有耗媒质表面阻抗的计算及应用

CALCULATIONS AND APPLICATIONS FOR SURFACE IMPEDANCE OF LOSSY MEDIUM

给出了在不满足阻抗边界条件所需的几个条件下有耗媒质表面阻抗的分析和计算方法。文章采用传输线理论考虑了复折射角,给出了平面多层有耗媒质表面阻抗的具体计算表达式。对于圆柱多层材料表面阻抗的计算进行了讨论,提出了模式表面阻抗及平均表面阻抗的概念。文章还给出了应用实例。数值计算及实验表明,用本文的方法计算的表面阻抗而求出的具有开槽的表面阻抗加载的二维柱劈融合体的RCS与实验结果基本一致。

Surface impedances of lossy mediums, which do not meet the requirements for impedance boundary conditions (IBC), are analyzed in this paper. The expressions of surface impedance for both plane and cylindrical multilayers are given. The mode and average surface impedances are suggested. An example of application is also given to show the validity of the methods in this paper. The calculated results of RCS are in good agreement with the experimental data for the object composed of wedge and cylinder, which is loaded with slotted surface impedance.