Cavity-backed metasurface antennas and their application to frequency diversity imaging

Daniel Marks, Okan Yurduseven, David Smith

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Frequency diversity antennas with spatially structured radiation patterns reduce the reliance on actively switched elements for beamforming which become increasingly expensive and impractical as frequency increases. As the quality factor 푄 of a frequency diverse antenna increases, the antenna samples more spatial structure as the number of unique radiated coded spatial patterns correspondingly increases. Antennas that combine hollow cavities and metamaterial apertures achieve both large fractional bandwidth, in excess of 40%, and a high 푄 of 1600, so that each antenna radiates over 640 unique coded patterns. As compared to switched active antennas, such a passive antenna replaces the 50 antennas and switches that would produce at most (50/2)2=625 unique patterns. Furthermore, the engineered metamaterial apertures enable a radiation efficiency exceeding 60% to be achieved in a single desired polarization. The theory of cavity-backed metasurface antennas is explained, and frequency diverse imaging is demonstrated with a pair of these antennas.
Original languageEnglish
JournalJournal of Optical Society of America A
Volume34
Issue number4
DOIs
Publication statusPublished - 08 Mar 2017

Keywords

  • Imaging techniques
  • Electromagnetic Optics
  • Metasurfaces
  • Antenna

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