Yatpac - The Ultimate Open Source TLM Simulation Package

Curved Microstrip Line (2)

1. Example Description

This example is a curved Microstrip over a circular arc. The curvature of the Microstrip coverers a complete quadrant (90 degrees), Fig. 1-2. The characteristics of the structure are identical to 90 Degrees bend Microstrips of the examples Microstrip_bend and Microstrip_bend_LF. In this case the simulation is repeated with a relatively narrowband excitation and no numerical dispersion is observed.

Fig. 1: The model of the curved Microstrip with the ground plane.

Fig. 2: The complete model of the curved Microstrip with the dielectric material.

2. TLM model

The curved Microstrip structure, excitation-type and simulation setup are given in the TLM model files I3D.dev.

The structure is excited with a Gaussian signal. In this case the time duration of the gaussian pulse such that the simulation bandwidth approximately 31GHz. The excitation is modeled by Templete (see documentation) which excites the field distribution of the fundamental mode. Absorbing boundary conditions are used at the boundaries of the simulation domain.

3. Simulation Results

3.1 Electromagnetic Field Visualization

The visualization sequence, Fig. 3 is similar to the example Microstrip_bend. As simulation results, in Fig. 2-3-4-5 we display different snapshots of field distribution at several different positions of the traveling Gaussian pulse.

Fig. 3: Snapshot of the field distribution with isosurface.

3.2 Computed Time-Domain Signals

Similarly to the example Curved-Microstrip, the time domain voltage signals at several different positions of the travelling Gaussian pulse are displayed in Fig. 4. We may observe that also in this case, that there is no effect of the numerical dispersion.

Fig. 4: The time domain voltages signals.