Loading....

# Transmission Line Parameters

A transmission line can be characterised by four parameters:
1. Resistance

The resistance of a transmission line is uniformly distributed throughout the entire length of the transmission line. The value of the resistance depends upon the cross-sectional area of the line. This resistance is generally expressed as resistance per unit length (Î©/m).
2. Inductance

When the conductors of a transmission line carry some currents, the magnetic flux linkages per unit current gives the inductance of the line. This inductance is also not a lumped parameter, but is uniformly distributed along the entire length of the line. This is also expressed as henry/m.
3. Capacitance

Capacitance exists between the parallel conductors of a transmission line separated by an insulating medium. This capacitance is also not a lumped parameter, but is uniformly distributed along the entire length of the line. This is also expressed as farad/m.
4. Conductance

Because of the lossy nature of the insulating medium, some amount of leakage current (displacement current) flows through it and this gives rise to the conductance of a transmission line. This conductance is uniformly distributed along the entire length of the length. This is also expressed as mho/m.