I was actually involved in this study of this in the mid nineties with Andrew back when they were making pcs antennas. Their engineers claimed that fiberglass would be fine and I said no way. I had them conduct a study using several different materials. If I can dig it up I'll scan it in and send it. But the bottom line is the best material was ABS plastic. Actually the absolute best was a product made by a company whose name escapes me but it was a closed cell foam sandwiched between two layers of ABS plastic. I believe the company was called stealth technologies. Anyway it was only slightly better than just the ABS plastic alone. Obviously you want to stay away from thicknesses that are multiples of one quarter wavelength. On Apr 8, 2015 5:32 PM, "Peter Kranz" <[email protected]> wrote:
> Anyone have much experience with molded concealment panels? On a > particular structure, the tower owner added panels in front of our > equipment to great detriment.. Looking for an alternative product that > won’t crap on our parade. > > > > We performed testing today at 5.8 Ghz.. Here is a table of before and > after signals for 5 customers we took measurements from > > > > Before / After / Delta > > HC -56.0 / -57.4 = 1.4 > > RO -63.7 / -65.2 = 1.5 > > WB -58.7 / -60.5 = 1.8 > > SF -59.9 / -61.8 = 1.9 > > GG -60.7 / -62.5 = 1.8 > > > > As you can see the average attenuation of the panel was measured to be > -1.68dB (a 20% reduction in signal level).. This is similar to the vendor > provided attenuation number of 1.31dB for straight on and -2.66dB for 45 > degree > > [image: cid:[email protected]] > > 45 degree angle: > > [image: cid:[email protected]] > > [image: cid:[email protected]] > > > > -Peter >
