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how to interpret waveguide multi mode s-parameters in CST

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yefj

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Hello,I have a cylindrical waveguide which is excited with two modes in each ports as shown bellow. How ever i cant see the meaning of S-params shown bellow. photo one shows total isolation(-100dB) while photo 2 shown total path threw.(-0.17dB) What is the meaning of those S-params? Why one is very low and the other is almost 0 dB.

1627639910850.png

1627639949820.png
 

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