Electromagnetic & radio frequency shielding

There are different ways to protect from electronic eavesdropping: either by securing the wireless signals (but then others can still view the network) or by trying to contain the wireless signals and prevent electronic signals to escape or to enter. The latter option is obviously a more thorough measure and give more security. To realize this one can create a full metal enclosure but that is aesthetically not appealing as it requires to integrate metal meshes in the glazed surfaces. The better way of containing wireless signals is to use RF Shielding glass or, in the case of renovation or upgrading to apply a Radio Frequency shielding film. Solar Gard EMS 7030 is such a film.

Solar Gard has been tested in accordance with standard ASTM D4935-10, measuring the effectiveness of the attenuation of electromagnetic waves between 40 MHz – 40 GHz: test samples are irradiated with a defined power flux density S1, the pervasive power flux density S2 is measured. The shielding attenuation is a nonsional measured variable in decibels(dB) adB = 10 • logS-dimennd calculated as follows:1 10 S 2 The measuring devices used are two Vector Network Analysers Rhode & Schwarz ZNB20 and ZNB40, with a measuring dynamics up to 140 dB. The antennas we use for ASTM D4935-10 are broadband TEM cells with radial polarization. A reduction of 10 dB corresponds to a 90% attenuation (reduction of the transmission); 40 dB corresponds to 99,99% reduction.