Wireless energy transfer over variable distances between resonators of substantially similar resonant frequencies

  • US 8,760,008 B2
  • Filed: 12/30/2009
  • Issued: 06/24/2014
  • Est. Priority Date: 07/12/2005
  • Status: Active Grant
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First Claim
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1. A system, comprising:

  • a first resonator having a resonant frequency ω

    1 and an intrinsic loss rate Γ

    1, and capable of storing electromagnetic energy with a high intrinsic quality factor Q1

    1/(2Γ

    1), and configured to be coupled to an energy source; and

    a second resonator having a resonant frequency ω

    2 and an intrinsic loss rate Γ

    2, and capable of storing electromagnetic energy with a high intrinsic quality factor Q2

    2/(2Γ

    2), located a variable distance D from the first resonator;

    wherein the first resonator and the second resonator are configured to be resonantly coupled to provide near-field wireless energy transfer among the first resonator and the second resonator over the variable distance D when the first resonator is coupled to the energy source;

    wherein the variable distance D is no more than ten times the characteristic size L2 of the second resonator and wherein the efficiency of the wireless energy transfer is at least 20%, andwherein Q1>

    100 and Q2>

    100.

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