GTD 6.3

7.2. Pattern File

The "Pattern File" menu item contains two options to add pattern file antennas to the simulation. While "Pattern File Antenna" allows the user to add an individually defined pattern file antenna to the simulation, the "Pattern File Array" option allows them to add multiple pattern file antennas that will be simulated together. This allows the results to be calculated for the group of antennas as a whole, and not for individual antennas (this is useful when calculating coupling between groups of antennas).

Pattern File menu

 Figure: Pattern File menu

Note: In order to add a pattern file antenna or pattern file array to the simulation, it is necessary to import a DIA file (radiation pattern file) before. To do that, select Antenna -> Import DIA File. Check the "Import DIA file" section in this chapter for more details.

7.2.1. Pattern File Antenna

This option allows the user to introduce several files (at different frequencies) that define the radiation pattern. Firstly, the user has to import a radiation pattern file using the Import DIA file option of the Antenna menu.

Add Pattern File Antenna panel

The following parameters may be edited:

  • Set Radiation pattern file. Click on the Add button to add the imported file to the table where it is possible to specify the frequency, the type and the polarization of the file. 
  • Components: the amplitude and phase of the antenna.
  • Position - Coords: location of the antenna (X, Y and Z).
  • Orientation - Director cosines: orientation of the antenna coordinate system related to the absolute coordinate system.
  • Relative to reference plane: if this check box is selected, the position of the radiation pattern is relative to the reference plane.

The required format of the radiation pattern file is described in GUI User Guide.

7.2.2. Pattern File Array

This option allows the user to add an array of pattern file antennas to the simulation. When the user selects this option in the menu, the following panel will appear:

Pattern File Array panel

Figure: Pattern File Array panel

In this panel, the user can specify the parameters of each pattern file in the same way as in the "Pattern File Antenna" panel (as described in the previous section). Additionally, the user can specify parameters regarding the creation of the array:

  • The point specified in the "Array center" panel is the point where the array center will be located. By checking the "Pick" checkbox, the user can pick the desired point in the geometry panel and the textboxes will be automatically filled with the point coordinates.
  • The "Array parameters" panel contains the values that will determine the number of antennas created along each axis (Number of Elements X, Number of Elements Y and Number of Elements Z), as well as the separations between each adjacent antenna along each axis (Tx, Ty and Tz).
  • The "Array orientation" panel allows the user to specify the directions of the axes considered when creating the array. By default, the array axes are the same as the absolute X, Y and Z axes when the "Relative to reference plane" option is selected.

If the "Relative to reference plane" checkbox is selected, the axes given in the "Array orientation" panel, as well as the point given in the "Array center" panel will be transformed according to the current reference plane coordinate system.

After specifying the parameters, the user needs to click on the "Create Array" button for the array of pattern files to be added to the simulation.

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