For what it's worth I ran a NEC-2 model of a differential
transmission line under these conditions:
1) free space
2) covered with a mesh shield open at each end
3) covered with a mesh shield closed at each end
The radiation under condition 2 is the same as condition 3. The
radiation in condition 2 and condition 3 is 13dB below condition 1.
>From this I infer that closing the ends makes no difference, as several
here have stated. I can improve the model in various ways but I will
wait for more input from all of you.
NEC-2 Model:
7.0" differential line spaced 0.1"
7.5" mesh shield
Mesh shield:
Six sides
0.5" diameter
0.5" distance between "rings"
Dave Cuthbert
Micron Technology
-
2005 IEEE Symposium on Product Safety Engineering
3-4 October Schaumburg, IL
http://www.ieee-pses.org/symposium
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