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The 4-element slot-coupled patch sub-array is simulated using [[EM.Picasso]]'s [[Planar Method of Moments|planar method of moments]] (MoM) solver. An adaptive frequency sweep is performed to compute the frequency response of the structure over the frequency range [2.2GHz - 2.6GHz]. The figures below show the variation of the sub-array's return loss with frequency and its 3D far-field radiation pattern computed at 2.4GHz.

The matrix size for this planar MoM simulation is N = 10,771. The slot-couple patch structures usually lead to highly ill-conditioned linear systems as they involve both electric and magnetic current unknowns[[EM. A stabilized bi-conjugate gradient (BiCG-STAB) linear Picasso]]'s LU solver was used to solve solver the linear system. The total computation time including the LU decomposition, which converged after more than 6,300 iterationsback-substitution and computation of the full 3D far-field radiation pattern at an angular resolution of 1° along both the azimuth and elevation directions was 150 seconds. At the end of the planar MoM simulation, the following port characteristics are reported:

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