基于液晶材料的带宽可重构毫米波滤波器  

Bandwidth reconfigurable millimeter wave filter based on liquid crystal

作　　者：傅子豪 王振 刘宇鹏 李潇雨 蒋迪 张天良a FU Zihao;WANG Zhen;LIU Yupeng;LI Xiaoyu;JIANG Di;ZHANG Tianliang(School of Aeronautics and Astronautics,University of Electronic Science and Technology of China,Chengdu Sichuan 611731,China;School of Information and Communication Engineering,University of Electronic Science and Technology of China,Chengdu Sichuan 611731,China;State Key Laboratory of Millimeter Waves,Southeast University,Nanjing Jiangsu 210096,China)

机构地区：[1]电子科技大学航空航天学院,四川成都611731 [2]电子科技大学信息与通信工程学院,四川成都611731 [3]东南大学毫米波国家重点实验室,江苏南京210096

出　　处：《太赫兹科学与电子信息学报》2020年第1期95-98,共4页Journal of Terahertz Science and Electronic Information Technology

基　　金：国家自然科学基金资助项目(61501091);四川省科技支撑计划资助项目(2017GZ0312);毫米波国家重点实验室开放课题(K201704)

摘　　要：根据液晶材料在毫米波段良好的介电特性和调谐能力,设计了一款基于液晶材料的毫米波带宽可重构宽带带通滤波器。滤波器使用一个高通滤波器和一个低通滤波器级联实现带通效果;在低通部分加载液晶材料,通过调谐液晶材料的等效介电常数改变低通滤波器的响应频率,实现带宽的可重构。仿真结果表明,当调谐液晶介电常数从2.4变化到3.8时,滤波器的高频截止频率从52 GHz下降至48 GHz,相对带宽从84.9%变为78.3%。A millimeter-wave bandwidth reconfigurable broadband pass filter based on Liquid Crystal(LC)material is designed according to LC's good dielectric properties and tuning ability in millimeter-wave band.The filter is composed of a high-pass filter and a low-pass filter to achieve the band-pass effect and loads liquid crystal materials in the low-pass part.Bandwidth reconfiguration is achieved by tuning the equivalent dielectric constant of liquid crystal materials to change the response frequency of low-pass filters.The simulation results show that when the dielectric constant of the tunable liquid crystal is from 2.4 to 3.8,the high cut-off frequency of the filter has decreased from 52 GHz to 48 GHz,the relative bandwidth has changed from 84.9%to 78.3%.

关 键 词：液晶调谐 带宽可重构 带通滤波器 毫米波 

分 类 号：TN713[电子电信—电路与系统]