Fig. 3: The illustration of two schemes for the spatial self-adaptive principle.
From: Smart metasurface with self-adaptively reprogrammable functions
a The illustration for Scheme A: beam steering. b The situations where the metasurface rotates by different elevation angles (φ), namely, 20°, 40°, and 60°, in which the azimuth angle is fixed at 270°. c The situations where the metasurface rotates by different azimuth angles (θ), namely, 200°, 220°, and 240°, in which the elevation angle is fixed at 60°. d The situations for multibeam modulation. When the metasurface rotates, one beam stares at 0°, and the other beam rotates with respect to the metasurface from 0° to 60°
