Near-field focusing with a corrugated surface

Mohammadreza F. Imani, Anthony Grbic

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


In this letter, we present a theoretical device that can produce electromagnetic near-field patterns with deep subwave-length resolution. The device consists of a single slit in a corrugated metallic surface. The surface exhibits a nonperiodic series of grooves symmetrically positioned about a waveguide-fed slit. A procedure for designing such a device is described in detail. The electromagnetic response of the corrugated surface is shown to be as theoretically predicted, producing a subwavelength focal pattern with a null-to-null beamwidth of λ/10. In addition, the effect of losses on the performance of the device is studied. Finally, it is shown that the device can be impedance-matched to its waveguide feed. Such devices will find use in noncontact sensing and near-field probing applications.

Original languageEnglish (US)
Article number4838952
Pages (from-to)421-424
Number of pages4
JournalIEEE Antennas and Wireless Propagation Letters
StatePublished - 2009
Externally publishedYes


  • Corrugated surface
  • Diffraction limit
  • Focusing
  • Metamaterials
  • Near field

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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