New developments in shielding effectiveness measurements - shielding aperture

Electromagnetic interference occurs in the electronic equipment when an external electromagnetic wave impinges on the equipment and when some of the energy conveyed by the wave is absorbed in the circuits of the equipment. The effectiveness of an enclosure should be based on the energy absorbed by a set of representative enclosure contents when the enclosure and its contents are illuminated by an incident electromagnetic wave of defined power density or field strength. In this paper, a new method of assessing the efficacy of a shielding enclosure has been described. This method is applicable to enclosures used in shielding an electronic equipment from external interference for ventilation and disk insertion. The representative contents can be tailored to replicate electronic systems used in the enclosures of different sizes and device technologies.