Figure 2. Norm of the electric field in the E-plane, in decibels, measured (top row) and simulated (bottom row) as functions of the antenna receiver angle ϕ_exp in degrees (in abscissa) and emitting frequency in GHz (in ordinate).

At each frequency, the field is normalized by its maximum in the E-plane. The emitter-to-sphere gaps are (a) 5 mm, (b) 10 mm and (c) 20 mm.