Simulation of metallic enclosures with apertures on electrical shielding effectiveness

摘要

Electromagnetic shielding of metallic enclosures with an aperture is simulated by means of COMSOL in this paper. The effect of the polarization type, the thickness of material and material type on electrical shielding effectiveness has been investigated to give suggestions to enclosure designers to get better performance against to EMI. It is obtained that locating rectangular aperture in vertical position with respect to the direction of source results in better electrical shielding performance. Performance of an enclosure whose thickness is about a skin depth is 6dB worse than the enclosure whose thickness is in the order of five times skin depth. As expected, higher conducting materials need to be preferred rather than poor one. Silver, aluminum, cupper and chrome are in the order of better to worst.