Source Point
open the source point definition window
The source point location is defined with its three coordinates (X,Y,Z). For a real antenna, the source point location is the position of the phase center.
This far field pattern may be moved with 3 rotation angles (around axis X, Y and Z).
In the case of coupling computation, the input impedance of the source is required.
If the source 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.
The free space far field pattern of the point source is described in a file. The format of this file is the same as the output format of IDRA. This file may be generated by another software, or it may build from measurements.
Example (there is only the beginning of the file) :
1.0300000E+09
-180.0000 180.0000 2.000000
0.0000000E+00 135.0000 45.00000
LOCATION ETHETA EPHI gain in dB POLARISATION
THETA PHI magn. phase magn. phase vert. horiz. total axial r. angle direction
-0.1800E+03 0.0000E+00 0.9555E-01 -0.1377E+03 0.0000E+00 0.0000E+00 0.4167E-06 -0.2000E+03 0.0000E+00 0.0000E+00 0.1137E-05 LINEAR
-0.1780E+03 0.0000E+00 0.9549E-01 -0.1377E+03 0.0000E+00 0.0000E+00 -0.5292E-02 -0.2000E+03 -0.5293E-02 0.0000E+00 0.1754E-05 LINEAR
-0.1760E+03 0.0000E+00 0.9531E-01 -0.1377E+03 0.0000E+00 0.0000E+00 -0.2118E-01 -0.2000E+03 -0.2118E-01 0.0000E+00 0.1816E-05 LINEAR
-0.1740E+03 0.0000E+00 0.9502E-01 -0.1377E+03 0.0000E+00 0.0000E+00 -0.4771E-01 -0.2000E+03 -0.4771E-01 0.0000E+00 0.1518E-05 LINEAR
-0.1720E+03 0.0000E+00 0.9462E-01 -0.1377E+03 0.0000E+00 0.0000E+00 -0.8494E-01 -0.2000E+03 -0.8494E-01 0.0000E+00 0.2609E-05 LINEAR
In fact, IDRA doesn't read the entire file. The following items are required :
Remarks :
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