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Structure
Coplanar Waveguide is a transmission line system consisting of a central current-carrying trace atop a substrate, coplanar with side grounds extending beyond a symmetric gap to either side of the trace.  There are different kinds of CPW transmission lines used in RF and microwave applications
Grounded CPW (GCPW) will have an additional ground plane on the underside of the substrate.  In practice this plane needs to be sufficiently distant from the trace as compared with the side grounds that the system carries a CPW mode rather than a lossy microstrip mode
Ungrounded CPW is more standard, in which the side grounds coplanar to the strip itself provide the only return current path, and the underside of the substrate is unclad.
Finite Ground CPW (FG-CPW) traditionally refers to an ungrounded CPW in which the side ground metalization is of limited width, often not more than 2 – 3 times the width of the center trace itself, due to space considerations.
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刚看到，谢谢回答！

学习呀！能解释得清楚点吗。

学习呀！能解释得清楚点吗。