POWER FEEDING SYSTEM DESIGN METHOD AND POWER FEEDING SYSTEM

Disclosed is a method of designing a power feeding system achieving critical coupling at a desired resonance frequency without adjusting a size or a distance of a coil, and thus obtain high transmission efficiency over broad band. The method includes designing impedances of the power feeding (3) and The power receiving unit (5) to be small as a resonance frequency between the power feeding helical coil (33) and the power receiving helical coil (51) becomes small by adjusting impedances of the DC/AC converter (31) and the AC/DC converter (51).