Terahertz Broadband RCS Reduction Based on Polarization Conversion Metasurfaces

Polarization conversion metasurfaces enhance stealth capabilities by changing the polarization state of electromagnetic waves and reducing the radar echo signal of the target. Firstly, this paper designs a polarization-conversion metasurface basic unit suitable for the terahertz band; Secondly, the cross-sectional area of broadband radar is reduced through different array layouts. The results show that the polarization conversion efficiency of the metasurface element exceeds 0.9 when electromagnetic waves are vertically incident within the frequency range of 0.817-1.703THz. Under the incident Angle of 0° to 40°, the polarization conversion efficiency exceeds 0.8 in multiple frequency bands. The radar cross section of different metasurface arrays are significantly reduced when electromagnetic waves are vertically incident.