A Polarization Conversion Coding Metasurface for Broadband Radar Cross-Section Reduction

We have designed a polarization conversion coding metasurface (CM) for broadband radar cross-section reduction. The CM is made up of a kind of deformed bowtie-shaped particle and its mirror, named 0 and 1, respectively, which can realize cross-polarization conversion under the vertical incidence of a linearly polarized wave. According to the coding sequence optimized by the genetic algorithm, the two kinds of unit are arranged to form a design, called a 1-bit CM, which can scatter electromagnetic waves in various directions. The simulation results demonstrate that the two kinds of unit can achieve more than a 90% polarization conversion ratio, and the whole CM can realize more than a 10-dB reduction of monostatic radar cross-section (RCS) from 8.8 GHz to 20.9 GHz, while the maximum RCS reduction of 32.5 dB can be obtained at 14 GHz under the normal incidence ofx- andy-polarized waves. The experimental results are almost identical to the simulation. Thus, we believe that the designed 1-bit CM can be well applied for the stealth business.