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What are specifics of usage of yours calculator for GCPW transmission?
At your site you offer free calculator for GCPW transmission which takes into account coefficients of, quoting, "dielectric constant", "gap" and width" and my question is - gap and width of what?

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Gap (G) is the distance between the trace and feed on that layer, Width (W) is the width of the feed, Height (H) is the distance between the layer with the feed and the layer with ground plane underneath.

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