An ultra-thin tri-functional coding metasurface based on frequency and polarization selection

In this paper, an ultra-thin tri-functional coding metasurface based on frequency and polarization selection is proposed to achieve different functions at different polarizations and frequencies. The proposed metasurface uses a cross shape as a polarization-sensitive phase response structure in the Ku-band and a deformed H shape as a polarization-insensitive phase response structure in the Ka-band. As a proof of concept, beam splitting, radar cross section (RCS) reduction, and vortex beam generator can be realized by changing the polarization state of the incident wave at different frequencies. These three functions can be operated independently, and the theoretical calculation results, simulation results, and measurement results are in good agreement. This tri-functional coding metasurface can provide a flexible and reliable method to manipulate EM waves with different polarizations and frequencies, as well as to integrate different functions into a single planar device, providing an efficient way to realize multifunctional devices.