一种基于天线-移相器-天线单元结构的双宽带线圆极化器  

Dual-broadband Linear-to-circular Polarizer Based on Antenna-filter-Antenna Unit Cell Structure

作　　者：陆艺文 童宣锋 曾维民 薛晓马 安睿 蒋之浩 LU Yiwen;TONG Xuanfeng;ZENG Weimin;XUE Xiaoma;AN Rui;JIANG Zhihao(School of Information Science and Engineering,Southeast University,Nanjing 211189,Jiangsu,China;Taiyuan Satellite Launch Center,Taiyuan 030027,Shanxi,China)

机构地区：[1]东南大学信息科学与工程学院,江苏南京211189 [2]太原卫星发射中心,山西太原030027

出　　处：《上海航天（中英文）》2024年第3期187-194,共8页Aerospace Shanghai（Chinese&English）

基　　金：国家自然科学基金(62122019)。

摘　　要：线圆极化转换器在卫星通信天线系统中可发挥重要作用,针对K/Ka频段卫星通信的需求,采用天线-移相器-天线(AFA)结构,通过独立设计双频带内接收和发射天线,提出了一款双频宽带线圆极化器。通过堆叠贴片的方式引入新的谐振点,从而拓展极化器的工作带宽。所设计的极化器单元尺寸为0.4λ_(K)×0.37λ_(K)×0.27λ_(K),可在K波段将入射x方向线极化波转换为右旋圆极化波,并在Ka波段将入射y方向线极化波转换为左旋圆极化波。实测结果表明:在保证入射角为0°~25°范围内,该极化器响应稳定,在K和Ka波段的工作带宽分别为9.8%(18.3~20.2 GHz)和7.8%(28.5~30.82 GHz)。Linear-to-circular polarizers can play an important role in the antenna systems for satellite communications.In view of the requirements of K/Ka-band satellite communications,in this paper,a dual-broadband linear-to-circular polarizer is proposed,in which the antenna-filter-antenna(AFA)structure is adopted and the dual-band receiving and transmitting antennas are independent.In particular,the working bandwidth can be expanded by stacking the patches,resulting in a unit cell size of 0.4λ_(K)×0.37λ_(K)×0.27λ_(K).With the polarizer,an incident x-polarized wave can be converted into a right-hand circular-polarized(RHCP)wave at the K-band,whereas an incident y-polarized wave can be converted into a left-hand circular-polarized(LHCP)wave at the Ka-band.A polarizer prototype is fabricated and tested.The measured results indicate that the operating bandwidth of the polarizer is 9.8%(18.3~20.2 GHz)and 7.8%(28.5~30.82 GHz)within the incidence angle ranging from 0°to 25°.

关 键 词：卫星通信 极化器 双频 天线-移相器-天线(AFA) 宽带 

分 类 号：TN927[电子电信—通信与信息系统]