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This paper describes the development and application of sophisticated multi-conductor cable bundle models for Spice simulation. The cable models developed include frequency dependent parameters, transfer impedance coupling and incident plane wave excitation. The models may be used in frequency domain or transient simulations and are intended for EMC/ EMI studies. Simulations of realistic scenarios...
An application of a decoupling and power matching scheme for near-field MIMO communication using arrays of dipole antenna beyond the 2×2 case is demonstrated. The application of the decoupling and power matching procedure introduces intermediary networks between the generator and the receiver load to allow the creation of strong (non-interfering) channels. Implementing these networks leads to an increase...
This paper discusses how the measurements of the near-field emissions in the time domain can be used to characterize the broadband emissions from complex sources such as multifunctional Printed Circuit Boards (PCBs). The near-fields, transverse to the measurement surface, are sufficient to characterise the radiator provided the surface contains all the significant fields. For time domain measurements,...
This paper describes the progress of work towards an Open Source software toolset suitable for developing Spice based multi-conductor cable models. The issues related to creating a transmission line model for implementation in Spice which include the frequency dependent properties of real cables are presented and the viability of spice cable models is demonstrated through application to a three conductor...
Matrix converters have been recently proposed as an alternative solution to the standard back-to-back converter in aerospace applications. However, Electromagnetic Interference (EMI), in particular, conducted emissions represent a critical aspect for this converter family. Direct Matrix Converter (DMC) are usually modelled only at the normal operating frequency, but for the research presented in this...
In this paper, a method for representing electromagnetic emissions from a printed circuit board (PCB) using an equivalent dipole model deduced from time domain near-field scanning magnetic field measurements is proposed. The basic idea is to replace the PCB with a set of infinitesimal dipoles that generate the same radiated fields. Parameters of the time dependent equivalent dipoles are determined...
A method of modelling corona discharge around a thin-wire is demonstrated using the Transmission-Line Modelling (TLM) approach. In particular, the embedded 3-D node is utilised; a node that allows for field-wire and wire-field coupling. A demonstration of the typical effects experienced by a surge waveform travelling on a transmission line is used to validate the method.
In full field CEM analysis the maximum frequency obtained is commonly imposed by a dispersion (phase accuracy) criterion. Thus very large computational resources are required in order to analyse problems many wavelengths long. In this work we demonstrate an approach through the application of frequency scaling that allows the usable bandwidth for over-moded problems to be extended past the traditionally...
The computational demands of modeling a reverberation chamber make it impossible to attempt directly using full field time domain computational electromagnetics techniques. In this paper a random boundary condition for the TLM method is described which has the effect of vastly lowering the resonant frequency and increasing the mode density of a cavity. Models of reverberation chamber tests may be...
A method for characterising and modelling the noisy electromagnetic fields from complex circuit boards using a simplified representation of correlated dipoles is investigated. It is shown how the equivalent dipole model can be constructed from the time domain measurements of the near fields. This equivalent model can then be used to accurately reproduce the emissions from the circuit board in both...
The simulation of modern microwave circuits is achieved using a variety of tools, chief amongst these are full-wave field solvers and behavioral circuit simulators. While the latter has the advantage of simplicity, field phenomena such as multiple random external noise sources, and complex device coupling are difficult to include. A full-wave model on the other hand incorporates these effects, but...
Welcome to York and welcome to EMC Europe 2011. I hope you have a fruitful and successful conference and that you enjoy your stay in our historic city.
The use of field solvers to simulate ICs is advantageous due to the decreasing size of modern electronic components where field effects are a necessary part of the model. Unfortunately, the simulation of complex ICs using only field solvers is computationally expensive due to the fine spatial sampling required. In this paper we will derive an interface to embed a behavioural model of a complex IC...
A procedure is described which allows the wideband characterisation of shielded cables in a form suitable for direct implementation within time domain CEM modelling techniques such as TLM or FDTD. The process is based on the solution of an inverse problem.
Any electric or electronic equipment sold within the European Union has to comply with the EC Directive on Electromagnetic Compatibility (EMC). To achieve compliance, the equipment must be tested for radiated/conducted emissions and immunity. A wide range of national and international testing methods and standards are in force such as the IEC 61000-40-20. However, standards in general lack of describing...
Current technology trends require the utilisation of very high clock rates which have a broad electromagnetic spectrum. Electronic equipment designers require accurate characterisation and optimisation of electrical components, sub-systems and complete systems at frequencies that extend well into the microwave spectrum. This paper aims to assess the state-of-the-art in full field solvers in system...
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