Can 𝜆/4 Radiators Be Really Isotropic?

Figure 9

Convergence of the multipole expansion of the far-field power for the isotropic spherical radiator. It is shown in two scales: in a coarse scale (a) and in a fine scale (b), for 0<𝜃<𝜋 and 𝜑=𝜋/4. It is shown that 6 multipole terms are enough for excellent convergence of the far-field power.

(a)

(b)