RF MODULE

SETTINGS BOUNDARIES 9, 11,
14
Port phase 0 pi
Mode specification Coaxial Coaxial 0
SETTINGS BOUNDARIES 60, 70
Boundary condition Perfect electric conductor
2 Select Boundaries 26, 28, 30, 32, 120, 122, 124, and 125. On the Far-Field page
type Efar in the first row of the Name column and let the other columns have the
default values.
3 Click Apply and leave the Boundary Settings dialog box open. A special variable is
needed later to plot all the metal objects in the geometry. Use the boundary settings
to select all boundaries with the Perfect electric conductor condition. Mark
Boundary 60 and then select the Select by group check box. All metal boundaries
should now be selected. Click OK.
4 Go to the Options menu and select Expressions>Boundary Expressions.
5 In the Boundary Expressions dialog box, add the variable boundary_plot and type
1 in the Expression column.
6 Select Boundaries 58, 59, 61, 65, 71, 73, 74, 101, 141, and 142. Type 2 in the
Expression column for the boundary_plot variable.
7 Select Boundaries 1, 3, 5, 7, 92, 93, 111, and 113. Clear the Expression column for
the boundary_plot variable.
8 Click OK.
Subdomain Settings
1 From the Physics menu, open the Subdomain Settings dialog box and enter the
following settings:
SETTINGS SUBDOMAINS 2–4, 7–9 SUBDOMAIN 6 ALL OTHERS
ε r epsilonr_coax epsilonr_pcb 1
µ r 1 1 1
2 Select Subdomain 1, click the PML tab, and select Spherical from the PML type list.
3 Enter lambda0_rfw in the Width in r direction edit field.
The default value that you removed is equal to the actual width of the PML. Using
that value adjusts the PML design so that one wavelength fits into the width of the
PML. Using the free-space wavelength, λ 0 , instead makes the program assume that
196 | CHAPTER 3: RF AND MICROWAVE MODELS
BOUNDARIES 99,
100, 105
BOUNDARIES 2, 4, 6, 8,
112, 114, 123, 126