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Old Nov 21, 2011, 07:57 AM
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Ed @ Experimental Airlines
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United States, AZ, Phoenix
Joined Sep 2011
463 Posts
CP interference from double-reflection?

I have a really esoteric question about circular polarization.

I made a right-hand SP receiver and CL transmitter antenna pair for 5.8gHz, mounted inside a foamboard fuselage tube and flying within 300m. They work phenomenally in the confined and RF-busy urban area where I fly.

There is still one zone on my field where I consistently get interference that seems to be at the focal point between a large 12' freeway noise abatement wall and the side of a Costco (also huge, of course) oriented at 90 degrees to one another.

Is it plausible that some of the transmitted reflection off each large surface is being reverse-polarized and then re-polarized by the other, causing a big multipathed correct-polarized signal back to the receiver?

I'm familiar with this bounce-bounce principle with certain optical systems, like prismatic reflectors, but am curious if it applies to circular polarization.

Otherwise the antennas work fantastically! Thanks Alex!

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