微波铁氧体隔离器的仿真设计

摘要在微波器件中，隔离器占据着重要地位，隔离器有两个端口，但它却具有单向传输的特点。隔离器使得波可以几乎无损耗地从正向传输通过，但是反向传输时波会遭遇到极大的衰减，这样就起到隔离的作用。隔离器可以从原理上分为好几种，有谐振式，场移式，经环形器改造成的隔离器以及法拉第旋转式等等。
本文旨在设计两种结构较为简单的矩形波导隔离器，谐振式隔离器与场移式隔离器。均采用在矩形波导内的合适位置插入铁氧体片，设置铁氧体的结构以及性能参数，模拟场的分布，最终得到优化的模型结构的方法。第一种是谐振式隔离器，仅在矩形波导内插入铁氧体片，第二种是场移式隔离器，还在铁氧体片的侧面加载了薄电阻片。
重点关注这两个隔离器的正向传输系数与反向传输系数，正向传输系数应该尽可能地接近于零，而反向波在工作频带内有较大的衰减。隔离性能与铁氧体片插入的位置以及铁氧体片的厚度，材质参数有关，还与铁氧体片上加载的偏置磁场的强度有关。25605
关键词铁氧体隔离器矩形波导谐振式场移式正向传输系数反向传输系数隔离度
毕业论文设计说明书外文摘要
Title     Design of a Ferrite Microwave Isolator
Abstract
In microwave devices, the isolator is a device that occupies the important position . Isolator has two ports, but it has the characteristics of one-way transmission.Isolator can make waves almost losslessly transmit through, but the reverse transmission wave will encounter great attenuation. Isolator can be pided into several kinds, resonant, field displacement, Faraday rotary and so on.
The paper aims to design two kinds of rectangular waveguide isolators. Resonant isolator is a kind of field displacement.Insert ferrite into the right position in the rectangular waveguide , perform parameters of ferrite, simulate the field distribution and optimize model structure in the end.
Focus on the positive and reverse transmission coefficient. Positive transmission coefficient should be close to zero as much as possible, and backward wave attenuate greatly at working frequency band. Isolation is related to the model structure, also with the position of the ferrite piece, and the thickness of the ferrite slices, the material parameters, and the load on the ferrite slices and the intensity of the bias magnetic field.
Keywords ferrite isolator rectangle waveguide   resonant field displacement positive transmission coefficient reverse transmission coefficient
目次
1 绪论   1
1.1 隔离器简介   1
1.2 隔离器的发展历史   2
1.3 国内外研究情况及意义   3
1.4 论文的主要内容   4
2 隔离器基本原理   5
2.1亚铁磁性材料   5
2.2插入铁氧体后的波导中的TEm0模   7
3 谐振式隔离器   10
3.1 谐振式隔离器简介   10
3.2谐振式隔离器的具体设计   10
3.3谐振式隔离器的优化   12
4 场移式隔离器   18
4.1场移式隔离器简介   18
4.2场移式隔离器的具体设计   19
4.3场移式隔离器的优化   20
结论   26
致谢   29
参考文献   30
1 绪论
1.1 隔离器简介微波铁氧体隔离器的仿真设计:http://www.751com.cn/tongxin/lunwen_19471.html