Fabrication of a new high-performance WPT system by electric energy confinement

A WPT system based on coupled resonators makes use of the electric and magnetic couplings. Considering one can control the ratio of those couplings, it should be useful to reduce the electric coupling, since it is affected by the dielectric material that intrudes between the two resonators, resulting in the shift of operating frequency, deterioration of matching and increase of transfer loss. The present paper studies two methods to avoid them, that is, electric energy confinement by external lumped capacitor and by double layered coils. Both try to confine the electric energy of the resonators into a limited space and remove from the coupling space. Carrying out a comparative study, it concludes the latter is more desirable by the overall rating.