Creating the Model
Create the model in CADFEKO. Define any ports and sources required for the model. Specify the operating frequency or frequency range for the model.
- Set the model unit to millimeters.
-
Define the following variables:
- a1 = 15.8 (width of Ku section.)
- b1 = 7.9 (height of Ku section.)
- l1 = 12 (length of Ku section.)
- a2 = 22.9 (width of X section.)
- b2 = 10.2 (height of X section.)
- l2 = 12 (length of X section.)
- fmin = 9.4872e9 (minimum calculation frequency.)
- fmax = 15e9 (maximum calculation frequency.)
Note: fmin is just above the cutoff frequency for the Ku band waveguide section. -
Create the Ku band section.
-
Create the X band section.
- Union both cuboids.
-
Set the both regions to free space.
Tip: Free space changes the region from solid PEC to vacuum.
-
Simplify the part with the simplify tool.
Tip: The simplify tool removes the face at the junction between the two cuboids. Alternately, use face selection to delete this face.
- Rename the face at the end of the Ku band section to Port1 and at the X band section to Port2.
-
Add waveguide ports to the faces with labels Port1 and
Port2.
Tip: For accurate phase results set the reference vector with the same orientation for both ports. This is not required for the magnitude.
- Check that the propagation direction of each port is set inwards.
-
Set the frequency.
- Continuous interpolated range.
- Start frequency (Hz): fmin
- End frequency (Hz): fmax
Tip: Set symmetry to save computational resources.