  The ability of passive flat patterned electromagnetic skins (EMSs) to
overcome the asymptotic limit of the total path attenuation (TPA) of flat
metallic reflectors of arbitrary size in non-line-of-sight (NLOS) specular
wireless links is assessed. Closed-form expressions for the achievable TPA in
EMS-powered NLOS links as well as the condition on the panel size of
EMS-screens to improve the performance of flat passive conductive screens
(PCSs) with the same aperture are derived and numerically validated by
considering different incidence angles, screen apertures, transmitter/receiver
distances, antenna gains, meta-atom geometries, and carrier frequencies.
