On the problem of cylindrical array radiation through inhomogeneous dielectric layer

A method is considered for elimination of the amplitude control in a cylindrical phased-array antenna (PAA). The essence of the proposed solution involves combination of the cylindrical PAA with a ring shaped radial-nonhomogeneous lens. In an approximation of a geometric optics antenna system it is possible to assure circular scanning with a low level of fringe and backscatter radiation, with control only by the phase method. A two dimensional cylindrical antenna array, surrounded by a ring shaped layer of nonhomogeneous dielectric with an index of refraction, varies according to the law n(r) = R(2)/r where R(sub 2) is the exterior radius of the ring-shaped layer. In comparison with the traditional cylindrical PAA in which the radiative elements are positioned only on the illuminated surface, the antenna system considered here gives a gain and a flux density of power P (sub O) in the principal ray without significant deterioration of the directional properties of the system. Thus, use of the elements positioned on the shady side leads to an increase of P (sub O) by 63%. At the same time the directive gain weakly changes.