Dual-channel multifunctional coding metasurface with integrated focusing and four-beam vortex beams

Full-space multifunctional coding metasurface (MS) has attracted much attention. However, it is still a challenge to achieve full- space multi-functionalities within a simple metasurface structure. Herein, a multifunctional coding metasurface for dual-channel spatial multiplexing is proposed which using the shared aperture principle to independently manipulate the polarization wavefront of the metasurface in different spaces and frequencies. For incidence of linearly polarized (LP) and circularly polarized (CP) waves in two different spaces, the orientation angle and opening angle of the C-shaped structure can cover the phase shift of 0–2π . The metasurface achieves multi-channel and multifunctional features, including dual-channel vortex beams with different angles and dual-channel focusing beams. A full-space metasurface was prepared, both simulations and measurements are performed as a proof of concept and show good agreement. The multifunctional metasurface provides a new way for wavefront manipulation devices while having great potential in antenna, miniaturization, and integration of equipment in communication.