See if you can find the dielectric constant for both materials and pick the lowest one. The best material I found was made by a company called Stealth Technologies back in the 90's. I had Andrew perform tests on their range with a variety of materials including 1/4" PVC, 1/4" fiberglass, 1/4" ABS Plastic, and the stealth "sandwich" which was a 1" thick piece of closed cell foam between two 1/8" pieces of ABS. The stealth material won out. The fiberglass was the worst. The PVC and ABS were about the same and presented only a small amount of loss. These were at PCS frequencies right around 1800 MHz. You have to figure a bit more loss the higher frequency you go.
Regards, Cameron On Wed, May 25, 2011 at 7:28 PM, <lakel...@gbcx.net> wrote: > *Not gonna be a problem. I have antennas behing 1" Lexan with no real > discernable difference > ** > ** > ** > **Sent via DROID on Verizon Wireless* > > > -----Original message----- > > *From: *Tom Sharples <tsharp...@qorvus.com>* > To: *WISPA General List <wireless@wispa.org>* > Sent: *Wed, May 25, 2011 22:45:26 GMT+00:00* > Subject: *[WISPA] Attenuation of polycarbonate or acrylic at 5.8Ghz? > > Subject: Attenuation of polycarbonate or acrylic plastic? > > > Hi, we're building a wireless video observation system for a lumber mill > loading area. > This is an extremely rough-duty environment with huge logs swinging around, > and any exposed antennas, cameras, etc. would shortly be smashed to bits. > We're thinking of installing everything in a 1.5 ft. diameter thickwall > steel pipe, and installing our required 5.8Ghz panel antenna flush with the > end of the pipe, covered with a 2" thick piece of polycarbonate or acrylic. > The link only needs to work at a distance of around 150 feet. However I > can't find much info on-line about the RF attentuation of clear plastic > materials (or if it's even enough to matter) at 5.8Ghz. Anyone out here > ever > had to do something like this? > > Thanks, > > Tom S. > > > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > > -------------------------------------------------------------------------------- > > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ > > > > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > > -------------------------------------------------------------------------------- > > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ >
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