A square planar array has $25$ isotropic elements arranged in five rows of five elements each, with spacing of $0\mathrm{.}5$ between elements and a uniform current distribution. Another square planar array has $16$ isotropic elements arranged in four rows of four elements each, with spacing of $0\mathrm{.}625$ between all adjacent elements, but it has a triangular current distribution $($Figure b$).$ Write the equation for the radiation pattern and find the maxima for each array. Additionally, plot the radiation pattern $($linear and polar$)$ in the $45$ plane for both arrays and discuss the results. $($a$)$ Uniform.

$($b$)$ Triangular.