ears” is the old saying that advises against discussing
secrets in apparently empty rooms. These days it’s the
windows that pose more of a threat to our secrecy. While there are
many means of protecting sealed rooms from radio and microwave
snooping, if the room has a window that protection has a
Not any more though – now that researchers at the UK’s
University of Warwick have devised a method of producing tuneable
surfaces that can selectively block signals from wireless networks.
Dr Christos Mias from the university’s School of Engineering
has developed a “dipole grid based frequency–selective
surface” (also known as an FSS surface) to perform this
This grid of circuitry has the potential to be embedded in any
glass window and then tuned to block the selected frequency. Given
the value we all place on our privacy Dr. Mias work may yet prove
– to coin another old saying – that “silence is
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Page contact: Tom AbbottLast revised: Thu 31 Mar 2005