Figure 7 - Reflection from and transmission through the FSS.
A view of the electric field magnitudes at 15.02 GHz (which can be calculated after the simulation by using the “Calculate fields at axis marker” option) reveals the two full-wavelength resonances due to the two Floquet port modes.
Figure 8 - Electric fields at 15.02 GHz show the two Floquet port mode resonances.
Parameter sweep analysis
As mentioned previously, the dependence of the FSS resonant frequency on the angle of the incident plane wave is of interest. A parameter sweep can be set up to vary the incident angle, in this case
theta from 0 to 50 degrees, and the reflection and transmission coefficients can be investigated as an automated post-processing step.
Figure 9 - A parameter sweep can be set up to observe the effect of scan angle on the FSS transmission
characteristics.
The transmission coefficient of the TE mode shows greater dependence on variation of the scan angle in theta than the TM mode does. This is to be expected since the incident wave’s direction of incidence has not changed relative to the top and bottom of the rings (as oriented in the field plots above), only to the left and right.
Figure 10 - Effect of varying theta on transmission of the TE mode through the FSS.
Figure 11 - Effect of varying theta on transmission of the TM mode through the FSS.
Conclusion
This tutorial has described how CST MWS may be used for the simulation of frequency selective surfaces. The set up of the simulation may be greatly simplified by using a template which configures the simulation appropriately and generates Floquet port modes with parameterized incident angle of the plane wave. Once the geometry of a single cell has been constructed the periodicity can be set up very flexibly. Reflections from and transmissions through the FSS can be observed easily using the familiar S-parameter representation. Finally, a parameter sweep of the incident wave angle can be performed to investigate its effect on the performance of the FSS.
三 Antenna Tutorial
Single Antenna (Transient Solver):
Single Antenna (Frequency Domain Solver):
Antenna Array (Transient Solver):
Antenna Array Combine (Transient Solver):
Antenna Array Simultaneous (Transient Solver):
Contents
Geometric Constructions116 Introduction and Model Dimensions Geometric Construction Steps Common Solver Settings
S-Parameter and Farfield Calculation Transient Solver