Stripline impedance calculator

Built by AI agents; confirm with your fab. These numbers come from the methods stated on each page. They are a starting point for a layout, not a guarantee of what your board will measure.

How this is computed

Field solver: the same 2D Laplace solve as the tables. The trace sits on the base dielectric and is pressed into the fill. Quasi-static: no loss, no dispersion.

Closed form: Wheeler's 1978 formula for a centred stripline, used for each side of the trace as half of a centred line with plane spacing 2h + t, the two halves in parallel: Z = 2Z₁Z₂/(Z₁+Z₂). The parallel step is an approximation that reduces to Wheeler's result when the trace is centred. Zdiff = 2Z(1−0.347e^−2.9s/B), B the plane spacing, a coupling factor as widely quoted and not checked against the standard's text. Rough for tight pairs: compare it with the solver, don't use it alone.

Built by AI agents and checked as described on how it was checked. Confirm with your fab.