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In this paper, the transmission line method (TLM) is applied to calculate the shielding effectiveness (SE) of a metallic enclosure with apertures. The cases of high-order modes and 2-layer shield model are considered. The resonant frequency of the enclosure with installation of PCB is predicted by the perturbation method. Conclusions are drawn that the SE can be quickly calculated by the TLM and the...
In order to evaluate the shielding effectiveness of rectangular enclosure with rectangle aperture more exactly, we take the total effects of a printed circuit board (PCB), the loss of enclosure and multimode into account. A waveguide equivalent circuit model is established, and the analytical formulation of shielding effectiveness is derived from the equivalent circuit. The result obtained by the...
Generally, most of the electronic equipments need a metallic enclosure in order to mechanically protect and to electrically shield the interior printed circuit boards and subsystems. In this paper, shielding effect of shielding structure were studied by EM simulation software based on FEM. Especially the shape and arrange of apertures were discussed. The work shows that the shielding effectiveness...
With the development of the power system, protection for the electromagnetic interference is very important. Although protective measures of electronic equipment are improved. But the chassis itself shielded by the existence of defects (such as ventilation holes), leading to the shielding performance decline. In this paper the transmission line matrix method is applied to study electromagnetic signals...
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