Impedance-to-Geometry Solver
Solve for trace width or differential pair gap using the existing impedance models.
Live results
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Formula and worked example
Method. The solver uses bisection on the same logarithmic microstrip or stripline equation and exponential pair coupling equation as the impedance calculators.
Assumptions. Minimum width or gap is 0.001 mm. Width plus copper thickness must remain below 5h for microstrip or 1.5h for stripline. The gap search ends at 10h. Confirm final geometry with the fabricator or a field solver.
Example. With 0.18 mm dielectric height, 35 µm copper and εr = 4.1, a 50 Ω microstrip needs about 0.305 mm width.