Does anyone know of a tool or formula I can use to work out the impedance of a trace with ground on either side of it, i.e. a coplanar wave guide. There are plenty of tools to calculate the impedance of microstrip. I suspect the presence of copper on the sides of the trace lowers its impedance. My goal is to hit 50 ohms.
How did TI work out the gap between the 50 ohm traces and the group pour on TI eval boards?
Thanks!
CJ
