宽角扫描天线激励下介质体电磁特性的快速分析.PDFVIP

宽角扫描天线激励下介质体 电磁特性的快速分析 王文博 徐金平 (东南大学毫米波国家重点实验室，南京210096) wbwang@ jpxu@ 摘 要：本文提出了一种在宽角扫描天线激励下快速计算介质体电磁特性的方法。在介质区域内部建立以电通密度为未知量的体积 分方程后，推导了体积分方程矩量法(VIE-MoM)矩阵方程中电通密度展开系数与宽角相控阵天线波束扫描角的函数关系表达式。当 激励波束以不同角度扫描时，利用该表达式直接求未知系数，避免了重复的大型矩阵的填充以及求解过程。计算实例表明，采用本 文方法来获得待求解未知数所需的时间远远小于直接求解VIE-MoM 矩阵方程，大大地提高了计算效率。 关键词：体积分方程，宽角扫描，相控阵，介质体， Fast Analysis the EM Characteristic of Dielectric Objects Excited by Wide-angle Scanning Array Wang wenbo, Xu jinping (State Key Laboratory of Millimeter Waves, School of Southeast University of China, Nanjing 210096) Abstract: In this paper, a fast method is presented to obtain the electromagnetic (EM) characteristics of the dielectric objects when excited by the wide-angle scanning phased array. Regarding the electric field vector flux density as unknown, a volume integral equation in the dielectric area is formed. The related expression between the expanding coefficients generated by VIE-MoM and the scanning angle is deduced. So the unknowns can be calculated by the expression directly when the dielectric objects are excited by the array antenna in many different scanning angles. And the repeating processes of solving the large matrix equation of VIE-MoM in wide angular range are avoided as long as the VIE-MoM matrix equation is solved at limited number of sampling angular points. It can be seen from the numerical example that the time needed to calculate the unknowns by the proposed method is much less than that consumed by the approach to solve the matrix equation directly. And the computational efficiency is enhanced greatly. Keywords: Volume integral equation; wide-angle scanning; phased array; dielectric object