British scientists from QinetiQ –a technology development company– found a way to mass-produce frequency-selective screens which filter out radio signals while allowing others through, thus preventing, for example, phones to ring in cinemas, airports, hospitals or schools.

The wallpaper is made by printing an intricate pattern of fine metal grids on to the surface to be screened. Metal is then “grown” in the desired pattern when the wallpaper is immersed in a chemical bath.

However, the researchers admit that the technology does have a flaw: radiowaves can flood a screened room when a door is opened.

From Scotsman.
Related story: And now, anti-wifi wallpaper.