Radially polarized annular-slot leaky-wave antenna for three-dimensional near-field microwave focusing

Journal ar
IEEE Antennas and Wireless Propagation Letters
  • Volumen: 13
  • Fecha: 01 January 2014
  • Páginas: 583-586
  • ISSN: 15361225
  • Source Type: Journal
  • DOI: 10.1109/LAWP.2014.2311854
  • Document Type: Article
  • Publisher: Institute of Electrical and Electronics Engineers Inc.
Microwave three-dimensional near-field focusing with radial polarization using a holographic annular-slot antenna is demonstrated in this letter. This radial polarization can generate axially polarized focused fields in the near-field regime, which complements the more conventional synthesis of transversally polarized near-field focusing patterns. Moreover, it is shown that more symmetrical focal region is obtained thanks to the radial polarization for similar Fresnel number N and operation frequency. The theory is demonstrated with experiments for a design operating at 10 GHz, with aperture diameter D=6¿ and a Fresnel number N=4. © 2002-2011 IEEE.

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