=== Visualizing The Far Fields ===
[[File:PMOM118.png|thumb|[[Planar Module]]'s Radiation Pattern dialog]]
Even though the planar MoM engine does not need a radiation box, you still have to define a "Far Field" observable for radiation pattern calculation. This is because far field calculations take time and you have to instruct EM.Cube to perform these calculations. To define a far field, right click the '''Far Fields''' item in the '''Observables''' section of the Navigation Tree and select '''Insert New Radiation Pattern...'''. The Radiation Pattern Dialog opens up. You may accept the default settings, or you can change the value of '''Angle Increment''', which is expressed in degrees. You can also choose to '''Normalize 2D Patterns'''. In that case, the maximum value of a 2D paten graph will have a value of 1; otherwise, the actual far field values in V/m will be used on the graph.
Once a planar MoM simulation is finished, three far field items are added under the Far Field item in the Navigation Tree. These are the far field component in θ direction, the far field component in φ direction and the "Total" far field. The 3D plots can be viewed in the project workspace by clicking on each item. The view of the 3D far field plot can be changed with the available view operations such as rotate view, pan, zoom, etc. If the structure blocks the view of the radiation pattern, you can simply hide or freeze the whole structure or parts of it. In a 3D radiation pattern plot, the fields are always normalized to the maximum value of the total far field for visualization purpose:
:<math>|\mathbf{E_{ff,tot}}| = \sqrt{ |E_{\theta}|^2 + |E_{\phi}|^2 }</math><!--[[File:PMOM89.png]]<br /-->
[[File:PMOM118.png]] Figure 1: [[Planar Module]]'s Radiation Pattern dialog. [[File:PMOM119.png|800px]]
Figure 2: 3D polar radiation pattern plot of a microstrip-fed patch antenna.
[[File:PMOM120.png|800px]]
Figure 2: 3D vectorial (cone) radiation pattern plot of a microstrip-fed patch antenna.