momentum artwork and primitive?

Hi, there
I have a question about momentum simulation. Suppose I have three layout design with the same shape and substrate and port setting. These designs are shown below as you can see them, all of them is nothing about two microstrip lines with different width connect together. Only I construct them with different ways, the first one is composed of two MLIN lines connected by one MSTEP. the second one is two MLIN lines connected directly with the MSTEP btw them. the third one is manually drawn without using any system-defined artwork. I simulated all these cases, and got different result. (I simulate them each in a separate design for fear that momentum should calculate the coupling btw them), My question is which design is more accurate to the real situation?



Thanks

design

result

That is interesting. There should be no difference when you simulate the design in Momentum, because the artwork should be exactly the same. Have you looked at the Momentum mesh? Can you post the Momentum mesh for each case? It could be that it is meshing things differently in each case, leading to different results. Interesting.