R320 Waveguide with a 90 Degree Bend

1. Example Description

In the following example an R320 rectangular waveguide with a 90 degree bend 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.

Fig. 1: Rectangular waveguide with a 90 degree bend.

2. TLM model

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

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

As simulation results, we have performed a field analysis. 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..