Parameter Estimation of Microwave Filters

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Description

The focus of this thesis is on developing theories and techniques to extract lossy microwave filter parameters from data. In the literature, the Cauchy methods have been used to extract filters’ characteristic polynomials from measured scattering parameters. These methods are described and some examples are constructed to test their performance. The results suggest that the Cauchy method does not work well when the Q factors representing the loss of filters are not even. Based on some prototype filters and the relationship between Q factors and the loss, we conduct preliminary studies on alternative representations of the characteristic polynomials. The parameters ... continued below

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ix, 62 pages : illustrations (some color)

Creation Information

Sun, Shuo December 2015.

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This thesis is part of the collection entitled: UNT Theses and Dissertations and was provided by UNT Libraries to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 35 times . More information about this thesis can be viewed below.

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  • Sun, Shuo

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Description

The focus of this thesis is on developing theories and techniques to extract lossy microwave filter parameters from data. In the literature, the Cauchy methods have been used to extract filters’ characteristic polynomials from measured scattering parameters. These methods are described and some examples are constructed to test their performance. The results suggest that the Cauchy method does not work well when the Q factors representing the loss of filters are not even. Based on some prototype filters and the relationship between Q factors and the loss, we conduct preliminary studies on alternative representations of the characteristic polynomials. The parameters in these new models are extracted using the Levenberg–Marquardt algorithm to accurately estimate characteristic polynomials and the loss information.

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ix, 62 pages : illustrations (some color)

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UNT Theses and Dissertations

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  • December 2015

Added to The UNT Digital Library

  • March 20, 2016, 10:34 a.m.

Description Last Updated

  • May 24, 2017, 10:26 a.m.

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Citations, Rights, Re-Use

Sun, Shuo. Parameter Estimation of Microwave Filters, thesis, December 2015; Denton, Texas. (digital.library.unt.edu/ark:/67531/metadc822826/: accessed November 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .