Effect of orientation of RF sources maintained within the enclosures on electrical shielding effectiveness performance

Abstract

The effect of single aperture metallic enclosures on electrical shielding effectiveness (ESE) has been investigated. Simulations and measurements have been obtained for comparison. The effects of orientation of transmittingantenna (source orientation) with respect to aperture length have been studied at 2.60–9 GHz as a novelty, and thisgives details of IC RF source orientation in an enclosure. In the case of square apertures on an enclosure, a higher ESEvalue is obtained with respect to a rectangular aperture. As a case study, when the aperture width of the enclosure isdecreased from 75 to 18.75 mm, the frequency bandwidth of ESE with vertical orientation becomes higher. In otherwords, while the area of the aperture is fixed, decreasing aperture width increases ESE for vertical orientation. In thenext case, ESE with vertical orientation is better at 34.37%, 71.87%, and 99.98% of the full frequency range than thehorizontal one while the ratio of aperture length/width is 1, 4, and 16, respectively. It has been found that the verticalorientation of sources with respect to aperture-length orientation is predominant for the horizontal orientation of it onESE performance.