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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.
Based on the theory of electromagnetic field, an equivalent electromagnetic parameter model of modified absorbent was established, and the influence of the relative volume fraction of the outer and inner layers of the magnetic absorbent on the loss performance and characteristic impedance was obtained preliminarily. Based on this, the structural design of the modified absorbent was carried out. The modified absorbent was prepared by sol-gel method. The electromagnetic parameters of the samples were experimentally tested and compared with the theoretical predictions. It shows that the spectral characteristics of electromagnetic parameters predicted by theory are close to the actual test results.