Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/32964
Title: EFFICIENT ANALYSIS OF MICROWAVE POLARIZER WITH FINITE METALLIZATION THICKNESS AND NOVEL DESIGN OF POLARIZATION ROTATOR
Authors: ANG TENG WAH
Keywords: meanderline polarizer, polarization rotator, mode matching, transverse resonance technique, polarizer measurement, generalized scattering matrix
Issue Date: 29-Nov-2011
Source: ANG TENG WAH (2011-11-29). EFFICIENT ANALYSIS OF MICROWAVE POLARIZER WITH FINITE METALLIZATION THICKNESS AND NOVEL DESIGN OF POLARIZATION ROTATOR. ScholarBank@NUS Repository.
Abstract: Microwave polarizers are used extensively in commercial and military applications as they provide an effective means to convert electromagnetic waves from one polarization state/angle to another desired polarization state/angle. In this dissertation, a novel polarizer rotator design which minimizes the number of rotating mechanism while maintaining good cross polarization isolation is proposed. The design, which is based on back-to-back stacking of two 90deg polarizer incorporated with a linear grid layer, is simple to implement as it requires no more than two rotating mechanism. The viability of the proposed concept is validated by the good agreement between measured results and prediction. In addition to a good design concept, it is equally critical that the method used for analyzing the microwave polarizer is accurate and efficient. Currently, the numerical techniques used for the design and analysis of microwave polarizers either do not take into account the finite metallization thickness of the meanderline grid or requires excessive computation time. For microwave polarizer operating at high frequencies or constructed from heavy metal cladding, the omission of grid thickness will result in relative error between the actual and predicted performance. In this dissertation, a new method for analyzing microwave polarizer that takes into account the finite metallization thickness is presented. The method utilizes transverse resonance coupled with generalized scattering matrix and singular value decomposition to achieve a highly efficient algorithm suitable for design optimization routine. Numerical accuracy and efficiency of the proposed approach were validated by comparison with measurement results and finite element method.
URI: http://scholarbank.nus.edu.sg/handle/10635/32964
Appears in Collections:Ph.D Theses (Open)

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