Coaxial Cables Italian
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Schematic representation of the elementary component of a transmission line.The transmission line model represents the transmission line as an infinite series of two-port elementary components, each representing an infinitesimally short segment of the transmission line:
The distributed resistance R of the conductors is represented by a series resistor (expressed in ohms per unit length). Coaxial Cables Italian
The distributed inductance L (due to the magnetic field around the wires, self-inductance, etc.) is represented by a series inductor (henries per unit length). Coaxial Cables Italian
The capacitance C between the two conductors is represented by a shunt capacitor C (farads per unit length).
The conductance G of the dielectric material separating the two conductors is represented by a conductance G shunted between the signal wire and the return wire (siemens per unit length). Coaxial Cables Italian
The model consists of an infinite series of the elements shown in the figure, and that the values of the components are specified per unit length so the picture of the component can be misleading. Coaxial Cables Italian R, L, C, and G may also be functions of frequency. An alternative notation is to use R', L', C' and G' to emphasize that the values are derivatives with respect to length. These quantities can also be known as the primary line constants to distinguish from the secondary line constants derived from them, these being the propagation constant, attenuation constant and phase constant.
