A Smith Chart is essentially a polar plot of the voltage reflection coefficient typically encountered in electromagnetic transmission line problems. A Smith Chart is used extensively when designing in microwave circuits.
The real utility of the Smith Chart, however, is in its ability to convert reflection coefficients to/from normalized impedances (admittances).
This is accomplished through the conformal mapping of the normalized impeadance (admittance) plane in rectangular coordinates, into constant resistance/reactance contours (circles and arcs) in the polar, reflection coefficient plane.
The relationship between the reflection coefficient, Gamma, and the normalized impeadance, z, is: (1) Gamma = (z - 1)/(z + 1), where z = Z/Zo (Re(Z) >= 0), Zo is the characteristic impeadance of the system, or some reference impeadance. and, (2) z = r + jx, where r is the normalized resistance, and x the normalized reactance.
The Smith Chart Module will plot reflection coefficient data (i.e., S11 and S22 S-parameters), and/or normalized impeadance data (normalized admittance capability will be incorporated in the next version), expressed in polar form (magnitude and phase), in a Smith Chart with constant normalized resistance circles of r = 0.5, 1.0 and 3.0, and constant normalized reactance contours of x = +/-0.5, +/-1, and +/-3.
Simply load the module into pro Fit, using the "Customize -> Load Module..." menu item, open an appropriate data set, choose the "Prog -> SmithChart" menu item, and select the desired options.
Requirements:
· pro Fit
