Figure 1.

(A) Frequency swept measurements are acquired from each combination of the 24 transmit (blue) and 72 receive (green) metasurface panels in the imaging system. The measurements probe the scene with complex radiation patterns, as shown here projected on a mannequin target at 1 m. RF radiation passes through weak dielectric materials, such as clothing, but reflects off the body, metallic objects, and high dielectrics. The frequency-diverse response of the PCB based metasurfaces, shown in (B), provide a large set of distinct radiation patterns for image reconstruction.