摘要随着电子科学技术的不断发展,多频率通信的出现;军事电子对抗的不断升级,这都要求滤波器覆盖很宽的频带且能够灵活的选频,可调滤波器因此而生。
本文提出了一种可调谐YIG薄膜带通滤波器,其滤波原理为静磁表面波的激励与传输。文中首先介绍了铁氧体材料的一些基本性质,讲述了微波在铁氧体中传播的基本理论;其次讲述了所提出的滤波器的结构以及设计指标,其中,具有T型微带线的滤波器中心频率调谐范围为1.48GHz至2.31GHz,3dB带宽为120MHz,具有L型微带线的滤波器的中心频率调谐范围为5.075GHz至6.875GHz,3dB带宽为110MHz,文中还分别对两种不同微带线结构的滤波器的几个比较重要的几何参数如影响耦合程度的微带线间距e等进行了分析,然后对滤波器进行了仿真,也对滤波器互易性进行了讨论。仿真结果表明,本文所提出的滤波器基本符合设计指标,滤波器具有互易性。文中所使用的仿真软件为HFSS 15.0。27624
关键词 YIG薄膜 调谐 带通滤波器 换能器 静磁表面波
毕业论文设计说明书外文摘要
Title The design and simulation of YIG filters
Abstract
With the continuous progress of science and technology,the appearance of multi-frequency communication and the military electronic warfare continues to deteriorate,all of these require the filter to cover a wide band and choose the frequency flexibly,tunable filters come into being.
This paper presents a magnetically tunable bandpass filters with YIG films,the principle of which is the excitation and transmission of magnetostatic surface wave.At first,the paper introduces some basic properties of the ferrite material and describes the basic theory of how microwaves propagate in the ferrite.Secondly states about the structure and the index of the proposed filter,the filter with T-shaped microstrips has a central frequency range of 1.48GHz to 2.31GHz, a 3dB bandwidth of 120MHz ,the filter with L-shaped microstrips has a central frequency range of 5.075GHz to 6.875GHz, and a 3dB bandwidth of 110MHz.This paper also has simulations of the two filters with different shaped microstrips.Then several important geometrical parameters are discussed ,such as the distance between two microstips which influences the coupling degree.Also,the reciprocity of the filter is discussed.The simulation results indicate that the proposed filter is in line with the design specifications,and the filter has reciprocity.The simulation software used in this passage is HFSS 15.0.
Keywords YIG film tunable bandpass filters transducers magnetostatic surface wave
目 次
1 引言(或绪论) 1
1.1 钇铁石榴石(YIG)介绍 1
1.2 YIG滤波器的组成与分类 2
1.3 国内外研究现状 4
1.4 本文的主要工作以及文章结构 5
2 微波在铁氧体中的传播 6
2.1 亚铁磁材料的基本性质 6
2.2 微波在铁氧体中传播的基本理论 9
3 具有T型微带线的带通滤波器 11
3.1 滤波器的设计 11
3.2 参数变量分析 12
3.3 仿真结果 18
3.4 3dB带宽与中心频率 21
3.5 滤波器的互易性研究 23
4 具有L型微带线的的带通滤波器 25
4.1 滤波器的设计 25
4.2 参数变量分析 26
4.3 仿真结果 30
4.4 3dB带宽与中心频率 32
结论 34
致谢 35
参考文献 36
1 引言(或绪论)
随着电子科学技术的不断发展,人们在微波技术领域取得了不可小觑的进步。但是随着进步一起出现的是更加复杂的空间电子环境。空间中存在着各种各样用途的无线网络,例如民用移动通信;军用电子对抗、敌我识别等等。把这些信号都转化成数字信号再进行信号处理显得太过麻烦,于是人们需求在复杂的电子环境中在微波频段对模拟信号的直接处理,YIG滤波器应运而生。 YIG调谐滤波器的仿真设计:http://www.751com.cn/tongxin/lunwen_22148.html