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摘要移相器作为相控雷达天线阵中的关键元件，通过改变天线孔径的相位分布实现波束的扫描，其体积、性能及造价等对雷达至关重要。本文设计的相位可调移相器通过外加磁场改变铁氧体的磁导率，进而改变电磁波的相速得到不同的相移量。41680
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设计工作主要有：（1）根据理论计算出铁氧体薄膜移相器的相关参数，设计的移相器以YIG（钇铁石榴石）为基片，GGG（钆镓榴石）为外延沉底材料。移相器的中心频率为10GHz，插入损耗小于1dB；（2）对移相器进行仿真，在理论基础上进行分析及优化，使其获得更大的相移范围。
最终的结果显示，优化后的铁氧体薄膜移相器在 （X波段62.5%的频带）的频段上插入损耗小于1dB，移相器的相移差平均为102 ，起伏不超过7 。
毕业论文关键词 X波段 Ansoft HFSS 铁氧体材料 移相器
毕业设计说明书外文摘要
Title The simulation and design of ferrite film Phase shifter in the X-band
Abstract
Phase shifter as key components in phased array radar antenna, by changing the phase distribution on the antenna aperture beam scanning, the size, performance and cost of the radar is very important.In this paper, the phase of design of adjustable phase shifter through additional magnetic field changes of ferrite magnetic permeability, can make a big difference to the phase velocity of electromagnetic wave to get the amount of phase shift is different.Design work mainly include the following: (1) according to the theory to calculate the related parameters of ferrite thin film phase shifter, design a YIG (YIG) as substrate, GGG (gadolinium gallium garnet) as the epitaxial sink material of ferrite thin film phase shifter.Phase shifter center frequency of 10 GHZ, insertion loss is less than 1 db (2) to the simulation of phase shifter, on the basis of theoretical analysis and optimization, the greater range of phase shift.Results show that the optimized ferrite film phase shifter in 62.5% (x-band frequency band) on the spectrum of insertion loss is less than 1 db, the differential phase shift phase shifter for an average of 102 , and no more than 7 .
Keywords The x-band Ansoft HFSS phase shifter
目 次
1 引言 1
1.1 研究背景及意义 1
1.2 移相器的发展及国内外研究现状 1
1.3 论文结构安排4
2 微带铁氧体薄膜移相器的理论基础6
2.1 铁氧体材料基础理论6
2.2 微带线的基础理论 8
2.3 铁氧体移相器设计分析10
3 铁氧体薄膜移相器的设计 12
3.1 铁氧体薄膜移相器的基本思路12
3.2 设计目标 13
4 铁氧体薄膜移相器的分析和优化 14
4.1 HFSS软件的介绍 14
4.2 材料的选择及结构参数 14
4.3 微带线尺寸计算 14
4.4 建模及仿真 15
4.5 分析及优化 19
结论 32
参考文献 33