Theoretical and experimental characterization of coplanar waveguide discontinuities

This paper describes a new quasi-static technique for the analysis of coplanar and microstrip transmission line discontinuities. The method is a variation of the space-spectral domain approach (SSDA) which represents a novel combination of the 1-D method of lines (MoL) and the 1-D spectral domain approach (SDA). S-parameters and equivalent circuit parameters of abrupt and tapered microstrip and coplanar discontinuities, are calculated. Theoretical results are verified experimentally. A comparison with full-wave methods shows good agreement up to 40 GHz.