ABSTRACT
An easy methodology for constructing diagrams showing the electric lines of force and equipotential surfaces of different charge distributions was presented more than one century ago. Since then, many techniques have been used to simulate all sorts of electromagnetic phenomena. These techniques can be separated into: analytical, graphical, circuital, experimental, statistical, numerical, and those based on analogies. Among the numerical techniques, the following ones are recognized: the finite-difference spatial-domain (FDSD) method; the waveguide model (WGM), 1955; the generalized scattering matrix (GSM) technique, 1963; the method of moments (MoM), 1964; the method of lines (MoL), 1965; the finite-difference time-domain (FDTD) method, 1966; the mode matching method (MMM), 1967; the spectral domain approach (SDA), 1968; the finite-element (FE) method, 1968; the transmission line matrix (TLM) method, 1971; the integral-equation (IE) method, 1977; the finite-integration technique (FIT), 1977; the transverse resonance technique(TRT), 1984; and the generalized multipole technique (GMT), 1990. All these techniques can be divided into two groups: domain and boundary methods.
