by covering the coils to move them closer in magnetic field and enhance the mutual inductance between the coils. However,...
Magnetic superlens is a homogeneous and isotropic solid planar slab with negative permeability (usually −1) and can be applied in a wireless power transfer system to enhance the power transfer efficiency. Metamaterials with negative permeability could be achieved by split-ring resonators (SRRs). To be applied in wireless power transfer systems, the metamaterials need to be low loss, low cost, compact...
Shifting medium is a kind of metamaterial, which can optically shift a space or an object a certain distance from the original place. In this paper, two shifting slabs covering the transmitting coil are proposed based on the concept of shifting medium to enhance the magnetic coupling of a two-coil wireless power transfer system. The electromagnetic parameters of the shifting slabs are calculated by...
In this paper, we propose a concise unit-cell design of magnetic metamaterial. The effective permeability of the unit cell is derived by S parameter method and can be flexibly adjusted to meet specific requirements. 6×6 planar metamaterial slabs are constructed by the proposed unit cells to verify their effects in a 6.78MHz wireless power transfer system. The effects of 1-slab and 2-slab metamaterials...
In this paper, we experimentally validate the effects of different structures of metamaterial on efficiency enhancement in a four-coil magnetic resonant wireless power transfer system operating at 6.78MHz. First, we propose a concise design of magnetic metamaterials. A 6×6 planar array metamaterial slab is simulated to investigate its effect on power transmission between transmitter and receiver....
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