Lecture 10 : Transmisssion Line Calculations Using Smith Chart
(D)
VSWR on the line
As we have seen earlier if the load impedance is not equal to there is a standing wave on the
transmission line. We also know that the maximum impedance seen on the line .
This means that the maximum normalized impedance measured on the line is nothing but
the VSWR, . The task of finding is then very simple. Find the normalized impedance ( ) corresponding
to point T. Then,
Mark the impedance on the Smith chart (P).
Draw the circle with center as the centre of the Smith chart (M) and radius PM.
Mark point T where the circle intersects the
line (
axis) on the right hand side of the Smith chart.
) corresponding
to point T. Then, 
line (
axis) on the right hand side of the Smith chart. 
corresponding to point T. 
