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室内可见光通信系统中菲涅尔透镜接收天线的设计研究?
Design and study of Fresnel lens for an antenna in indo or visible light communication system
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摘要: 针对基于白光LED室内可见光无线光通信技术的应用需求，设计了等齿距平面菲涅尔透镜.相比常规透镜光接收天线，菲涅尔透镜具有聚焦能力强、焦距短、透镜厚度薄、重量轻、成本低等优点.利用Trace pro软件对设计进行了模拟仿真，分析了透镜不同设计参数对接收天线光学增益、光学效率及光斑尺寸的影响，讨论了透镜在平行光斜入射时的会聚情况.结果表明，平面点聚焦菲涅尔透镜的光学效率可达92.1%，适用于小视场、高增益接收光学系统前端.Abstract: Indoor visible light communication is a novel wireless communication based on white LED technology. For its application needs, equal-pitch flat Fresnel lens is designed. Compared with traditional lens, Fresnel lens has several advantages including strong focus ability, short focal length, thin thickness, light weight, low cost, etc. The optical concentration ratio, the optical e?ciency and the spot size of these Fresnel lenses are analyzed respectively with different parameters by means of Trace pro. Furthermore, the concentration performance is discussed at different incident angles. The results indicate that this kind of Fresnel lens could be used as an antenna of high-gain and small field, and the optical e?ciency could be obtained to be 92.1%.
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