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T O P I C R E V I E W
somikoda
Posted - Apr 17 2011 : 17:10:46 Hello!
When I'm calculating the inductance of a rectangular PCB-strand in FastHenry2, the inductance result differ with a factor 1000 compared with analytical/Q3D results. According to various books, the partial inductance of a PCB-strand is about 500nH/m which indicates that the calculated inductance results from FH2 is wrong. Can anyone shed some light over this matter?
The dimensions of the strip are: length=30mm, width=5, thickness=0.018.
Analytical: 18.1nH L = (0.0002*l)*(log((2*l)/(w+t))+0.5+(0.2235*((w+t)/l)))
Q3D: 17.6nH (@1GHz)
Regards Somikoda
2 L A T E S T R E P L I E S (Newest First)
Mathias
Posted - Nov 02 2011 : 15:20:33 I had the same problem. The reason was the first line. your first line contains .Units MM FastHenry ignors always the first line. So it uses the unit Mils.
Enrico
Posted - Sep 07 2011 : 23:15:34 I'm not sure about your result, running your input file into FastHenry2 gives:
