Experimental Demonstration of the Incident Field Reconstruction Method for Metasurface Characterization

A simple method to characterize metasurfaces (MSs) using an incident field reconstruction (IFR) method is experimentally demonstrated in the
Ka
-band, following the theoretical analysis presented in (Tiukuvaara et al., 2022). The IFR method is based on reconstructing desired incident field profiles using a linear superposition of base field profiles, such as Gaussian beams or practical horn antenna structures. The IFR method is applied here to determine the scattered fields of an MS corresponding to a uniform plane wave (PW) excitation, and an excellent agreement with an ideal PW excitation is demonstrated here, with a significant improvement compared with conventionally used single horn antenna excitation.