An anisotropic broadband coding metasurface based on ultralight graphene‐assembled film

Abstract

As theoretical research further develops, coding metasurfaces have been widely studied and applied due to their uniqueness in digital characterization and sequence arrangement. In this work, based on highly conductive graphene‐assembled film (GAF), an ultralight anisotropic broadband coding metasurface (ABCM) is proposed. The GAF ABCM consists of 16 units with specific phase responses and enables complete metal substitution. By arranging the unit cells in a specific order, the GAF ABCM realizes the functions of anomalous reflection, polarization conversion, and radar cross‐section (RCS) reduction. Results validate that the GAF ABCM has a measured 10 dB normal incidence backward RCS reduction within the working frequency band of 7–18 GHz, which fully covers the X‐band and Ku‐band for radar application. Furthermore, due to the lightweight property of GAF, the density of the GAF ABCM is only 0.06 g/cm3 (surface mass density of 0.038 g/cm2). All results indicate that the lightweight GAF metasurface is promising in radar stealth and communication fields.

Graphene Assembled Films for Radio Frequency and Microwave Technology

“…An ultralight anisotropic broadband 2-bit GAF coding metasurface is designed. 50 The anisotropic element of the GAF coding metasurface independently regulates two types of polarized electromagnetic waves (Figure 6e and f). By controlling encoding arrangement, the GAF coding metasurfaces achieve advanced function of beam modulation, linear polarization/ circular polarization conversion, anomalous reflection and electromagnetic stealth.…”

“…(e, f) Far-field radiation patterns of GAF coding metasurface with multifunction. Reproduced with permission from ref . Copyright 2023 John Wiley and Sons.…”

“…Moreover, coding metasurfaces can provide richer electromagnetic wave regulation functions. An ultralight anisotropic broadband 2-bit GAF coding metasurface is designed . The anisotropic element of the GAF coding metasurface independently regulates two types of polarized electromagnetic waves (Figure e and f).…”

Millimeter-Wave and Short-Range Wireless Communication Antenna Based on High-Conductivity Graphene-Assembled Film

“…In our previous work, highly conductive (10 6 S/m) graphene-assembled films (GAFs) were proposed and prepared, which have mechanical stability, corrosion resistance, and thermal conductivity far superior to that of metals while maintaining similar electrical properties, making high-performance millimeter-wave graphene-based film antennas possible. GAF has been successfully applied to radio-frequency devices such as antennas, filters, and metasurfaces. − Further, we are also working on developing various types of GAF 5G millimeter-wave and long-range wireless antennas. − All the GAF-based antennas show excellent corrosion resistance, environmental friendliness, and lightweight. However, the existing GAF antennas are mostly concentrated in the low-frequency band (below 30 GHz), and high-frequency millimeter-wave short-range wireless communication has not been reported.…”