ANALYSIS OF ONE-DIMENSIONAL ZONAL REFLECTORS

A one-dimensional zonal reflector is a conducting surface which is uni form in one direction and has a zonal profile in the other. Similar to a cylindrical reflector, it converts a cylindrical wave from a line-s ource into an outgoing plane wave. In this paper, the radiation perfor mance of such reflectors with TM-wave illumination is analyzed by the method of moments (MoM). The influence of corner diffraction and zonin g on the sidelobe level is investigated. Three types of configurations are considered, which include the parabolic zonal reflector and two s tepwise zonal reflectors of different configurations. It is found that corner diffraction makes a significant contribution to the sidelobe l evel, but zoning intrinsically raises the far-out sidelobes. Numerical results show that the near-in sidelobes of the stepwise zonal reflect or can be significantly decreased by adjusting the geometrical configu ration.