Figure 3.

Performance of the wide-angle flat lens. (a) Perspective and zoom view of the wide-angle flat lens. (b) Simulated light intensity distributed on the $xoz$ plane at 19 GHz electric field distributions. (c) Ray trajectories of 19 GHz before and after propagating through the flat lens. Left, middle, and right panels of (b) and (c), respectively, represent the cases of $\varnothing$ = $0^{°}$, ${30}^{°}$, ${60}^{°}.$ (Reproduced from [28] with permission.)