Ultrawideband Metasurface Lenses Based on Off-Shifted Opposite Layers

Oscar Quevedo-Teruel, Mahsa Ebrahimpouri, Mou-Kehn Ng

Research output: Contribution to journalArticlepeer-review

105 Scopus citations

Abstract

Metasurfaces have demonstrated to be a low-cost solution for the development of directive antennas at high frequency. One of the opportunities of metasurfaces is the possibility to produce planar lenses. However, these lenses usually present a narrow band of operation. This limitation on bandwidth is more restrictive when the required range of refractive index is high. Here, we present a novel implementation of metasurfaces with low dispersion that can be employed for the design of ultrawideband planar lenses. The implementation consists of two mirrored metasurfaces that are displaced exactly a half unit cell. This displacement produces two effects: It increases the equivalent refractive index of the fundamental mode and flattens its frequency dependence.

Original languageEnglish
Article number7302006
Pages (from-to)484-487
Number of pages4
JournalIEEE Antennas and Wireless Propagation Letters
Volume15
DOIs
StatePublished - 1 Dec 2016

Keywords

  • Luneburg lens
  • metasurfaces
  • parallel-plate waveguide
  • ultrawideband lens

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