Health and electro-sensitivity: a wallpaper ... anti Wifi!

[Christophe]

Grenoble researchers presented on Thursday a wallpaper described as “revolutionary” which makes it possible to filter the electromagnetic waves of a wireless local area network (Wifi) or a mobile phone, without disturbing the waves of the radio or of the frequencies of help .

Developed by researchers from the Grenoble Polytechnic Institute INP and the Technical Paper Center (CTP), this new product should be marketed in early 2013 by the Finnish group Ahlstrom, which has purchased the exclusive license. The mundane appearance of the wallpaper is covered with patterns traced with conductive ink (containing silver particles) which allow to “filter up to three frequencies at a time”, explained Pierre Lemaitre-Auger, teacher-researcher at Grenoble INP, during the forum 4i from Grenoble. The wallpaper was designed by a doctoral student from Grenoble INP, assisted by three other researchers. Its first objective is to allow better protection of data on a computer network connected by WiFi.

“A wifi network has protections that can be cracked by clever little ones. If you put wallpaper on the walls surrounding an office or an apartment, your wifi works well but it can no longer be hacked ”, underlines Mr. Lemaitre-Auger.

The wallpaper can also be used by people wishing protect yourself from electromagnetic waves. "Many people are interested in the problems of electro-sensitivity, in the fact that the waves would be dangerous for health", notes the researcher.

Without commenting on the merits of the debate, he stressed that this wallpaper offers "people who wish it the possibility of protecting themselves and having a very low level of waves in their apartment". It could thus be used in hospitals, performance halls or to protect bedrooms. As for the price of anti-wifi wallpaper, it should be “reasonable”, that is to say “equivalent to that of a classic mid-range wallpaper”, according to Mr. Lemaître-Auger. The technology developed could also be used on floor coverings, ceilings or windows, according to Guy Eymin Petot Tourtollet of CTP.

Source: http://geeko.lesoir.be/2012/05/03/un-pa ... anti-wifi/

[Forhorse]

It is really the "motive" which must do everything then ...
Because when I see that in an elevator whose cabin is entirely metallic (sheet metal) which is itself in an entirely metallic cage too (cladding sheets) a GSM phone still manages to work when we are actually in a double Faraday cage, I don't think that the simple fact of placing a few micron of silver on paper is enough to block the waves.
The innovation, if it works, must really lie in this famous "motive"

[plasmanu]

In mobile I turn on SFR
Well, it's the Ardèche, okay
But in a building with a metal frame there is nothing.
Yet 2 to 3 bars of 3G outside. Transmitter at 5/6 kms

The best is at Leclerc at tonton Édouard
Metallic structure the rest in wood.
Sfr: inside: no way to take a call.
Outside 5 full power 3g bars + transmitter in sight within 2kms as the crow flies.

Long live the metal and long live SFR

[dedeleco]

The fairly thick metal without holes really blocks !!
but often large holes, dubious thickness (10 times the penetration length) and the GSM pass attenuated.

Otherwise this wallpaper full of money must be much more expensive than a simple iron metal !!

You have to put it everywhere on the entire surface of the room without a single hole !!!!
l
The pattern (like a network of small coils with tuned capacitance) blocks specific frequencies by resonance at the desired frequency.
Atoms at the atomic level do the same.

[plasmanu]

just as lead doesn't stop all gamma rays, but not bad anyway.

[Christophe]

Other news of the day on the subject: http://www.actu-environnement.com/ae/ne ... 15605.php4

A collective of Swiss doctors, the doctors in favor of the environment (MfE), calls for a reduction of the limit values ​​for the waves coming from wireless communication. "From a medical point of view, it is urgent to impose the precautionary principle for mobile telephony, wifi, high voltage lines, etc.", assures in a press release Dr. Peter Kälin, president of the Doctors in favor of the environment. In a letter sent to the assembly and the Swiss Federal Council, they ask for a division by ten of these limit values. The group relies in particular on the classification of radiofrequency electromagnetic fields as potentially carcinogenic to humans by the international cancer research center.

[dedeleco]

Small spelling remark on wallpaper is written on wallpaper.

Otherwise, electromagnetic waves down to the microwave have complex, but real, effects on living things.

[chatelot16]

GSM or WIFI waves are stopped at 100% by the slightest thickness of sheet metal or other conductive material ... but they also reflect perfectly on it, with even less loss than light on a mirror

this is how we still receive the phone or WIFI in a sheet metal elevator: there is always enough slit where the waves can enter, and find a path by successive reflection

Similarly, to protect yourself 100% from unwanted waves, transforming a piece into a Faraday cage is only possible by putting sheet metal on all sides, including the windows, without any leakage larger than 1/10 of The wavelength !

where this wallpaper can be a quality is not to be perfectly conductive, but to have an average conductivity to avoid reflection: even more important to stifle reflection on the wall than to prevent crossing. .. anyway GSM and WIFI do not cross walls well but pass through doors and windows and find their way by reflection