Lecture 10 : Transmisssion Line Calculations Using Smith Chart
(B)
Calculation of Reflection Co-efficient at a Distance from the Load
Let the transmission line be terminated in a load impedance . Let us find the reflection coefficient at a
distance from the load using the Smith chart.
First, mark the load impedance as described in (A)
Draw the constant VSWR circle passing through P.
Rotate the radius vector MP by an angle in the clockwise direction to get to point Q (See Fig ).
Radial distance MQ gives the magnitude of the reflection coefficient, . Angle which the radius vector
MQ makes with the -axis gives the phase of , .
