HFSS phase reference

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kato

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Hello,

I have a coaxial line of length L. run it at frequency f. No dielectric just one PEC cylinder in a vacuum cylinder.
Defined waveguide ports.
since this is a TEM mode, I would expect the s21 phase to be 2*pi*L/wl.
It's not!

What am I missing?

Thanks
 

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