片形FeSiAl磁粉复合材料的雷达波吸收机理  

Radar Wave Absorption Mechanism of the Flake-Shaped FeSiAl Particle Composite

作　　者：王涛[1] 位建强[1] 张钊琦[1] 李发伸[1] 

机构地区：[1]兰州大学磁学与磁性材料教育部重点实验室,甘肃兰州730000

出　　处：《中国材料进展》2013年第2期94-101,共8页Materials China

基　　金：国家重点基础研究发展计划项目(2012CB933101);国家自然科学基金项目(11144008)

摘　　要：雷达波吸收材料已广泛应用于高频电子器件的抗电磁干扰和国防武器装备的雷达波隐身涂层。高性能的雷达波吸收材料要求其中的填充剂在GHz频段具有高的磁导率和合适的介电常数。片形FeSiAl磁粉由于良好的软磁性能,且在GHz频段具有较高的磁导率和相适应的介电常数,其复合材料被广泛用于高性能的雷达波吸收体。本工作制备了不同体积分数和不同厚度的片形FeSiAl磁粉/石蜡复合物,利用矢量网络分析仪测试了复合物在0.1～18 GHz的电磁参数,利用直接探测开路和短路状态下反射系数的方法研究了雷达波在空气-吸波涂层界面、吸波涂层-金属短路板界面的反射性能及反射损耗特性。结合开路和短路状态下反射系数的测量结果和相关模拟计算,直接确定了吸收峰峰值频率和吸波体厚度的依赖关系,进一步利用界面反射模型对吸收峰强度,吸收峰宽度做了深入的原理性讨论。Radar wave absorption materials have been widely used in electron devices working in microwave frequency to avoid the electromagnetic wave interference and in military equipments to prevent the detection of radar wave. High performance radar wave absorption materials require a high permeability and appropriate permittivity in GHz range. Due to that the flake-shaped FeSiA1 powder has the superior soft magnetic properties and possesses the high permeability and appropriate permittivity in GHz range, its composite has been widely used as radar wave absorber with high performance. In this work, the flake-shaped FeSiAl/paraffin composites with various volume concentration and thickness were prepared. Their electromagnetic parameters in 0. 1 - 18 GHz were measured by VNA. Their radar wave reflection properties at the air-absorber interface and absorber-metal plate interface and the reflection loss properties were studied by measuring the SH coefficients with and without a terminated metal plate. According to the measured SH coefficients and the simulation data, the relationship between the frequency position of the reflection loss （RL） peak and the absorber thickness was confirmed directly, and furthermore, the intensity and bandwidth of the RL peak were investigated deeply from viewpoint of their origin on the base of interface reflection model.

关 键 词：雷达波吸收 片形FeSiAl磁粉 吸收峰峰值频率 吸收峰强度 吸收峰宽度 

分 类 号：O441.6[理学—电磁学]