全金属缝隙天线在PAF馈源中的应用

The Design and Analyze on Phased Array Feed Element for Radio Astronomy

对直线缝隙天线进行了理论分析、仿真和优化设计,并制作出实验样机单元。从天线馈电部分分析入手,采用同轴探针馈电方式,内导体利用多个匹配环来改善工作带宽。与传统直线缝隙天线相比,天线主体增加了腔体缝隙结构,实现了天线样机4~12 GHz频段三个倍频程的带宽,E和H面方向图仿真与测试基本一致。全频段最大增益值在4~8 dBi之间,达到了宽带阵列天线的设计要求,为平方公里阵列射电望远镜馈源的应用提供了可能的选择。

The linearly tapered slot antenna is theoretically analyzed,simulated and optimized in this paper.To verify the theoretical performance,a prototype of the proposed antenna was manufactured and tested.In the design process,to enhance the impedance bandwidth,the coaxial probe feeding method was adopted as a feed part of the antenna,multiple matching rings was used as inner conductor,as well as cavity gap structure was introduced to the antenna body.Compared with the traditional linear slot antenna,the proposed antenna structure was realized three octaves of frequency bands over 412 GHz.The simulation of E-plane and H-plane of the radiation patterns of the antenna is verified with the measurement,the maximum gain is ranging between 48 dBi over the full frequency band.The final antenna geometry is optimized and formed by using built-in software optimization tool which satisfies several design requirements.The performance of the antenna confirms that it is a potential candidate as a feed option for SKA dish prototype.