The open-circuit stub location in wavelengths from the amplifier load interface is a function of the clockwise angular difference between point 'A' and GammaL. 'BackgroundColor', 'Position',)Īnnotation(container, 'arrow',) Calculate the Stub Location and the Stub Length for the Output Matching Network 'HorizontalAlignment', 'center', 'FontSize',8. These reflection coefficients are measured at the amplifier interfaces.Ĭircle(amp,freq, 'Gamma',abs(GammaL),hsm) Calculate and Plot the Complex Load and Source Reflection CoefficientsĬalculate and plot all complex load and source reflection coefficients for simultaneous conjugate match at all measured frequency data points that are unconditionally stable. This example uses the YZ Smith chart because it's easier to add a stub in parallel with a transmission line using this type of Smith chart. Smith Charts are also extremely helpful for impedance matching, as we will see. Smith Charts can be used to increase understanding of transmission lines and how they behave from an impedance viewpoint.

At this location, the stub will negate the transmission line susceptance, resulting in a conductance that equals the load or source terminations. The Smith Chart is a fantastic tool for visualizing the impedance of a transmission line and antenna system as a function of frequency. Movement along a transmission line is equivalent to traversing a circle centered at the origin of the Smith chart with radius equal to a reflection coefficient magnitude.Ī single transmission line stub can be inserted at the point on a transmission line when its admittance (transmission line) intersects the unity conductance circle. The center of the Smith chart represents a normalized source or load immittance.

Smith chart series shunt