基于FDM技术的填充型阶梯结构宽频吸波体
Broadband wave absorber with filled step-structured design using FDM technology
叶永盛 1刘沁锋 1贾瑞鹏 2丁迪 3焦未冬 1叶喜葱 1吴海华 1何恩义1
作者信息
- 1. 三峡大学 机械与动力学院,宜昌 443002;三峡大学 石墨增材制造技术与装备湖北省工程研究中心,宜昌 443002
- 2. 中国锻压协会,北京 102206
- 3. 中国机械总院集团江苏分院有限公司,常州 213164
- 折叠
摘要
宽带吸收是吸波体向实际应用发展亟须解决的难题.基于熔融沉积成型(FDM)技术制备吸波体壳体,以自制的石墨烯(rGO)-Fe3O4/乙基纤维素(EC)复合微球为吸波剂,研究单元结构几何参数和材料层间分布对吸波性能的影响,通过归一化处理,分析等效阻抗匹配的变化特性.研究结果表明,该吸波体具有宽带吸收、极化无关特性和大角度吸收特性:该吸波体实物测试结果实现了 2～18 GHz频段内 99%带宽(2.1～18.0 GHz)的有效吸收(反射损耗低于-10 dB),两个反射损耗峰值的测试强度依次为-21.9、-24.1 dB,与CST仿真的2～18 GHz全频段有效吸收、峰值强度-20.6 dB和-20.1 dB的模拟结果相吻合;对于横电波(TE)极化而言,当入射角度为40°时仍然能维持15 GHz的有效吸收带宽,在50°时还能保持X、Ku波段的有效吸收.吸波体表现出的吸波性能归因于其合理的等效阻抗匹配调控,与此同时,其结构中梯度参数可显著增加电磁波的反射次数,充分利用了电磁波的衍射能力.
Abstract
Broadband absorption poses a significant challenge in the development of wave absorbers for practical ap-plications.We utilized Fused Deposition Modeling(FDM)technology to fabricate the absorber shell,by employing homemade Graphene(rGO)-Fe3O4/Ethyl Cellulose Ethoce(EC)composite microspheres as the absorber material.We investigated the influence of geometric parameters of the unit structure and the inter-layer distribution of materials on the absorption performance,and analyzed the variation characteristics of equivalent impedance matching through normalization.Our findings demonstrate that the absorber exhibits broadband absorption,polarization-independent characteristics,and large-angle absorption properties.Physical testing of the absorber reveals a 99%effective absorp-tion(reflection loss less than-10 dB)bandwidth(2.1 GHz to 18.0 GHz)within the 2 GHz to 18 GHz range,with peak reflective loss intensities of-21.9 dB and-24.1 dB,respectively.These results closely align with CST simula-tions,demonstrating effective absorption and peak intensities of-20.6 dB and-20.1 dB over the entire 2 GHz to 18 GHz range.For Transverse Electric Wave(TE)polarization,the absorber maintains a 15 GHz effective absorption bandwidth at an incident angle of 40°,and effective absorption in the X and Ku bands at 50°.The absorber's perfor-mance is attributed to well-regulated equivalent impedance matching,while the gradient parameters within its structure significantly increase the number of electromagnetic wave reflections,thereby fully utilizing the diffraction capabilities of electromagnetic waves.
关键词
吸波体/石墨烯/电磁波/宽带吸收/等效阻抗匹配Key words
wave absorber/graphene/electromagnetic wave/broadband absorption/equivalent impedance matching引用本文复制引用
出版年
2025
国家科技期刊平台
NSTL
万方数据