面向新疆奇台110 m射电望远镜宽带双极化Vivaldi馈源设计  

Broadband Dual-polarization Vivaldi Feed Design for QTT 110 m Radio Telescope

作　　者：刘海文 齐欢欢 张小林[2] 马军[3] LIU Hai-wen;QI Huan-huan;ZHANG Xiao-lin;MA Jun(School of Information and Communication Engineering,Xi'an Jiaotong University,Xi'an 710049;East China Research Institute of Electronic Engineering,Hefei 230088;Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011)

机构地区：[1]西安交通大学信息与通信工程学院,西安710049 [2]华东电子工程研究所,合肥230088 [3]中国科学院新疆天文台,乌鲁木齐830011

出　　处：《天文学报》2024年第1期1-8,共8页Acta Astronomica Sinica

基　　金：国家自然科学基金项目(U1831201、62171363);国家重点研发计划项目(2017YFE0128200);陕西省重点研发计划国际科技合作计划重点项目(2022KWZ-15);陕西省深空探测智能信息技术重点实验室(2021SYS-04)资助。

摘　　要：射电望远镜一般要在宽频段内进行连续观测,但传统相控阵天线设计方法难以兼顾宽频带和大角度扫描特性.紧耦合天线的设计方法为宽带大角度扫描天线提供了新的设计思路,基于此设计了一款宽带双极化Vivaldi相控阵馈源.首先结合Wheeler提出的连续电流片概念及等效电路对紧耦合原理进行理论分析,然后针对Vivaldi天线分析了阵元间的强耦合能够有效拓展天线的工作带宽.在此基础上设计了一款宽带Vivaldi相控阵馈源.馈源阵列由8×9 Vivaldi天线阵元组成,该阵列的工作带宽为2-8GHz,并且能够在E面和H面均实现±45∘的扫描特性.最后对该馈源阵列进行了样机加工和测试,测试结果与仿真结果具有较好的一致性.Radio telescopes usually conduct continuous observation across a wide frequency range,but traditional phased array antenna designs struggle to meet the requirements of both wide band and large scanning volume.The development of tightly coupled antennas offers a novel approach for addressing these challenges.Accordingly,a wideband dual-polarized Vivaldi phased array feed has been designed.Firstly,a theoretical analysis of the tightly coupled principle is conducted,incorporating Wheeler's concept of continuous current and equivalent circuit.It reveals that the strong coupling between the antenna elements effectively expands the operational bandwidth of the Vivaldi phased array.Based on this,a wideband Vivaldi phased array feed composed of 8×9 Vivaldi antenna elements with a operational frequency ranging from 2 to 8 GHz is designed.Furthermore,the phased array enables 45∘scanning characteristics in both E-plane and H-plane.Finally,a prototype of the phased array is fabricated and measured.The measurement results are in good agreement with the simulated ones.

关 键 词：仪器 望远镜 技术:射电天文 技术:Vivaldi天线 

分 类 号：P111[天文地球—天文学]