At 06:27 PM 11/5/2005, David Robbins K1TTT wrote:
>Now that's a new one on me. Loops in the walls... well if they are all
>around the room and well bonded to the spg and at all the seams I wouldn't
>think they would cause any problems... of course they may not help much
>either. With holes the size of a wall they could hardly be called a faraday
>cage, they wouldn't give much shielding from anything except maybe vlf, and
>definitely wouldn't stop lightning.
If the perimeter of the hole is < 1/2 wavelength (or so), then it will
shield fairly well. The real challenge for building a shielded room would
not be propagation through holes, but signals carried on wires penetrating
the shielding wall.
One goal for a moderately widely spaced grid (2 meters/6 ft spacing) would
be to establish an equipotential surface at the room boundary.
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