Wireless energy transfer across variable distances with high-Q capacitively-loaded conducting-wire loops

  • US 8,772,971 B2
  • Filed: 12/30/2009
  • Issued: 07/08/2014
  • Est. Priority Date: 07/12/2005
  • Status: Active Grant
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First Claim
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1. A system, comprising:

  • at least one source resonator configured to be coupled to an energy source to generate an electromagnetic near field region; and

    at least one device resonator located at a variable distance D from the at least one source resonator within the at least one source resonator'"'"'s near-field region to enable resonant wireless energy transfer between the at least one source resonator and the at least one device resonator when the at least one source resonator is coupled to the energy source,wherein at least two of the resonators comprise high-Q capacitively-loaded conducting-wire loops,wherein the first high-Q capacitively-loaded conducting wire loop has a resonant frequency ω

    1 and an intrinsic loss rate Γ

    1, and is capable of storing electromagnetic energy with an intrinsic quality factor Q1

    1/(2Γ

    1) greater than 100,wherein the second high-Q capacitively-loaded conducting wire loop has a resonant frequency ω

    2 and an intrinsic loss rate Γ

    2, and is capable of storing electromagnetic energy with an intrinsic quality factor Q2

    1/(2Γ

    2) greater than 100, andwherein D is less than the wavelengths λ

    1=c/2π

    ω

    1 and λ

    2=c/2π

    ω

    2 corresponding to the resonant frequencies ω

    1 and ω

    2, respectively, where c is the speed of light.

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