Wideband description of the finite-ground coplanar waveguide-type structures with discontinuities

Abstract

Some mathematical models are proposed to accurately describe the frequency-dependent series conductance and susceptance of the discontinuities in various finite-ground capacitive series-connected coplanar waveguides (FGCPWs). These models can predict the wideband self-resonance characteristics in the air gap regions. Also, it is pointed out that the Heinrich's equation is applicable to compute the per-unit-length parameters of the uniform FGCPWs, though it was rarely used in the past 10 years. It is shown that Heinrich's equation can be used to capture the frequency-dependent distributed resistance and inductance in a real chip environment. Using our proposed models with Heinrich's equation, numerical calculations are performed to show the effects of metallization surface conductivity and thickness of both capacitive and inductive series-connected FGCPW geometries on their frequency-dependent series resistances, series inductances and shunt capacitances. © 2007 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2007.