Wireless energy transfer with high-Q similar resonant frequency resonators

  • US 8,400,022 B2
  • Filed: 12/23/2009
  • Issued: 03/19/2013
  • Est. Priority Date: 07/12/2005
  • Status: Active Grant
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First Claim
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1. A method of transferring electromagnetic energy comprising:

  • providing a first electromagnetic resonator receiving energy from a power supply, said first resonator having a first mode with a resonant frequency ω

    1, an intrinsic loss rate Γ

    1, and a first Q-factor Q1

    1/(2Γ

    1);

    providing a second electromagnetic resonator being positioned distal from said first resonator and not electrically wired to the first resonator, said second resonator having a second mode with a resonant frequency ω

    2, an intrinsic loss rate Γ

    2, and a second Q-factor Q2

    2/(2Γ

    2); and

    transferring electromagnetic energy wirelessly from said first resonator to said second resonator over a distance D that is smaller than each of resonant wavelengths λ

    1 and λ

    2 corresponding to the resonant frequencies ω

    1 and ω

    2, respectively,wherein the electromagnetic resonators are designed to have √

    {square root over (Q1Q2)}>

    100; and

    wherein the absolute value of the difference of said resonant frequencies ω

    1 and ω

    2 is smaller than a magnitude of the wireless energy transfer rate, κ

    .

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