MOM 6.2.10

15.13.1. Example 1: Analysis of a rectangular Reflectarray

This case explains how to analyze a reflectarray layout. The database used on step 4 to create the reflectarray layout is the database for 37 steps and 20 divisions per wavelength created on section 15. Annex 2 on Periodical Structures User Guide.

 

Step 1: Create a new MOM Project.

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

 

Figure: New Project panel

 

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

 

Step 2: Create the geometry model.

First, select 'millimeters' on units list on the bar at the bottom of the main window.

Figure: Units Selection

 

Add these parameters to have the reference for the reflectarray layout generation. On this tab, all the parameters to be used in the construction of geometry will be set as describes the section 4.4.1 Define Parameters on GUI User Guide.

-    ‘length’: contains the length value for the plane of the reflectarray layout. In order to follow the reference article, this parameter must be the length of the unitary cell of the database (x = 11.43mm) multiplied by 37 unitary cells that the reflectarray contains in ‘X’ axis.
-    ‘width’: contains the width value for the plane of the reflectarray layout. In order to follow the reference article, this parameter must be the width of the unitary cell of the database (y = 10.16mm) multiplied by 29 unitary cells that the reflectarray contains in ‘Y’ axis.
-    ‘focus’: contains the value for the position of the focus on the ‘Z’ axis. This value will be used for positioning a relative plane to locate the radiation pattern and its value is 340mm.

Figure: Define Parameters panel

 

Generate a plane with a width of ‘length’ and a depth of ‘width’, with the first corner on -‘length’/2, -‘width’/2, 0; executing the 'plane' command writing it on the command line and sets the parameters when command line asks for it.

 

Figure: Plane 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: Simulation Parameters panel

 

Step 4: Create a reflectarray layout.

Select 'Source --> Reflectarray --> New Layout' option. The following panel will appear. First load de database previously created with Periodical Structures module. Then select the parameters as the next figure shows

 

Figure: Reflectarray New Layout panel

 

Clicking on the 'eye' icon, the parameters of the database will be shown on a new tab.

Figure: Reflectarray Database Information panel

 

Select the plane previously created to generate the reflectarray on it. Then, click on 'Create' button and wait until the reflectarray layout is created.

Figure: Reflectarray creation process

 

Figure: Reflectarray Layout

 

Step 5: Set the antenna parameters.

First, select 'View--> Reference Plane' and set the parameters as the next figure shows, then click on 'Update' button to put the reference plane as the figure:

Figure: Reference Plane panel

 

Select 'Source --> Import Pattern File' option and select 'BOC0677.dia' file from 'myDataFiles' folder on the installation path of newFASANT software.

Figure: Pattern File Import panel

 

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

Important: select the checkbox "Relative to reference plane" to set the position and orientation relative to the local reference plane.

 

Figure: Pattern File Antenna panel

 

Step 6: Set solver parameters.

Select Solver --> Parameters' to open the solver configuration panel and then set the following parameters in order to obtain the most possible efficiency and the 3D results:
-    OpenMP option for the Architecture Strategy, on Solver parameters panel.


Figure: Solver parameters panel

Then click on 'Advanced Options' button to configure the advanced properties as the next figure shows:

- Check the “Compute 3D Pattern” box and set the angle step to 0.5, on ‘Main Properties’ tab.
- Check the “Enable Preconditioner” box and select Diagonal Preconditioner option on ‘Preconditioner’ tab.

Figure: Solver Advanced Options panel

Step 7: Meshing the geometry model.

Select 'Meshing --> Parameters' to open the meshing configuration panel and then set the parameters as show the next figure.In this case, the number of division is selected by the case with the most accuracy of the databases compared to section 15 of Periodical Structures User-Guide. The number of processors to be selected, to improve the efficiency on time, will be the number of the processors of the machine where the example will be executed.

 

Figure: Meshing Parameters panel

 

Step 8: Execute the simulation.

Select 'Calculate --> Execute' option to open simulation parameters. Then select the number of processors as the next figure show. The number of processors to be selected, to improve the efficiency on time, will be the number of the processors of the machine where the example will be executed.

 

Figure: Execute Parameters panel

 

Step 9: 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 on GUI User Guide.

Select 'Show Results --> Far Field --> View Cuts' option to show the cuts of the observation directions options. Delete all series with the red cross button and select 'Gain Lineal' and 'ETotal Gain (dBi)' on 'Component' panel, then click on 'Add Series' button.

 

Figure: Far Field cuts

 

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 3D Pattern' option to show the cuts of the radiation pattern options.

 

Figure: Radiation Pattern 3D

 

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

 

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