ADS 2011 efficiency question

Hello everybody,

I'm designing an antenna using ads 2011 and after launching the simulation I request the 2D plots and the antenna's efficiency. So, the question is if that efficiency value takes into account the reflexion loss or just the conductive/dielectric loss.
If the antenna is not matched with the power source (waveguide) will the efficiency change? I mean, I know that the efficiency will vary due to its matching in real conditions, but does the ADS take it account?

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