接收模式下加罩天线系统特性的快速电磁仿真

Fast electromagnetic simulation of characteristics of radome-antenna system in receiving mode

针对接收模式下电大尺寸的天线-天线罩系统电磁特性分析问题,提出了一种全波法和高频法结合的混合算法:积分方程/修正型表面积分+多层快速多极子(IE/MSI+MLFMA)方法.该方法将由高频方法 MSI得到的天线罩内场分布作为天线阵列的激励场,再利用基于体-面混合积分方程(VSIE)和MLFMA的快速全波分析方法精确计算天线阵;同时应用球谐函数展开、预处理技术、混合并行等技术进一步改进算法的计算效率.同传统的全波数值法相比,该方法在保证计算精度、满足工程需要的前提下,解决了求解计算时间长、计算效率低的问题,实现了对电大尺寸天线-天线罩系统的快速、高效仿真.

An efficient hybrid approach, which combines the full-wave and high-frequency method, i. e. , the multilevel fast muhipole algorithm （MLFMA） based volume-surface integral equation （VSIE） and the modified surface integration （MSI） method, was proposed to analyze the electromagnetic characteristics of the electrically large radome-antenna system in receiving mode. The MSI method determined the transmitted field distributions through the radome firstly and treated the fields as the excited source of the antennas, and then the MLFMA accelerated VSIE solver was used to analyze the antennas accurately. The method employed spherical harmonic expansion, preconditioner and hybrid parallel techniques to further improve the calculation efficiency of the algorithm. This new IE/MSI ＋ MLFMA method has reasonable accuracy and dramatically reduces the computational time and improves the efficiency when compared to the conventional full-wave nu- merical methods, and produces fast and efficient simulation of electrically large antenna-radome system.