Extended Explanation Of Transformation Optics For Metamaterial-Modified Wireless Power Transfer Systems

We analytically extend the scope of transformation optics (TO) to metamaterial-modified wireless power transfer (WPT) systems and demonstrate that the extended TO can help design the highly efficient WPT. The methodology is based on rigorous scattering theory, enabling an equivalent model under certain circumstances to be established, that can significantly simplify investigating metamaterial-enhanced WPT. More important, from the analytical study on the equivalent model, we prove that TO is still applicable, even when the conditions of complementary media are not satisfied. Our findings are verified numerically using our methodology as well as COMSOL simulations. Moreover, a further study also indicates the extended TO explanation as well as the analysis of the equivalent model could help improve the transfer efficiency of WPT significantly. The demonstrations are not restricted to any specific frequency, and the conclusions could be extended to a broad range of wavelengths, including applications to active cloaks and other related devices. (C) 2016 AIP Publishing LLC.