Changes
In this tutorial you will revisit the rectangular patch antenna design with a recessed feed, which you explored earlier in Tutorial Lesson 2. This time, however, you will define a design objective and will use [[EM.Picasso]]'s optimization utility to optimize the values of designated design variables to achieve your goal.
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== Getting Started ==
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Click the {{key|'''Add}} ''' button of this dialog to open "Add Objective" dialog. At the bottom of this dialog you will see a list of [[EM.Cube]]'s available standard output parameters. The contents of this list varies vary depending on the observables you have already define defined for your project. Since the wizard created a port definition for this project, you will see a number of standard output parameters related to the S/Z/Y parameters. A design objective is defined as a logical statement:
''expression_1'' ''logical operator'' ''expression_2''
The first and second expressions can be any mathematical expression involving the standard output parameters, variables, Python functions, <i>etc</i>. The logical operators are "==", "<", "<=", ">", ">=" and "!=" (Not Equal To). If you set the mouse focus at one of the expression boxes and then double-click on the name of one of the output parameters in the list, it will be inserted in that box. Set up the following design objective as shown in the figure below:
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Click the {{key|'''Settings}} ''' button next to this drop-down list to open the Optimization Settings dialog.
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Back in the optimization settings dialog, you will see the specifications of the two optimization variables in the table on the right. Set the value of '''Maximum Max Error''' equal to 0.1. This is used for the convergence of the objective function or error function. You can see from the figure below that the error function or "goal" has been defined by the mathematical expression:
|-
| recess_dep
| 13.41384
|-
| recess_wid
| 2.02 02129
|}
Y11: 0.022288 +0.003510j
As you can seefrom the value of the return loss, the specified design goal has been accomplished.
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