Analysis of Shielding Effectiveness of Multi-layer Steel Cages under High-Altitude Nuclear Explosion

In view of the strong electromagnetic pulse environment of high-altitude nuclear explosions, the shielding effective-ness of different structural steel cage in protection engineering is studied, which provides an effective reference for the normal operation of electronic equipment. The MoM method is used to perform coupling calculations on eight different structures of steel cages. The influence of two parameters that the number of layers and the size of the square holes on the shielding effectiveness is analyzed. And a preliminary assessment was conducted from the amount of steel bars about the two factors. The results show that increasing the number of layers of the steel cage can more effectively prevent the coupling of high-altitude nuclear explosive electromagnetic pulses into the steel cage than reducing the size of the metal mesh, but it led to more steel consumption.