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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 (Ω/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.




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