Matching using short-circuit stub

We try to match the output of the amplifier to a 20 m termination.

The matching network design procedures

1. Locate normalised admittance for on the Smith chart as point . Since . The normalised admittance should be at .
2. With a section of 50 line, convert the admittance until it has unity normalised conductance, point A as the Figure shown, i.e. Transfer the admittance, toward the generator, until it meets the unity conductance circle.
3. Add a parallel short-circuit stub section to cancel the susceptive part, i.e., Transfer from short-circuit to point B, toward the generator.

 
Figure 20: Output matching design with the aid of Smith chart