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<p>The electromagnetic wave-absorbing materials provide an efficient solution to notable electromagnetic pollution issues. However, as for the design of ultra-wideband, layered absorbing materials remain a critical challenge in the field of wave absorption. This paper first designs a series of broadband tri-layered absorbing structures using the prepared hybridized absorbers of EG-TEA@Fe<sub>3</sub>O<sub>4</sub>@GO with wrinkled morphology and MoO<sub>3</sub>@MWCNT with necklace-like morphology, as well as common dielectric and magnetic absorbers via particle swarm optimization algorithm, determining the appropriate range of electromagnetic parameters for the transmission layer (0 &lt; <i>ε</i>′ &lt; 5, 0 &lt; <i>ε</i>″ &lt; 1; 0 &lt; <i>μ</i>′ &lt; 1, 0 &lt; <i>μ</i>″ &lt; 0.5), absorption layer (5 &lt; <i>ε</i>′ &lt; 7, 1 &lt; <i>ε</i>″ &lt; 2; 1 &lt; <i>μ</i>′ &lt; 1.2, 0.5 &lt; <i>μ</i>″ &lt; 0.7) and reflection layer (<i>ε</i>′ &gt; 7, <i>ε</i>″ &gt; 2;<i> μ</i>′ &gt; 1.2,<i> μ</i>″ &gt; 0.7) in wideband absorbing materials. Based on these findings, tri-layered absorbing structure with a wider effective absorption bandwidth of 15.63&#xa0;GHz, stronger stealth capability with maximum RCS reduction of 17.9&#xa0;dB&#xa0;m<sup>2</sup> and relatively thinner thickness was constructed, which was consistent with the predicted result. The absorption mechanism of the designed tri-layered absorbing structure, dominated by dielectric loss below 4&#xa0;GHz and magnetic loss above 4&#xa0;GHz, as well as multiple reflections induced by the fabricated absorber’s unique morphologies, is analyzed through CST simulations and electromagnetic analysis. The tri-layered absorbing structures we developed demonstrate significant advantages over similar reported counterparts, indicating great potential for applications in the ultra-wideband absorption field, and providing an effective method for the fabrication of ultra-wideband absorbing materials via controlling each layer’s electromagnetic parameters to a suitable range and adjusting the unique morphology of the absorbers with high specific surface area.</p> Graphical abstract <p></p>

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Optimally designed tri-layered wave-absorbing materials with unique morphological absorbers toward ultra-wideband absorption

  • 期刊论文

  • 发表日期：

    2025年7月7日

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  • Shaojun Wu,
  • Xianglai Xu

摘要

The electromagnetic wave-absorbing materials provide an efficient solution to notable electromagnetic pollution issues. However, as for the design of ultra-wideband, layered absorbing materials remain a critical challenge in the field of wave absorption. This paper first designs a series of broadband tri-layered absorbing structures using the prepared hybridized absorbers of EG-TEA@Fe3O4@GO with wrinkled morphology and MoO3@MWCNT with necklace-like morphology, as well as common dielectric and magnetic absorbers via particle swarm optimization algorithm, determining the appropriate range of electromagnetic parameters for the transmission layer (0 < ε′ < 5, 0 < ε″ < 1; 0 < μ′ < 1, 0 < μ″ < 0.5), absorption layer (5 < ε′ < 7, 1 < ε″ < 2; 1 < μ′ < 1.2, 0.5 < μ″ < 0.7) and reflection layer (ε′ > 7, ε″ > 2; μ′ > 1.2, μ″ > 0.7) in wideband absorbing materials. Based on these findings, tri-layered absorbing structure with a wider effective absorption bandwidth of 15.63 GHz, stronger stealth capability with maximum RCS reduction of 17.9 dB m2 and relatively thinner thickness was constructed, which was consistent with the predicted result. The absorption mechanism of the designed tri-layered absorbing structure, dominated by dielectric loss below 4 GHz and magnetic loss above 4 GHz, as well as multiple reflections induced by the fabricated absorber’s unique morphologies, is analyzed through CST simulations and electromagnetic analysis. The tri-layered absorbing structures we developed demonstrate significant advantages over similar reported counterparts, indicating great potential for applications in the ultra-wideband absorption field, and providing an effective method for the fabrication of ultra-wideband absorbing materials via controlling each layer’s electromagnetic parameters to a suitable range and adjusting the unique morphology of the absorbers with high specific surface area.

Graphical abstract