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Wireless power transfer has its roots in Tesla’s experiments and his proposition that electric power can be transferred not only by means of radiation, but also by means of induction and resonant coupling. Recent trends in the development of this technology are addressed. Also the basic mathematical ideas that help us understand the various parameters and issues for optimization of power transfer are given. The power in a given load in case of two coils is compared with that obtained in a modified set up consisting of three coils and it is shown that by proper choice of coupling coefficients, one might improvise the existing methods.

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