宽带波纹圆锥喇叭天线的研究

发布时间：2018-01-08 23:05

本文关键词：宽带波纹圆锥喇叭天线的研究　出处：《西安电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：本文结合科研项目需求，对宽带波纹圆锥喇叭天线进行了深入的研究，并已用于工程实际，具有重要的工程实用价值。基于宽带波纹喇叭天线的设计理论，设计了工作于S、C和Ku波段的三种宽带喇叭天线。在馈电结构上采用脊波导拓宽工作带宽；通过方圆过渡实现矩形脊波导与圆锥喇叭之间的模式转换；在喇叭辐射器上，采用轴向开槽的结构实现良好的圆对称性方向图和稳定的相位中心。工作于S波段圆锥喇叭，通过同轴-脊波导转换器馈电，辐射喇叭采用普通的小张角圆锥结构，其口径面最大半径只有51mm，结构简单紧凑，易于加工。仿真结果表明，其工作带宽达到2:1的倍频程，在频带内驻波比低于1.7，增益大于8dB，辐射器方向图在相同频点处的E面、H面3dB波瓣宽度差值小于8dB，即圆对称性良好，并且有稳定的相位中心。设计的C波段波纹圆锥喇叭，通过同轴-脊波导转换器馈电，辐射喇叭采用轴向开槽结构，其口径面最大半径为58mm。仿真结果表明，其相对带宽达到66.7%，在频带内电压驻波比低于1.7，增益大于10dB。通过轴向开槽，使得方向图具有良好的圆对称性，副瓣电平低于-17dB，前后抑制比很高，相位中心稳定度高。对于Ku波段波纹喇叭天线，通过同轴-脊波导转换器馈电，辐射喇叭采用轴向开槽结构，在转换器与喇叭之间加入了波导滤波器，其口径面最大半径为20mm。仿真结果表明，其相对带宽达到40%，在频带内驻波比低于1.7，增益大于10dB，，副瓣电平低于-18dB，前后抑制比高于20dB，方向图在相同频点处的E面、H面3dB波瓣宽度差值小于9.6dB，即圆对称性良好，并且相位中心非常稳定。三种天线的测量结果与仿真结果具有良好的一致性，各项性能指标均很好地满足设计要求。
[Abstract]:In the light of the requirements of scientific research project , this paper deeply researches the horn antenna of broadband ripple cone , and has been used in engineering practice and has important practical value . Based on the design theory of wide band corrugated horn antenna , three kinds of broadband horn antennas working in S , C and Ku bands are designed . A ridge waveguide is adopted to widen the working bandwidth on the feeding structure , and the mode conversion between the rectangular ridge waveguide and the conical horn is realized by means of the square circle transition , and a good circular symmetry direction map and a stable phase center are realized by adopting an axially slotted structure on the horn radiator . The results show that its operating bandwidth is 2 : 1 , the maximum radius of its aperture plane is only 51mm , its structure is simple and compact , its structure is simple and compact , it is easy to process . The simulation results show that its operating bandwidth is less than 1.7 , the gain is more than 8dB , the difference of the width of H - plane 3 dB lobe is less than 8 dB , that is , the circular symmetry is good , and there is stable phase center . The designed C - band corrugated conical horn is fed through a coaxial - ridge waveguide converter , and the radiating horn adopts an axial slotted structure , the largest radius of the aperture surface is 58 mm . The simulation results show that the relative bandwidth reaches 66.7 % , the voltage standing wave ratio in the frequency band is lower than 1.7 and the gain is greater than 10dB . The directional diagram has good circular symmetry , the side lobe level is lower than -17dB , the front - back suppression ratio is high , and the phase center stability is high . In the case of Ku - band corrugated horn antenna , a coaxial - ridge waveguide converter is used to feed the radiating horn . A waveguide filter is added between the converter and the horn . The maximum radius of the aperture surface is 20 mm . The simulation results show that the relative bandwidth of the antenna is 40 % , the gain is higher than 1 . 7 , the gain is more than -18dB , the difference between the front - to - back suppression ratio is higher than 20 dB , the difference of the width of the H - plane 3 dB lobe is less than 9.6 dB , that is , the circular symmetry is good , and the phase center is very stable . The measurement results of the three antennas have good agreement with the simulation results , and all the performance indexes meet the design requirements well .

【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN823

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