目的 通过在复合层板中嵌入多机理三维超结构,在有限厚度下实现宽频吸收。方法 在复合层板基体中加入磁性吸波剂,并沿厚度方向构造浓度梯度,进一步将三维超结构嵌入梯度磁性介质中,通过多重谐振、磁损耗、介电损耗实现电磁能量吸收,同时结合散射调控减少垂直方向反射,发挥多重机制的协同作用,提高复合层板低频与高频兼顾的吸波性能。结果 三维超结构与磁性介质产生协同损耗效应,在低频段增强局域电磁谐振效应,提高低频吸收性能,在高频段形成定向散射效应降低回波损耗,设计了8 mm厚的磁性复合层板,磁性复合层板在在1.8~18 GHz频率范围的反射损耗均低于-10 dB,有效带宽达16.2 GHz,并进行了相应的实验验证。结论 采用三维超结构内嵌设计的磁性复合层板,能够有效激发多种电磁损耗机制的协同作用,从而实现宽频吸收。
Abstract
The work aims to achieve broadband microwave absorption under limited thickness by embedding multi-mechanism three-dimensional (3D) metastructures into composite laminates. Magnetic microwave absorbents were added to the composite matrix with a concentration gradient constructed along the thickness direction. 3D metastructures were further embedded into the gradient magnetic medium to activate multiple absorption mechanisms including multi-resonance, magnetic loss and dielectric loss, while regulating scattering to reduce vertical direction reflection, thereby improving low-frequency and high-frequency broadband absorption performance of the composite laminates. The 3D metastructures and magnetic medium produced synergistic loss effects, enhancing localized electromagnetic resonance in low frequency to improve low-frequency absorption, while forming directional scattering in high frequency to reduce reflection. An 8-mm-thick magnetic composite laminate was designed, achieving reflection loss below -10 dB over 1.8-18 GHz with an effective bandwidth of 16.2 GHz. The design was further validated experimentally. Embedding 3D metastructures in magnetic composite laminates can effectively enable synergistic interactions among multiple electromagnetic loss mechanisms and enhancement of broadband absorption.
关键词
电磁超材料 /
协同损耗 /
宽频吸收 /
低频吸收
Key words
electromagnetic metamaterials /
synergistic loss /
broadband absorption /
low-frequency absorption
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