The radiation characteristics of two parallel electric dipoles with a finite screen

Power and polarization patterns of a circularly polarized four-dipole radiator with a square screen

“…(1.93) of paper [3] for the ellipticity σ with account of (3), that the ellipticity factor is An antenna realizing this possibility was suggested and studied in [1]. It consists of a pair of mutually parallel halfwave dipoles placed parallel to a planar screen at a certain height (usually equal to one quarter wavelength).…”

“…In many applications, especially for creating the radiators for highly directional reflector or lens-based antennas in radio astronomy, radar and telecommunications, weakly directional radiators, characterized by orthogonal-component patterns with axially symmetric main lobes must be used. Note that an axially symmetric pattern cannot be formed with the use of known antenna feeds like the half-wave electric dipole or dipole with a rectangular screen [1]. This work has been aimed at investigating the possibilities for creating circular-polarized dipole-and slot-hole radiators whose radiation patterns for the orthogonal field components would possess an axial symmetry about the direction of the radiation peak, and also wide polarization patterns.…”

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

“…In [1], on the basis of an asymptotic solution of a three dimensional vector problem of the diffraction of the fields radiated by two parallel half wave vibrators placed in parallel to a perfectly conducting infinitely thin rectangular screen, the radiation pattern, the directive gain, and the radiation resistance as func tions of the geometric parameters and electric sizes of the radiating system were analyzed. It was shown that, choosing the optimal distance between vibrators and the optimal dimensions of the screen, the distance between vibrators and the screen being fixed, the max imum directive gain and a radiation pattern with axi symmetric main lobes are obtained, which is impor tant when such a radiating system is used as a reflector feed.…”

“…x 4 x 6 The normalized radiation pattern of two parallel symmetric vibrators 1 and 2 with the same currents placed at a distance ξ from one another and at a height h over an infinite perfectly conducting infinitely thin screen, in the coordinates R, θ, ϕ is analytically expressed as [1] (4а)…”

“…Expressions for and equations for the light-shadow regions are presented in [2]. In the phase factors of the fields in (1), j is the imaginary unit, k is the wavenum ber, and the distances D 1 , D 2 , D 3 , D 4 (D K ) in the far zone are determined by the path differences of parallel rays passing from the point О and points О K (r K , ϕ K , θ K ) to the observation point. Taking into account that, in the coordinates R, θ, ϕ, the path difference of parallel rays from an arbitrary point with the coordinates and from the point О to the observation point is defined by the expression …”