HFSS internal mesh too large

Hi, folks:

I am simulating a diff pair by HFSS.
The geometric is quite small.
Trace width=3um.
Trace seperation=7um
Trace distance from ground plane=20um

I ploted the field plot on port, it looks quite ok. However, the field plot on internal cross-section face (somewhere middle between two ports) is quite coarse. Since I have already make accuracy setting very high. How can I make sure that the results are right?

Is it right to have internal field so carse? How to refine it?

thanks,

Pic

Hi

We did a work about mesh ops and refining. See pdf. It's written in german though but it has lots of pics. Just ask if necessary.

D.

PS: check:
http://wanda.fh-aargau.ch/e/projekte/2004ss/lip-schwei/

Interesting issue.
I am curious that why HFSS converge with so coarse mesh?