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US 8,395,282 B2Granted
Wireless non-radiative energy transfer
AssigneeMassachusetts Institute of Technology
InventorsJohn D. Joannopoulos, Aristeidis Karalis, Marin Soljacic
Life of this patent
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Abstract
The electromagnetic energy transfer device includes a first resonator structure receiving energy from an external power supply. The first resonator structure has a first Q-factor. A second resonator structure is positioned distal from the first resonator structure, and supplies useful working power to an external load. The second resonator structure has a second Q-factor. The distance between the two resonators can be larger than the characteristic size of each resonator. Non-radiative energy transfer between the first resonator structure and the second resonator structure is mediated through coupling of their resonant-field evanescent tails.
Claims22
A system, comprising:
- a source resonator, configured to be coupled to an energy source, the source resonator having a resonant frequency ω1 and an intrinsic loss rate Γ1, and capable of storing electromagnetic energy with a high intrinsic quality factor Q1=ω1/(2Γ1), and
- a second resonator, the second resonator having a resonant frequency ω2 and an intrinsic loss rate Γ2, and capable of storing electromagnetic energy with a high intrinsic quality factor Q2=ω2/(2Γ2),
- wherein at least one of the resonators has a characteristic size greater than or equal to 1 cm, and
- wherein the source resonator and second resonator are configured to be electro-magnetically coupled to exchange energy over a distance a few times the characteristic size via non-radiative wireless energy transfer.
1 more element
A system, comprising:
- a source resonator, configured to be coupled to an energy source, the source resonator having a resonant frequency ω1 and an intrinsic loss rate Γ1, and capable of storing electromagnetic energy with a high intrinsic quality factor Q1 =ω1 / (2Γ1), and
- a second resonator, the second resonator having a resonant frequency ω2 and an intrinsic loss rate Γ2, and capable of storing electromagnetic energy with a high intrinsic quality factor Q2=ω2/(2Γ2),
- wherein at least one of the resonators has a characteristic size greater than or equal to 30 cm, and
- wherein the source resonator and second resonator are configured to be electro-magnetically coupled to exchange energy over a distance a few times the characteristic size via non-radiative wireless energy transfer.
1 more element
A system, comprising:
- a source resonator, configured to be coupled to an energy source, the source resonator having a resonant frequency ω1 and an intrinsic loss rate Γ1, and capable of storing electromagnetic energy with a high intrinsic quality factor Q1=ω1/(2Γ1), and
- a second resonator, the second resonator having a resonant frequency ω2 and an intrinsic loss rate Γ2, and capable of storing electromagnetic energy with a high intrinsic quality factor Q2=ω2/(2Γ2),
- wherein at least one of the resonators has a characteristic size greater than or equal to 60 cm, and
- wherein the source resonator and second resonator are configured to be electro-magnetically coupled to exchange energy over a distance a few times the characteristic size via non-radiative wireless energy transfer.
1 more element
A system, comprising:
- a source resonator, configured to be coupled to an energy source, the source resonator having a resonant frequency ω1 and an intrinsic loss rate Γ1, and capable of storing electromagnetic energy with a high intrinsic quality factor and Q1=ω1/(2Γ1), and
- a second resonator, the second resonator having a resonant frequency ω2 and an intrinsic loss rate Γ2, and capable of storing electromagnetic energy with a high intrinsic quality factor Q2=ω2/(2Γ2),
- wherein the source resonator and second resonator are configured to be electro-magnetically coupled to exchange energy over a distance greater than 30 cm via non-radiative wireless energy transfer.
A system, comprising:
- a source resonator, configured to be coupled to an energy source, the source resonator having a resonant frequency ω1 and an intrinsic loss rate Γ1, and capable of storing electromagnetic energy with a high intrinsic quality factor Q=ω/(2Γ1), and
- a second resonator, the second resonator having a resonant frequency ω2 and an intrinsic loss rate Γ2, and capable of storing electromagnetic energy with a high intrinsic quality factor Q2=ω2/(2Γ2),
- wherein the source resonator and second resonator are configured to be electro-magnetically coupled to exchange energy over a distance greater than 60 cm via non-radiative wireless energy transfer.
A system, comprising:
- a source resonator, configured to be coupled to an energy source, the source resonator having a resonant frequency ω1 and an intrinsic loss rate Γ1, and capable of storing electromagnetic energy with a high intrinsic quality factor Q1=ω1/(2Γ1), and
- a second resonator, the second resonator having a resonant frequency ω2 and an intrinsic loss rate Γ2, and capable of storing electromagnetic energy with a high intrinsic quality factor Q2=ω2/(2Γ2),
- wherein the source resonator and second resonator are configured to be electro-magnetically coupled to exchange energy over a distance of a few meters via non-radiative wireless energy transfer.
Dependencies are inferred from the claim text.