Abstract
ABSTRACT The vortex electromagnetic wave has attracted considerable attentions due to its theoretically infinite and orthogonal orbital angular momentum (OAM) mode characteristics. However, it is very difficult to generate high-gain (or narrow beam-hollow) and multi-OAM mode vortex electromagnetic waves. To solve this problem, a good idea is proposed in this paper. To verify the feasibility, a model system composed of a UCA-typed feed, an off-set parabolic reflector and a set of supporting structure was designed, studied and verified by simulation and experiment. It turns out that the presented method and design in this paper has the advantages of much smaller flare angle, high gain and multi-mode (up to 15) multiplexing ability over other single-mode antennas.
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