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[DMARATHE]

 

Hi Sehwa,

I suggest you to refer HFSS help PDF > HFSS Technical Notes > Post Processed S-Matrices > De-embedded S-Matrices in HFSS

As per help document, HFSS ignores attenuation constant and considers only phase constand while performing de-embedding. This implies that, if you are considering a phsycal line of lenght 3 cm and simulating two scenarios of actaul cross section 5 mm and 10 mm and de-embedding the S-parameters.You may find slight gap in both cases if you have a finite conductor and lossy dielectric. Because losses will be different for 5 and 10 mm line length.

I hope this helps.

Thanks.