Abstract
A new hybrid numerical technique, the Space-Spectral Domain Approach (SSDA), has been developed to analyze planar circuit discontinuities. The method combines in one algorithm a space discretization method, the Method of Lines (MoL), with the Spectral Domain Approach (SDA), which is a Fourier domain technique. The SSDA was originally developed as full-wave analysis technique to calculate resonant frequencies of planar circuits and has recently been extended to include self-consistent hybrid boundary conditions to calculate also scattering parameters of arbitrarily shaped circuit discontinuities. A deterministic quasi-static SSDA has also been developed very recently to provide a quick first order design response. This paper focusses on the development of the quasi-static SSDA to introduce the basics for this algorithm. Theoretical data for conductor backed coplanar transmission lines will be presented and the accuracy of the method compared with measurements.
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