A Faraday Cage is a container made of conductor, shields interior from EMI Noise. But why does it work?. The Cage is named after Faraday, but why it works begins with Coulomb. Coulomb determined: Electric field E at radius r from stationary point charge Q is equal to….
But why does it work?
Coulomb determined: Electric field E at radius r from stationary point charge Q is equal to…
ϵ0 is the permittivity of free space and er is the radial unit vector
…in such a way that the interior fields within the conductor cancel out to zero
Holes must be sufficiently smaller than the wavelength (λ) of the signal to block it, which relates to frequency (f) with this equation:
c= speed of light. You usually want holes smaller than 1/10 of wavelength
Thus, the wavelength is 0.14 m, or 14 centimeters
At 1/10, we want holes smaller than 1.4 cm
Question: Would this always work? Is what condition could
3G noise still get through the cage?
…this could help keep cage at equilibrium