单层平板吸波体界面反射模型的带宽理论研究

摘要

In order to optimize and guide the design of microwave absorber,this paper has introduced the interface reflection model for single⁃layer plate absorber,and deduced the relationship of internal energy flowing revealed by the model. On the basis of those,the formula for reflection absorption bandwidth calculation is deduced,and the factors that can impact the reflection absorp⁃tion bandwidth under the interface reflection model,including the absorber layer thickness,the variation ratio of 1/4 wave⁃length thickness at peak value frequency,and the appointed reflection wave energies,former interface reflection wave energy and latter in⁃terface reflection wave energy,etc,are gained. Based on the internal energy relationship and the formula for reflection absorption bandwidth calculation,three toroidal powder/paraffin mixtures are analyzed,and the results show that the calculated values are in good agreement with the experimental ones,and the deduction process of above formula is right.%　　为了优化和指导吸波体设计，介绍了单层平板吸波体界面反射模型，推导了模型所揭示的吸波体内部能量流动关系。在此基础上，导出吸波体反射吸收带宽计算公式，由界面反射模型得出影响吸收带宽的因素，包括吸波层厚度、1/4波长厚度在峰值频率处的变化率、指定的反射波能量、前界面反射波能量及后界面反射波能量等。利用推导的能量关系及带宽公式，对3个同轴样品进行分析计算，结果表明计算值与实验值吻合较好，带宽公式推导正确。