The concept of radiofrequency (RF) shielding is simple: simply put a barrier between the source of the radiation and the area you want to protect. But keep in mind that in many ways, RF behaves like light and can reflects off of some surfaces… working its way around any shield which is less than a complete enclosure.
Imagine that you are outdoors on a sunny day. You set a large mirror on a stand above your head. The attenuation for the mirror is very high, perhaps 120 dB or more, so basically no light comes through the mirror. If leakage was not an issue, you would be in total darkness. We all know this is not the case. Leakage from the sides easily illuminates the shaded area. Granted, the amount of illumination is less than standing in full sunlight, but the attenuation is nowhere near 120 dB. Maybe more like 20 dB. Furthermore, using a shield with even better attenuation will not yield any more benefit.
To achieve a high level of shielding, you must control leakage VERY carefully. Gaps under doors, joints between shield sections, and even pinholes from sewing shielding material can permit these high frequency signals to penetrate. You need to create a “complete” enclosure. Any part that is not shielded is a leakage point.
In addition, it is critical that you remove RF sources which are inside the room. Check with an EMF Meters such as an RF meter for cordless phones, wifi routers, laptops, baby monitors, etc. An RF meter will also guide and evaluate the effectiveness of your shielding installation.
Remember to control leakage, such as the gap around the door, switch plates, mounted light fixtures, vents and so on. Contact us if you need advice.