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. Request a standard configuration.
  2. Delete the FEM line ports.
  3. Expand shielded_filter and delete Feed1 and Feed2.
  4. Set the region properties of the two regions back to the default (MoM/MLFMM with surface equivalence principle (SEP) - default).
  5. Delete all horizontally orientated faces, except that of the top of the box, the microstrip line and stub.
  6. Add a planar multilayer substrate (infinite plane) with a conducting layer at the bottom.
    1. Select Plane / Ground.
      • Click Planar multilayer substrate.
      • Thickness (Layer 1): substrate_height
      • Medium (Layer 1): substrate
      • Ground plane (Layer 1): PEC
      • Z value at the top of layer 1: substrate_height
  7. Add microstrip ports to the edges of the feedline (see Figure 1 and Figure 2).

    Figure 1. Microstrip ports were added to the edges of the feedline. Note that the infinite plane is hidden and a cutplane was added to show the port locations.

    Figure 2. Zoomed in 3D view of one of the microstrip ports.
    Tip: The microstrip port connects to a single edge and is only used with infinite substrates. The positive terminal is indicated by the red cylinder in the 3D view.
  8. Set a local mesh size on the microstrip lines (faces) of strip_width/2.