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Microstrip_Calculator.php   9749 Bytes    01-12-2014 01:53:45


Online Calculator .:. Microstrip Impedance


( Bottom layer is ground )



Microstrip with ground




Substrate Thickness H  [mm]

 

Conductor Width S  [mm]

 

Relative Dielectric Constant εrel

 
   

Impedance  [Ω]

 

Effective Dielectric Constant εeff

 







Notes




Normally, the thickness of the substrate is defined by the manufacturer's assortment. As this is afflicted with tolerances, we put the tuning buttons there, in order to see what effect a ±10 % change will cause.

The calculations are based on a summary by Rick Hartley (see page 25 ff).




Appendix




Substrate Material εrel Loss tan δ Datasheet
FR2 Paper, Phenol resins 4.25 0.05 ...
FR3 Paper, Epoxy ... 0.041 ...
FR4 Glass, Epoxy 4.46 @ 100 MHz 0.022 ...
PTFE Teflon 2.20 ±0.02 @ 10 GHz 0.0009 RT/duroid 5880®





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t1 = 3913 d

t2 = 370 ms

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