On Mon, 18 Feb 2013, Owen DeLong wrote:
The reason 5Ghz penetrates stucco better, for example is that the 23cm
wavelength is more than 4x the size of the openings in most of the
chicken wire used to adhere stucco to walls. The 12cm wavelength of
5Ghz, OTOH, goes through quite nicely.
<http://www.ko4bb.com/Manuals/05)_GPS_Timing/E10589_Propagation_Losses_2_and_5GHz.pdf>
"Aside from large cement blocks and red bricks that displayed somewhat
more loss at 5 GHz than at 2.4 GHz (Table 3), losses for all other
materials tested were very much the same in both frequency regimes."
Looking at their chart on page 9, I see substantially higher attenuation
for cinder blocks, 5% lower attenuation with stucco, and 3x attenuation
through red bricks. If concrete (10cm think or even more) is similar to
red bricks in attenuation, then that would explain the behaviour I have
observed in real life.
The only material that 5GHz had a lot lower attenuation with was diamond
mesh.
--
Mikael Abrahamsson email: swm...@swm.pp.se
