R320 Waveguide with a 90 Degree Bend Filled with a Dielectric Material

1. Example description

In this example we have computed the electromagnetic field inside the same waveguiding structure as in the previous example of an air-filled waveguide. In this case the waveguide is filled with a lossless dielectric material of eps_r = 4. The geometry of the waveguide is shown in Fig. 1.

Fig. 1: Layout of the rectangular waveguide.

2. TLM model

The waveguiding structure, excitation-type and simulation setup are given in the TLM model files I3D.gaus_filled and I3D.sin_filled.

In the first file the structure is excited with a Gaussian signal and in the second file with a windowed sinusoidal 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 Field Visualization

In Fig. 2 and 6 the absolute value of the electric field vertical component |Ez| for the Gaussian excitation and for the sinusoidal excitation are shown. In Fig. 3 and 5 the absolute value of the electric field vertical component |E| for the Gaussian excitation and for the sinusoidal excitation are shown. In Fig. 4 and 7 the absolute value of the Poynting |P| for the Gaussian excitation and for the sinusoidal excitation are shown.

Fig. 2: The electric field vertical component |Ez| for the Gaussian excitation.

Fig. 3: The electric field vertical component |E| for the Gaussian excitation.

Fig. 4: The absolute value of the Poynting vector |P| for the Gaussian excitation.

Fig. 5: The electric field vertical component |E| for the sinusoidal excitation.

Fig. 6: The electric field vertical component |Ez| for the sinusoidal excitation.

Fig. 7: The absolute value of the Poynting vector |P| for the sinusoidal excitation..