Progress towards Electromagnetic Field Computation from DC to Daylight

Over the past few years several research groups have been investigating the effectiveness of employing either vector potentials or field variables for the solution of the general 3-D eddy current problem (low frequency limit). A number of formulations, some closely related, have been established. The aim of this paper is to present the theory and validation of a general method using vector potentials applicable to problems over the entire frequency spectrum. Results will be given for a range of problems using a general purpose computer code based on the finite element method.