羰基铁粉/聚氨酯复合材料的微波吸收特性:零反射条件与磁粉体积浓度的关系  

Microwave absorption peculiarity of carbonyl iron powder composite: relationship between zero-reflection condition and volume concentration of magnetic powder

作　　者：王国武 谭果果 乔亮[1] 王涛[1] 李发伸[1] WANG Guo-wu;TAN Guo-guo;QIAO Liang;WANG Tao;LI Fa-shen(Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education,Lanzhou University,Lanzhou 730000,China;Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China;Key Laboratory of Magnetic Materials and Devices,Chinese Academy of Sciences,Ningbo 315201,China)

机构地区：[1]兰州大学教育部磁学与磁性材料重点实验室,甘肃兰州730000 [2]中国科学院宁波材料技术与工程研究所,浙江宁波315201 [3]中国科学院磁性材料与器件重点实验室,浙江宁波315201

出　　处：《磁性材料及器件》2022年第2期1-8,共8页Journal of Magnetic Materials and Devices

基　　金：国家自然科学基金资助项目(11574122;51731001)。

摘　　要：微波吸收材料在民用和军用平台上有着越来越广泛的应用。为了提高材料的吸波性能,需要对吸波体进行设计。设计的理想目标是使吸波体对入射的电磁波尽可能地达到零反射。对于有金属背衬的单层吸波体,提出一种用其电磁参数测量数据μ_(r)(f)和ε_(r)(f)直接求出零反射参数的方法,并用此方法研究了羰基铁粉复合材料吸波体的零反射参数随羰基铁粉体积浓度的变化。结果表明,对该羰基铁粉吸收剂,当体积浓度Vc从10%增加到35%,每一个体积浓度的样品都能够获得、且只能获得一个零反射吸收峰;随着吸收剂体积浓度的增大,零反射吸收峰的峰值频率从16.2 GHz移向1.49 GHz,所对应的吸波体厚度从1.66 mm增大到3.08 mm。Microwave absorption materials have been widely used in civil and military platforms.To improve the absorbing performance,it is necessary to design the absorber.The ideal goal of the design is to make absorbers achieve zero reflection to the incident electromagnetic wave as far as possible.For single-layer absorbers with metal backing,we present a method to directly calculate the zero reflection parameters from the measured electromagnetic parameters(μ_(r)(f),ε_(r)(f))of the materials.Furthermore,the relationship between the zero-reflection parameters and the volume concentration of the fillers was obtained by using this method in carbonyl iron composites with different volume concentration.It was found that for carbonyl iron composite with different volume concentration,each sample can only obtain a zero reflection absorption peak.With the increase of volume concentration,the frequency of zero-reflection absorption peak shifted from 16.2 GHz to 1.49 GHz,and the corresponding thickness increased from 1.66 mm to 3.08 mm.

关 键 词：羰基铁粉复合材料 吸波材料 反射损耗 零反射(完全匹配)条件 磁粉体积浓度 

分 类 号：TM2712[一般工业技术—材料科学与工程] TM25[电气工程—电工理论与新技术]