The main beam maximum of a 10×10 planar array of isotropic elements 100 elements is directed toward θ₀=10⁰ and φ⁰=45⁰. Find the directivity, beamwidths in two perpendicular planes, and beam solid angle for a Tschebyscheff distribution design with side lobes of −26 dB. The array is placed on the x−y plane and the elements are equally spaced with d=λ4. It should be noted that an array with bidirectional two-sided pattern elements would have a directivity which would be half of that of the same array but with unidirectional one-sided pattern elements.