Metal case [was: Application idea: Bicycle computer]

Flemming Richter Mikkelsen quatrox at
Tue Mar 18 21:18:11 CET 2008

On 3/7/08, Erland Lewin <erland at> wrote:
> 2008/3/6, JW <jameswillmer at>:
> > Why do people want metal cases so much...???    Features in wiki
> > hardware wishlist too.
> > My thought is aluminium = metal = faraday cage = stops gps, gsm, wifi,
> > bt signals = BAD idea
> The back of the iPhone is mainly metal isn't it? Many attractive cell phones
> today have at least parts of their cases made of metal.
> Also, I read about someone (forgot where) trying to make a Faraday cage, but
> apparently it is quite difficult in practice. For an efficient cage you
> apparently need many meshes with holes in different sizes for different
> frequencies if I recall correctly. I guess this could be easily tested by
> putting a cell phone in a tin can and trying to call it...

I don't think it is as easy as you think. Please correct me if I am wrong.
For low frequencies the cage will have little effect, but for the wifi
it is not easy to predict. It gets complicated with high freqs. And if
it seems to work nicely when you test it without touching the phone,
maybe it don't work so nice when you do??? I am no expert... just my

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