Analysis of coupling, guiding and radiation mechanisms on several microwave structures

Yau, Desmond. (2001). Analysis of coupling, guiding and radiation mechanisms on several microwave structures PhD Thesis, School of Information Technology and Electrical Engineering, The University of Queensland.

       
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Author Yau, Desmond.
Thesis Title Analysis of coupling, guiding and radiation mechanisms on several microwave structures
School, Centre or Institute School of Information Technology and Electrical Engineering
Institution The University of Queensland
Publication date 2001-09
Thesis type PhD Thesis
Supervisor Prof Nick Shuley
Dr. Glen Stickley
Total pages 161
Collection year 2001
Language eng
Subjects L
291705 Microwave and Millimetrewave Technology
700100 Computer Software and Services
Formatted abstract The rapid development of communication systems and the impending traffic congestion of RF spectrum have led to an expansion in frequency usage towards the millimeter wave and sub-millimeter wave bands. In dealing with high frequency spectra in these bands, the conventional fabrication technology for microwave integrated circuit (MWIC) such as microstrip technology no longer applies, primarily because of high transmission loss. Although low-loss transmission media such as dielectric waveguide structures can be used as alternatives, they are difficult to fabricate and integrate with passive or active devices. This results in a growing interest in combining the advantages of microstrip and dielectric waveguide technologies. One of the most common implementations of interconnecting these two dissimilar structures is offered by aperture coupling. The theme of this dissertation is to introduce a rigorous formulation for modeling the coupling between microstrip and open-dielectric related structures (rectangular dielectric resonator antenna and image guide) via an aperture. The model is the first major rigorous method published for analyzing such types of coupling structures. The method is based on a surface integral equation approach by which the dielectric waveguide is modeled as equivalent surface electric and magnetic currents and subsequently treated via a set of combined field integral equations (CFIE). The microstrip structure and the associated coupling mechanism are formulated using the mixed potential integral equation (MPIE) approach. The coupled integral equations are then solved by the method of moments (MoM) in the spatial domain using Galerkin's procedure. Closed-form Green's functions are employed in the calculation to enhance numerical efficiency. The model is demonstrated to be a very versatile and is a practical design tool with the ability to perform accurate full-wave analysis very efficiently. The key to formulating 3-D open-dielectric waveguide structures is the introduction of the hybrid basis functions technique for modeling propagating and scattered fields associated with a guiding structure. It is based on the use of a combination of sub-domain (rooftop) and travelling wave basis functions to represent the irregular and modal surface currents on the dielectric. The technique was first applied to a 2-D planar guided structure (microstrip leaky wave antenna) before it was expanded to the 3-D geometry. The consequence of this technique is far-reaching as it has made possible a MoM analysis of 3-D finite open-dielectric waveguides that has not been reported.
Keyword Microwave communication systems
Dielectric wave guides
Antennas (Electronics)

 
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