Simulation of the EMP Coupling to Circuits inside a Shielding Box by a Wire Penetrated with an Aperture

The finite difference time domain (FDTD) method is used to simulate the electromagnetic pulse (EMP) induced interference current in circuits inside a shielding box by a wire penetrated with an aperture. Results show that penetrative wire can make the induced interference current in circuits increase greatly, the wire´s length and incidence angle of the EMP both have significant influence on the interference current. We also proposed a simple method that using a metal ferrule for suppressing the interference current´.