Sonnet User's Guide - Sonnet Software

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<strong>Sonnet</strong> User’s <strong>Guide</strong> ments (S 21 and S 11 for example). Each measurement would use a different symbol, but each parameter combination with a measurement would use the same symbol. An example is pictured below. In the beginning, the goal of the filter design was stated as a stopband between 5.0 and 6.0 GHz. By looking at the graph of Lstub=120 as compared to Lstub=280, you can see that a filter with the required stopband would fall approximately in the middle of the two curves. So a value of 220 mils is chosen for the nominal value for Lstub for the optimization. A nominal value of 220 mils is chosen for Sstub. Optimization This next section of the tutorial shows how to set up and execute an optimization. For a detailed discussion of optimization, please refer to "Optimization" on page 172. If par_dstub.son is not still open in the project editor, open the file in the project editor. 172
Chapter 11 Parameter Sweep and Optimization Tutorial Entering New Nominal Values Usually for this type of circuit, you would optimize using both of the defined parameters, Lstub and Sstub, but for the sake of processing time, the optimization only uses one parameter, Lstub. The nominal value used for Sstub will be 220 mils. This was arrived at by actually executing the optimization using both parameters and using the closest value on the grid of the optimized parameter. 26 Double-click on the parameter Sstub in the circuit. The Parameter Properties dialog box for Sstub appears on your display. 27 Change the nominal value in the Nominal text entry box to 200. 28 Click on the OK button to close the dialog box and apply the new nominal value. The circuit is redrawn using the new nominal value for Sstub. ! WARNING It is recommended that you change the nominal value of dimension parameters by using the properties dialog box, since changing your nominal value this way does not affect any previous response data in your project file. If you change the nominal value of the dimension parameter by changing the circuit through editing commands, such as a reshape, all previous response data is deleted from the project file when you save. Setting Up an Optimization 29 Select Analysis ⇒ Setup from the main menu of the project editor. The Analysis Setup dialog box appears on your display. 173
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