Dual-Control Reconfigurable Intelligent Metasurface: Design and Realization

A dual-control reconfigurable intelligent metasurface (DC-RIMS) composed of
$24\times 22$
symmetric cells in the 5G mid-band is proposed. The DC-RIMS of non-artificial-magnetic-conductor type provides a smaller phase resolution of
$60^{\mathrm{o}}$
with 2 bits under normal incidence. Angular sensitivities of the RIMS under oblique incidence are investigated. Our results show that the reflection responses at elevation angles are more sensitive than the azimuth angles, whereas the maximum phase differences are differed from each polarization. The horizontal one increases to
$220^{\mathrm{o}}$
whereas the vertical one reduces to
$150^\mathrm{o}$
as compared with overlapped
$180^{\mathrm{o}}$
under normal incidence.