So,
considering a 2x2 planar array of squared patch antennas linearly polarized (H-Pol), considering a Uniform Amplitude and Phase excitation,
considering the elementar patch given by a probe-fed squared microstrip antenna the results are the following:
Directivity: 14.5 dBi
Beamwidth (-3 dB) : [-17.5° 17.5°] on fi =0°
Beamwidth (-3 dB) : [-19° 19°] on fi =90°
Nulls Position on fi =0° plane : [-46° +46°]
Nulls Position on fi =90° plane : [-46° +46°]
Computation time: about 30 seconds.
Can you also compute the contour plot?
Regards
Lupin