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<p>The metamaterials offer methodology and infinite possibilities for ultra-broadband microwave absorption (MA). However, maintaining stable broadband MA under extreme high-temperature environments remains one of the most cutting-edge challenges. Herein, we report a RuO<sub>2</sub>/glass resistive material for the fabrication of microwave-absorbing metasurfaces. Based on tunneling effect, an ultra-low temperature coefficient of resistance was achieved in RuO<sub>2</sub>/glass, resulting in temperature-insensitivity of its electrical properties, thereby ensuring stability of MA properties of metasurfaces against temperature. Furthermore, using low-dielectric alumina aerogel composites and Al<sub>2</sub>O<sub>3f</sub>/Al<sub>2</sub>O<sub>3</sub> ceramic composites as dielectric spacer layer, we propose the multifunctional composites integrated with MA, thermal insulation and load-bearing (MTL). The MTL integrated composites show an impressive broadband (2~12 GHz) MA performance that is ultra-robust against temperature variations (25~1000 °C), thermal shock (50 cycles at 25~1000 °C), incidence angle (±45°) and polarization. Additionally, the integrated composites also demonstrate a long-term thermal insulation ability and a high compressive modulus (6.58 MPa). This advancement provides insights for developing MA materials that can work in extreme multi-field environments.</p>

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Metasurface-based multifunctional composites with ultra-robust broadband microwave absorption up to 1000 °C

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月25日

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  • Xinyuan Lv,
  • Qiujin Gu,
  • Shengchi Zhu,
  • Xun Sun,
  • Minglong Yang,
  • Tao Liu,
  • Yunpeng Ma,
  • Zhenxin Cao,
  • Haitao Liu

摘要

The metamaterials offer methodology and infinite possibilities for ultra-broadband microwave absorption (MA). However, maintaining stable broadband MA under extreme high-temperature environments remains one of the most cutting-edge challenges. Herein, we report a RuO2/glass resistive material for the fabrication of microwave-absorbing metasurfaces. Based on tunneling effect, an ultra-low temperature coefficient of resistance was achieved in RuO2/glass, resulting in temperature-insensitivity of its electrical properties, thereby ensuring stability of MA properties of metasurfaces against temperature. Furthermore, using low-dielectric alumina aerogel composites and Al2O3f/Al2O3 ceramic composites as dielectric spacer layer, we propose the multifunctional composites integrated with MA, thermal insulation and load-bearing (MTL). The MTL integrated composites show an impressive broadband (2~12 GHz) MA performance that is ultra-robust against temperature variations (25~1000 °C), thermal shock (50 cycles at 25~1000 °C), incidence angle (±45°) and polarization. Additionally, the integrated composites also demonstrate a long-term thermal insulation ability and a high compressive modulus (6.58 MPa). This advancement provides insights for developing MA materials that can work in extreme multi-field environments.