Low-profile Dual-channel Coded Metasurface for Independent Phase Manipulation of Electromagnetic Waves

Electromagnetic metasurfaces offer unique advantages over traditional materials in manipulating electromagnetic waves. It is crucial to achieve wavefront control across multiple frequencies within a compact space using a single metasurface. In this regard, we propose a reflective encoding metasurface that utilizes adjustments to hexagonal metallic copper rings and copper patches. The metasurface unit is capable of independent phase control for high-frequency and low-frequency electromagnetic waves in dual channels at two distinct frequencies. To optimize the arrangement of metasurface units,we introduce a genetic algorithm that enables the reflection of incident electromagnetic waves in any direction within the half-space. Simulation results demonstrate that the proposed encoding metasurface can flexibly manipulate the beam of incident electromagnetic waves within the half-space at 6GHz and 19GHz. The proposed low-profile encoding metasurface with dual-channel independent phase control will further unlock the application potential of metasurfaces in compact space and multi-channel communication domains.