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Three dimensional vector finite element analysis of microwave devices containing anisotropic materials.

机译：包含各向异性材料的微波装置的三维矢量有限元分析。

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摘要

This thesis presents vector finite element solution methods for the electromagnetic fields in microwave devices containing anisotropic materials. The research focuses on microwave ferrite materials which represent a special case of anisotropy where the permeability tensor is Hermitian in the lossless case. Both two and three dimensional finite element computations are performed. Vector finite elements are used to avoid the occurrence of spurious nodes. In two dimensions, the propagation characteristics of ferrite loaded guiding structures are found and the resulting field patterns are presented. The three dimensional analysis computes the scattering parameters of microwave circulators. Circulators represent a common ferrite loaded microwave device that are often used in transmit/receive modules. The ferrite permeability tensor's dependance on externally applied bias fields results in a spatial inhomogeneity that is readily accommodated in the finite element method. Static bias fields are computed using a commercially available three dimensional nonlinear finite element solution procedure. The calculated static fields are then used in the high frequency analysis to compute the local permeability tensor within each tetrahedral finite element. Scattering parameters and field plots of the circulators are presented. The scattering parameters show good agreement with measured data. Including non-uniform static bias fields in the high-frequency analysis opens the door to design improvements based on shaped bias fields.
机译：本文提出了包含各向异性材料的微波装置中电磁场的矢量有限元求解方法。研究集中在代表各向异性的特殊情况的微波铁氧体材料上，在无损情况下磁导率张量是Hermitian。同时执行二维和三维有限元计算。矢量有限元用于避免虚假节点的出现。在二维中，找到了铁氧体加载的导向结构的传播特性，并给出了所得的场模式。三维分析计算了微波环行器的散射参数。循环器代表一种常见的加载铁氧体的微波设备，通常在发射/接收模块中使用。铁氧体磁导率张量对外部施加的偏置场的依赖性导致空间不均匀性，该不均匀性很容易在有限元方法中得到解决。静态偏置场是使用可商购的三维非线性有限元求解程序计算的。然后，将计算出的静态场用于高频分析中，以计算每个四面体有限元内的局部渗透率张量。介绍了环行器的散射参数和场图。散射参数与测量数据显示出良好的一致性。在高频分析中包括非均匀静态偏置场为基于成形偏置场的设计改进打开了大门。

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  • 作者

    Anderson, Brian Clark.;

  • 作者单位

    Carnegie Mellon University.;

  • 授予单位 Carnegie Mellon University.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 1996
  • 页码 73 p.
  • 总页数 73
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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