3 ms·
I keep hearing that for Faraday cages but its not clear to me why. Why should it be grounded? The cell signal in the Faraday cage causes a mirror signal on th
by skeptikal 5y ago
I keep hearing that for Faraday cages but its not clear to me why.
Why should it be grounded?
The cell signal in the Faraday cage causes a mirror signal on the cages inner surface and the cage’s conductivity ensures that the potential is zero elsewhere in the cage.
Why do I need the ground? Is it a consequence of not having a perfect conductor?
- AnotherGoodName 5y agoThe case itself becomes an antenna if it's not and just re-resonates the signal.
- skeptikal 5y agoDoes it though? At what frequency? In the limit of f=DC this is trivially not true. Also, if that were the case, an airplane couldn't be made into a Faraday cage. Also, the cage+Earth system would itself be an antenna. If you need ground for a topologically imperfect cage, maybe… but I doubt it. I think (but I don't know!) this is like the legends surrounding engine torque car guys believe. Electrical engineers putting everything to ground because they got burned