Near-field computation using the finite element method.

Abstract

This thesis introduces techniques of analysis of electromagnetic wave propagation problems that can be used in the computation of near field using the Finite Element Method. The techniques are usable in situations involving three-dimensional structures as well as those exhibiting axial symmetry. For three-dimensional structures vector finite element formulation is employed for the computation of both magnetic and electric field vectors. For the axisymmetric configurations nodal finite element method has been implemented in modelling coaxially driven structures. The methods are used to model problem configurations involving structures of interest in the field of EMI/EMC and antennas, such as a dielectric ring resonator antenna, coaxial junctions and a cylindrical monopole antenna. The modelling is done in frequency domain and the results of the modelled structures are provided. A neural network approach to the solution of electromagnetic field problems is also introduced. The results compare well with the published experimental as well as theoretical results obtained on the same structures.