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Microwave Transmision Lines

UNIT- 1 : MICROWAVE TRANSMISION LINES - LECTURE 8

USING SMITH CHART FOR ADMITTANCE CALCULATION:

Using Smith Chart for calculation of Admittance:

• First, locate the normalized impedance on the chart for ZL = 50 + j100

• Then draw the circle through the point

• The circle gives us the reflection coefficient (the radius of the circle) which can be read from

the scale at the bottom of most charts

• Also note that exactly opposite to the normalized load is its admittance. Thus, the chart can also

be used to find the admittance. We use this fact in stub matching.

• Now the line is matched to the left of the stub because the normalized impedance and admittance are equal to 1

• Note that the point on the Smith Chart where the line is matched is in the center (normalized z=1) where also

the reflection coefficient circle has zero radius or the reflection coefficient is zero.

• Thus, the goal with the matching problem is to add an impedance so that the total impedance is the

characteristic impedance.

NUMERICALS ( PROBLEMS) :

Microwave Transmision Lines