In addressing the challenges of complex electromagnetic environments, the development of lightweight, thin, and multifunctional radar-absorbing devices is essential. This study advances previous work on composites of high-entropy dual-core shell HEOs@C and graphene (GR) by optimizing a cross-arrow gradient structure for broad-angle and wideband microwave absorption. Fabricated via FDM 3D printing, the structure benefits from the synergistic effects of HEOs@C and GR, enhancing impedance matching and promoting conduction losses and interfacial polarization due to defects and oxygen vacancies. The gradient design manipulates electromagnetic waves, inducing reflections, phase cancellation, and edge diffraction, leading to effective attenuation. Optimized for materials and cell structure, it achieves broadband absorption (5.76-18 GHz) with an effective absorption bandwidth over 9 GHz at specific incident angles, showcasing superior wide-angle performance. Further simulations of the radar cross-section (RCS) indicate that at 10 GHz frequency, the structure exhibits superior radar reflection performance, with reflection coefficients below −10 dBm² across the range from −60° to 60°. The gradient structure absorber fabricated by FDM 3D printing achieves the integration of material, structure, and function for electromagnetic microwave absorption, which will facilitate the practical application of stealth technology in industrial settings.

中文翻译：

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基于 FDM 3D 打印的高熵氧化物交叉箭头梯度吸收器，具有宏观-微观协同优化


在应对复杂电磁环境的挑战时，开发轻巧、轻薄、多功能的雷达吸收装置至关重要。本研究通过优化广角和宽带微波吸收的交叉箭头梯度结构，推进了以前关于高熵双核壳HEOs@C和石墨烯 （GR） 复合材料的研究。该结构通过 FDM 3D 打印制造，受益于 HEOs@C 和 GR 的协同效应，增强了阻抗匹配并促进了由于缺陷和氧空位而导致的传导损耗和界面极化。梯度设计操纵电磁波，感应反射、相位抵消和边缘衍射，从而实现有效的衰减。它针对材料和电池结构进行了优化，实现了宽带吸收 （5.76-18GHz），在特定入射角下有效吸收带宽超过 9GHz，展示了卓越的广角性能。对雷达散射截面 （RCS） 的进一步仿真表明，在 10GHz 频率下，该结构表现出优异的雷达反射性能，在 −60° 至 60° 范围内反射系数低于 −10dBm²。FDM 3D 打印制造的梯度结构吸收器实现了电磁微波吸收的材料、结构和功能的一体化，这将有利于隐身技术在工业环境中的实际应用。