Viewing the Results

View and post-process the results from the characterised surface in POSTFEKO.

View the E-field above the characterised surface on a Cartesian graph. The results are compared to those calculated with a full solution (using multilevel fast multipole method (MLFMM)) where the geometry of the FSS element was duplicated to create the finite 31x31 element sheet.
Table 1. Computational requirements
31x31 FSS element sheet RAM Simulation time
Characterised surface - RL-GO 13 MB 39 sec
Full solution - MLFMM 542 MB 8 min 42 sec

Note the significant difference in computational requirements. Both simulations are run in parallel using four cores. A factor of 42x reduction in memory and 13x in simulation time is achieved using the characterised surface approach.

A practical example where the characterised surface is extremely useful is shown below: an FSS nosecone radome is represented using this feature. Due to the size and complexity of the structure, it becomes prohibitive to model and solve with a full wave solution, while the characterised surface approach is relatively straightforward and efficient.

Figure 1. E-field above the characterised surface for 2 theta angles.

Figure 2. Full model of the 31x31 element FSS sheet solved with MLFMM.

Figure 3. E-feld distribution through an FSS radome calculated using a characterised surfaces.