Flat Wire Inductance Calculator
The inductance of a flat or ribbon wire (rectangular cross section), can be calculated using the following formula. The inductance of a track on a PCB can also be calculated with this.
Where l = Length in cm
w = Width in cm
t = thickness in cm (PCB copper @ 1 oz/ft2 = 0.035 mm)
The original for this formula is by F.E. Terman and can be found in the Radio Engineers Handbook, McGraw-Hill, New York, 1945. The units have been changed from µH to nH and the thickness from cm to mm for easier working on PCB's.