Impedance Graph
Add an Impedance Graph subnode () to a Smith Plot Group node to create an impedance Smith plot. After defining the expression to plot (an S-parameter, for example), click Plot () to create the impedance Smith plot. If you want to add color to the plotted curve (to represent the frequency, for example) or a filter, add Color Expression or Filter subnodes.
Go to Common Results Node Settings for links to information about these sections: Data, Title, and Coloring and Style.
Expressions
For an Impedance Graph, you can plot multiple curves in the same graph (Smith plot) using varying line styles and colors. In the table in this section, add one or more expressions to the rows under Expression to define the quantity for each curve, and optionally add descriptions under Description. The descriptions appear in the legends.
For this table of expressions, the Replace Expression and Add Expression buttons have the following effect:
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Click the Replace Expression () button to select a predefined quantity and replace the entire contents of the Expression table with the corresponding variable as the only expression.
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Click the Add Expression () button to insert the corresponding variable on a new row in the Expression table.
Enter a reference impedance (SI unit: Ω), if using, in the Reference impedance field.
Legends
The Show legends check box is selected by default to display the plotted expressions to the right of the plot. In plots where each line represents a certain time value, eigenvalue, or parameter value, these values are also displayed.
When Automatic is selected from the Legends list (the default), select or clear the Description, Expression, and Unit check boxes to control what to include in the automatic legends (by default it includes the description only). You can also add a prefix or a suffix to the automatic legend text in the Prefix and Suffix fields. If Manual is selected from the Legends list, enter your own legend text into the table. If Evaluated is selected, you can use the eval function to create an evaluated legend text in the Legend field that include evaluated global expressions such as global parameters used in sweeps. For the numerical evaluation, you can control the precision in the Precision field (default: 3).