Electromagnetic interference investigation of PCB in metallic enclosures using ADI-FDTD method

In this paper, transient electromagnetic analysis of rectangular metallic enclosures with apertures illuminated by electromagnetic pulse (EMP) is investigated using alternating-direction-implicit finite-difference time-domain (ADI-FDTD) method. The dispersive property of substrate of printed circuits boards (PCBs) is characterized by the Debye model. Numerical results shows that induced voltage of inner circuits are seriously affected by angle of incidence, polarization and magnitude of the EMP, and length of apertures. Based on the transient response, further design of protection can be implemented to suppress the received jitter of voltage pulses.