Transient study of slots or apertures in PC main frame applying FDTD

The paper presents electromagnetic coupling of transient plane wave penetrating through slots or apertures perforated in one side of a shielded PC main frame. Several slots, simulating softdisc, CD-ROM, zip-disc and air vent, have been developed in one or more sides of the main frame. FDTD numerical method is applied to the studied model. Time-domain outputs are converted to frequency-domain responses using a FFT program for easy visualisation. Both time-domain and frequency-domain results are presented and discussed. The achieved results will be applicable to practical shielding enclosure design and electromagnetic interference protection.