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Coplanar_Waveguide_Calculator.php   12173 Bytes    20-11-2015 18:48:15


Coplanar Waveguide Impedance Calculator


( Bottom layer as well as adjacent copper is ground )




Coplanar Waveguide Coplanar Waveguide




Substrate Thickness H  [mm]

 

Gap Width G  [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.




Appendix




Size L [mm] W [mm]
0201 0.6 ±0.03 0.3 ±0.03
0402 1.0 ±0.1 0.5 ±0.05
0603 1.6 ±0.15 0.8 ±0.15
0805 2.0 ±0.2 1.25 +0.2/-0.1
1206 3.2 +0.1/-0.25 1.6 +0.1/-0.15
1210 3.2 +0.1/-0.2 2.6 ±0.15
2010 5.0 ±0.15 2.5 ±0.15
2512 6.3 ±0.15 3.2 ±0.15




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 = 3876 d

t2 = 560 ms

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