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Finite-element analysis of microwave passive devices and ferrite-tuned antennas.

机译：微波无源器件和铁氧体调谐天线的有限元分析。

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This dissertation deals with the formulation of a vector finite element method for the analysis of microwave circuits, electronic packages and ferrite-tuned cavity-backed slot antennas. A generalized eigenvalue problem is first formulated to examine the dispersive propagation characteristics of two-dimensional anisotropic and lossy microwave structures. Quantities such as the propagation constant, attenuation constant, characteristic impedance and field distribution of metallic traces on single and multiple substrates are evaluated. Information obtained from the solution of the eigenvalue problem is subsequently used for the analysis of complex planar microwave circuits and electronic packages. The resulting S-parameters are used to evaluate the electrical performance of the structure. At microwave frequencies, parasitic effects due to packaging, wire bonding and poor grounding may significantly alter the respective S-parameters of the original circuit.; The finite element method is then hybridized with a mixed spectral/spatial domain method of moments and diffraction theory to calculate scattering and radiation characteristics of cavity-backed slots mounted on infinite and finite ground planes with a possible dielectric or magnetic overlay. The cavity may also be filled with magnetized ferrites, thus providing tuning capabilities through altering the externally bias field. Predictions of the radiation characteristics of ferrite-tuned antennas are compared with measurements performed in the anechoic chamber. Finally, the finite element method is used to simulate wave propagation through a perfectly matched layer placed at the boundary of the computational domain to absorb propagating waves in the outward direction. The effectiveness, efficiency and accuracy of this truncation technique is thoroughly investigated through numerical simulations.
机译：本文研究了一种矢量有限元方法，用于分析微波电路，电子封装和铁氧体调谐腔背缝隙天线。首先提出广义特征值问题，以研究二维各向异性和有损微波结构的色散传播特性。评估诸如单个和多个基板上的金属迹线的传播常数，衰减常数，特征阻抗和场分布之类的数量。从特征值问题的解决方案中获得的信息随后用于分析复杂的平面微波电路和电子封装。所得的S参数用于评估结构的电气性能。在微波频率下，由于封装，引线键合和不良接地引起的寄生效应可能会大大改变原始电路的各个S参数。然后将有限元方法与力矩/衍射理论的混合频谱/空间域方法混合，以计算安装在无限和有限接地平面上且具有可能的介电或磁性覆盖层的背腔槽的散射和辐射特性。空腔中也可以充满磁化铁氧体，从而通过改变外部偏置磁场来提供调谐能力。将铁氧体调谐天线的辐射特性预测与在消声室内进行的测量进行比较。最后，使用有限元方法模拟波通过位于计算域边界处的完美匹配层的传播，以吸收向外传播的波。通过数值模拟对这种截断技术的有效性，效率和准确性进行了深入研究。

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