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REPORT COPYRIGHT VIOLATION IN REPLY
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Message Subject
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Help With Building A Faraday Cage
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Poster Handle
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Anonymous Coward |
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Post Content
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Being so broadband (1 MHz - 300 GHz) is the problem.
Guidelines:
(1) Low frequency coupling is dominated by wires and cables, e.g., power and internet you bring in.
(2) High frequency coupling is dominated by apertures, seams, and joints.
(3) You could bring signals in via fiber optics through an aperture with a tube-line extension to act as waveguide below cutoff.
(4) Power is tough, but at least you can filter the heck out of it, unlike signals.
(5) If any energy does get inside, the electric fields will be enhanced by the high Q of the interior.
(6) A wavelength at 300 GHz is 1 mm. You'll need a mesh finer that one tenth of this to achieve decent attenuation.
(7) Skin depth of copper at 1 MHz is about 0.065 mm. Five skin depths would be 0.325 mm.
Hope this helps (and that my math is correct!)
Quoting: Life and Love Thanks for the reply. I apologize for asking you to repeat the excellent points you have made but would you mind explaining in *layman* terms the following points please: (1), (2) and (5). I don't know if its possible in point (4) to ignore the RF Radiation caused by the electrical wire and the RJ45 LAN cable inside the enclosure ? The only concern that I have with point (4) is that by allowing these two and only two cables (one for power and the other LAN cable) into the enclosure that it does not allow inside UHF(and other bands) signals to exit the enclosure through the same opening/path and vice versa in that it will not allow these same type of RF device signals to enter into the enclosure again through the same pathway that these two wires use to enter the enclosure ? I understand point (6) perfectly. I will likely need to have the woven mesh aluminum specially made if I cannot find the 1/10 mm distance width you have described off the shelf. In point (7) how is skin depth related with attenuation of RF signals ? Thanks again
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