Overcoming the diffraction limit with a planar left-handed transmission-line lens.

@article{Grbic2004OvercomingTD,
  title={Overcoming the diffraction limit with a planar left-handed transmission-line lens.},
  author={Anthony Grbic and George V. Eleftheriades},
  journal={Physical review letters},
  year={2004},
  volume={92 11},
  pages={
          117403
        }
}
We report experimental results at 1.057 GHz that demonstrate the ability of a planar left-handed lens, with a relative refractive index of -1, to form images that overcome the diffraction limit. The left-handed lens is a planar slab consisting of a grid of printed metallic strips over a ground plane, loaded with series capacitors (C) and shunt inductors (L). The measured half-power beamwidth of the point-source image formed by the left-handed lens is 0.21 effective wavelengths, which is… 

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