Yatpac - The Ultimate Open Source TLM Simulation Package

The Magic-T Junction

1. Example description

In the following example a Magic-T junction realized with a standard hollow waveguide of R320 type waveguide is simulated (see Fig. 1). The cross-sectional dimensions of the waveguide are w = 7.112 mm and h = 3.556 mm, where w denotes the width and h denotes the height of the waveguide. The behavior of the Magic-T junction is investigated by exciting the different ports.

Fig. 1: The hollow Magic-T junction.

2. TLM model

The Magic-T structure, excitation-type and simulation setup are given in the TLM model files I3D.magicTp1, I3D.magicTp3 I3D.magicTp4. In the first file, port1 is excited, the second port 3 and the forth port 4.

In the first file the structure is excited with a Gaussian signal. The excitation is modeled by a vertically polarized electric field at one port of the waveguide as shown in Fig. 1. Absorbing boundary conditions are used at the boundaries of the simulation domain.

3. Simulation Results

3.1 Electromagnetic Fields Visualization

As simulation results, 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 we display a snapshot of the electric field distribution in vector representation while port 3 is excited. In Fig. 6 we display a snapshot of the electric field magnitude |E|while port 4 is excited. In Fig. 7 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 magnitude |E| with excitation at port 4.

Fig. 7: Snapshot of the electric field distribution in vector with excitation at port 4.