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When I did microwave systems at 2 GHz and 6 GHz we would routinely get around 30 to 40 dB of isolation between vertical and horizontal signals on the same path. So yes the cross polarization values do increase at the higher frequencies.

I believe Avanti Antenna used this principal to get 20 to 25 dB of isolation between normal vertical polarized signals and horizontal polarized signals with their dual polarized PDL Quad antenna's. I also believe that man made electrical noise is generally considered vertically polarized, so going horizontal would reduce background noise a bit.

[QUOTE="KC9Q, post: 367601, member: 23691"] When I did microwave systems at 2 GHz and 6 GHz we would routinely get around 30 to 40 dB of isolation between vertical and horizontal signals on the same path. So yes the cross polarization values do increase at the higher frequencies. I believe Avanti Antenna used this principal to get 20 to 25 dB of isolation between normal vertical polarized signals and horizontal polarized signals with their dual polarized PDL Quad antenna's. I also believe that man made electrical noise is generally considered vertically polarized, so going horizontal would reduce background noise a bit. [/QUOTE]

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