X波段微波环行器的设计与实现
发布时间：2019-01-09 12:47
【摘要】：铁氧体环行器作为一种重要的非互易微波器件,由于其正向传输、反向隔离的特性,常被应用于雷达系统中,能够解决发射接收共用同一副天线的问题。在航空、航天、航海、电子、通讯、医疗等领域,环行器已经得到了广泛应用。结合实际需求,本文选择X波段波导结环行器为研究对象。首先提出了波导结环行器的设计指标,并对波导结环行器的相关理论从铁氧体材料、网络分析、场分析、以及等效电路方面进行了介绍,为后续的设计与分析提供了重要的理论依据。在此基础上先是利用圆盘形阻抗变换器设计波导结环行器,随后将环行器设计成部分高度双三角形铁氧体中心结形式,并采用三角形金属板阻抗变换器来实现环行器的阻抗匹配,解决了带宽不足缺点。为使结构紧凑,并对加工误差可调节,引入了 T-Y结构和三螺钉匹配器。对选择的设计方案及计算模型应用HFSS软件进行仿真优化,分析并确定了环行器的基本器件尺寸。波导结环行器的机械设计中,引入了装配台阶,并将腔壳、匹配块与装配台阶设置为一体化加工而成的结构,降低了加工难度,提高了装配效率。同时将磁场孔内陷于匹配块中,有效减小了环行器的体积。然后使用SolidWorks软件进行波导结环行器加工图的绘制,最后加工出实物并完成了测试。测试结果表明,本文所设计的X波段波导结环行器性能优良,在9.1GHz～10.5GHz频段内,各项指标满足系统要求(插入损耗0.3dB,隔离度20dB,VSWR1.25)。
[Abstract]:As an important non-reciprocal microwave device, ferrite circulator is often used in radar system because of its forward transmission and reverse isolation, which can solve the problem of transmitting and receiving the same antenna. Circulators have been widely used in aviation, aerospace, navigation, electronics, communications, medical and other fields. According to the actual demand, X-band waveguide junction circulator is chosen as the research object in this paper. First, the design index of waveguide junction circulator is put forward, and the related theory of waveguide junction circulator is introduced from the aspects of ferrite material, network analysis, field analysis and equivalent circuit. It provides an important theoretical basis for subsequent design and analysis. First, a waveguide junction circulator is designed by using a disk impedance converter, and then the circulator is designed as a partially high double triangle ferrite central junction. Triangle metal plate impedance converter is used to realize impedance matching of circulator, which solves the shortage of bandwidth. In order to make the structure compact and the machining error adjustable, T-Y structure and three screw matcher are introduced. The selected design scheme and calculation model are simulated and optimized by HFSS software, and the basic device size of the circulator is analyzed and determined. In the mechanical design of waveguide junction circulator, the assembly step is introduced, and the cavity shell, matching block and assembly step are set up as the structure of integrated machining, which reduces the processing difficulty and improves the assembly efficiency. At the same time, the volume of the circulator is reduced effectively by placing the magnetic hole in the matching block. Then the SolidWorks software is used to draw the machining diagram of the waveguide junction circulator. Finally, the material object is machined and the test is completed. The test results show that the designed X-band waveguide junction circulator has good performance. In the 9.1GHz~10.5GHz band, the parameters meet the system requirements (insertion loss 0.3 dB, isolation 20 dB VSW1.25).
【学位授予单位】：南京信息工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN621
本文编号：2405650
[Abstract]:As an important non-reciprocal microwave device, ferrite circulator is often used in radar system because of its forward transmission and reverse isolation, which can solve the problem of transmitting and receiving the same antenna. Circulators have been widely used in aviation, aerospace, navigation, electronics, communications, medical and other fields. According to the actual demand, X-band waveguide junction circulator is chosen as the research object in this paper. First, the design index of waveguide junction circulator is put forward, and the related theory of waveguide junction circulator is introduced from the aspects of ferrite material, network analysis, field analysis and equivalent circuit. It provides an important theoretical basis for subsequent design and analysis. First, a waveguide junction circulator is designed by using a disk impedance converter, and then the circulator is designed as a partially high double triangle ferrite central junction. Triangle metal plate impedance converter is used to realize impedance matching of circulator, which solves the shortage of bandwidth. In order to make the structure compact and the machining error adjustable, T-Y structure and three screw matcher are introduced. The selected design scheme and calculation model are simulated and optimized by HFSS software, and the basic device size of the circulator is analyzed and determined. In the mechanical design of waveguide junction circulator, the assembly step is introduced, and the cavity shell, matching block and assembly step are set up as the structure of integrated machining, which reduces the processing difficulty and improves the assembly efficiency. At the same time, the volume of the circulator is reduced effectively by placing the magnetic hole in the matching block. Then the SolidWorks software is used to draw the machining diagram of the waveguide junction circulator. Finally, the material object is machined and the test is completed. The test results show that the designed X-band waveguide junction circulator has good performance. In the 9.1GHz~10.5GHz band, the parameters meet the system requirements (insertion loss 0.3 dB, isolation 20 dB VSW1.25).
【学位授予单位】：南京信息工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN621
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