Using a Binary Coding Metasurface to Achieve Polarization-Dependent Full-Duplex and Full-Polarization Receiving

Coding metasurfaces have the advantage of controlling electromagnetic waves by designing digital states of the unit elements. This digital mechanism can be conveniently integrated into electronic information systems, hence, coding metasurfaces have been studied extensively in the fields of radar and communication. However, full-duplex and full-polarization, as two critical issues of system-level applications, have rarely been addressed in the existing researches of coding metasurfaces. Here we propose a flexible method to design a binary coding metasurface that possesses the functions of polarization-dependent full-duplex and full-polarization receiving. Specifically, the designed metasurface is shared by two different feeding sources, and the two sources can independently transmit or receive orthogonally polarized waves through the designed metasurface, hence forming polarization-dependent full-duplex; on the other hand, orthogonal components of incoming waves can be received respectively by the two sources, hence forming full-polarization receiving. Both simulations and measurements have validated the functions of the designed binary coding metasurface, thus showing the potential of the presented method in radar sensing, wireless communication, and other information systems.