Wireless energy transfer with high-Q sub-wavelength resonators

  • US 8,400,021 B2
  • Filed: 12/16/2009
  • 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 system of transferring electromagnetic energy comprising:

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

    1, an intrinsic loss rate Γ

    1, an inductance L1, and a first Q-factor Q1

    1L1/(R1ohm+R1rad), wherein R1ohm is the ohmic component of resistance in the first electromagnetic resonator and R1rad is the radiative component of resistance in the first resonator;

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

    2, an intrinsic loss rate Γ

    2, and inductance L2, and a second Q-factor Q2

    2L2/(R2ohm+R2rad), wherein R2ohm is the ohmic component of resistance in the second electromagnetic resonator and R2rad is the radiative component of resistance in the second electromagnetic resonator; and

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

    1 and λ

    2 corresponding to the resonant frequencies ω

    1 and ω

    2, respectively,wherein √

    {square root over (Q1Q2)}>

    100, R1ohm>

    R1rad, and R2ohm>

    R2rad.

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