Yatpac - The Ultimate Open Source TLM Simulation Package

The Magic-T Junction Filled with a Dielectric

1. Example description

In this example we have computed the electromagnetic field inside the same Magic-T structure as in the previous example of an air-filled Magic-T. In this case the Magic-T is filled with a lossless dielectric material of eps_r = 4. The geometry of the waveguide is shown in Fig. 1. Also in this case, the behavior of the Magic-T junction is investigated by exciting the different ports.

Fig. 1: The model of the Magic-T junction filled with dielectric material.

2. TLM model

The Magic-T structure, excitation-type and simulation setup are given in the TLM model file I3D.filledmTp1, I3D.filledmTp3 and I3D.filledmTp4. Each file corresponds to a different port excitation. The structure is excited with a Gaussian pulse and absorbing boundary conditions are used at the boundaries of the simulation domain.

3. Simulation Results

3.1 Electromagnetic Fields Visualization

The sequence and the visualization type are analogous to the case of air-filled Magic-T and the description is reported here for more convenience. In Fig. 2 we display a snapshot of the electric field magnitude |E| while port 1 is excited. In Fig. 3 we display a snapshot of the electric field distribution in vector representation while port 1 is excited. In Fig. 4 we display a snapshot of the electric field magnitude |E| while port 3 is excited. In Fig. 5-6 we display a snapshot of the electric field distribution in vector representation while port 3 is excited from two different views. In Fig. 7 we display a snapshot of the electric field magnitude |E|while port 4 is excited. In Fig. 8 we display a snapshot of the electric field distribution in vector representation while port 4 is excited.

Fig. 2: Snapshot of the electric field magnitude |E| with excitation at port 1..

Fig. 3: Snapshot of the electric field distribution in vector representation with excitation at port 1.

Fig. 4: Snapshot of the electric field magnitude |E| with excitation at port 3.

Fig. 5: Snapshot of the electric field distribution in vector representation with excitation at port 3.

Fig. 6: Snapshot of the electric field distribution in vector representation with excitation at port 3 from a different view.

Fig. 7: Snapshot of the electric field magnitude |E| with excitation at port 4.

Fig. 8: Snapshot of the electric field distribution ino vector with excitation at port 4.