I am trying to simulate a structure with 1 um. as smallest dimension. Does anyone have a clue as to what mesh settings should I take :-D. I am using CST 2010 as the tool and frequency range is 0-40 Ghz.
you may start with 1/10 rule (10 cells per wavelength of maximum frequency) but which may not converge to correct result. After initial simulation see what is happening at that minimum dimensional part. if you see major variation of field current near the minimum dimensional part then you may need to increase the mesh density. If total mesh size becomes huge, then you may think of regional manual meshing.