摘要
简单有效的材料设计方法是最大程度发挥吸收剂吸波性能的关键。本研究提出了一种将匹配频率分别位于高、中、低频的三种高性能磁性吸波材料进行梯度叠层的设计方法。研究结果表明:利用此设计原理对球形羰基铁粉、片状羰基铁粉和片状FeSiAl合金三种吸收剂进行精确的阻抗渐变设计,充分发挥它们分别对高、中、低频电磁波的高效吸收,从而有效地拓宽了吸收带宽。设计总厚度分别为2.4和1.0mm时,反射损耗-8dB和-4dB以下带宽分别达到2-18GHz和2.2-18GHz,超过现有文献报道的吸波带宽。因此,这种多匹配频率材料阻抗梯度叠层的多层吸波材料设计策略不仅对于提高薄层吸波材料的带宽具有显著效果,而且对于宽带薄层吸波材料的研发具有指导意义。
To create a method for simple and effective material design is the key to maximize the performance of the absorbent.A design strategy for broadband absorbers was proposed,in which three gradient stacking magnetic absorbing layers matching high,medium and low frequencies,respectively.Three kind of spherical carbonyl iron,flaky carbonyl iron and flake FeSiAl alloy powders were precisely integrated based on the impedance grading design.They can absorb high,medium and low frequency microwaves efficiently at the same time to realize broadband absorption.By using of the proposed method,two kinds of broadband absorbers with superior bandwidth to thickness ratio have been designed and fabricated.One exhibits reflection loss of-8 dB in 2-18 GHz with a total thickness of 2.4 mm.The other shows reflection loss of-4 dB in2.2-18 GHz with a total thickness of 1.0 mm.Mechanism investigation suggests that the multi-layered absorber achieves broadband absorption by damping the high,medium and low frequency electromagnetic waves in different layers with divergent matching frequencies.The design strategy has great effect and guiding significance for designing broadband thin-layer absorbers.
作者
许志远
李维
马国庆
陈志宏
官建国
XU Zhiyuan;LI Wei;MA Guoqing;CHEN Zhihong;GUAN Jianguo(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China)
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2021年第2期199-204,共6页
Journal of Materials Science and Engineering
基金
国家自然科学基金资助项目(51577138)。
关键词
匹配频率
多层吸波材料
宽带吸收
阻抗渐变
Matching frequency
Multi-layer absorber
Broadband absorption
Impedance gradient
