微波薄膜移相器的设计
发布时间：2019-05-22 04:23
【摘要】：微波移相器是改变微波信号相位的器件,普遍应用于微波通信、相控阵雷达等领域。本文主要对微波薄膜移相器的原理做了理论研究,对微波薄膜移相器做了设计,讨论了移相器各部分的尺寸变化对器件性能的影响。根据铁氧体材料的旋磁特性设计了铁氧体薄膜移相器。铁氧体材料的磁导率显示了张量特性,当外加磁场的强度和方向变化时,铁氧体的磁导率也将会发生改变,从而改变了铁氧体的传播常数,也就改变了电磁波的传播特性,这样就产生了相移,相移的大小受到恒稳磁场的控制。薄膜材料和基片材料采用的是YIG(钇铁石榴石)和GGG(钆镓石榴石),导体材料采用的是金。分析了已有的几种薄膜移相器,对它们的原理和结构进行了研究,设计出了一种基于共面波导结构的铁氧体移相器。根据微波平面传输理论和对旋磁材料特性的分析,获得波动传输方程,计算出了移相器的各部分尺寸。对铁氧体材料、基片材料和金属导体材料进行了筛选,研究了移相器的传输特性,对移相器各部分尺寸进行了设计、仿真和优化。利用HFSS软件对共面波导结构的性能进行了模拟仿真,对移相器各部分尺寸做了优化,研究了中心导线的宽度、共面波导间隙、薄膜厚度以及电极的厚度等参数对器件性能的影响。研究结果表明:所设计的移相器在50GHz中心频率下得到了较好的性能,插入损耗小于2dB,电压驻波比小于1.5。
[Abstract]:Microwave phase shifters are devices that change the phase of microwave signals and are widely used in microwave communication, phased array radar and other fields. In this paper, the principle of microwave thin film phase shifters is studied theoretically, the microwave thin film phase shifters are designed, and the influence of the size change of each part of the phase shifters on the performance of the devices is discussed. According to the rotating magnetic characteristics of Ferrite materials, the phase shifters of Ferrite thin films were designed. The permeability of Ferrite material shows the characteristic of Zhang Liang. When the intensity and direction of applied magnetic field change, the permeability of Ferrite will also change, thus changing the propagation constant of Ferrite, which also changes the propagation characteristic of electromagnetic wave. In this way, the phase shift is produced, and the size of the phase shift is controlled by the constant magnetic field. The thin film materials and substrate materials are YIG (yttrium iron garnet) and GGG (gadolinium gallium garnet), and the conductor materials are gold. Several kinds of thin film phase shifters are analyzed, their principle and structure are studied, and a Ferrite phase shifter based on coplanar waveguide structure is designed. According to the microwave plane transmission theory and the analysis of the characteristics of rotating magnetic materials, the wave transmission equation is obtained, and the dimensions of each part of the phase shifter are calculated. Ferrite materials, substrate materials and metal conductor materials were screened, the transmission characteristics of phase shifters were studied, and the dimensions of each part of the phase shifters were designed, simulated and optimized. The performance of coplanar waveguide structure is simulated by HFSS software, and the size of each part of the phase shifter is optimized. the width of the central conductor and the gap between the coplanar waveguides are studied. The effects of film thickness and electrode thickness on the performance of the device. The results show that the designed phase shifters have good performance at the central frequency of 50GHz, the insertion loss is less than 2dB, and the VSWR is less than 1.5.
【学位授予单位】：杭州电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN623
[Abstract]:Microwave phase shifters are devices that change the phase of microwave signals and are widely used in microwave communication, phased array radar and other fields. In this paper, the principle of microwave thin film phase shifters is studied theoretically, the microwave thin film phase shifters are designed, and the influence of the size change of each part of the phase shifters on the performance of the devices is discussed. According to the rotating magnetic characteristics of Ferrite materials, the phase shifters of Ferrite thin films were designed. The permeability of Ferrite material shows the characteristic of Zhang Liang. When the intensity and direction of applied magnetic field change, the permeability of Ferrite will also change, thus changing the propagation constant of Ferrite, which also changes the propagation characteristic of electromagnetic wave. In this way, the phase shift is produced, and the size of the phase shift is controlled by the constant magnetic field. The thin film materials and substrate materials are YIG (yttrium iron garnet) and GGG (gadolinium gallium garnet), and the conductor materials are gold. Several kinds of thin film phase shifters are analyzed, their principle and structure are studied, and a Ferrite phase shifter based on coplanar waveguide structure is designed. According to the microwave plane transmission theory and the analysis of the characteristics of rotating magnetic materials, the wave transmission equation is obtained, and the dimensions of each part of the phase shifter are calculated. Ferrite materials, substrate materials and metal conductor materials were screened, the transmission characteristics of phase shifters were studied, and the dimensions of each part of the phase shifters were designed, simulated and optimized. The performance of coplanar waveguide structure is simulated by HFSS software, and the size of each part of the phase shifter is optimized. the width of the central conductor and the gap between the coplanar waveguides are studied. The effects of film thickness and electrode thickness on the performance of the device. The results show that the designed phase shifters have good performance at the central frequency of 50GHz, the insertion loss is less than 2dB, and the VSWR is less than 1.5.
【学位授予单位】：杭州电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN623
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