[dewayne at warpspeed.com: [Dewayne-Net] New paint blocks out cell phone signals]

[coderman]

On 3/2/06, Eugen Leitl <eugen at leitl.org> wrote:
> ...
> Using nanotechnology, particles of copper are inserted into
> nanotubes, which are ultra-tiny tubes that occur naturally in
> halloysite clay mined in Utah. Combined with a radio-filtering device
> that collects phone signals from outside a shielded space, certain
> transmissions can proceed while others are blocked, the Chicago
> Tribune reported.

hmm, faraday cage on demand sounds kind of useful.  they don't mention
the level of attenuation though, and i suspect it's not that great.

is anyone else aware of systems that can provide variable rf
attenuation on demand?