peanutnjelly
Newbie level 6
Hello.
I'm using free saturn PCB toolkit to determine characteristic impedance of coplanar waveguide. But I get strange results.
In my opinion the impedance of coplanar waveguide should match the impedance of microstrip line when distance between GND on top and line goes to ∞ and the rest of distances are the same.
But the calculator say's that impedances are not equal.
Results matches the online calculator:
https://chemandy.com/calculators/coplanar-waveguide-with-ground-calculator.htm
I gues that equation for coplanar line is only valid for small distances W in comparison of h and S.
I'm using free saturn PCB toolkit to determine characteristic impedance of coplanar waveguide. But I get strange results.
In my opinion the impedance of coplanar waveguide should match the impedance of microstrip line when distance between GND on top and line goes to ∞ and the rest of distances are the same.
But the calculator say's that impedances are not equal.
Results matches the online calculator:
https://chemandy.com/calculators/coplanar-waveguide-with-ground-calculator.htm
I gues that equation for coplanar line is only valid for small distances W in comparison of h and S.