Wireless power transfer based on dielectric resonators with colossal permittivity

Magnetic resonant wireless power transfer system based on dielectric disk resonators made of colossal permittivity (epsilon = 1000) and low loss (tan delta = 2.5 x 10(-4)) microwave ceramic is experimentally investigated. The system operates at the magnetic dipole mode excited in the resonators providing maximal power transfer efficiency of 90% at the frequency 232 MHz. By applying an impedance matching technique, the efficiency of 50% is achieved within the separation between the resonators d = 16 cm (3.8 radii of the resonator). The separation, misalignment and rotation dependencies of wireless power transfer efficiency are experimentally studied. Published by AIP Publishing.