Marlize Schoeman

Advanced EMC modeling by means of a parallel MLFMM and coupling with network theory

The application of a parallelized multilevel fast multipole method (MLFMM) is described and illustrated through examples for the solution of large scale and complex EMC problems. Furthermore, to reduce the modeling complexity of such EMC problems, we propose a combination of field with network theory to split large problems into smaller sub-problems which can be analyzed individually and then again assembled together by means of network theory.

Tailoring FEKO for microwave problems

In this article we have presented some of the more recent modeling options available in FEKO (waveguide ports, combination with FEM, dielectric GO, PBCs, coupling with networks) that are specifically useful to the microwave engineer. In addition to presenting some of the theory, we focused on examples to show the application of each method and discussed their advantages. The examples were kept intentionally simple such that the relevant advantages can easily be highlighted.

Method of moments accelerations and extensions in FEKO

This paper introduces several extensions and accelerations to the Method of Moments (MoM) formulation in the computer code FEKO, which all aim in solving large problems faster or using less memory.

Improving the convergence and parallel memory efficiency of the MLFMM in FEKO

This paper summarizes the latest extensions to the multilevel fast multipole method in the commercial code FEKO: stabilisation and the use of IVIPI shared-memory programming.

Review of the latest feature additions to the electromagnetic solver FEKO

The numerical algorithms in the electromagnetic field solver FEKO are under constant development to add new methods or to improve the existing ones. In this paper we present a selection of the most recent extensions, namely the introduction of curvilinear wire segments in the MoM and MLFMM solvers (complementing the already available curvilinear surface meshes), the modeling of 3D anisotropic materials in the FEM and FDTD solvers, and the extension of the integrated cable harness modeling to also include the Vance model for braided shields (in addition to Kley and Schelkunoff).

New developments in FEKO Suite 6.0 –: Aperture modeling, SPICE Sub-Circuit integration, Shielding Extensions, GPU computing

This paper introduces some of the latest extensions and improvements to the field computation package FEKO: Support for aperture modeling in the planar multilayer Greens function using magnetic surface currents, the integration of SPICE subcircuits in combination with electromagnetic models, accurate shielding computations in the modeling of geometrically thin lossy layers and acceleration by GPUs. These topics are presented and discussed along with validation and application examples.

Comparative study on adaptive rational macromodels of highly resonant structures: Research Articles

The new generation of System-on-Chip (SoC) incorporates digital, analogue, RF/microwave and mixed-signal components. Such circuits impose to reconsider the traditional design methods. Mixed-signal designers need novel design methodologies which will have to include accurate behavioral libraries of devices and processes into hierarchical design flows. Thus, this paper describes a behavioral modeling approach which generates neuro-fuzzy-based models for RF/microwave devices. The models, so obtained, can be easily integrated into a VHDL-AMS simulator. This modeling approach is applied to a microwave tunable phase shifter and it is illustrated by the development of a VHDL-AMS model library for RF/microwave applications.