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EM.Libera Tutorial Lesson 3: Analyzing Wire Antennas

3,665 bytes removed, 23:22, 9 November 2015
{{projectinfo|Tutorial| Analyzing Wire Antennas |WMOM12MOMTUT3 12.png|In this project, wire dipole and loop antennas are modeled and analyzed.|
*[[CubeCAD]]
*VisualizationLine Object*Wire Dipole*Wire MoM Analysis*Gap SourcesSource*S-[[Parameters]]*Far FieldsZ-Parameters*Radiation Pattern*Polyline Object
|All versions|{{download|http://www.emagtech.com|EM.Libera Lesson 3|[[EM.Cube]] 15.9}} }}
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[[Image:MOMTUT3 12.png|thumb|550px|The total 3D radiation pattern of the half-wave dipole antenna.]]
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==Viewing the Simulation Results==
 
[[EM.Cube]]’s computational modules usually generate two types of data: 2D and 3D. Examples of 2D data are probe fields, S/Z/Y [[parameters]] and polar radiation patterns. 2D data are graphed in <b>EM.Grid</b>. Examples of 3D data are near field distributions and 3D radiation patterns. 3D data are visualized in [[EM.Cube]]’s project workspace and the plots are usually overlaid on the physical structure.
 
First, you will visualize the current distribution on the dipole. The "Current Distribution" section of the Navigation Tree plots both electric currents (J) and magnetic currents (M). The Wire MoM solver computes electric currents only as it can only handle PEC objects. The Surface MoM solver can handle both PEC and dielectric objects. In the case of dielectric objects, both surface electric currents and surface magnetic currents are computed. Each current distribution observable contains a list of twelve amplitude and phase plots for all the six current components: J<sub>x</sub>, J<sub>y</sub>, J<sub>z</sub>, and M<sub>x</sub>, M<sub>y</sub>, M<sub>z</sub>. There are also two additional plots for the magnitude of total electric current and total magnetic current. Click on any of these plots to display them in the project workspace. You can use the standard view operations such as dynamic zoom, rotate view, pan view, etc. to better examine these plots.
 
The Far Fields section of the Navigation Tree contains three different 3D radiation pattern plots: the Theta component of the far‐zone electric field, the Phi component of the far‐zone electric field, and the Total far field. You will notice that the Far Field plots are all centered at the origin of coordinates. This is due to the fact that the radiation patterns are calculated in a standard spherical coordinate system center at (0, 0 , 0). Once you are in a near field or far field visualization view, you can always go back to the Normal view mode of the project workspace using the keyboard’s <b>Esc Key</b>.
 
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[[Image:WMOM11.png|thumb|400px|The total current distribution intensity plot.]]
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[[Image:WMOM12.png|thumb|400px|The total 3D radiation pattern plot.]]
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[[Image:WMOM15.png|thumb|400px|right|EM.Cube's Data Manager showing a list of complex data files available for plotting in EM.Grid]]
 
Besides 3D visualization of the radiation patterns, you can plot 2D graphs of the patterns at certain plane cuts. A list of all the 2D output data files generated at the end of a simulation can be viewed in [[EM.Cube]]’s Data Manager. To open this dialog, click the <b>Data Manager</b> [[Image:fdtd_datamanagerb.png]] button of Simulate Toolbar, or use the keyboard shortcut <b>Ctrl+D</b>, or access the menu <b>Simulate &rarr; Data Manager</b>, or right click on the Data Manager item in the “Observables” section of the Navigation Tree and select <b>Open Data Manager…</b>
 
The 2D radiation patterns can be plotted as both Cartesian and polar graphs. Open up the Data Manager dialog and spot Cartesian pattern data files with a “.DAT” file extension as well as the polar (angular) data files with a “.ANG” file extension. The figure below shows the Cartesian and polar radiation pattern plots in the YZ plane cut. Besides the three principal XY, YZ and ZX plane cuts, there are also data files for one additional user defined Phi‐plane cut, which by default is calculated at &phi; = 45<sup>o</sup>.
 
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[[Image:WMOM12A.png|thumb|400px|The 2D Cartesian radiation pattern plot in the YZ plane cut.]]
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[[Image:WMOM12B.png|thumb|400px|The 2D polar radiation pattern plot in the YZ plane cut.]]
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Kazem Sabet
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