不同极化方向电磁脉冲作用于计算机机箱的效应分析

利用时域有限差分法(FDTD)分析了电磁脉冲对计算机机箱的耦合规律。讨论了不同极化方向的线极化电磁脉冲在正向时对计算机机箱的耦合规律和上方斜入射时对计算机机箱的耦合规律。研究表明:耦入计算机机箱的功率密度主要来自于机箱正面的窄缝;上方斜入射较正面入射时,耦入波向机箱下部传播,使得机箱中部功率增大;对于耦合进机箱的功率密度,垂直极化比平行极化入射时大得多。

Numerical Analysis for EMP Having Different Polarization Direction Coupling to a Computer Case

The finite-difference time-domain method is used to study the coupling of the electromagnetic pulse to the computer case through slots or holes on it.EMP with different incident directions and different polarization direction coupled into computer case is discussed respectively.Some conclusions can be obtained from simulation:(1) The energy coupled into the computer case mainly comes from the slots on cabinet's front panel;(2) The EM wave can more easily transmit down inside the computer case and energy is much more in the middle of it when EMP is oblique incidence down from above of the computer case's front panel compared with perpendicular incidence to the front panel;(3) The coupled energy when EMP's polarization direction is perpendicular to the slots is much more than that when it is parallel to the slots.