Synthesis of a circular polarized field radiated by an electric dipole located over a rectangular screen

Electrodynamic characteristics of a four-vibrator radiator with a square screen

“…8b (curves 3 and 4), the radiation patterns in the main and diagonal planes coincide in the sector of observa tion angles θ' = ±30° from the normal to the screen; the ellipticity coefficient in this case σ ≥ 0.8. Figures 8c and 8d show the amplitude patterns for the Е ϕ and Е θ components of the field produced by a circularly polarized four vibrator radiator with an infi nite screen (curves 1, 2) and a square screen (curves 3,4) in the main observation planes. It should be noted that, according to (18a)-(19b), for all screen sizes, Е θ (ϕ' = 0°) = Е θ (ϕ' = 90°) and Е ϕ (ϕ' = 0°) = Е ϕ (ϕ' = 90°).…”

“…In the approximation of the diffracted field by asymptotics nonuniform in the observation angles, obtained from the rigorous solution of the problem on the diffraction of the field of a dipole by the edge of a perfectly conducting infinitely thin half plane (Keller's diffraction coefficients [2,3]), the phase dif ference between orthogonal linearly polarized compo nents of the diffracted fields far from the light-shadow boundaries of the GO field in the far zone are -i.e., the diffracted field has a lin ear polarization. If we use asymptitics of the diffracted fields uniform in the observation angles or half shadow diffraction coefficients defined via the com plex probability integrals, the dependence of the argu ments of the integrals on the observation angles θ' and ϕ' and coordinates of the vibrators with respect to the screen edges results in different dependences of the phases Φ dϕ and Φ dθ of the orthogonal components of the diffracted field on these parameters and, therefore, changes the polarization of the diffracted field (see Fig.…”

“…fields defined in the far zone in the coordinate systems X K Y K Z K with allowance for the phase factors of the fields with respect to the origin of the coordinates XYZ: When cal culating the diffracted fields, we use asymptotics uni form in the observation angle, obtained from the rig orous solution of the problem of the diffraction of the field radiated by an arbitrarily oriented dipole on a perfectly conducting half plane [2,3]. The lightshadow coefficients in (1)-χ i for the GO field and χ in for the diffracted fields-are unity in the illuminated region and zero in the shadow region.…”