Study on a purely electric-field coupled resonator for WPT systems

We investigate a toroidal coil as a purely electric-field coupled resonator in the present paper, since we have studied a two-layered spiral coils as a purely magnetic-field coupled resonator before. We will explain the difference of structure and property of each resonator first, and then check the parametric characteristic of the toroidal coil resonator through measurement and analysis. Then, we compare it with the conventional electric field coupling system. In consequence, the benefits and features of the toroidal coil resonator could be clarified for use in WPT systems.