太赫兹液晶反射阵列移相单元的设计与分析  

Design and analysis of Liquid Crystal-based reflectarray phase shifting cells in THz band

作　　者：葛忆[1] 夏天雨[2] 杨军[2] 邓光晟[2] 尹治平[2] 桑磊[1] GE Yi;XIA Tianyu;YANG Jun;DENG Guangcheng;YIN Zhiping;SANG Lei(School of Computer and Information Hefei University of Technology,Hefei Anhui 230009,China;Academy of Photoelectric Technology,Hefei University of Technology,Hefei Anhui 230009,China)

机构地区：[1]合肥工业大学计算机与信息学院,安徽合肥230009 [2]合肥工业大学光电技术研究院,安徽合肥230009

出　　处：《太赫兹科学与电子信息学报》2017年第2期187-191,共5页Journal of Terahertz Science and Electronic Information Technology

基　　金：国家自然科学基金资助项目(51607050)

摘　　要：为了满足高增益天线大的移相度和可工作在太赫兹频段,设计了一种基于液晶的双偶极子反射移相单元结构。采用液晶的等效介电常数模型,在频率为335~345 GHz频段均产生360o以上的相移,在342 GHz实现最大相移390o。为了减小液晶不均匀性对相移产生的影响,建立了单元的精确模型,该模型在频率范围为330~338 GHz时均产生了250o以上的相移,在336 GHz实现最大相移285o。与均匀液晶等效介电常数模型相比,产生最大相移的频率点发生了变化,并且产生了最大为105o的移相差值,这在相控反射阵列天线的设计中是不可忽略的。In order to make the high-gain antenna have a large phase shift and can work in the THz band,a reflectarray element based on Liquid Crystals(LC)is designed to operate in the frequency range from270GHz to390GHz.When the phases of reflectarray element are calculated with a constant value of the permittivity,the elements produce a dynamic phase range above360o in335-345GHz,and achieve the maximum390o at342GHz.Then,in order to reduce the influence of liquid crystal inhomogeneity onthe phase shifting,an accurate model of liquid crystal-based reflectarray cells is established.The accurate modeling produces a dynamic phase range above250o in330-338GHz,and achieves the maximum285oat336GHz.Compared with the equivalent permittivity modeling,the accurate modeling has a maximum phase error of105o,which cannot be ignored in the reconfigurable reflectarray antennas design.

关 键 词：反射阵列 双偶极子 液晶 太赫兹 移相单元 

分 类 号：TN820.15[电子电信—信息与通信工程]