Radially Polarized Annular-Slot Leaky-Wave Antenna for Three-Dimensional Near-Field Microwave Focusing

Darwin Blanco, Jose Luis Gómez-Tornero, Eva Rajo-Iglesias, Nuria Llombart Juan

Research output: Contribution to journalArticleScientificpeer-review

17 Citations (Scopus)

Abstract

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=6λ and a Fresnel number N=4.

Original languageEnglish
Article number6767070
Pages (from-to)583-586
Number of pages4
JournalIEEE Antennas and Wireless Propagation Letters
Volume13
DOIs
Publication statusPublished - 2014

Keywords

  • Focal depth
  • leaky-wave antennas
  • three-dimensional near-field focused microwave antennas

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