Example 2: Radome with FSS
This document shows an example to create a radome with FSS. The table below resumes the parameters taken into account in the following example:
Data | Definition | Values |
---|---|---|
Frequency | Simulation Frequency | 10 GHz |
Material | Teflon | Er = 1.9 |
Thickness | Radome thickness | 4 mm |
FSS | Radome FSS | Cross |
Create a new MOM project. To do that, click on New Project button and select the MOM module.
![](../../../../../images/newfasant/mom/training_examples/radomes/MoMmodule.png)
Set the frequency. Click on Simulation –> Parameters menu and then the Simulation panel is open on right side of screen. Set the frequency to 10 GHz and click on Save button before closing the panel.
![](../../../../../images/newfasant/mom/training_examples/radomes/simulation_parameters.png)
Set the feeding. Click on Source -> Primitive Antennas -> Horn -> Pyramidal Horn menu and click on Add with default parameters. Note The default parameters of the horn are calculated automatically for the simulation frequency.
![](../../../../../images/newfasant/mom/training_examples/radomes/horn.png)
Set the Radome Geometry. To create the radome geometry follow this steps:
1. Change Y axis of Reference Plane to Z axis. Click on View -> Reference Plane and set Y-axis to (0.0, 0.0, 1.0) and then click on Update button.
2. Draw an arc with the following parameters. Click on Geometry -> Curve -> Arc.
![](../../../../../images/newfasant/mom/training_examples/radomes/arc.png)
3. Draw another arc with the following parameters. The thickness between the two arcs is 4mm.
![](../../../../../images/newfasant/mom/training_examples/radomes/arc2.png)
4. Click on Reset button of the Reference Plane panel.
5. Revolve arcs. Click on Geometry -> Surface -> Revolve and select the two arcs. For a better meshing create the surfaces with 90 degrees of revolution.
![](../../../../../images/newfasant/mom/training_examples/radomes/revolve.png)
Set the FSS. To create a conformed FSS on the radome surface folow this steps:
1. Draw the FSS Element. Click on Source -> Radome -> FSS Primitives -> Crosses -> Cross and click on Save button with default parameters. The FSS Element must be on XY plane and centered on (0.0, 0.0, 0.0).
![](../../../../../images/newfasant/mom/training_examples/radomes/fss.png)
2. Select the upper surfaces of the radome and click on Edit -> Geometric Operations -> Arrays -> Array On Surface.
![](../../../../../images/newfasant/mom/training_examples/radomes/arrayOnSurface.png)
3. Group radome interfaces. Select the upper and lower surfaces of the radome and group them separately.
![](../../../../../images/newfasant/mom/training_examples/radomes/group_interfaces.png)
4. Remove the crosses that are not closed and the FSS Element. Select crosses and click on Edit -> Explode and then select the individual cross and click on Edit -> Delete.
![](../../../../../images/newfasant/mom/training_examples/radomes/delete.png)
5. Group the crosses again. Crosses can be selected by clicking on the tree surfaces folder. Click on Edit -> Group.
6. It is possible to give a thickness to the crosses. In this case select the crosses and click on Geometry -> Solid -> Extrude Normal. Set the thickness to 1mm.
![](../../../../../images/newfasant/mom/training_examples/radomes/extrudeNormal.png)
7. Group the crosses with their thickness and rename the objects as you can see in the following image.
![](../../../../../images/newfasant/mom/training_examples/radomes/geometry.png)
Configure Radome Parameters. To finish defining the radome follow the next steps:
1. Click on Source -> Radome -> Define Radome menu and add a radome.
![](../../../../../images/newfasant/mom/training_examples/radomes/add_radome.png)
2. Select the object of Interface 1 (lower) and the first row in Radome panel and then click on Set Objects button. Repeat the process with the object of Interface 2.
![](../../../../../images/newfasant/mom/training_examples/radomes/interface1.png)
3. Selects the FSS object and the second interface in Radome Panel. Click on Set FSS Elements button.
![](../../../../../images/newfasant/mom/training_examples/radomes/fss_radome.png)
4. Select the material 'Teflon' on Interface 1. Click on Save button of Radome panel. Note The material of interface 1 corresponds to the material between the two interfaces.
![](../../../../../images/newfasant/mom/training_examples/radomes/material_radome.png)
Meshing Geometry. Click on Meshing -> Create Mesh and set planar and curved divisions to 20. Click on Mesh button.
![](../../../../../images/newfasant/mom/training_examples/radomes/mesh.png)
Start Simulation. Click on Calculate -> Execute.
![](../../../../../images/newfasant/mom/training_examples/radomes/simulation.png)
Results
Radiation Pattern:
![](../../../../../images/newfasant/mom/training_examples/radomes/gain.png)
![](../../../../../images/newfasant/mom/training_examples/radomes/currents.png)