一种面向卫星通信的共口径双频双圆极化介质谐振器天线  

A shared-aperture dual-band dual-circularly polarized dielectric resonator antenna for satellite communication

作　　者：罗伟[1,2] 幸运颉 刘梅林 何鑫 LUO Wei;XING Yunjie;LIU Meilin;HE Xin(School of Electronics Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Chongqing Institute of Digital Arena,Chongqing 400025,China)

机构地区：[1]重庆邮电大学光电工程学院,重庆400065 [2]重庆数字赛道研究院,重庆400025

出　　处：《电波科学学报》2024年第6期1073-1082,共10页Chinese Journal of Radio Science

基　　金：中国博士后科学基金(2022MD723726)。

摘　　要：针对卫星互联网对于高速频分双工通信需求,提出了一种可用于地面终端的共口径双频双圆极化介质谐振器天线(dielectric resonator antenna, DRA)。通过对高频的圆柱介质谐振器和低频的环形柱介质谐振器进行嵌套设计,实现上下行天线单元的共口径功能;利用双探针方法在介质谐振器内部激励简并模式,并借助控制简并模之间的相位差分别在低频与高频产生相互正交的圆极化波;通过对环形柱介质谐振器的厚度进行结构优化削弱异频电磁互耦,从而有效解决低频方向图畸形问题,并且改善阻抗匹配。基于顺序旋转方法建立2×2天线阵列,并进行了样机加工测试。测试结果显示,低频左旋圆极化(left-hand circular polarization, LHCP)工作带宽为25.5%(14.4~18.6 GHz),高频右旋圆极化(right-hand circular polarization, RHCP)工作带宽为6.5%(26.8~28.6GHz)。该共口径天线的小型化特征和稳定辐射性能可以应用于车载与机载等卫星通信设备。An aperture-shared dual-band dual-circularly polarized dielectric resonator antenna(DRA)is proposed for ground terminals in response to the demand for high-speed frequency division duplex communication in satellite internet.By embedding the high-frequency cylindrical dielectric resonators into the low-frequency annular cylindrical dielectric resonators,the aperture-shared function is achieved.Using the dual-probe method to excite the degenerate mode inside the dielectric resonator,orthogonal circularly polarized waves are generated at low and high frequencies by controlling the phase difference between the degenerate modes.In order to weaken the electromagnetic coupling between different frequencies,the thickness of the circular cylindrical dielectric resonator is optimized to effectively solve the problem of low-frequency pattern distortion and improve impedance matching.Furthermore,a 2×2 antenna array is established based on the sequential rotation method,and a prototype is manufactured and measured.The results show that the operating bandwidth of low-frequency left-hand circular polarization(LHCP)is 25.5%(14.4-18.6 GHz),and high-frequency right-hand circular polarization(RHCP)is 6.5%(26.8-28.6 GHz).The miniaturization characteristics and stable radiation performance of this aperture-shared antenna can be applied to satellite communication equipment such as in vehicle and airborne systems.

关 键 词：卫星通信 介质谐振器天线(DRA) 双频 双圆极化 共口径 

分 类 号：TN827[电子电信—信息与通信工程]