| High-altitude nuclear electromagnetic pulse has the features of high strength,short duration,wide coverage frequency and so on.It can be coupled with the cable,the hole of Chassis,resulting in coupling current and voltage to interfere with or even damage to equipment and systems,so the topic of the high-altitude nuclear electromagnetic pulse research and protection will become more and more popular.Based on the coupling principle of nuclear electromagnetic pulse,this thesis analyzes the present situation and development trend of nuclear electromagnetic pulse at home and abroad.The CST is used to simulate the cable and the hole of shielded chassis in nuclear electromagnetic pulse environment.In this paper,we first study the self-radiation of the cable and the mutual cross talk between the cables.Secondly,by changing the type,height,load,outer conductor thickness and the incident direction and polarization direction of the incident wave,the change of the coupling current and voltage on the cable is observed by controlling the variable method.Finally on the nuclear electromagnetic pulse and shielding chassis hole coupling situation.Through the data to explain the cable,shield chassis hole and nuclear electromagnetic pulse coupling law:The coupling current of the coaxial line is the smallest;The coupling current voltage is proportional to the cable height,length,and incident angle,which is inversely proportional to the cable load,outer conductor thickness,and polarization direction;When the hole area is the same,the circular coupling energy is the smallest;The coupling energy is proportional to the area of the aperture and is inversely proportional to the thickness of the chassis;The coupling energy at different locations inside the chassis is inversely proportional to the distance from the slit.Finally,several basic measures to prevent the interference of nuclear electromagnetic pulse are as follows: reinforcement,filtering,grounding and shielding of communication system. |
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