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<p>A broadband metasurface with low radar cross section (RCS) based on a hybrid diffusion–absorption mechanism is proposed in this paper. The proposed metasurface adopts a two-layer configuration. The top layer consists of a resistive frequency selective surface (RFSS), which absorbs electromagnetic energy through ohmic loss. The bottom layer comprises metallic elements with a tunable Pancharatnam–Berry geometric phase. By rotating these elements, the phase of the reflected waves can be modulated to achieve diffuse scattering. Both simulation and experimental results demonstrate that the proposed metasurface achieves over 10 dB RCS reduction across a wide frequency range from 9.4&#xa0;GHz to 38.6&#xa0;GHz. The corresponding relative bandwidth reaches 121.5%. Moreover, the metasurface maintains stable performance under incident angles from 0° to 60°. This design provides an effective solution for wideband and wide-angle stealth metasurfaces and demonstrates potential applications in radar stealth and electromagnetic compatibility.</p>

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An ultra-wideband metasurface with low radar cross section based on combined diffusion and absorption mechanisms

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Xianjun Sheng,
  • Shufang Lin,
  • Ning Liu,
  • Bowen Wang

摘要

A broadband metasurface with low radar cross section (RCS) based on a hybrid diffusion–absorption mechanism is proposed in this paper. The proposed metasurface adopts a two-layer configuration. The top layer consists of a resistive frequency selective surface (RFSS), which absorbs electromagnetic energy through ohmic loss. The bottom layer comprises metallic elements with a tunable Pancharatnam–Berry geometric phase. By rotating these elements, the phase of the reflected waves can be modulated to achieve diffuse scattering. Both simulation and experimental results demonstrate that the proposed metasurface achieves over 10 dB RCS reduction across a wide frequency range from 9.4 GHz to 38.6 GHz. The corresponding relative bandwidth reaches 121.5%. Moreover, the metasurface maintains stable performance under incident angles from 0° to 60°. This design provides an effective solution for wideband and wide-angle stealth metasurfaces and demonstrates potential applications in radar stealth and electromagnetic compatibility.