开孔电大腔高频响应敏感性及其统计分析

High Frequency Response Sensitivity of Electrically Large Enclosure with Aperture and Its Statistical Analysis Method

本文主要研究外部电磁波入射下开孔电大腔中电磁环境的高频响应敏感性及其统计分析解决方法。由于电大尺寸带来的巨大计算代价和高频响应敏感性问题,很难通过由全波分析所得到的特定条件下的场分布确定性解来评估腔内场环境的普遍规律。本文从外部激励微扰和腔体几何/物理结构微扰两个角度,对开孔金属腔的相应敏感性进行了研究,给出了不同条件下腔内的场分布图以及电场模值的概率密度函数分布。发现在高频情况下,外部激励或腔体几何/物理结构的微小变化都会导致腔内场分布的巨大变化,当其对应统计规律却较为稳定,说明用统计分析方法对电大开孔金属腔内电磁环境分析的有效性与普适性,以克服传统确定性分析方法难以避免的巨大计算代价和高频响应敏感性问题。

In this paper, the high frequency response sensitivity of the electromagnetic(EM) environment characteristics inside the electrically large enclosure with aperture under the external EM radiation and its statistical analysis method are discussed. Because of the immense computational cost due to the electrically large size and high frequency response sensitivity, it is difficult to assess the universal rule of the EM field environment inside the enclosure according to the deterministic solution of the field distribution obtained by full wave analysis under some certain conditions. The high frequency response sensitivity of the metal cavity with aperture is studied from the external incentives and cavity structure small changes in this thesis respectively. The field distribution and PDFs(Probability Distribution Function) of |E| inside the cavity are given under different conditions. Under the condition of high frequency, the small changes of external incentives or geometry/physical structure of the cavity can lead to great changes of the field distribution inside the enclosure, but its corresponding statistical rules are relatively stable. Therefore, the universality and validity of statistical method to analysis the electromagnetic environment in the electrically large enclosure is more remarkable. This method overcomes the huge computational cost and high frequency response sensitivity of traditional deterministic analysis methods.