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CST Microwave Studio Multiple Coupled Stripline Simulation

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ngkrk6

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I am having some problems with simulation of multiple coupled microstrip lines. I would like to adjust the width of the individual strips such that the input impedance of this line is 50 ohms. I am having issues with the port declaration to verify the input impedance. I have read the Waveguide Port Overview in the CST Help as well as the multipin port overview and look at a similar example of a 3 conductor tapered stripline. These have not seemed to help. I currently have declared two ports each with 5 multipin inputs. When i try to run this simulation i get an error saying, too many modesets are defined on multipin port 1. Regarding a port with 4 conductors only 3 modesets are possible.
This message confuses me as i have 5 individual striplines created. A picture is below. Any help would be much appreciated. Thank you!!

multipin_stripline.png
 

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