10.6 Simulation results convergence
The simulation convergence is an indication that the FDTD processing can be stooped. Below are some practical remarks regarding the simulation results convergence:
In the case of lossless circuits power balance can be treated as a quantitative measure of convergence of simulation. When power balance =1, the user may assume that the FDTD simulation has converged. Note that if power balance does not converge to unity for lossless circuits, this may indicate that some of the energy is dissipated in the source or/and load in modes not considered in the S-parameters extraction.
For lossless structures, where all ports are included in the S-Parameters post‑processing, the efficiency can be treated as a quantitative measure of convergence of simulation. When efficiency=100%, the user may assume that the FDTD simulation has converged.
QuickWave offers also an advanced feature, which tests the simulation convergence based on energy criterion. Additional conditions, regarding e.g. S-parameters fluctuation level are also available. For detailed discussions concerning this feature refer to Energy simulation stop criterion.