SIMULATION-MODELS OF A DISSIPATIVE TRANSMISSION-LINE ABOVE A LOSSY GROUND FOR A WIDE-FREQUENCY RANGE .2. MULTICONDUCTOR CONFIGURATION

The simulation model of a multiconductor dissipative line above a loss y ground, based on the exact formulation of the Maxwell equations, Is proposed for a wide frequency range, The procedure is an extension of the analysis of single conductor configurations, The exact expression of the matrix modal equation of the line is first proposed, assuming t hat in the system there are as many dominant discrete modes of propaga tion as there are conductors, New expressions of the distributed serie s-impedance and shunt-admittance matrices are proposed, with reference to the definition of the wire-to-ground voltage, Moreover, an easy-to -implement simulation model is proposed for use in computer codes, bas ed on the logarithmic approximation of the Sommerfeld integrals and Be ssel functions, Applications are carried out in order to compare the r esults of the proposed procedure and of the Carson theory, with refere nce to a three-conductor line above a lossy ground.