Figure 1.

Digital coding and programmable metasurfaces. Reproduced from [57]. (a) Schematic of the digital coding metasurface containing two types of 1-bit elements “0” and “1,” and it scattered beams under different coding patterns. (b) Geometry of 1-bit programmable elements and the corresponding reflection phases. (c) The flow chart of the 1-bit programmable metasurface under the control of an FPGA hardware. (d) Numerically simulated results of scattering patterns for the 1-bit programmable metasurface under different coding sequences.