GTD 6.2.9

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11.5. Coupling

When the user has executed a Coupling simulation, the Show Results menu will look like this:

Coupling Show Results menu 

Show Results menu with a coupling simulation


11.5.1. Antenna Coupling

When this option is selected, the following panel will be shown:

Coupling results panel

Figure: Coupling results panel

This panel allows the user to view the coupling (in dB) between each pair of active antenna group and passive antenna. The user can select a row in the table and the geometry panel will only highlight the antennas corresponding to that coupling value (and rendering the other antennas with low opacity). The user can also select a different step and frequency and the coupling values will be updated immediately.

The user can also visualize the results in text format by pressing the "View Text File" button.

Coupling text file

Figure: Coupling text file


11.5.2. Antenna Coupling by Frequency

This kind of plot can be used to compare the coupling obtained by the simulation process against a frequency sweep. This option is useful when the user has selected a frequency sweep in the Simulation Parameters, in order to inspect how the coupling value change through a frequency sweep.

When this option is chosen from the Show Results > Coupling > Antenna Coupling By Frequency menu, the panel presented in the figure below will appear.

Coupling by frequency

Coupling by frequency

This panel displays a plot with the results. More series can be added by selecting the step in the control panel that appears on the left side of the plot.

  • Step: the parametric step to select. These should have been defined prior to the calculation when designing the simulation.
  • Active ant. group: the individual antenna or antenna array that acts as an active antenna.
  • Passive antenna: the antenna that acts as passive antenna.

The selected series can be added to the plot by pressing the Add Series button. It is also possible to modify the look of a series previously added to the chart. You can change the color of a particular series by selecting it in the list and pressing the Change Colors

Series can be imported and exported. To save a series click on the Export series button. It is possible to load previously exported series by pressing the Import Series button and locating the file where the results were saved in.

11.5.3. Antenna Coupling by Step

This option allows the user to plot a graph describing the coupling values for an active antenna-passive antenna pair at each step of a parametric simulation (for a given frequency).

To visualize the coupling values for a pair of antennas at a given frequency, the user needs to select the desired parameters in the left side of the panel and then click the "Add Series" button. It is possible to view several graphs at the same time. If the user wants to delete a particular graph, they can do so by selecting it in the combobox in the "Options" panel and then pressing the button with the icon of a cross. The user can also export series to text format and import them from the same format.

Coupling by step panel

Visualizing coupling values by step


11.5.4. Antenna Coupling Text Files

This option shows the coupling results as a text file. First, a panel should appear after selecting this option. Selecting this option will display a panel where the user should select an step. To use this section select a parametric step and click on OK to load the data. A table will be presented with the coupling values. To save the result click on the Save as... button below the table.


Coupling text file

Showing the result text file

11.5.5. Power angular spectrum

The Power Angular Spectrum represents the power of the rays that reach the passive antenna according to the arrival direction. The power of each ray that reaches the passive antenna is computed taking into account the angular range in which the ray is received. As shown in the following figure, an imaginary circumference is drawn around the receiver, which is divided into the number of sectors specified by the user. Only the power of the rays received within a specific angular range is associated with the angular range.



These options are only available when a coupling analysis has been performed. When this option is selected, the following panel is shown:


 Power angular spectrum panel


In this panel, the user can set

  • Steps: the user can choose the step if a parametric simulation has been performed.
  • Number of sectors: number of divisions in which the angular space is divided. For instance, if the number of sectors is 12, 360º is divided by 12, so each angular sector is 30º.
  • Frequency: the user can also select the frequency.
  • Representation type: the user can also select whether to show a linear graph or a polar one.

When the user presses the Ok button, the chart is shown:


 Power angular spectrum chart



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