Wireless energy transfer with high-Q to more than one device

  • US 8,760,007 B2
  • Filed: 12/16/2009
  • 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 source resonator having a resonant frequency ω

    1, an intrinsic loss rate Γ

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

    1/(2Γ

    1), the source resonator configured to be coupled to an energy source;

    a second resonator having a resonant frequency ω

    2, an intrinsic loss rate Γ

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

    2 /(2Γ

    2), the second resonator located a distance from the source resonator; and

    a third resonator having a resonant frequency ω

    3, an intrinsic loss rate Γ

    2, and capable of storing electromagnetic energy with a high intrinsic quality factor Q3

    3/(2Γ

    3), the third resonator located a distance from the source resonator,wherein the source resonator and at least one of the second resonator and third resonator are configured to be coupled to wirelessly transfer electromagnetic energy from said source resonator to said at least one of the second resonator and third resonator when the source resonator is coupled to the energy source, andwherein Q1>

    100 and Q2 >

    100,wherein the resonators are movable relative to one another and wherein the wireless energy transfer occurs over a range of distances, andwherein κ

    /√

    {square root over (Γ

    1Γ

    2)}>

    0.2 over the range of distances, wherein κ

    is the wireless energy transfer rate.

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