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Efficiency of Contactless Power Transmission in a Long Distance

This paper describes a power transmission in a long distance of the contactless power transmission by magnetic resonance method. The efficiency of magnetic resonant coupling method is high, however, the efficiency starts to decrease gradually at certain distance. This is because the increase of leakage flux of the sending coil. In this paper, the leakage flux and transmission performance in a long distance are investigated by simulation and experiment.