RF MODULE

The probe plotting leaves an open figure window when the final step is done, so you
should have one from the first sweep showing the S-parameters without any applied
force. To compare this S-parameter curve with the ones with stress you just plot the
S-parameters in the old figure and keeping the old plot. The steps below assume that
the S-parameter plot without force is in the plot labeled Figure 1.
9 From the Postprocessing menu, open the Global Variables Plot dialog box.
10 Choose the variables S-parameter dB (S11) and S-parameter dB (S21) from the
Predefined quantities list. Then add them to the Quantities to plot list by clicking the
> button.
11 Select the Keep current plot check box, and choose Figure 1 from the Plot in list.
12 Click the Line Settings button.
13 In the dialog box that appears, choose Plus sign from the Line marker list Click OK
to close the dialog box.
14 Click OK to see the comparison shown in Figure 3-32 on page 171.
182 | CHAPTER 3: RF AND MICROWAVE MODELS