Mid-range adiabatic wireless energy transfer via a mediator coil

A technique for efficient mid-range wireless energy transfer between two coils via a mediator coil is proposed. By varying the coil frequencies, three resonances are created: emitter–mediator (EM), mediator–receiver (MR) and emitter–receiver (ER). If the frequency sweeps are adiabatic and such that the EM resonance precedes the MR resonance, the energy flows sequentially along the chain emitter–mediator–receiver. If the MR resonance precedes the EM resonance, then the energy flows directly from the emitter to the receiver via the ER resonance; then the losses from the mediator are suppressed. This technique is robust against noise, resonant constraints and external interferences.

► Efficient and robust mid-range wireless energy transfer via a mediator coil.
► The adiabatic energy transfer is analogous to adiabatic passage in quantum optics.
► Wireless energy transfer is insensitive to any resonant constraints.
► Wireless energy transfer is insensitive to noise in the neighborhood of the coils.