Protection of Computer Enclosure against Coupled Electromagnetic Interference
Keywords:
Electromagnetic interference (EMI), finitedifference time-domain (FDTD), shielding effectiveness (SE)Abstract
In this paper some suggested protection methods is proposed to improve the shielding effectiveness of computer enclosures. Slots and holes on the computer enclosure are divided into five types, and the coupled electromagnetic interference (EMI) into the enclosure is computed using the finite-difference time-domain (FDTD) method when each type slot exists. From comparison of both time domain electric field waveform and field distribution in the enclosure, vent array, joint laps, CD-ROM and display are found to be the main ways that the EMI penetrated into the enclosure. To improve the protection of the enclosure, waveguide window is used to replace vent array. Additionally, rivet number is increased, depth of the joint laps is increased and conductive gaskets are filled into the joint laps. From numerical analyses, it can be demonstrated that the suggested methods are efficient to improve shielding effectiveness of the computer enclosure. Some suggested methods are also proposed for the CD-ROM and display protection.
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References
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