Lossy-lossless CPW transition in MWS

Hum, I dont know if it so obvious, maybe...
How can I measure easily the reflection coefficient due a lossy-lossless interface between two of portions of CPW in MWS, or even better between the port plane and the lossy CPW. Is there a way to know in wich range the results could be trusted, considering that the CPW would be match for only one freqeuncy?
Thank you
David

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