Parameters:
NAnt (N): number of antennae
dAnt (d): distance between two adjacent antennae
c0 (c): light speed ≈ 3x108 m/s
λ0 (λ): radio wavelength
ω0: radio wave angular velocity: ω0 = 2πc0 / λ0
ΔT: unit delay (in second), negative value stands for unit lead
ω0 ΔT: beam pattern steering phase
θ: angle refers to antenna plane normal vector (from -180° to +180°)