Viewing the Results

View and post-process the results in POSTFEKO.

For the first solver run, the full calculation needs to be performed. The static domain solution is stored to file and then re-used in subsequent solver iterations. By storing the solution to the static domain (for this example the waveguide), the Solver only needs to calculate the effect of the feed pin location in subsequent iterations.
  1. View the resource requirements for each iteration.
    Table 1. Comparison of resource requirements for each iteration.
    Iteration Memory (MBytes) Runtime (seconds)
    1 153 27
    2 153 2
    3 153 2
    4 153 2
    5 153 2
    6 153 2
    7 153 2
    8 153 2
    9 153 2
    10 153 2
    11 153 2
    12 153 2
    13 153 2
    14 153 2
    15 153 2
    Note: After the first iteration, the run time was significantly reduced. This effect of reduced run time after the first iteration becomes more pronounced as the size of the static domain increases relative to the dynamic domain.
  2. View the reflection coefficient for each feed position on a Smith chart.
    1. The port is optimally matched when the magnitude of the reflection coefficient is as small as possible or the input impedance is equal to 50 Ω. This condition is roughly met at iteration 6, see Figure 1. This corresponds to a feed position given by
      p i n _ o f f s e t ≈ 6 × p i n _ s t e p _ s i z e = 6 32 λ
      Figure 1. Smith chart showing the reflection coefficient for each feed pin position.


      Tip: Keep the temporary files. Then create the graph by plotting each model's source data.