Problem with Zo impedances in HFSS port

[dkmin96]

Hi, I am trying to simulatte ungrounded-CPW in HFSS. Center conductor width is
94um and the gap 62um. Based on the recommendation of HFSS CPW tutorial guide, the size of the port has been decided to be width of 654um and length more than 2000um. And I choose the option, solve ports only in the setup expecting the port impedance, Zpi, Zvi and Zpv to be correspondace. But I found the impedances Zo show many discrepancies, more than 5ohms.
Ports are located in the middle of cross section based on conductor of 1um. I am trying to find 50ohm changing port size. But it is not likely to be possible. Do you have any idea?
Thanks in advance.

 

[Azulykit]

Re: HFSS port

I regularly refer to the HFSS on line help guidance on impedance calculations describing when to select which form for the Zo calculation.

I also like to compare my results to another impedance calculator. Polar's Si9000 is helpful. Sample calcuators are all over the web.