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Recently wireless power transmission technology attracts attention. A method using magnetic resonant wireless power driven by about 10MHz, examination such as improvement of the transmission efficiency or the extension of the transmission distance is researched. On the other hand, we are interested in possibility of the reduction of the thickness of the antenna coil. In addition, we are studying high efficiency power transmission at short distance to reduce leakage magnetic flux. We investigated the structure parameter of the spiral type coil antenna that the transmission of the high efficiency could be possible in case of short distance. The control possibility of the transmission distance by the adjustment of this structure parameter was derived.

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