Fig. 11

The harmonic communication system based on a space-time coding metasurface. a The programmable metasurface embedded with varactors. (from Fig. 3 of Ref. [80]). b The configuration of the communication system. (from Fig. 4 of Ref. [80]). c The measurement environment for communication test. (from Fig. 4 of Ref. [80]). Reproduced with permission from Ref. [80] under the terms of the Creative Commons CC BY license