Calculation of the thin line electromagnetic effects in a cavity

The cables in the inner of equipments will also be damaged by high power EMP, because the electromagnetic energy can couple into the inner structure through slots in the shell of equipments. The electromagnetic effects on the thin line in a cubic cavity with a rectangle slot are simulated using thin line FDTD algorithm. The little slot is divided into many thin grids, and the transitional area is divided using sub-gridding technique. The influence of different length, different directions and different location in the cavity of the thin line on electromagnetic effects is studied. Some useful results are gotten.