RF MODULE

38 | CHAPTER 2: TUTORIAL MODELS
Subdomain Settings
Use the default values for ε r, µ r, and σ, because the waveguide is filled with air.
PHYSICS SETTINGS—OPTIMIZATION
Scalar Settings
1 From the Multiphysics menu, select the Optimization (opt) application mode.
2 Choose Scalar Settings from the Physics menu.
3 In the Scalar Settings dialog box, on the Objective page, enter S11_rfwe for Q s.
4 On the Scalar Constraints page, enter dL as Expression and set upper and lower
bounds (ub and lb) to 0.01 and 0.03 respectively.
5 On the Variables page, enter dL for Variable and 0.014 for Init.
6 Click OK.
MESH GENERATION
To resolve the waves, you need to use a finer mesh than the default.
1 From the Mesh menu, open the Free Mesh Parameters dialog box.
2 Click the Custom mesh size button, and set the Maximum element size to 3e-3.
3 Click OK.
4 Initialize the mesh by clicking the Initialize Mesh button on the Main toolbar.
COMPUTING THE SOLUTION—SENSITIVITY
1 In the Solver Parameters dialog box, select the Optimization/Sensitivity check box.
2 Set the Linear system solver to Direct (PARDISO).
3 In the Solver Parameters dialog box, select the Parametric solver.
4 Enter dL as Parameter names and range(0.01,0.001,0.032) as Parameter values.
This instructs the solver to calculate the solution at a number of equidistant wall
positions in the range 0.01 m to 0.032 m from the outer corner.
5 Click the Optimization/Sensitivity tab.
6 Set the Analysis to Sensitivity.
7 Click the Advanced tab.
8 Select the Use complex functions with real input box.
9 Click OK.
10 Click the Solve button on the Main toolbar to compute the solution.