WiFi-proof windows keep office secrets

We had anti-wifi and frequency selective wallpapers, now Christos Mias at the University of Warwick (UK) has devised a method of producing tunable surfaces that can selectively block signals from wireless networks from spilling out of the office.

The grid could be embedded in any glass window and then tuned to block the selected frequency.
Tuning the circuit allows to block a different frequency if circumstances in the office change without having to remove the window or the embedded circuits. It allows for different window material variations and it can compensate for small FSS (frequency selective surface) fabrication errors.

Video.

Via pesco's Page - The Feature < University of Warwick.