Planar Array

open the planar array definition window

A planar array is a grid of source points. The grid is defined in a local referential. This local referential may be translated in the referential of the geometry. It may also be rotated around the 3 axis.

If the source points must be close to a surface, the On Surface button must be checked. In that case, the software will try to find the nearest surface for each source point.

All the source points have the same radiation pattern. The details of the far field description may be found here.

The amplitude and the phase of each source point may be modified. This is done with the feeding law file. This file contains 1 line per source point. Each line contains :

a number (ignored by IDRA)
amplitude factor (absolute value, not in dB)
phase (degrees)

Concerning the order of the source points, the X loop is inside the Y loop. The figure in the definition window shows where is the M+1 point.

There is a very simple example of feeding law file (all the sources are synchronized):

1 1. 0.

2 1. 0.

3 1. 0.

4 1. 0.