thanks, but i need to know the converse effect; if the RF escapes out from insideAccording to the emDrive people it should start to fly.
The RX/TX shielding effectiveness is the same but it might get a little hot if you put the transmitter inside the RF sealed enclosure.
Why would you think it would be any different?thanks, but i need to know the converse effect; if the RF escapes out from inside
because another answer from a RF engineer that i received elsewhere and also by putting my phone inside a fully sealed metal pot with lid (no plastic or gaps) and it still working like normal.Why would you think it would be any different?
but then why does my phone work to receive calls inside a metal pot with lid and no gaps and no plastic sections?If it could, we could make a great refrigerator. No energy comes in. Energy goes out. Temperature keeps dropping.
Seems like Maxwell’s demon to me.
Bob
The obvious answer is the POT is not RF sealed at the frequency in question because for a cell phone to work it needs to transmit and receive. so neither is being totally blocked. Post a picture of the pot and sealing procedure.because another answer from a RF engineer that i received elsewhere and also by putting my phone inside a fully sealed metal pot with lid (no plastic or gaps) and it still working like normal.
it is metal on metal, NO gap, with overlap, it is a good stainless steel pot, phone works inside as normalHello,
How is the contact between the pot and lid arranged?
Is there a RF gasket between the pot and lid?
https://interferencetechnology.com/...g-gaskets-offered-interactive-sales-drawings/
Bertus
Very small air gaps at cell phone frequencies allow RF energy flow. Notice the Trash Can video of the test without RF sealing tape on the metal to metal 'seal' .it is metal on metal, NO gap, with overlap, it is a good stainless steel pot, phone works inside as normal
that is what i thought tooWhy doesn't the ungrounded metal box just re-radiate the RF? Isn't that what the ungrounded/unconnected elements of a Yagi antenna do?...They re-radiate the RF.
It's mainly because of skin effect in the RF case (at low frequencies and DC the charge distribution and ground effects are more into play) of a sealed Faraday cage. The conductive inner and outer surfaces are effectively two separate conductors separated by a nonconductor of RF (shielding) because of a boundary condition between free space and a good conductor beginning at some value of RF. The RF energy is reflected back into space or is absorbed as heat in the increasing effective resistance of the conductor as the RF energy enters the surfaces of the connector and moves deeper.Why doesn't the ungrounded metal box just re-radiate the RF? Isn't that what the ungrounded/unconnected elements of a Yagi antenna do?...They re-radiate the RF.
Actual physical antenna resonance (a special condition but not a necessary condition for EM radiation) is not a much of a factor in the totally enclosed shielding effect just like it's not in the small gap leakage case. The leakage dimensions needs to be on the order of 1/50 of a wavelength for significant direct radiation escape from the crack but the skin effect of the conductors on the crack surfaces provides a transmission line short to the exposed outer surface for energy transfers across the RF nonconducting middle of the shielding.That and that the box is not constructed to be at the resonant frequency. Any possible radiated RF would be at a signal level so insignificant it would be virtually impossible to separate it from the greater strength background noise. Hence, effectively none.
by Aaron Carman
by Duane Benson