Exploiting Port Response for Multimode Wideband Analysis of Lossy Devices

This article presents a method to derive a compact model for the wideband analysis of multimode lossy (and lossless) microwave devices and antennas. The model is built from the generalized scattering matrix (GSM) of the structure computed at a set of arbitrarily chosen frequency points in the bandwidth of interest. The set of points can be increased iteratively until the required accuracy is achieved. The method is robust and accurate and, although it is the extension of a previous work by the authors, the presence of losses requires a completely different approach, since the unitarity of the scattering matrix does not hold. The compact model can be applied independently of the numerical technique used to solve the structure. For validation, different examples are presented using proprietary software and commercial software that use both the finite element method (FEM) and the method of moments (MoM).