Multifunctional Metasurface Based on Cascaded Multilayer Modules

This paper proposes a novel design method for multifunctional modular metasurfaces based on cascaded multilayer modules. Strong electromagnetic coupling between cascaded modules and balanced interface impedance achieved through optimized resonator configurations enable broadband operation. By pairwise cascading of the three modules to maximize utilization and achieve maximum channel count, the system realizes comprehensive electromagnetic wavefront manipulation across 4 broadband frequency ranges, demonstrating diverse functionalities including orbital angular momentum beam generation, polarization conversion, beam splitting, and radar cross-section reduction with 7 operational channels: two reciprocal co-polarized transmission channels at 14-20.7 GHz, individual reflection channels in +<i>z</i> and -<i>z</i> spaces at 32-38 GHz, two reciprocal cross-polarized transmission channels at 11.9-13.2 GHz, and a reflection channel in -<i>z</i> space at 20-28 GHz, spanning both transmission and reflection modes. The proposed cascading method is accomplished through direct attachment assembly, avoiding air coupling while enabling rapid installation and fast functional switching, providing flexibility for multifunctional electromagnetic wave control applications.