为适应C频段卫星测控通信车载天线机动布站功能,须研制一种轴向尺寸小于1.2m的小型化天馈系统,针对该问题,对关键组件线/圆极化器进行小型化设计。在理论分析极化器原理的基础上,采用在聚四氟乙烯基材上打孔的方法使一种介质实现多种相...为适应C频段卫星测控通信车载天线机动布站功能,须研制一种轴向尺寸小于1.2m的小型化天馈系统,针对该问题,对关键组件线/圆极化器进行小型化设计。在理论分析极化器原理的基础上,采用在聚四氟乙烯基材上打孔的方法使一种介质实现多种相对介电常数,设计了C频段收、发均覆盖575 MHz带宽的小型化宽带极化器,在56%相对带宽内实现小型化,轴向尺寸缩短至常规极化器的1/3,经HFSS(High Frequency Simulation Software,高频仿真软件)仿真计算,并与同频段常规极化器性能进行分析比较,结果表明:该极化器移相量与匹配性能良好,满足指标与使用要求。展开更多
设计了一个K波段圆极化器,其工作频率为18至26.5 GHz。K波段包含多条重要的射电天文分子谱线,此波段圆极化器的研制对于天文观测与科学研究有极其重要的意义。圆极化器用于将线极化波转换为圆极化波以便于射电望远镜进行观测。包括其工...设计了一个K波段圆极化器,其工作频率为18至26.5 GHz。K波段包含多条重要的射电天文分子谱线,此波段圆极化器的研制对于天文观测与科学研究有极其重要的意义。圆极化器用于将线极化波转换为圆极化波以便于射电望远镜进行观测。包括其工作原理、设计要点、模型仿真结果等内容。主要着眼于正交模式转换器与移相器这两个圆极化器中的重要器件,通过工作原理分析以及电磁仿真的方法进行器件的具体设计并得出仿真结果。仿真结果各个端口回波损耗均小于-20 d B,且移相器的移相误差小于3.3°。展开更多
天马望远镜Ka波段宽带接收机是研究恒星形成、星际介质以及深空探测的重要观测平台。论述了接收机核心器件Ka波段宽带圆极化器的研制过程。该器件由90°两壁波纹移相器和改进型双脊波导形式的正交模式耦合器构成,工作频带为26.5~40 ...天马望远镜Ka波段宽带接收机是研究恒星形成、星际介质以及深空探测的重要观测平台。论述了接收机核心器件Ka波段宽带圆极化器的研制过程。该器件由90°两壁波纹移相器和改进型双脊波导形式的正交模式耦合器构成,工作频带为26.5~40 GHz,相对带宽达到41%。首先介绍了圆极化器的应用背景及工作原理,继而进行模型设计和仿真优化,最后进行结构设计和样品实测。实测结果显示,移相器的相移误差为90±4°,轴比达到0.6 d B,正交模式耦合器的交叉极化为-26 d B,隔离度为-35 d B,器件端口驻波均低于-18 d B,实测结果与设计仿真相符。展开更多
Purpose An S-band dual circular polarizer has been designed and tested with low power in the paper,which will be applied in a spherical cavity pulse compressor.It converts the TE10 mode in rectangular waveguide into t...Purpose An S-band dual circular polarizer has been designed and tested with low power in the paper,which will be applied in a spherical cavity pulse compressor.It converts the TE10 mode in rectangular waveguide into two polarization degenerated TE11 modes in cylindrical waveguide.Methods The general scattering matrix of the dual circular polarizer has been deduced based on the properties of the passive microwave network,which is suitable for the usual 3 dB coupler,as well as the left/right hand circular polarizer.Based on the 3D code software CST,the dual circular polarizer was numerically simulated.Then,two prototypes have been manufactured and tested with the vector network analyzer(VNA).Results The simulation results show that the magnitudes and phase difference of the two TE11 modes are dB and 89.79 degrees,respectively.The cold test results show good agreement with CST simulation.−3.0103/−3.0104 Conclusion The method of analyzing the relationship between the voltage standing wave ratio(VSWR)and the errors of the magnitudes and phase difference of the two TE11 modes was given,which can be used to qualitatively analyze the properties of the circular polarizer.The S-band waveguide dual circular polarizer can be applied in the pulse compressor,phase shifter or other frequency bands.展开更多
文摘为适应C频段卫星测控通信车载天线机动布站功能,须研制一种轴向尺寸小于1.2m的小型化天馈系统,针对该问题,对关键组件线/圆极化器进行小型化设计。在理论分析极化器原理的基础上,采用在聚四氟乙烯基材上打孔的方法使一种介质实现多种相对介电常数,设计了C频段收、发均覆盖575 MHz带宽的小型化宽带极化器,在56%相对带宽内实现小型化,轴向尺寸缩短至常规极化器的1/3,经HFSS(High Frequency Simulation Software,高频仿真软件)仿真计算,并与同频段常规极化器性能进行分析比较,结果表明:该极化器移相量与匹配性能良好,满足指标与使用要求。
文摘设计了一个K波段圆极化器,其工作频率为18至26.5 GHz。K波段包含多条重要的射电天文分子谱线,此波段圆极化器的研制对于天文观测与科学研究有极其重要的意义。圆极化器用于将线极化波转换为圆极化波以便于射电望远镜进行观测。包括其工作原理、设计要点、模型仿真结果等内容。主要着眼于正交模式转换器与移相器这两个圆极化器中的重要器件,通过工作原理分析以及电磁仿真的方法进行器件的具体设计并得出仿真结果。仿真结果各个端口回波损耗均小于-20 d B,且移相器的移相误差小于3.3°。
文摘天马望远镜Ka波段宽带接收机是研究恒星形成、星际介质以及深空探测的重要观测平台。论述了接收机核心器件Ka波段宽带圆极化器的研制过程。该器件由90°两壁波纹移相器和改进型双脊波导形式的正交模式耦合器构成,工作频带为26.5~40 GHz,相对带宽达到41%。首先介绍了圆极化器的应用背景及工作原理,继而进行模型设计和仿真优化,最后进行结构设计和样品实测。实测结果显示,移相器的相移误差为90±4°,轴比达到0.6 d B,正交模式耦合器的交叉极化为-26 d B,隔离度为-35 d B,器件端口驻波均低于-18 d B,实测结果与设计仿真相符。
基金Supported by the Youth Found of National Natural Science Foundation of China(11505199).
文摘Purpose An S-band dual circular polarizer has been designed and tested with low power in the paper,which will be applied in a spherical cavity pulse compressor.It converts the TE10 mode in rectangular waveguide into two polarization degenerated TE11 modes in cylindrical waveguide.Methods The general scattering matrix of the dual circular polarizer has been deduced based on the properties of the passive microwave network,which is suitable for the usual 3 dB coupler,as well as the left/right hand circular polarizer.Based on the 3D code software CST,the dual circular polarizer was numerically simulated.Then,two prototypes have been manufactured and tested with the vector network analyzer(VNA).Results The simulation results show that the magnitudes and phase difference of the two TE11 modes are dB and 89.79 degrees,respectively.The cold test results show good agreement with CST simulation.−3.0103/−3.0104 Conclusion The method of analyzing the relationship between the voltage standing wave ratio(VSWR)and the errors of the magnitudes and phase difference of the two TE11 modes was given,which can be used to qualitatively analyze the properties of the circular polarizer.The S-band waveguide dual circular polarizer can be applied in the pulse compressor,phase shifter or other frequency bands.