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Disclosed is a method for decreasing electromagnetic leakage through enclosure seams. Benefits include improved design environment, improved productivity, and improved reliability.
English (United States)
This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately
51% of the total text.
Method for decreasing electromagnetic leakage through
Disclosed is a method for decreasing electromagnetic leakage
through enclosure seams. Benefits include improved design environment, improved
productivity, and improved reliability.
and chipset operating frequencies continue to increase. To cost-effectively
meet the increasing electromagnetic interference (EMI) requirements, advances
in EMI containment are required. Enclosure slots and apertures must decrease to
keep pace with the smaller wavelengths (higher frequencies). For example, a
slot that is 2 inches in length may attenuate frequencies at or below 100 MHz
very effectively. However, for frequencies in the GHz range, this slot offers
very little EMI attenuation, especially at its resonant frequency. In a
shielded enclosure, the shielding effectiveness of the slot decreases as
frequencies increase. These slots (seams) are common in enclosures in which
metal panels connect. However, to provide good EMI containment for high
frequencies, conductive gaskets are often used. These gaskets work well, but are expensive, require extra
assembly costs (more than $1 per foot), and can adversely affect product
quality when misaligned or bent.
U-seam is a method of attaching two sheet metal edges together so that one edge
bends tightly around the other (see Figure 1). This tight U-shaped bend traps
EMI inside the enclosure. Its performance is governed by the geometry of the
seam including the...