Surface resonator for wireless power transmission systems with stable working frequency and high quality factor

A surface resonator is used to improve the efficiency and working-frequency stability of three- and four-coil wireless power transmission (WPT) systems in both simulations and experiments. A surface resonator comprises chip capacitors and a structured printed circuit board. Compared to the simple three-coil WPT system, the transmission coefficient is increased by similar to 10% for mid-range transmission in a three-coil WPT system with a surface resonator, and the quality factor is enhanced. For a four-coil WPT system with a surface resonator, the quality factor is improved without drastic reduction in transmittance. Moreover, by introducing a surface resonator, working-frequency splitting is suppressed strongly for short-range transmission in three- and four-coil WPT systems. The present findings will help in designing WPT systems for practical applications.

Automated summary

The use of surface resonators in wireless power transmission systems can improve transmission efficiency and working frequency stability. Systems with surface resonators also exhibit an increase in quality factor.