RF MODULE

13 Choose Extrude from the Draw menu, and type -0.01 in the Distance edit field.
14 Select all objects and click the Create Pairs and Imprints toolbar button.
SCALAR VARIABLES
In the Application Scalar Variables dialog box (available by choosing Scalar Variables
from the Physics menu), set the Frequency to 6e9.
BOUNDARY CONDITIONS
The default boundary condition is a perfect electric conductor, which is fine for all
exterior boundaries except at the ports. The pair condition between the waveguide and
the coaxial cable is also a port with wave excitation. The excitation enters the
waveguide side because it is the master side of the pair. Only waves reflected back to
the cable enter the slave side.
1 Open the Boundary Settings dialog box from the Physics menu.
2 Click the Pair tab and select the pair in the list.
3 From the Boundary condition list, select the Port boundary condition.
4 Click the Port tab, then select the Wave excitation at this port check box.
5 From the Mode specification list, select Coaxial.
6 Click the Boundaries tab, and select Boundary 15. Select the Port boundary
condition.
7 Click the Port tab and type 3 in the Port number edit field. Then select the coaxial
mode specification also for this port.
8 Click the Conditions tab, select Boundary 12, choose the port boundary condition
again, and then click the Port tab.
9 Type 2 in the Port number edit field, and choose Rectangular from the Mode
specification list.
10 Click OK to close the Boundary Settings dialog box.
SUBDOMAIN SETTINGS
All subdomains keep the defaults value that represents air. The subdomain for the
coaxial cable damps all reflected waves using perfectly matched layers.
1 Open the Subdomain Settings dialog box from the Physics menu.
2 Select Subdomain 2 and click the PML tab.
3 Choose Cartesian from the Type of PML list.
COAXIAL TO WAVEGUIDE COUPLING | 207