An Experimental Concentric Near-Field Plate

  title={An Experimental Concentric Near-Field Plate},
  author={Mohammadreza F. Imani and Anthony Grbic},
  journal={IEEE Transactions on Microwave Theory and Techniques},
We present a concentrically corrugated near-field plate that can form a subwavelength near-field focal spot. The experimental plate consists of a coaxial aperture surrounded by nonperiodic concentric corrugations. The measured subwavelength patterns are shown to be significantly narrower than those created by a coaxial probe (without corrugations) of similar dimensions. Close agreement between simulated and measurement results is observed. Further, the subwavelength beam emitted by the… CONTINUE READING
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