Free space microwave focusing by a negative-index gradient lens


Journal Article

Metamaterial structures designed to have simultaneously negative permittivity and permeability are known as left-handed materials. Their complexity and our understanding of their properties have advanced rapidly to the point where direct applications are now viable. We present a radial gradient-index (GRIN) lens with an index-of-refraction ranging from -2.67(edge) to -0.97(center). Experimentally, we find the lens can produce field intensities at the focus that are greater than that of the incident plane wave. These results are obtained at 10.45 GHz and in excellent agreement with full-wave simulations. This lens is a demonstrate an newly pioneered advanced fabrication technique using conventional printed circuit board (PCB) technology which offers significant design, mechanical, and cost advantages over other microwave lens constructions.

Full Text

Duke Authors

Cited Authors

  • Driscoll, T; Basov, DN; Rye, PM; Nemat-Nasser, S; Schurig, D; Smith, DR

Published Date

  • November 21, 2006

Published In

Volume / Issue

  • 6320 /

International Standard Serial Number (ISSN)

  • 0277-786X

Digital Object Identifier (DOI)

  • 10.1117/12.680752

Citation Source

  • Scopus