Lecture 5 : Standing Waves on Transmission Line & Impedance Transformation
Voltage Reflection Co-efficient and its Relation to Load Impedance
As a measure of reflected energy we define a quantity called ' Voltage Reflection Coefficient ' as
Impedance seen at any distance
from the load in terms of the ' Reflection Coefficient ' then is
Inverting the relation we get the reflection coefficient at any point on the line which is at a distance from the
load is
Now at
, the impedance
. Therefore the reflection coefficient at the
load end of the line is
Interesting to Note
The transmission line provides a medium of impedance
for the energy flow. Any departure from
creates
an impedance step. This impedance step disrupts the smooth flow of energy and the part of the energy is reflected.
Larger the impedance step more is the reflected energy and higher the reflection coefficient.
from the load in terms of the ' Reflection Coefficient ' then is 
, the impedance
. Therefore the reflection coefficient at the
load end of the line is 
for the energy flow. Any departure from
