Fig. 6: Signal transmitter enabled by intelligent metasurfaces.
From: Progress on intelligent metasurfaces for signal relay, transmitter, and processor
a Schematic illustration of signal transmitter. b Broadband wireless communication based on the space-time-varying metasurfaces105. c Space- and frequency-multiplexing wireless communications112. d Experimental setup of the dual-channel wireless communications112. e Intelligent spatiotemporal metasurfaces113. f Index modulation113. b Reproduced with permission from ref. 105, Copyright © 2023, Qi Hu et al. c, d Reproduced with permission from ref. 112, Copyright © 2021, Springer Nature. e, f Adapted with permission from ref. 113, Copyright © 2023, Xiaoyue Zhu et al
