Help with Maxwell 3D

Hi @ all,

I need some help with Maxwell 3D: I would like to determine the self inductance
of a multi-layer planar spiral coil. To know if I am heading the right direction in
Maxwell 3D I compared some online calculations of a single-layer planar spiral
coil with the matrix results from Maxwell 3D and unfortunately these don't quite
match (not even close)
Maxwall 3D gives for the given file: 0.675 nH whereas the online-calculators give
something in between 1.45 nH and 1.8 nH...
The dimensions are:
Inner diameter: 120μm
Track width: 15μm
Track spacing: 2μm
Track height: 2μm
Turns: 2.5

What is wrong?

Thanks a lot for your help!

Sorry i use maxwell v.11 but did you added the air region? it make difference in result. i went through this problem ( the result changes as the air region change Away of the accurate result so try to adjust the air region if you are sure that no problem in your model if you canmake your project work in maxwell v.11 i can have a look.
keep in contact as we are almost work in the same tenor
my private e-mail is nora707_n@yahoo.com
yours