ADS and the Gain of the Antenna

Hello to everybody,

I have a stupid problem with the ADS Momentum. When I use the Post-Processing tool to see the Radiation Pattern in 3D mode, I can see the Gain and the Directivity of my antenna, BUT both are in dB (not dBi or dBd, just dB). In my case the Directivity is 3.21dB and the Gain is 2.62dB.

If now choose the 2D option of the Radiation Pattern so as to extract the values to Excel for the polar plot, I am getting different results. For example, instead of 2.62dB, the max value from tha radiation pattern is 5.25dB.

The designed antenna was constructed and tested at an anechoic chamber. My results are in dBi (because I used a reference antenna). How can I compare my measured results with the simulated results?

Thanks :)

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