Multiconductor problems!

[grandizer]

Dear
I have to simulate a multi conductor structure formed from 3 parallel wires for calculating the Modal characteristic impedance Z0.
The wire has the dimension w, spaced by s , and has a thickness t , and a height h over a one common ground plate ( conductor number 4).
I starting by assigning a wave port ( containing all the cross section of the wires) for the structure and I proposed 3 modes per port.
Also I defined a terminal line from each conductor to ground .
The solution doesn't converge
Sad .
I do manual meshing but also no chance ..
I changed the boundary from pec to finite conductivity also I encountered the same problem.
When I solved for ports only, I founded an unpredictable result for the Z0 ?
Plesae can somebody help me ...
Thanks a lot

 

[Azulykit]

It sounds that you have something that might resemble a differential CPW with a ground plane.

Look into the online help in the "calculation fo impedance" area and I think you will find a helpful discussiion. Pay attention to both the impedance lines and the form of the impedance calculation, Zpv, Zpi, etc.

I suspect that you may find that you need to examine more than the first three modes.

Don't give up, you should be able to get it to work.

 

[grandizer]

Dear ..thank you for your reply , actually I try to simplify the problem to 3 conductor equally spaced and has a same height h , but the real case is 5 conductors spaced s1,s2,..s5 and the height is h1,h2,h3..,h5 respectively.
Also what I expect that the problem should be reciprocal i.e the modal characteristic impedance Zvi from both ports ( 1 and 2 ) should be the same .
But in my case I don't get the result..
Thanks