Test Case B

This example describesthe calculation offield differencein aobservation planeofpointsbetween twoboxeswithoutandwith a slot, having adipoleinone of the boxes. The same processwill be performedon a lineofobservationinside the boxin which thedipoleis not found.

Step 1: Create a new MOM Project.

Open 'New Fasant' and select 'File --> New' option.

Figure 1. New Project panel

Select 'MOM' option on the previous figure and start to configure the project.

Step 2: Create the geometry model.

Execute 'box' command writing it on command line and sets the parameters as the next figure shows when command line ask for it.

Figure 2. 'Box' Command parameters

To generate other box execute 'symmetric' command as the next figure shows.

Figure 3. 'Symmetric' command parameters

Step 3: Set Simulation Parameters

Select 'Simulation --> Parameters' option on the menu bar and the following panel appears. Set the parameters as the next figure shows and save it.

Figure 4. Simulation Parameters panel

Step 4: Set the antenna parameters.

Select 'Antenna --> Dipole Antenna' option and set the parameters as show the next figure. Then save the parameters and the antenna appears.

Figure 5. Dipole Antenna panel

Step 5: Set Near Field parameters.

Select 'Output --> Observation Points' option. The following panel will appear.

Figure 6. Observation Points panel

To add a plane visualization, select 'plane' on the selector of 'Geometry Types' section and click on 'Add' button. The plane parameters panel will appear, then configure the values as the next figure show and accept it clicking on 'OK' button.

Figure 7. Observation Plane panel

The observation will appear as a dashed line on the position configured.

Figure 8. Observation visualization

To add the line observation, repeat this step with the 'line' option on the selector of 'Geometry Types' and the following parameters.

Figure 9. Observation Line Panel

Figure 10. Observation visualization

Step 6: Meshing the geometry model.

Select 'Meshing --> Parameters' to open the meshing configuration panel and then set the parameters as show the next figure.

Figure 11. Meshing panel

Then click on 'Mesh' button to starting the meshing. A panel appears to display meshing process information.

Figure 12. Meshing process log

Step 7: Execute the simulation.

Select 'Calculate --> Execute' option to open simulation parameters. Then select the number of processors as the next figure show.

Figure 13. Execute panel

Then click on 'Execute' button to starting the simulation. A panel appears to display execute process information.

Figure 14. Execute process log

Step 8: Save the project

Select 'File --> Save' option to save the project. Select a name and a path to save it on the file chooser that appears.

Step 9: Modify the geometry to make the slots in the boxes.

Execute 'explode' command with the boxes selected and follow the steps like shows the next figure. This command divide each object on independent surfaces.

Figure 15. 'Explode' command

Execute 'delete' command with the nearest surface to observation plane selected in the boxes.

Figure 16. 'Delete' command

Execute 'plane' command with the parameters shows on the next figure.

Figure 17. 'Plane' command

Repeat the operation with the following parameters.

Figure 18. 'Plane' command

Execute 'explode' command with the new planes selected.

Execute 'booleanDifference' command with the surfaces given for the previous 'explode'. This command ask for two surface to eliminate the second one from the first one.

Figure 19. 'booleanDifference' command

Execute 'rotate' command with the new surface previously selected, using the parameters shown on the next figure.

Figure 20. 'Rotate' command

Execute 'symmetric -c' command with the surface used on previous step. Use 'symmetric' parameters as the following figure shows.

Figure 21. 'Symmetric' command

Execute 'group' command with the surfaces composing one of the boxes previously selected. Then repeat the operation with the surfaces composing the other box.

The final result is a geometry with two boxes with a slot on the front surface to the observation plane.

Figure 22. Geometry visualization

Step 10: Meshing and calculate again like steps 6 and 7.

Step 11: Show results.

Select 'Show Results --> Post-Process' option to calculate the field difference on the plane observation between this example (slotted boxes) and the example executed on the first part of this guide (closed boxes). To see the result as a plot, select 'plot' on the selector of 'New Trace' option and click on 'OK' button.

Figure 23. Post-Process Trace panel

To import the result of the other project, first select the result to show on 'Simulation results', 'Results Type' and 'Results Options' combo boxes. In this case, the values of the next figure for 'Trace options' panel.

Figure 24. Trace Options

Then click on 'Import trace form project' button to import the selected results to a project. In the panel that appears, select the project on the file chooser opened with 'Browse' button. Then click on 'Save' button to import the results. The imported results appears on 'Results Type' combo box as a new entry with the name of the selected to import with an index indicating the order of the imported projects.

Figure 25. Imported trace

Set the parameters as next figure and add on 'OK' button.

Figure 26. Field Difference parameters

Figure 27. Field Difference plot visualization on plane observation

To show the result as a diagram, repeat step 11 selecting 'diagram' on the 'Post-Process Trace' panel.

Figure 28. Field Difference diagram visualization on plane observation

To show the same results over the line observation, follow the steps explained for the plane observation but previously to click on 'OK' button to show the results, click on 'Parameters' button on 'Trace Representation' panel. Then select the line observation on the panel that appears and confirm the changes.

Figure 29. Field Difference plot visualization on line observation

Figure 30. Field Difference diagram visualization on line observation