for thermal design and assembly reason, there inevitably exist thermal aperture arrays and slots on computer enclosure, so electromagnetic pulse will get into enclosure through these apertures, which is called “back-door coupling”. This paper simulates and computes the computer enclosure''s apertures coupling effects caused by electromagnetic pulse by using Transmission Line Matrix Method (TLM). Change and distribution plots with time of the coupling electric field are analyzed. The influence of propagation direction and polarization direction on the coupling electric field in enclosure is discussed, and the strongest and weakest coupling approach is given in the paper. All of these apply quantified basis for studying electromagnetic protection and electromagnetic compatibility of computer.
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