How do you plot a Smith Chart in Matlab?

How do you plot a Smith Chart in Matlab?

Plot Impedance Data On Smith Plot

1. Open Live Script.
2. z1 = 0.1*50 + 1j*(0:2:50); z2 = (0:2:50) – 0.6*50j;
3. z0 = 50;
4. gamma1 = z2gamma(z1,z0); gamma2 = z2gamma(z2,z0);
5. s = smithplot(gamma1,’Color’,[0.2 0 1],’GridType’,”Z”); hold on; s = smithplot(gamma2,’Color’,’g’,’LineStyle’,’-.’,’

Why is a Smith chart circular?

The normalised impedance Smith chart is composed of two families of circles: circles of constant normalised resistance and circles of constant normalised reactance. In the complex reflection coefficient plane the Smith chart occupies a circle of unity radius centred at the origin.

How do you plot a circle in Matlab?

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1. function h = circle(x,y,r)
2. hold on.
3. th = 0:pi/50:2*pi;
4. xunit = r * cos(th) + x;
5. yunit = r * sin(th) + y;
6. h = plot(xunit, yunit);
7. hold off.

What can a Smith chart be used for?

The Smith Chart is a fantastic tool for visualizing the impedance of a transmission line and antenna system as a function of frequency. Smith Charts can be used to increase understanding of transmission lines and how they behave from an impedance viewpoint. Smith Charts are also extremely helpful for impedance matching, as we will see.

What’s the difference between smithplot and Smith chart?

The Smith chart is commonly used to display the relationship between a reflection coefficient, typically given as S11 or S22, and a normalized impedance. smithplot(frequency,data) creates a Smith chart based on frequency and data values. smithplot(ax,___) creates a Smith chart with a user defined axes handle, ax, instead of the current axes handle.

How to plot impedance data on Smith chart?

For example, s = smithplot (data,’GridType’,’Z’) displays the impedance data grid from the Smith chart. For a list of properties of smithplot, see SmithPlot Properties. You can use the smithplot interactive menu to change the line and marker styles.

How to draw a circle in Smith chart?

Or, conversely, we can draw a circle by following these steps, here we take as an example: 1 Find the r=2.0 circle in the Smith chart. 2 Locate the cross point of this r circle with coordinate, and we find it’s 0.33. 3 Centered at the origin, draw a circle with radius of 0.33, then it’s the circle. More