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Odd/even impedances simulation for a not typical structure

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Eres_89

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Hello everyone.

I'm writing here, because I need help/sugestions.

To the point:
I want to simulate structure, which is presented in attachment (picture no_1.png). Most of popular calculators (such as the TXLine, the AppCAD) has solutions for really typical coupled elements (for e.g. coupled striplines).
I try to simulate no_1 structure in EM simulator such as the HFSS or the AWR Microwave Office but I don't know how can I "measure" even/odd impedances. I have calculated values of Zoo and Zoe but without proper simulator/calculator I cannot design physical structure...

Can you help me with this problem ?

Best Regards

 

Hi Eres_89,

You mentioned that you have calculated values for Zoo and Zoe. How did you determine the modes ? For example, for odd mode: You have fields coupling between the top two traces. Similarly,for the bottom traces - Fields going from the center signal line to near by grounds. What about even modes ?

If you know how many modes are propagating (both even and odd), then you can use Driven Modal setup in HFSS with the corresponding integration lines for odd and even modes and look at Port Zo
 

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