Abstract
Abstract This article gives an overview of various coplanar waveguide (CPW) transmission lines developed to date for promising applications in monolithic microwave integrated circuits (MMICs). The article begins with a detailed description of the geometric schematics, transmission behaviors, and design formulas for the three basic CPW with infinite‐ and finite‐ground widths as well as backed conductor. Several improved CPW structures with metallic enclosure, vertical‐layer reallocation or varied conductor configurations are outlined, aiming at effectively reducing unexpected losses caused by a strip conductor, lossy substrate, or radiation in addition to problematic crosstalk effects. Coupled CPW transmission lines with different coupling architectures are briefly investigated in terms of coupling or interaction extent. Next, a variety of periodic CPW transmission lines with series inductive and/or shunt capacitive loading are presented and their slow‐wave characteristics are primarily applied for size miniaturization of CPW devices. In conclusion, guided‐wave propagation characteristics of periodic CPW are thoroughly studied in terms of dispersive and complex per unit length transmission parameters.
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