Fig. 2: Combined selective multiline systems and associated performance.
a Extended equivalent circuit concept using additional waveform-selective metasurface lines to selectively transmit signals. Three variable transmission lines ZC, ZL, and ZP represented C-based, L-based and parallel waveform-selective metasurface lines, while Z1, Z2, and Z3 were impedances of three receivers Rx1, Rx2, and Rx3. b Monopole transmitter connected by all three types of waveform-selective metasurface lines. c (left) Simulated and (right) measured transmittances to Rx1, Rx2, and Rx3. The frequency was set to 2.36 GHz and 2.45 GHz in the simulation and measurement, respectively, while the input power was fixed at 15 dBm in both cases. d Image of a prototype with three waveform-selective metasurfaces fully extended on a 2D surface to vary radiation characteristics over the entire surface. e Corresponding measured transmittances at 2.24 GHz with 23 dBm. Note that the 2D metasurface case had a lower operating frequency due to a higher number of electronic circuits soldered to hexagonal patch sides, which introduced more parasitic elements.
