Broadband Optimization of Perfect Anomalous Reflective Metasurfaces for Beyond 5G Wireless Communications

We demonstrate broadband optimizations of the anomalous reflective metasurfaces numerically. Anomalous reflective metasurfaces with the target reflection angles of
$\theta_{r}=4.5$
, 60 and 75 deg for the incident angle of
$\theta_{r} =0\deg$
are designed at the 60 GHz band and broadband operations with the relative bandwidth improvements with the ratio from 181 % up to 205 % are shown with small efficiency deteriorations at most 92.9 % among the designs.