## Ground backed coplanar waveguide impedance calculator

Calculate Coplanar impedance for given PCB parameters.
w (mm) g (mm) |
h (mm) Er |
Impedance Eeff |

Notes:

*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}