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Picture of the fabricated prototype and sketch of the experimental setup. (Inset) Unit cell whose parameters are , , , and .
Longitudinal dispersion diagram and index of refraction of the structure.
Transmission coefficient for one plate (dark curve) and the biconcave DNM lens (red curve).
Normalized simulated and measured power intensity distribution for the biconcave DNM lens at 54.2 GHz along principal -axis (a), and - (b) and -axis (c) at the image plane. Spatial power intensity distribution in -plane [inset panel (b)] and -plane [inset panel (c)].
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