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Special wallpaper deters WLAN intruders

Posted: 17 Aug 2004 ?? ?Print Version ?Bookmark and Share wallpaper? bae systems? frequency selective surface? fss?

A British aerospace company has developed special wallpaper than keeps wireless LAN radio signals inside, preventing intrusions from outside.

An article posted on describes the special wallpaper developed by BAE Systems, which has what the company calls a frequency selective surface. FSS, which also used to hide radar signals on ships, can be set to let only precise frequencies through while blocking all others.

Practically, that means that WLAN radio signals can be kept inside while letting cellphone signals out, according to the article.

The wallpaper is made from a 1mm sheet of kapton, the material used for PCBs on small mobile devices, according to the article. The kapton was coated with a thin layer of copper. The wallpaper works in all frequency ranges used by Wi-Fi equipment, according to the article.

The system can be switched off to let signals in during an emergency, according to the article. The wallpaper costs about 500 British pounds per meter? and the article said that BAE is working on similar protection for windows.

- Mobile Pipeline News

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