Polyline Refinement

I would be grateful if you can explain in more detail how to use Polyline Refinement expanding what is already in the UserManual.pdf.

 

Consider the Yagi_Pattern_Optimisation.cfx example from the ExampleGuide. Let's say that I want to know how the Yagi performs when the elements have different shapes (bent, folded dipole, etc).

 

To start, I replace the straight Active Element with a Polyline. After recalculating, all results are the same as before as one would expect. Now insert two corners in the Active Element, for example, at N: L1*lambda/2 and N: -L1*lambda/2, so the Active Element has 3 sections with the Port in the middle. This doesn't change the physical problem, but recalculation shows a significant difference in the impedance magnitude compared to the original model using a standard mesh.

 

Ideally I would like to refine only the mesh of the Active Element. If I use Polyline Refinement do I have to copy the same Corners that I defined for the Active Element? What values should I set for the Radius and Mesh Size in this context? How can I guess what is a reasonable Mesh Size?

 

Many thanks in advance.