Leakage magnetic field suppression using wireless power transmission with sandwiched structure

Abstract

We proposed sandwich structure as a wireless power transmission system. The structure is more robust than a conventional type, where a pair of transmission receiving coils is employed, because in the present structure two receiving coils were placed between two transmission coils. The analysis revealed that the leakage magnetic field of the structure depends on the direction of currents flowing in the coils. In this paper, we report the intensity of the leakage magnetic field and the radiation pattern obtained for measurement results associated with an oscillation frequency of 85kHz. The results showed that the leakage magnetic field was suppressed when the coils are coupled in different directions.