Re: Oddball Antenna Question?

"Roy Lewallen" wrote
If you do a bit of analysis with a modeling program, I think you'll find that if you generate a circularly polarized signal, it'll become nearly linearly polarized once it reflects from the ground. ... There might
be a way to generate a signal that's circularly polarized after reflection, but I don't know how to do it.
________

Roy, won't a c-pol signal remain c-pol after a low-angle terrain reflection, except that its rotation sense is reversed? (The magnitudes of the v-pol and h-pol reflection components are nearly the same, but there is a 180-degree phase reversal in the v-pol reflection with respect to the h-pol reflection.)

This has been applied with good results in analog TV broadcasts using c-pol, because a c-pol receiving antenna rejects reflections of the transmitted signal -- which effectively reduces the multipath "ghosts" seen on a TV set when linearly polarized receive antennas are used.

RF

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