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.

1. Define the following variables:
• freq = 75e6 (The operating frequency.)
• lambda = c0/freq (The wavelength in free space.)
• groundRadius = 2 (Radius of the ground plane.)
• wireRadius = 1e-3 (Radius of the wire.)
2. Create the circular ground.
1. Create an ellipse.
• Centre point: (0, 0, 0)
• Label: ground
3. Create the monopole.
1. Create a line.
• Start point: (0, 0, 0)
• End point: (0, 0, lambda/4)
• Label: monopole
4. Union ground and monopole.
5. Add a wire port (vertex) to the start of the line.
Tip: Use the port preview to ensure the port is located at the junction between the wire and the ground plane. If the port is not located at the junction, change the port location to End.
6. Add a voltage source to the port. (1 V, 0°, 50 Ω).
7. Set the frequency to freq.
8. Specify the symmetry about 2 principal planes.
• X=0: Magnetic symmetry
• Y=0: Magnetic symmetry
Tip: Exploit model symmetries (if it exists) in a large or complex model to reduce computational costs.