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Investigation on the human body exposure to the magnetic fields owing to wireless power transmission system with the sandwiched structure

Currently, a “sandwiched structure” has been proposed for the wireless power transmission system, which is suitable for personal mobility. The sandwiched structure is constructed by two power receiving coils and two power transmission coils. The two power receiving coils are sandwiched between two power transmission coils. This structure stabilizes power transmission, regardless of changes in position for the power receiving coils to the power transmission coils. In this paper, induced electric fields in the human body are calculated under the exposure of 85 kHz magnetic fields generated by sandwiched structure and conventional structure. Accordingly, it was found that when the same power is transmitted, the median value of induced electric field is reduced by the sandwiched structure rather than by the conventional structure.