>
> > I would be very grateful if someone could point me in the right
> > direction about mobile phone shields. I'd like to understand how
> > shields can be effective during normal call use. My confusion is that
> > shielding could attenuate signal strength which could cause the phone
> > to transmit at higher power.
>
> Hi Sandy,
>
> There is a lot of confusion about cell phone shields.
>
> There are 2 points to remember:
>
> 1- the entire phone radiates, not just the antenna
> 2- depending on the design of the phone, a certain % of the radiation is
> absorbed by the user's head. This radiation is not useful for the
> communication. Ideally, the shield should shield this portion of the
> radiation, and still allow the balance of the signal to radiate outward,
> if
> the phone is still to work.
>
> Now, notice this: if instead of encountering a nice absorbent head and
> being
> "wasted", the radiation encounters a nice reflective shield (between the
> head and the phone), then you are not reducing the performance of the
> phone,
> you are actually improving it.
>
> Notice further, if you shield the side of the phone away from the head,
> you
> will reduce performance, and increase radiation to the head.
>
> Emil
>
>
>