Ka频段宽带圆极化微带天线  

Ka-band broadband circularly polarized microstrip antenna

作　　者：李小刚 金荣洪[1] 梁仙灵[1] 金泽阳 李建平[1] 贺冲[1] 陈靖峰[1] LI Xiaogang;JIN Ronghong;LIANG Xianling;JIN Zeyang;LI Jianping;HE Chong;CHEN Jingfeng(Department of Electronic Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学电子工程系,上海200240

出　　处：《电波科学学报》2022年第6期1073-1079,共7页Chinese Journal of Radio Science

基　　金：国家自然科学基金青年基金(62001291)。

摘　　要：面向Ka频段高通量卫星对天线的需求,设计了一种Ka频段宽带圆极化微带天线.天线单元主要由圆形辐射贴片和缝隙耦合馈电结构组成,通过两个类T形缝隙结合实现宽带圆极化.天线仅有三层金属层,结构简单.仿真结果显示,天线单元的相对阻抗带宽为31.5%(25.1~34.5 GHz),相对3 dB轴比带宽为20.3%(26.5~32.5 GHz).由于单元尺寸较小,不便于对其性能进行验证,因此利用该天线单元组成2×2天线阵列,并进行加工测试.仿真与试验结果表明,天线阵列阻抗带宽以及3 dB轴比带宽可以覆盖25.6~33.1 GHz频率范围,实测结果与仿真结果一致性良好.Aiming at the demand of Ka-band high-throughput satellites for antennas,a Ka-band broadband circularly polarized microstrip antenna is designed.The antenna element is mainly composed of a circular radiating patch and a slot-coupled feed structure,where broadband circular polarization is achieved through the combination of two T-like slots.The antenna has only three metal layers and the structure is simple.The simulation results show that the relative impedance bandwidth of the antenna element is 31.5%(25.1−34.5 GHz),and the relative 3 dB axial ratio bandwidth is 20.3%(26.5−32.5 GHz).Due to the small size of the element,it is inconvenient to verify the performance of the designed antenna element,so it is used to form a 2×2 antenna array,and the processing test is carried out.Simulation and test results show that the antenna array impedance bandwidth and 3 dB axial ratio bandwidth can cover the 25.6−33.1 GHz frequency band,and the measured results are in good agreement with the simulation results.

关 键 词：KA频段 卫星通信 圆极化 微带天线 阵列 

分 类 号：TN822.8[电子电信—信息与通信工程]