use Eqs. 9 - 16 to obtain the far-zone electromagnetic fields
of the dipole, in spherical coordinates (i.e., in terms of R, θ, and ∅, and the associated
unit vectors R, θ, and ∅).
Far-zone fields require approximations that take advantage of the fact for am-
plitude terms one can say that, for example, R₁ =R. However, this type of
approximation is way too crude for the complex exponents, since they are asso-
ciated with periodic functions. For the complex exponents one needs instead, for
example, R₁ =R-h cos θ.