Im plotting results on a Z-Smith, which i thought should give me Re (Z)1 (normalized). To read off the VSWR on the line, note the intercept of the VSWR circle with the right-half zero reactance line (it is the horizontal line that bisects the top and bottom of the chart. sp analysis with a simple setup-port set to 100ohm, with 100ohm load. Smith chart is composed of impedance (Z) or admittance (Y) circles of constant. While the latter appears to be straightforward, the only way I can think of for the former is plotting a group of closely spaced points, which becomes quite memory intensive. Smith Chart ( ZL Zo, or L 0 ) and construct a circle through zL. There are two Smith charts Y and Z (admittance and resistance). This unique type of chart was developed by Philip Smith at Bell Telephones Radio Research Lab in the 1930s. These options are available for polar plots only. For my class, I have been trying to plot constant resistance and reactance curves on the Smith chart. A Smith chart is a type of graph used to plot the normalized impedance of a circuit, a circuit element, or an interconnect. In this dialog, you can modify the view of the polar plot or Smith chart.