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MINIATURIZED ANTENNAS BASED ON NEGATIVE PERMITTIVITY MATERIALS

  • US 20060022875A1
  • Filed: 07/30/2004
  • Published: 02/02/2006
  • Est. Priority Date: 07/30/2004
  • Status: Active Grant
First Claim
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1. Apparatus comprising an antenna for operation in a range of frequencies including a resonant frequency fres of the antenna associated with a vacuum wavelength λ

  • res of electromagnetic radiation, the antenna comprising;

    a) at least one resonator of the kind in which a patterned structure, or a shaped material of negative electric permittivity or magnetic permeability, has maximum spatial extent less than one-half λ

    res and is effective, at least at fres, for;

    i) supporting a resonance, and ii) coupling to an external radiation field such that the resonant scattering cross-section of the resonator is at least about 0.3λ

    res2 for at least one incident polarization and direction of electromagnetic radiation; and

    b) a transmission line coupled to the resonator such that when the resonator is driven at fres by a driving signal in the transmission line, such portion of the driving signal as reflects back into the transmission line does so with a return loss of at least 10 dB.

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