Massive discrepancy between EM and schematic

[Yashaz91]

Hi Everyone,
I am trying to design a CPW on a particular process technology, The manufacturer offers pre-defined models for CPW (schematic and layout).
When comparing the sim results there seems to be a large discrepancy in the phase.

Could someone help me with why this might be happening?

Thank You!

FYI: the blue is momentum and the red is the schematic.

 

[volker@muehlhaus]

Which process is this?
Can you show a comparison of S21 phase?

 

[vfone]

What substrate they use for CPW to get 0.5dB loss at 300GHz !?
I know, this is about an RFIC silicone substrate, but I think at 300GHz you breathe near the CPW line and the phase change 180°

 

[volker@muehlhaus]

What substrate they use for CPW to get 0.5dB loss at 300GHz !?

SiO2 in most cases, that is really low loss, also used on chip for optical waveguides