I simulated a differential fed antenna in CST. The antenna's two port has the same magnitude signal with 180 degrees of difference.
I setup the CST to excite the antenna with two ports simultaneously with 180 degrees of difference. After running simulation, the CST gives two curves labeled as "S1,1[1.0,0.0]+2[1.0,180],[3.5]" and "S2,1[1.0,0.0]+2[1.0,180],[3.5]", as the two thick curves shown in the attached graph. The second curve shows the value is larger than 0 dB from 1GHz to 1.5 GHz. This is out of my imagination, because it is a passive antenna. Similarly, I got some curves when I tried to simulate sequentially fed quad-port circular polarized antenna.
I didn't find information about how to translate them into correct S-parameters in the CST's help files.
So how can I translate the curves into correct S-parameters?
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