摘要
设计了一种工作在4GHz^8GHz的基于平衡馈电的宽波束中心脊喇叭馈源。馈源的中心脊为十字形,位于喇叭中心。四个同轴探针旋转对称分布,外导体连接喇叭壁,内导体与十字形中心脊的四个脊片分别连接,通过向正对的同轴探针馈入等幅反相的差分信号实现平衡馈电,抑制高次模的产生。中心脊波导喇叭截止频率较低的前三个模式分别为TE11模,TE21L模和TE21U模式,其中,TE11模是馈源的主模式。针对馈源的模式分布分析馈源具有宽带特性的原因。在喇叭口面位置加载三个优化设计的轴向波纹槽,获得稳定的宽波束辐射方向图。设计的馈源在频带范围内VSWR<1.9,–3dB波束宽度>51.5°,E面和H面交叉极化<-30dB,相位中心变化<0.32λ(λ为4GHz对应的波长)。
An octave wide beamwidth central quad-ridged horn feed based on balanced feed over 4 GHz^8 GHz is designed in this paper.The central quad-ridge of the feed located at the center of the horn is cross-shaped.The external conductors of the four coaxial probes are connected to the horn wall,and internal conductors insert into central quad-ridge rotating symmetrically.Balanced feeding is achieved by feeding two coaxial probes in opposite directions with differential signals of constant amplitude and inverse-phase,which suppresses the excitation of higher order modes.The three axial corrugated slots are applied at the edge of horn aperture to obtain a stable wide beamwidth radiation pattern.The first three modes with relatively low cut-off frequencies,TE11,TE21 L,TE21 U.TE11 is the dominant mode of the feed.Mode analysis explains the reason why the feed has broadband.The designed feed has VSWR<1.9,-3 dB beamwidth>51.5°within the frequency band,E plane,and H plane cross polarization<-30 dB,and the variation range of the phase center is less than 0.32λ(λis the wavelength at 4 GHz).
作者
张雪
王正鹏
ZHANG Xue;WANG Zhengpeng(School of Electronic and Information Engineering,Beihang University,Beijing 100191,China)
出处
《遥测遥控》
2020年第5期1-5,28,共6页
Journal of Telemetry,Tracking and Command
基金
国防科技项目基金(0101161)。
关键词
平衡馈电
倍频程
宽波束
紧缩场馈源
Balanced feed
Octave
Wide beamwidth
Compact range feed
