Sidelobe Level Reduction in Symmetric Dual-Reflector Antennas Using a Small Lens Antenna

Abstract

In many applications, sidelobe level (SLL) reduction of a reflector antenna in a particular direction is needed. In this paper, a novel method to achieve this reduction in a symmetric dual-reflector antenna is presented. An offset lens antenna is attached to the center of the subreflector to direct some rays in a desired direction and yet reduce the SLL effectively. The new designs are compared with the conventional Cassegrain for various feed patterns. Simulation results demonstrate the effective suppression of sidelobe level in the desired directions of the proposed designs.