Microstrip Transmission Line Characteristic Impedance Calculator

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

                                                              [diagram of PCB layers]

 Where   εr = Relative Dielectric Constant

               W = Width of track

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

                                                                                                 h = Thickness of dielectric

Enter the εr of the PCB: 
Enter the width of the track:  mm
Enter the thickness of the track:    mm Effective Dielectric Constant (εeff): 
Enter the thickness of the dielectric:    mm  Characteristic Impedance (Zo):   Ohms
 

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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

[calculation formula]

[calculation formula]

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

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Last modified: March 25, 2008