Array Dipoles

Attachments

── 1.2.2. Antenna feeding

Once the dipole array has been built, the antenna feeding can be modified in the Source - Antenna Feeding menu. In this panel: the user has to set the degrees (theta and phi) and click on calculate phases in order to compute the amplitude and phase of each array element (the algorithm selected in the right windows considers a uniform amplitude of the array element weighs and a linear phase distribution) or the user can modify each amplitude and phase of each array individually.

The amplitude and phase feeding each element have been saved clicking on Save button.

In order to use this antenna feeding in other projects, the user can export the array weights by clicking on the Export button and the weights are exported as a .txt file. The values of this file can be edit and modify and later import in the feeding menu. Also, the user can generate these files using other software, e.g. the toolbox for arrays of MATLAB.

In this step, the user set theta = 30º and phi=45º and click on calculate phases, then click on Save button to save the amplitude and phase feeding each element.

The user has to save this project as array_dip0.nfs.

Antenna Feeding Panel

Once the previous project has been simulated and its results have been shown, the user has to save it with a new name: array_dip0_weighed.nfs, in order to modify it.

The antenna feeding can be modified in the Source - Antenna Feeding menu. The first seven rows of feeding weights have been selected, note: the user has to maintain press the Ctrl key and select all the rows when a row is selected, it is highlighted in yellow, the corresponding array element. Then, in the module column, we write 0.4 and click on fill value to selection. We can notice that the amplitude of the weights of the seven first elements of the array change from 1 to 0.4.

We repeat the procedure with other elements in the array edges in which we impose an amplitude of 0.4. In contiguous elements, we write an amplitude of 0.8, then we click on save button to keep the new values.

Antenna Feeding Panel

Then we export the array weights by clicking on the Export button and the weights are exported as a .txt file. The values of this file can be edit and modify and later import in the feeding menu. Also, the user can generate these files using other software, e.g. the toolbox for arrays of MATLAB.

   

.txt file

 

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