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Ground backed coplanar waveguide impedance calculator

Calculate Coplanar impedance for given PCB parameters.

w (mm)

g (mm)
h (mm)




*The structure may propagate in 3 modes: coplanar waveguide, coupled slot lines and microstrip. To avoid microstrip modes, have h >> (w+2g) and extend component side ground away from the trace by > (w+2g).
*Equations from Brian C. Wadell, “Transmission Line Design Handbook”
*Elliptic integrals are calculated using the approximation from Wolfgang Hilberg "From approximations to exact relations for characteristic impedances" and are accurate to within 4x10-12