For the following radiation intensities, find the directive gain and directivity: (a) U(, )= sin2 , 0

Question:

For the following radiation intensities, find the directive gain and directivity:
(a) U(θ, Φ)= sin2 θ, 0 < θ < π, 0 < Φ < 2π
(b) U(θ, Φ)= 4 sin2 θ cos2 Φ , 0 < θ < π , 0 < Φ < π
(c) U(θ, Φ)= 10 cos2 θ sin2 Φ/2, 0 < θ < π, 0 < Φ < π/2