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(a) Index of refraction for a metamaterial made of an infinite number of SSHA. (Inset) Schematic representation of the unit cell with parameters: dx = 3 mm, dy = 5 mm, dz = 1.5 mm, a = 2.5 mm, and metal thickness w = 0.5 mm. (b) Fabricated zoned fishnet metamaterial lens. (c) Lens profile: Non-zoned lens profile (red solid line), curves of the successive steps corresponding to the zoning technique (gray solid lines), and thickness limit t (white dashed line). Simulation results of the spatial power distribution on the xz-plane for a homogeneous material (n = −0.25) with the designed zoned lens profiled (background).
(a) Schematic representation of the experimental set-up. Power distribution along z axis for the frequency range 50–60 GHz: (b) simulation and (c) experimental results. (d) Simulation and experimental results of the normalized power distribution along z-axis for the frequency f = 56.7 GHz.
Spatial power distribution in xz-plane: (a) simulation and (b) experimental results. (c) Simulation and experimental results of the normalized power distribution along x-axis.
Simulation and experimental results for different lens designs using fishnet metamaterial and homogeneous material along with experimental results.
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