雷达波吸收剂的包覆改性设计

Designing the microstructure of the coated radar absorbent

从电磁场理论出发,建立了包覆改性吸收剂等效电磁参数模型,初步得到了磁性吸收剂经介电改性后外包覆层和内层材料相对体积分数对损耗性能和特性阻抗的影响规律;以此为基础,进行了包覆改性吸收剂的结构设计;采用溶胶-凝胶法制备了包覆改性吸收剂,实验测试了样品的电磁参数,同理论预测结果进行了比较,表明理论预测的电磁参数频谱特性同实际测试结果比较接近.

The model for the effective electromagnetic coefficients is established. The influence of the volume ratio of the outer layer and the inner on the absorption and the characteristic impedance is discussed. The microstructure of the coated absorbent is designed. Sol-gel method is used to prepare the coated radar absorbent. It is shown by the theoretical and experimental results that the absorbing ability of the coated magnetic absorbent has be improved greatly, and the absorbing band below - 8 dB is about 9 GHz.