Creating First Simulation

Table of contents:


Principles of EM Time-Domain? Simulation

To get correct results from a time-domain EM simulation it is important to understand the basic principles of the tlmGine simulator.

A time-domain EM simulator is recursively updating for each time-step the state of the discretized electromagnetic field and computes so the propagation of the EM field. The excitation sources define the prescribed sources for the simulation. As the EM field evolves, the EM energy injected into the system by sources is usually decaying - either in losses of the structures, by transmission to other ports, or radiated. This is not true for closed non-lossy systems, where the injected energy is kept constant inside the system.

The tlmGine simulator can monitor the decay of EM energy in the system (in dB) and can stop the simulation if a prescribed relative energy level has been reached (e.g., -30 dB).

Simulation Flow

To create a simulation you should follow the following simulation flow (the order is important):

  1. Define your materials based on material properties (permittivity/permeability)
  2. Define your geometry objects and assign materials to them
  3. Define your sources (e.g., discrete voltage sources or plane wave sources)
  4. Define your background properties (background material and size of the simulation domain)
  5. Define your simulation setup - relative final energy, maximum number of time-steps, discretization

Now you should be ready to start the simulation by clicking on Simulation->Run. The tlmGine simulator will start the simulation and you will see a progress bar. When the simulation is finished you will see the resulting time-domain signals and the S-parameters.

Now you can export the S-parameters to a touchstone (s*p) compatible file, which you can use in, e.g., a circuit simulator.

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