Measured field mapping (E-field) of the ground, perturbation, and ground-plane cloaked perturbation. The rays display the wave propagation direction, and the dashed line indicates the normal of the ground in the case of free space and that of the ground-plane cloak in the case of the transformed space. (A) Collimated beam incident on the ground plane at 14 GHz. (B) Collimated beam incident on the perturbation at 14 GHz (control). (C) Collimated beam incident on the groundplane cloaked perturbation at 14 GHz. (D) Similar to (C) but at 13 GHz. (E) Similar to (C) but at 15 GHz. (F) Similar to (C) but at 16 GHz. From reference [40]. Reprinted with permission from AAAS.