Exploiting the dispersion of the double-negative-index fishnet metamaterial to create a broadband low-profile metallic lens
Fecha
2015Versión
Acceso abierto / Sarbide irekia
Tipo
Artículo / Artikulua
Versión
Versión publicada / Argitaratu den bertsioa
Impacto
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10.1364/oe.23.008555
Resumen
Metamaterial lenses with close values of permittivity and
permeability usually display low reflection losses at the expense of narrow
single frequency operation. Here, a broadband low-profile lens is designed
by exploiting the dispersion of a fishnet metamaterial together with the
zoning technique. The lens operates in a broadband regime from 54 GHz to
58 GHz, representing a fractional bandw ...
[++]
Metamaterial lenses with close values of permittivity and
permeability usually display low reflection losses at the expense of narrow
single frequency operation. Here, a broadband low-profile lens is designed
by exploiting the dispersion of a fishnet metamaterial together with the
zoning technique. The lens operates in a broadband regime from 54 GHz to
58 GHz, representing a fractional bandwidth ~7%, and outperforms Silicon
lenses between 54 and 55.5 GHz. This broadband operation is demonstrated
by a systematic analysis comprising Huygens-Fresnel analytical method,
full-wave numerical simulations and experimental measurements at
millimeter waves. For demonstrative purposes, a detailed study of the lens
operation at two frequencies is done for the most important lens parameters
(focal length, depth of focus, resolution, radiation diagram). Experimental
results demonstrate diffraction-limited ~0.5λ transverse resolution, in
agreement with analytical and numerical calculations. In a lens antenna
configuration, a directivity as high as 16.6 dBi is achieved. The different
focal lengths implemented into a single lens could be potentially used for
realizing the front end of a non-mechanical zoom millimeter-wave imaging
system. [--]
Materias
Low-profile lenses,
Fishnet metamaterials
Editor
Optical Society of America
Publicado en
Optics Express, Vol. 23, Issue 7, pp. 8555-8564 (2015)
Departamento
Universidad Pública de Navarra. Departamento de Ingeniería Eléctrica y Electrónica /
Nafarroako Unibertsitate Publikoa. Ingeniaritza Elektrikoa eta Elektronikoa Saila
Versión del editor
Entidades Financiadoras
This work was supported in part by the Spanish
Government under contract Consolider Engineering Metamaterials CDS2008-00066 and
contract TEC2011-28664-C02-01. B. O. is sponsored by Spanish Ministerio de Economía y
Competitividad under grant FPI BES-2012-054909. V.P.-P. is sponsored by Spanish
Ministerio de Educación, Cultura y Deporte under grant FPU AP-2012-3796. M. B. is
sponsored by the Spanish Government via RYC-2011-08221. M. N.-C. is supported by the
Imperial College Junior Research Fellowship.