A wireless power transmission system includes a primary circuit and a secondary circuit, which are coupled through coupling coils. The primary circuit includes an alternating current (AC) power supply source that provides an alternating current signal through a series connection of a primary capacitor and a primary coil. The secondary circuit includes a parallel connection of a secondary coil, a secondary capacitor, and a load. The resonance frequency f.sub.0 of the wireless power transmission system is a frequency at which the power transfer efficiency of the wireless transmission system achieves a maximum for an infinitesimally small resistive load. The operational frequency of the AC power supply source is selected to be above the resonance frequency f.sub.0 so as to provide greater efficiency and/or greater power transfer rate in the presence of a finite impedance load.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
 This invention was made with United States government support under Prime Contract No. DE-AC05-00OR22725 awarded by the U.S. Department of Energy. The United States government has certain rights in this invention.