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HFSS15: Adding a Design Variable
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HFSS online help > Working with Variables
A design variable is associated with an HFSS design. A design variable can be assigned to a parameter value in the HFSS design in which it was created. You can also add a variable defined with an array of values.
1. Click HFSS or HFSS-IE>Design Properties.
• Alternatively, right-click the design name in the project tree, and then click Design Properties on the shortcut menu.
The Local Variables Properties dialog box appears. From the Properties dialog you can Add, Add Array, Edit.. or Remove variables. This section describes Add. Use the links for descriptions of Add Array, .Edit and Remove,
Any existing Design variables are listed in the Properties dialog with the name followed by cells for Value, Unit, Evaluated Value, Type, Description, and Read-only and Hidden check boxes. A Show Hidden checkbox on the lower right of the Properties dialog controls the appearance of any Hidden variables .
Initially, you leave the radio button with Value selected until you have defined a variable. The other radio buttons let you enable defined variables for Optimization, Tuning, Sensitivity or Statistics. Selecting one of these radio buttons add a new column to the Variable definition row for which you can check or uncheck Include for regular variables for that kind of Optimetrics simulation. For further discussion, see Optimetrics.
2. Click Add.
The Add Property dialog box appears.
3. In the Name text box, type the name of the variable.
Variable names must start with a letter, and may include alphanumeric characters and underscores ( _ ). The names of intrinsic functions and the pre-defined constant pi (p) cannot be used as variable names.
You can sort the project variables by clicking on the Name column header. By default, variables are sorted in original order. Clicking once sorts them in ascending order, noted by a triangle pointing up. Clicking against sorts in descending order, noted by a triangle pointing down. Clicking a third time sorts in original order, with no triangle.
4. Select a radio button for the variable use:
Selected Use | Setable Properties |
Variable | Unit Type, Units, Value |
Array Index Variable | Associate Array variable, Value |
Separator | Value |
Post Processing Variable | Unit Type, Units, Value |
Each selection affects the settable options.
5. In the Unit Type text box you can use the drop down menu to select from the list of available unit types. “None” is the default.
When you select a Unit Type, the choices in drop down menu for the Units text box adapt to that unit type. For example, selecting Length as the Unit Type causes the Unit menu to show a range of metric and english units for length. Similarly, if you select the Unit Type as Resistance, the Units drop down lists a range of standard Ohm units.
6. In the Value text box, type the quantity that the variable represents. Optionally, include the units of measurement.
Note | If you include the variable’s units in its definition (in the Value text box), do not include the variable’s units when you enter the variable name for a parameter value. |
The quantity can be a numerical value, a mathematical expression, or a mathematical function. The quantity entered will be the current (or default value) for the variable. If the mathematical expression includes a reference to an existing variable, this variable is treated as a dependent variable. The units for a dependent variable will automatically change to those of the independent variable on which the value depends. Additionally, dependent variables, though useful in many situations, cannot be the direct subject of optimization, sensitivity analysis, tuning, or statistical analysis.
Note | Complex numbers are not allowed for variables to be used in an Optimetrics sweep, or for optimization, statistical, sensitivity or tuning setups. |
7. Click OK.
You return to the Properties dialog box. The new variable and its value are listed in the table. If the value is an expression, the evaluated value is shown. Updating the expression also changes the evaluated value display. Any dependent variables also have evaluated values changed.
8. Optionally, type a description of the variable in the Description text box.
9. You can designate a variable as Read-only, Hidden, or Sweep. You may need to use the scroll bar or resize the dialog to view the check boxes.
The Sweep checkbox lets you designate variables to include in solution indexing as a way to permit faster post processing. Variables with Sweep unchecked are not used in solution indexing. If a solution exists, checking or unchecking a variable’s Sweep setting produces a warning that the change will invalidate existing solutions. To continue, click OK to dismiss the warning dialog.
If a variable has dependent variables, the Sweep checkbox is disabled and cannot be changed.
10. Click OK.
The new variable can now be assigned to a parameter value in the design in which it was created.
