VladVlad replied to the topic: Calculate antenna gain from measured data.

I think you can calculate first an antenna directivity D and full radiated power Prad using your far-field measured data. Next step is to estimate the power Pdeliv delivered from the source generator to the antenna input port. Pdeliv ~ Pgenerator - Ploss - Preflected. Then the antenna gain G =~ D*Prad/(Pgenerator - Ploss) where Ploss is the attenuation in all circuits between the antenna input and generator.

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Microwaves101 replied to the topic: Calculate antenna gain from measured data.

This reply came from an actual antenna engineer, not some poseur like me...

"A common way to get gain from measured antenna data is to use the substitution method, i.e. using the exact same range setup, swap out the antenna under test with a standard gain horn and measure the horn antenna. You may need to measure multiple standard gain horn antennas to cover the frequency band of your antenna under test measurement.

Compare the raw measured amplitude of the SGH to the raw measured amplitude of the AUT and use the reference gain curve of the SGH to determine gain."

Hope that helps,
Steve