A Study of Time-Domain and Frequency- Domain Techniques in Electromagnetics

Abstract

Before the advent of digital computer, analytical techniques were used for determining idealized solutions of electromagnetic problems, most especially problems of simple geometry or design. When the size of the problem becomes large that the analytical technique is unable to yield solutions of desired accuracy, approximate solutions are sought by using digital computer and numerical technique. This paper examines various numerical techniques suitable for solving electromagnetic problems. It is emphasized in the paper, the strengths and weaknesses of these techniques in tackling a particular problem. Because of the significance of retarded potentials in formulating integral equations that are solved by method of moment technique, effort is also geared towards deriving expressions for these potentials when sources are constrained to the axis, surface and volume of the conducting body.