The characteristic impedance (Z_{o}) of a microstrip transmission line can be calculated using the active calculator or the formulas at
the bottom of the page.

The following formulas are from an article by Rick Hartley page 27 http://www.jlab.org/accel/eecad/pdf/050rfdesign.pdf

The formulas give results within 3% of the results obtained in http://www.polarinstruments.com/support/cits/IPC1999.pdf

More calculators for transmission line can be found at http://www.circuitsage.com/tline.html

Where ε_{r} is the Relative Dielectric Constant

W is the Width of track

t is the Thickness of track (1 oz/ft2 = 0.035 mm)

h is the Thickness of dielectric

This calculator is provided free by Chemandy Electronics in order to promote the FLEXI-BOX

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