矩形金属机壳孔缝电磁耦合特性研究  

Prediction for the electromagnetic coupling characteristics of a metallic enclosure with apertures

作　　者：吴刚[1] 孙靖虎[1] 李兵[1] 张晓阳[1] 

机构地区：[1]中国空间技术研究院西安分院,西安710100

出　　处：《电波科学学报》2015年第6期1222-1227,共6页Chinese Journal of Radio Science

摘　　要：针对矩形金属机壳上孔缝在高功率电磁环境下的电磁耦合问题,提出了一种使用模式匹配法和基于矩量法求解的混合位积分方程来分析孔缝电磁耦合特性的全波混合算法.该算法考虑了高次模、孔缝形状、孔缝厚度以及入射波极化方向等因素对电磁耦合特性的影响.通过将数值仿真结果与经典孔缝电磁耦合模型的测试结果进行对比,验证了该算法具有较高的准确性,与经典的时域有限差分法相比,该算法具有很高的计算效率.研究结果表明:有孔金属机壳在外界强电磁辐射条件下具有明显的谐振效应,在谐振频率点,耦合进入机壳的电场将大大增强,且孔缝附近以及机壳中心的耦合电场峰值要高于其他位置的耦合电场峰值;随着机壳表面上孔缝厚度的增加,耦合进入其内部的电场也在减弱;当机壳上的孔缝为矩形且入射波的电场极化方向平行于矩形缝隙的短边时,对应于该极化方向的孔缝电场耦合强度是所有极化方向中最强的.Aiming at prediction for the electromagnetic coupling characteristics of a metallic enclosure with a rectangular aperture, this paper proposes a hybrid approach which applies the mode-matching technique and the mixed potential integral equation based on the method of moments. The effects of high-order modes, aperture shape, aperture thickness, and polarization direction of incident wave are all considered in the simulation. The simulation results are compared with data obtained by measurement and finite-difference time-domain method to validate the accuracy and the efficiency of the proposed approach. The research shows that there is an obvious resonance when electromagnetic waves penetrating the metallic enclosure with a rectangular aperture; the coupling electric fields around the aperture and center of the enclosure are enhanced at the resonant frequency; with the thickness of the apertures growing, the coupling electric fields weaken; when the polarized direction of the incident wave is parallel to the short side of the rectangular aperture, the coupled electric fields attain the maximum. Copyright © 2015 by Editorial Department of Chinese Journal of Radio Science

关 键 词：高功率微波 电磁耦合 数值计算 金属机壳 矩形孔缝 

分 类 号：TN03[电子电信—物理电子学]