- #1
H_man
- 145
- 0
Why does my phone get a signal in a metal box??
Hi guys,
Earlier today I was telling someone about how EM radiation of low wavelength would have trouble passing through a cold plasma. I gave the example of the metal mesh in front of a microwave (as metal can be treated like a plasma).
Well... to demonstrate I popped my mobile in a metal box and tried calling it. The damn thing rang. So then I tried earthing the box and the signal still got through.. Do I need a thicker box or I have I misunderstood something fundamental.
Cheers,
Harry
Hi guys,
Earlier today I was telling someone about how EM radiation of low wavelength would have trouble passing through a cold plasma. I gave the example of the metal mesh in front of a microwave (as metal can be treated like a plasma).
Well... to demonstrate I popped my mobile in a metal box and tried calling it. The damn thing rang. So then I tried earthing the box and the signal still got through.. Do I need a thicker box or I have I misunderstood something fundamental.
Cheers,
Harry