chapter  15

Transmission Lines

WithThomas Koryu Ishii

The equivalent Circuit of a generic transmission line in monochromatic single frequency operation is shown in Figure 15.1 [1-3], where Z ˙ is a series impedance per unit length of the transmission line (Ω/m) and Y ˙ is a shunt admittance per unit length of the transmission line (S/m). For a uniform, nonlinear transmission line, either Z ˙ or Y ˙ or both Z ˙ and Y ˙ are functions of the transmission line voltage and Current, but both Z ˙ and Y ˙ are not functions of location on the transmission line. For a nonuniform, linear transmission line, both Z ˙ and Y ˙ are functions of location, but not functions of voltage and Current on the transmission line. For a nonuniform and nonlinear transmission line, both Z ˙ and Y ˙ or Z ˙ or Y ˙ are functions of the voltage, the Current, and the location on the transmission line. Equivalent Circuit of a generic transmission line.