ECE 5317-6351 Microwave Engineering. Fall 2011. Prof. David R. Jackson Dept. of ECE. Notes 2. Smith Charts. Generalized Reflection Coefficient . Recall,. Generalized reflection Coefficient:. Generalized Reflection Coefficient (cont.) . For. Proof:.
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Prof. David R. Jackson
Dept. of ECE
Generalized reflection Coefficient:
Lossless transmission line ( = 0)
Increasing l (toward generator)
Substitute into above expression for Zn(-l ):
Next, multiply both sides by the RHS denominator term and equate real and imaginary parts. Then solve the resulting equations for R and Iin terms of Rn and Xn. This gives two equations.
1) Equation #1:
Equation for a circle in the plane
2) Equation #2:
Equation for a circle in the plane:
Conclusion: The same Smith chart can be used as an admittance calculator.
Same mathematical form as for Zn:
The Smith chart can be used for either impedance or admittance calculations, as long as we are consistent.
As an alternative, we can continue to use the original plane, and add admittance curves to the chart.
Compare with previous Smith chart derivation, which started with this equation:
If (RnXn) = (a, b) is some point on the Smith chart corresponding to = 0,
Then (GnBn) = (a, b) corresponds to a point located at = - 0(180o rotation).
Side note: A 180o rotation on a Smith chart makes a normalized impedance become its reciprocal.
The SWR is given by the value of Rn on the positive real axis of the Smith chart.
At this link
Download the following .zip file
Extract the following files
smith.exe smith.hlp smith.pdf
This is the application file