Generally, most of the electronic equipments need a metallic enclosure in
order to mechanically protect and electrically shield the interior printed
circuit boards (PCBs) and subsystems. But in practical situations, the
apertures or slots of various forms are essential parts of the shielding
enclosure for thermal dissipation, CD-ROMs, connectors, I/O cabling and so
on. The performance of shielding enclosures for high-speed digital systems
is compromised by these inevitable discontinuities on enclosure. To minimize
the electromagnetic interferences and susceptibility risks by these
discontinuities, the shielding enclosures with apertures should be designed
based on thorough analysis about the electromagnetic coupling mechanism
through apertures. In this paper, the effect of apertures and oblique
incident plane wave on shielding effectiveness of the enclosure is studied
with the Circuital Approach, and the Finite-Difference Time-Domain (FDTD)
method, the simulated SE data are verified by experimental technique. Good
agreements are found between these approaches.
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