Design of Broadband Polarization Conversion Metasurface for X and Ku Bands and RCS Reduction Applications
For anti-detection of high-resolution radar and electromagnetic stealth issues,a broadband reflective polarization conversion metasurface is designed for X and Ku bands,which can achieve more than 85%polarization conversion efficiency in the range of 6.5～8GHz and more than 90%polarization conversion efficiency in the range of 8～20GHz,and the relative bandwidth of polarization conversion efficiency above 85%is 101%,and the thickness of metasurface structure is less than 3.6mm.Square and triangle chessboard structures are designed based on this metasurface,the radar scattering cross section of both chessboard structures has been greatly reduced under vertical incidence of x-polarized and y-polarized electromagnetic waves compared with the same size metal.Both have polarization insensitive characteristics,in which the maximum RCS reduction of square chessboard structure reaches 22.91dB,and the average RCS reduction of square chessboard structure reaches 11.73dB.The maximum RCS reduction of triangle chessboard structure reaches 36.07dB,and the average RCS reduction of triangle chessboard structure reaches 12.29dB,playing a significant role in reducing the single station RCS and improving electromagnetic stealth performance.
polarization conversion metasurfaceRCSpolarization conversion ratioartificial magnetic conductorchessboard structures
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