基于超材料的太赫兹分波器的研究

Research on Terahertz Band Demultiplexer Based on Metamaterials

本文提出了一种基于超材料的太赫兹分波器,其结构单元由上下两层“一”字型金属线以及中间的石英介质构成。此分波器工作在太赫兹通信窗口,将中心频率为0.225 THz和0.300 THz的两束太赫兹波分离,其隔离度分别为34 dB、47 dB,插入损耗分别为0.19 dB、0.04 dB,分波器的群延迟稳定。另外,也对分波器的等效参数以及结构参数变化进行了仿真分析。结果表明,所设计的太赫兹分波器具有插入损耗小、隔离度大、群延迟稳定等特点,且性能指标受参数变化的影响较小,在太赫兹通信系统中具有较好的应用前景。

This paper proposes a terahertz demultiplexer based on metamaterials;its unit cell is composed of two layers of"one"shaped metal wires and a quartz substrate in the middle.The terahertz demultiplexer works in the terahertz communication window and demultiplexes two beams of terahertz waves with center frequencies of 0.225 THz and 0.300 THz.The isolation of the terahertz demultiplexer is 34 dB and 47 dB,and its insertion loss is 0.19 dB and 0.04 dB,respectively.The group delay of the demultiplexer was relatively stable.Finally,the influence of the effective and structural parameters of the demultiplexer on its performance are discussed.This terahertz demultiplexer has low insertion loss,large isolation,and stable group delay,and its performance is less affected by parameter changes.It has significant application prospects in practical terahertz communication systems.