Journal
OPTICS EXPRESS
Volume 23, Issue 7, Pages 8555-8564Publisher
Optica Publishing Group
DOI: 10.1364/OE.23.008555
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Funding
- Spanish Government under contract Consolider Engineering Metamaterials [CDS2008-00066, TEC2011-28664-C02-01]
- Spanish Ministerio de Economia y Competitividad [FPI BES-2012-054909]
- Spanish Ministerio de Educacion, Cultura y Deporte [FPU AP-2012-3796]
- Spanish Government [RYC-2011-08221]
- Imperial College Junior Research Fellowship
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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 similar to 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 similar to 0.5. 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. (C)2015 Optical Society of America
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