A magnetically resonant wireless power transmission board (MR-WPTB) on a printed-circuit board is developed. MR-WPTB wirelessly supplies the power to electronic devices such as smartphones anywhere on the board with high efficiency. In order to increase a power transmission efficiency degraded by a misalignment of a receiver coil, a transmitter coil array and a proposed staggered repeater coil array (SRCA) are stacked in MR-WPTB. 1 transmitter coil closest to the receiver coil and the surrounding 4 repeater coils are selectively activated based on the result of a position detection of the receiver coil. By adding SRCA to the transmitter coil array, the measured power transmission efficiency at the worst case misalignment increases from 4.8% to 64% at a distance of 15mm between the transmitter and receiver coils with a diameter of 40mm.
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