Subdividing a Model Using Non-Radiating Networks

Calculate the input impedance of a circularly polarised patch antenna fed through a microstrip branch coupler. Replace the branch coupler with a non-radiating network and compare with a full solution.

Figure 1. 3D view of the patch antenna with feed network.

Follow the steps below to solve the model:
  1. Solve the S-parameters of the feed network separately and export to a Touchstone file.
  2. Use the Touchstone file in a non-radiating network to feed the two input ports directly connected to the patch.
  3. Solve the full model of the feed network and patch together.
  4. Compare the results between the full model and subdivided model.