Synthesis and rigorous analysis of omnidirectional ADE antenna with shaped main reflector described by local conic sections

Abstract

This work investigates the synthesis and analysis of omnidirectional dual-reflector antennas. The body-of-revolution subreflector is generated by a single conic section while the shaped main reflector is generated by a combination local conic sections, sequentially concatenated to each other. The main-reflector is shaped to radiate, under GO principles, a prescribed power density in the elevation. As case studies, four representative axis-displaced ellipse (ADE) configurations are synthesized to provide a sectoral coverage in the elevation plane. Two different ray structures are considered: with a real or a virtual main reflector caustic. For a rigorous analysis of the antenna, a hybrid technique based on Mode Matching and Method of Moments is employed.