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Why do I get different S21 parameters for waveguide in CST?

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An_RF_Newbie

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Hello,
I need to simulate a quad-ridged waveguide in CST.
2.PNG


At first, I set settings to excite the first six modes in the waveguide and I see the S21 for the first mode is less than -18dB at all frequencies.
3.PNG
After that, I set the modes to one and I started the simulation again, but at this step, I see the S21 parameter started at -23dB and ended at -2 dB.
1.PNG


I need to know why CST shows me different S21 values in these two ways of calculation for the first mode.

Best regards,
 

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