Equation Radiation Patterns
Equation patterns are defined as a mathematical function of off axis angle. These are indicated by a symbol next to the pattern name in the list. All the standard ITU patterns are equation patterns.
You can add new Equation gain patterns based on a piecewise function defining the main lobe, sidelobes and backlobe levels. To create a new equation pattern, click . A new pattern will be added to the list and the Custom Equation Pattern dialog will appear.
To define the pattern all you need to do is fill in the blanks.

At the bottom of the dialog, two charts (polar and rectangular plots) provide a preview of what the pattern will look like. As you define the pattern, your changes will immediately be reflected in the charts.
To specify a name for the pattern, click where indicated at the top of the dialog, then type a name when the edit cursor appears, then press return.