研究目的
To design a wideband, polarization insensitive radar cross section (RCS) reduction metasurface by combining phase gradient metasurfaces and chessboard structure.
研究成果
The proposed metasurface achieves over 10 dB RCS reduction from 8.5 to 13 GHz, with polarization insensitivity and wide-angle stability. It offers a simpler design compared to traditional methods, making it suitable for stealth applications. Future work could involve optimization for broader bandwidths or other frequency ranges.
研究不足
The study focuses on X-band frequencies (8-14 GHz) and may not be directly applicable to other frequency bands. Fabrication tolerances and measurement uncertainties could cause discrepancies. Bistatic RCS measurements were not fully conducted due to test deficiencies.
1：Experimental Design and Method Selection:
The study uses a combination of phase gradient metasurfaces (PGM) and chessboard structure to achieve RCS reduction. The design is based on the generalized Snell's Law for beam deflection and anisotropic unit cells. Full-wave electromagnetic simulations are performed using Ansoft HFSS software.
2：Sample Selection and Data Sources:
The metasurface unit is a noncentral symmetry hexagon patch with semi-circular slots. Samples are fabricated and measured, including meta-atoms with specific radii and the full metasurface.
3：List of Experimental Equipment and Materials:
F4BME substrate with relative permittivity of 2.2 and thickness of 1.5 mm, metallic plate with electric conductivity of 5.8 × 10^7 S/m, horn antennas (1-18 GHz bandwidth), Agilent N5245A vector network analyzer.
4：2 and thickness of 5 mm, metallic plate with electric conductivity of 8 × 10^7 S/m, horn antennas (1-18 GHz bandwidth), Agilent N5245A vector network analyzer.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Design and optimize the metasurface unit using HFSS. Fabricate the metasurface. Measure reflection phase and RCS in an anechoic chamber using time domain threshold method to suppress multipath reflection.
5：Data Analysis Methods:
Compare simulated and measured results for reflection phase and RCS reduction. Analyze monostatic and bistatic RCS performance.
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