Optically Transparent Low Scattering Metasurface Based on Polarization Conversion-Diffusion-Absorption Integration Mechanism

In this paper, an optically transparent low-scattering metasurface combining polarization conversion, diffusion, and absorption mechanisms is proposed. Firstly, a polarization conversion absorbing meta-atom is designed, and its reflection coefficient is optimized based on equivalent circuit theory and genetic algorithm. Then, by arranging the meta-atom and its orthogonal structural meta-atom according to the random coding sequence, the metasurface is constructed, realizing the design concept of co-polarization absorption and cross-polarization diffusion. The simulation results are in good agreement with the measured results and the Radar Cross Section (RCS) reduction of more than -10 and -25 dB can be realized in the co-polarized and cross-polarized directions in 3.3-12.3 GHz, respectively. Moreover, the amplitude and bandwidth of RCS reduction of the metasurface can be maintained well in the 0-40 degrees oblique incidence range.

Automated summary

An optically transparent low-scattering metasurface combining polarization conversion, diffusion, and absorption mechanisms is proposed in this paper. By optimizing the reflection coefficient of a polarization conversion absorbing meta-atom and arranging the meta-atom and its orthogonal structural meta-atom according to a random coding sequence, the design concept of co-polarization absorption and cross-polarization diffusion is realized. The simulation results show good agreement with the measured results, demonstrating significant reduction in Radar Cross Section (RCS) in both the co-polarized and cross-polarized directions.