Some consequences of the properties of metamaterials for wireless power transfer

Wireless power transfer systems using realy coils are equivalent to one and two dimensional magnetoinductive waveguides. Useful insights may be gained by considering the properties of these waves in the context of such systems. Standing wave effects dominate multipoint power transfer strategies and limit the efficiency. Simple methods to aleviate these problems are described. Using these methods, power transfer efficiencies of > 70% can be achieved with relatively simple structures.