How two crossed dipoles' impedance varies with their non-orthogonality, length & separation

To model the electromagnetic mutual impedance between a pair of "crossed dipoles" (a.k.a. "cross dipoles") whose relative orientation is skewed (i.e., not perpendicular), this paper advances a new modeling approach — the "phenomenological" or "behavioral" approach. This new approach leads to simple models of the mutual impedance, as closed-form expressions parameterized explicitly by the dipoles' ...