The above doubly infinite periodic Green's functions are said to be expressed in terms of "Floquet Modes". The exact formulation involves an infinite set of these periodic Floquet modes. During the MoM matrix fill process for a periodic structure, a finite number of Floquet modes are calculated. By default, [[EM.Cube]]'s planar MoM engine considers M<sub>x</sub> = M<sub>y</sub> = 25. This implies a total of 51 modes along the X direction and a total of 51 modes along the Y direction, or a grand total of 51<sup>2</sup> = 2,601 Floquet modes. You can increase the number of Floquet modes for your project from the Planar MoM Engine Settings Dialog. In the section titled "Periodic Simulation", you can change the values of '''Number of Floquet Modes''' in the two boxes designated X and Y.
== EM.PicassoCube's Linear System Solvers ==
After the MoM impedance matrix '''[Z]''' (not to be confused with the impedance parameters) and excitation vector '''[V]''' have been computed through the matrix fill process, the planar MoM simulation engine is ready to solve the system of linear equations: