一种工作于太赫兹频段的石墨烯天线

摘要

To overcome the shortcomings of metal manufacturing technology in terahertz band,a graphene-based patch antenna which works at 1.0 THz was designed according to graphene characteristics in this operation band.Using graphene surface conductivity model based on random phase approximation(RPA),the relationship of surface conductivity,frequency(terahertz) and chemical potential was studied,and physical parameters of graphene was determined.The antenna structure consists of graphene patches,a polyimide substrate and a ground plane.Through the optimization of HFSS,its dimension is 220 μm×140 μm×9 μm.Graphene-based patch antenna operates in 0.98~1.02 THz,and it has a-10 dB relative impedance bandwidth of 4.0 % and gets a gain of 7.32 dB in maximum radiating direction.In addition,the designed antenna has good advantages of small size,light weight,stable mechanical properties,simple structure and easy integration.%为克服金属材料在太赫兹频段的工艺不足,利用石墨烯在该频段的特性,设计了一款工作于1.0 THz的石墨烯贴片天线.根据随机相位近似(RPA)的石墨烯表面电导率模型,研究了面电导率与频率(太赫兹波段)以及化学势的变化关系,确定了石墨烯材料的物理参数.该天线结构由石墨烯贴片,聚酰亚胺衬底和地板组成.利用HFSS软件优化,其尺寸仅为220 μm×140 μm×9 μm.石墨烯贴片天线工作频段为0.98~1.02 THz,-10 dB相对阻抗带宽为4.0 %,最大辐射方向上的增益达7.32 dB.此外,该天线具有尺寸小,轻便,机械性能稳定,结构简单且易集成的特点.