When you increase the frequency, i.e. in 2,4GHz normally we decrease the radio range ?

In theory yes, actually we worked a lot on the shape of the antenna in order to balance this fact. By the way the more you increase the frequency the lower the wave is, that means the wave has more chances to bounce on the items in presence, then it can increase the bounces, i.e. the spreading of the wave. It is the same phenomena when the radio wave has to go through some holes.

Released for: Schneider Electric USA