Figure 4. Measured radiation pattern.

(a–d) Measured 2D normalized far-field distribution (7, 10, 12 and 14 GHz, respectively); (e) Measured gain (with and without the transformed lens) and side lobe level at the lower band of operation (with the lens). (f) Simulated directivity for the original hyperbolic lens, transformed lens and Fresnel lens³²,³³,³⁴, all of them fed with an X-band waveguide at their focal point.