一种高效均匀复合型菲涅尔透镜设计

Design of a high efficiency and homogenized compound Fresnel lens

针对可见光通信系统中菲涅尔透镜天线无法兼顾高聚光效率和均匀性的问题,设计了一款复合型菲涅尔透镜。通过采用分区法将透镜分成内环区和外环区,提高了菲涅尔透镜的聚光效率,并结合分布式焦点法对透镜结构进行优化,改善了聚光光斑能量均匀性。仿真结果表明,该复合型菲涅尔透镜实现了高聚光效率下的能量均匀分布,适用于高增益、短焦距和小视场角的可见光通信系统。

In view of the problem that the Fresnel lens antenna can not take into account the high concentra- tion efficiency and uniformity in visible light communication system. A compound Fresnel lens is designed in this paper. Based on the partitioning method, the lens is divided into inner and outer ring regions, and the effi- ciency of Fresnel lens is improved. The method of distributed focusing is used to optimize the lens structure and improve the energy uniformity of the concentrator spot. The simulation results show that the compound Fresnel lens is achieved a uniform distribution of energy under a high concentration efficiency. The designed Fresnel lens is suitable for the application with small angle, high gain and short focal length in visible light communication system.