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I have calculated the correct width of a trace to give it a 50 ohm impedance. But how near the 50 ohm trace can I do a copper fill so I don't effect the 50 ohm impedance?
Exact impedance of "surface coplanar waveguide" (microstrip with embedding ground plane) will be calculated by advanced tools. As a rule of thumb, you will see less than 5% impedance reduction with ground separation >= substrate height.
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