Indeed very usefullTo check influence of reflections, increasing measurement distance should follow the -6 dB/(distance doubling) rule.
Measure a dipole to get a gain reference. The dipole can be just two wires tuned for actual frequency.
Possible but complicated to use the horn antenna data sheet antenna gain for anything useful
thx all for the helpful and interesting replies.
I decided to use the gain comparison method so I'm looking for a 3rd antenna to use as TX and then I'll compare the DUT S21 with the standard gain horn's. This should lead to more precise results rather than the way I was planning to do.
Thx also for spotting a mistake in my equations, I should use
-10log(P0/Pr) = S21
rather than
-10log(P0/Pr) = -10log( (1 - abs(S11)^2) / abs(S21)^2)
Cheers
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