Title :
Modeling of some coplanar waveguide discontinuities
Author :
Simons, Rainee N. ; Ponchak, George E.
Author_Institution :
NASA Lewis Res. Center, Cleveland, OH, USA
Abstract :
Lumped equivalent circuit models for several coplanar waveguide (CPW) discontinuities such as an open circuit, a series gap in the center conductor, and a symmetric step in the center conductor are presented, and their element value are given as a function of the physical dimensions of the discontinuity. The model element values are de-embedded from measured S-parameters, and the effects of the center conductor width and the substrate thickness on the equivalent circuit element values are obtained. The characteristics of a CPW right-angle bend using a compensation technique are presented. The frequency dependence of the effective dielectric constant is measured and compared to computed values.<>
Keywords :
S-parameters; equivalent circuits; permittivity; waveguide theory; waveguides; CPW; S-parameters; center conductor width; compensation technique; coplanar waveguide discontinuities; deembedded parameters; effective dielectric constant; equivalent circuit; frequency dependence; lumped equivalent circuit models; open circuit; right-angle bend; series gap; substrate thickness; symmetric step; Conductors; Coplanar waveguides; Dielectric constant; Dielectric measurements; Dielectric substrates; Equivalent circuits; Frequency dependence; Frequency measurement; Thickness measurement; Waveguide discontinuities;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
