Comment on xkcd #3158: Shielding Chart
Devjavu@lemmy.dbzer0.com 3 weeks ago
Why does the faraday cage not have a gray, but a purple? I thought it completely blocks radio.
Comment on xkcd #3158: Shielding Chart
Devjavu@lemmy.dbzer0.com 3 weeks ago
Why does the faraday cage not have a gray, but a purple? I thought it completely blocks radio.
Scirocco@lemmy.world 3 weeks ago
It depends on the wavelength of the radio waves.
This is visible in microwaves, where the wavelength is about 12cm, but the tiny holes of 1mm are small enough that zero (or super tiny?) radiation/radio/EM in that wavelength can pass through, but light (visible light that you can see) has a much, much smaller wavelength and passes just fine.
So, you could also say that a larger mesh (chain link fence?) of conductive material is also a faraday cage, but only affects things with a really large wavelength.
thus, faraday cages have a variable effect, depending on their configuration.
Devjavu@lemmy.dbzer0.com 3 weeks ago
Yeah, I did read some time ago that the max hole size was like half the wavelength and there existed also a penetration depth. I guess this makes sense with light making it through fences.