基于双几何相位超表面的三频全空间波前调控OA北大核心CSTPCD

To solve the problem of multi-channel cross-talk in full-space metasurface,a strategy of tri-band transmis-sion-reflection-transmission full-space wavefront control based on dual-geometric-phase metasurface is proposed.A fre-quency selective surface was cascaded with multilayer metasurface to obtain independent modulation of three frequency bands.The full-space independent amplitude and phase control combining transmission and reflection was realized based on dual geometric phase theory.For verification,a full-space multifunctional metadevice working at C,X and Ku bands was designed,fabricated and measured.Both numerical and experimental results show that transmissive and reflective du-al-vortex beams along y-axis and x-axis are generated at 7 GHz and 10.2 GHz,respectively,meanwhile dual foci along x-axis is generated at 15.7 GHz under left-handed circularly-polarized wave excitation.The proposed strategy of tri-band transmission-reflection-transmission full-space wavefront control provides new approaches for new multifunctional devices and integrated electromagnetic wave control,and expands the application prospect of metasurface in large-capacity commu-nication.