Browsing by Author "Ebrahimpouri, Mahsa"

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Ultrawideband Metasurface Lenses Based on Off-Shifted Opposite Layers
(2016)
Quevedo-Teruel, Oscar
;
Ebrahimpouri, Mahsa
;
Kehn, Malcolm Ng Mou
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
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 ultrawide-band 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.