Wireless energy transfer across variable distances

  • US 8,400,024 B2
  • Filed: 12/30/2009
  • 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 electromagnetic resonator having a resonant frequency ω

    1, an intrinsic loss rate Γ

    1, an inductance L1, an ohmic component of resistance R1ohm, a radiative component of resistance R1rad, and a first Q-factor Q1

    1L1/(R1ohm+R1rad), and generating a near field region comprising a temporally oscillating magnetic field;

    providing a second electromagnetic resonator being positioned at variable distances from said first electromagnetic resonator and not electrically wired to said first electromagnetic resonator, said second electromagnetic resonator having a resonant frequency ω

    2, an intrinsic loss rate Γ

    2, an inductance L2, an ohmic component of resistance R2ohm, a radiative component of resistance R2rad, and a second Q-factor Q2

    2L2/(R2ohm+R2rad); and

    wirelessly transferring electromagnetic energy from said first electromagnetic resonator to said second electromagnetic resonator over a variable distance D as the second electromagnetic resonator moves freely within the near-field region, and wherein R1ohm>

    R1rad, and R2ohm>

    R2rad and at least one of Q1 and Q2 is greater than 100.

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