基于FDTD的孔缝金属箱屏蔽效能分析

Analysis of shielding effect of metallic box with apertures using FDTD

为了分析与解决复杂平台上的天线与其周围指挥舱等金属结构之间的电磁干扰问题,以期将天线对指挥舱内的电子设备的干扰降到最小。应用时域有限差分算法计算了2根振子天线辐射下带孔缝金属箱子的屏蔽效能。通过计算金属箱内部一点的电场强度和频谱特性,研究了形状不同、尺寸不同、面积相同和数目不同等窗口状态对带孔缝金属箱的屏蔽效能的影响,得出了提高带孔缝金属箱的屏蔽效能的一些方法手段。能有效解决工作于车、船和飞机等复杂电磁环境的天线干扰其周围指挥舱等金属结构内电子设备的电磁问题。

In order to analyze and solve the EMI （electromagnetic interference） between the antennas on the completed combat platform and the metallic structures such as the commanding modules around, and to reduce the EMI from the antennas to the electronic equipment in the modules, FDTD was employed to compute the SE of the metallic box with apertures under the radiation of the antennas. The electric field strength inside the box was computed, the conclusion of the influence from the apertures, which have same area but different shapes, dimensions and numbers, to the SE of the metallic box was studied, and some means for advancing the SE of the metallic box with apertures were found. This work is important to analyze and solve the EMI between the antennas on the completed combat platform and the metallic struc- tures such as commanding modules around.