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CPW CPS transition (CST - port definition problem)

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batman11

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Hello,

I am simulating a CPW to CPS transition in CST using transient solver.

I am not sure if I am setting the port parameters correctly. I tried two appraches:-

1. Defining multipin port and setting up potentials. (But this means I am manipulating my simulation and only getting the desired even mode whereas in reality I might have both even and odd modes. I have used an air bridge to suppress the odd mode but I am not sure if it helps)

2. Next I used electric shielding for the ports. This way I get the right modes on CPW side but on the CPS side the mode is not right.

And the results vary in the two cases. I am confused please help. What is the right way to set up the port potential for CPW and CPS? How can I obtain the desired mode.
Is it important that I obtain my S parameters for both even and odd modes?

Thanks
 

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