Wideband RCS Reduction Metasurface Based on Printing Resistive Graphene Ink

This letter presents a novel approach to constructing 1-bit coding unit cells for metasurface design and utilizes a genetic algorithm to effectively reduce the radar cross section (RCS) of the antenna over a wide frequency range. Unlike previousmethods, this approach allows formanipulation of the coding state of unit cells by modifying the sheet impedance of resistive graphene rather than altering conventional metallic structures. The 1-bit coding units "0" and "1" can be achieved by utilizing graphene Rs values of 10 and 1000 Omega/sq, respectively, resulting in a reflection response with a phase difference of pi and relatively large amplitude. The measurement results were compared with full-wave simulation ones to benchmark the performance of the proposed antenna. The antenna achieves more than 10 dB RCS reduction band from 12.5 to 27.7 GHz with a fractional bandwidth of 75.6%. The proposed design exhibits promising potential applications in stealth technology for intricate entities.