Space-Time-Coding Digital Metasurfaces: Principles and Applications
Joint multifrequency beam shaping and steering. Reproduced from . (a) Conceptual illustration of multifrequency joint syntheses via an STC digital metasurface. (b) Schematics of intertwined coding subsequences. As denoted by the color coding, each subsequence only has an effect on one specific harmonic. (c) The synthesized phase patterns for the complex-valued equivalent amplitude at the first four frequencies. (d) The corresponding numerically calculated 2D scattering patterns.