Example 1: Common Simulation

This case explains how to calculate far-field, radiation pattern, current density, charge density and near field of an open box with a dipole antenna insides the box.

Step 1: Create a new MOM Project.

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

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

Step 2: Create the geometry model. To get the complete information about geometries edition see 4. Geometry Menu.

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

Select box geometry on the main panel and execute 'explode' command writing it on the command line. Then the box will be transformed into 6 surfaces.

Figure 3. Box selection and 'explode' command

Select the top surface and execute 'delete' command. Then the surface will be removed from the geometry.

Figure 4. Surface selection and 'delete' command

Select all remaining surfaces and execute 'group' command.

Figure 5. Surfaces selection and 'group' command

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.

Step 4: Set the source parameters. To obtain more information about sources and antennas see Antennas.

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

Step 5: Set Near Field parameters.

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

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

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

Figure 10. Observation Line 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. In order to obtain the shortest possible time for meshing,it is recommended to run the process of meshing with the number of physical processors available to the machine.

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

Step 7: Execute the simulation.

Select 'Calculate --> Execute' option to open simulation parameters. Then select the number of processors as the next figure show. In order to obtain the shortest possible time for calculating the results,it is recommended to run the process with the number of physical processors available to the machine.

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

Step 8: Show Results. To get more information about the graphics panel advanced options (clicking on right button of the mouse over the panel) see Annex 1: Graphics Advanced Options.

Select 'Show Results --> Far Field --> View Cuts' option to show the cuts of the observation directions options.

Selecting other values for the component, step, frequency or cut parameters and clicking on 'Add Series' button a new cut will be added to the selected parameters. On 'Show Results --> Far Field' menu, other results are present such as 'View Cuts by Step' and 'View Cuts by Frequency' and this option display the values for one selected point for each step or frequency.

Select 'Show Results --> Radiation Pattern --> View Cuts' option to show the cuts of the radiation pattern options.

Selecting other values for the component, step, frequency or cut parameters and clicking on 'Add Series' button a new cut will be added to the selected parameters. On 'Show Results --> Radiation Pattern' menu, other results are present such as 'View Cuts by Step' and 'View Cuts by Frequency' and this option display the values for one selected point for each step or frequency.

Select 'Show Results --> Radiation Pattern --> View 3D Pattern' option to show the cuts of the radiation pattern options.

Changing values for step, frequency, component or filtering parameters the visualization for the new parameters will be shown.

Select 'Show Results --> View Currents' option to show the current density.

Changing values for step, frequency, magnitude, component or filtering parameters the visualization for the new parameters will be shown.

Select 'Show Results --> View Charges' option to show the charge density.

Changing values for step, frequency, magnitude or filtering parameters the visualization for the new parameters will be shown.

Select 'Show Results --> Near Field --> View Near Field Diagram' option to show the observation points diagram. Previously, select the observation to visualize and the step and frequency on the next figure.

Changing values for incidence, magnitude, field or component parameters the visualization for the new parameters will be shown.

Select 'Show Results --> Near Field --> View Observation Points' option to show the observation points chart.

Figure 22. Near Field Observation Points cuts

Selecting other values for incidence, component, step, frequency or observation parameters and clicking on 'Add Series' button a new cut will be added to the selected parameters. On 'Show Results --> Far Field' menu, other results are present such as 'View Cuts by Step' and 'View Cuts by Frequency' and this option display the values for one selected point for each step or frequency.