Patent ID: 8760008

Claim:
A system, comprising: a first resonator having a resonant frequency ω 1 and an intrinsic loss rate Γ 1 , and capable of storing electromagnetic energy with a high intrinsic quality factor Q 1 =ω 1 /(2Γ 1 ), and configured to be coupled to an energy source; and a second resonator having a resonant frequency ω 2 and an intrinsic loss rate Γ 2 , and capable of storing electromagnetic energy with a high intrinsic quality factor Q 2 =ω 2 /(2Γ 2 ), located a variable distance D from the first resonator; wherein the first resonator and the second resonator are configured to be resonantly coupled to provide near-field wireless energy transfer among the first resonator and the second resonator over the variable distance D when the first resonator is coupled to the energy source; wherein the variable distance D is no more than ten times the characteristic size L 2 of the second resonator and wherein the efficiency of the wireless energy transfer is at least 20%, and wherein Q 1 >100 and Q 2 >100.