SIMULATION-MODELS OF A DISSIPATIVE TRANSMISSION-LINE ABOVE A LOSSY GROUND FOR A WIDE-FREQUENCY RANGE .1. SINGLE CONDUCTOR CONFIGURATION

The simulation model of asingle conductor dissipative line above a los sy ground, based on the exact formulation of the Maxwell equations, is proposed for a wide frequency range, The transmission-line (TL) and f ast-wave (FW) propagation constants of the line are computed by solvin g the modal equation coming from the continuity of the tangential comp onent of the electric field at the air-wire interface, Three different expressions of the distributed line impedance and admittance are sugg ested with reference to different definitions of the line voltage, Mor eover, logarithmic approximations of the Sommerfeld integrals are prop osed in order to obtain an easy-to-implement formulation of the simula tion models for use in computer codes, Comparisons between the propose d models and the Carson approach are carried out with reference to asi ngle conductor line above a lossy earth, considering different values of the line geometrical parameters and ground conductivity and permitt ivity.