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How to interpret S parameter result in CST MWS?

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Kaswechiha

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I'm designing an FSS in CST MWS that should be providing maximum reflection for the band 12.75 GHz to 14.5 GHz and hence minimum transmission to this band. I've got the results has shown above. How do I find the return loss and transmission loss? Out of these 8 data points like SZmax(2),Zmax(2), which are the return loss and transmission loss?

Zmaxmin Floquet.jpg
SParam_Plot.jpg
 

You measure a Differential Structure and it's complicated..
Instead place an Ideal Balun at both sides then simulate this structure as Single Ended..
 
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