Stealth wallpaper
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Stealth wallpaper has been developed by UK defence contractor BAE Systems to prevent electronic eavesdropping on Wi-Fi and local area network (LAN) systems, although this product is not yet commercially available.
It controls the transmission of radio frequency (RF) signals and provides a safer wireless LAN (WLAN) as an active frequency selective surface (AFSS).
The panels are 50 to 100 micrometres thick and are made in the same way as printed circuit boards -- layers of copper on Kapton polymer.
[edit] RF signal-blocking paint
NaturalNano of Rochester, New York has developed a paint that can be applied to walls in order to block RF signals in the high frequency range.
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