 Second-order transmission line Equations

EM-THEORY
REFERENCES:
1. M.N.O. Sadiku: Elements of Electromagnetics, Second Edition,
Oxford University Press, 1995.
2. P.Lorrain & D. Corson: Electromagnetic Fields and Waves, Second
Edition, W.H. Freeman & Co, New York, 1970.


Lecturer: Dr. Thomas Afullo,
School of Electrical, Electronic & Computer Engineering,
University of Kwazulu-Natal,
Durban, South Africa.
Tel: +27-31-260 2713; E-mail:


Transmission Lines and EM THEORY 1
Smith Chart

, TRANSMISSION LINES &
IMPEDANCE MATCHING
LOSSLESS TRANSMISSION LINE
In many practical transmission lines, the loss of the line is very small –
hence the line may be considered as a “lossless” line.
In such a case, R=0, and G=0; hence, from (16):
 2  RG   2 LC   j RC  LG    2 LC
24
     LC  j LC
2


But :     j  j LC
25
  0;    LC
From (23):

( R  jL) jL
Zo   
L
26
(G  jC ) jC C


Transmission Lines and EM THEORY 2
Smith Chart