November 2004
Beginner
368 pages
19h 44m
English
Content preview from The Circuit Designer's Companion, 2nd Edition
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Electromagnetic compatibility 279
frequencies, absorption loss becomes the dominant term. Figure 8.10 shows the
combined reflection and absorption losses for 0.05mm aluminium foil (σ
r
= 0.61, µ
r
=
1) and 0.5mm sheet steel (σ
r
= 0.1, µ
r
= 60 at 10kHz dropping to 1 above 1MHz) versus
frequency.
8.5.1 Apertures
The curves in Figure 8.10 suggest that upwards of 200dB attenuation is easily
achievable using reasonable thicknesses of common materials. In fact, the practical
shielding effectiveness is limited by necessary apertures and discontinuities in the
shielding.
Apertures are needed for ventilation, for control access, and for viewing indicators.
0
50
100 ...
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