Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"mode matching technique"”.
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Analysis and characterization of the integrated dielectric slab waveguide-wedge antenna using iterative mode-matching technique
… is presented. The method of solution involves modeling the wedge as a sequence of step discontinuities and using an iterative procedure to track forward and backward partial wave fields, expressed as modal expansions, to obtain the rigorous field solution. Radiation patterns of directive gain …
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Electromagnetic Analysis of Horn Antennas in the Terahertz region
… with the application of electromagnetic modelling techniques to the analysis of horn antenna characteristics over the terahertz range, 0.1 THz to 5 THz. The mode matching technique based on a scattering matrix approach to describe beam propagation in both the forward and backward …
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An Investigation of Modal Characteristics and Discontinuities in Printed Circuit Transmission Lines (Microstrip, Galerkin, Singular, Integral, Coupled-Mode)
… First, propagating and evanescent modes of a shielded microstrip are calculated using the spectral Galerkin technique. The characteristic impedance and field configurations of these modes are also calculated. These modes are then used in a mode matching technique, in order to …
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Finite Element Analysis Of Left-handed Waveguides
… waveguides and anomalous dispersion of modes is found. The discontinuity structure of a left-handed waveguide sandwiched between two conventional dielectric slab waveguides is analyzed using mode matching technique and the results are discussed based on the inherent nature of the …
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Analysis of the Suspended H-Waveguide and Other Related Dielectric Waveguide Structures
… developed suspended H-waveguide based on the mode matching techniques is described. The derived eigenvalue equation for determining the propagation constant of this waveguide structure is very general and can be applied directly to other planar dielectric structures of rectangular cross …
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Variable permittivity dielectric material loaded stepped-horn antenna
… to unloaded empty one. A hybrid numerical technique is used to analyze such an antenna. The tapered section of the horn antenna is modeled by multi-stepped waveguide structures filled with variable dielectric constant material. Generalized scattering matrix representation of the tapered …
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Investigation of Horn Optimisation, Simulation and Measurement Techniques, with Application to Integrating Cavity Based Pixel Design
… by placing further constraints on the various models that currently exist which serve to explain these processes, for example the various in ationary models. Significant efforts are being made to develop and characterise the technology required to realise these ambitions. Examples of missions …
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Quasi-Optical Design and Analysis of Bolometric Interferometers for Cosmic Microwave Background Experiments
… low and difficult to measure that very accurate modelling and a deep understanding and characterisation of the instruments used to make such measurements is essential. The two instruments investigated in this thesis are the Millimetre-Wave Bolometric Interferometer (MBI) and the Q and U …
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Modal and radiation characteristics of the crossed-septum dielectric loaded waveguide for wideband applications
… cross sectional geometry that can support single-mode propagation over the desired bandwidth. This dissertation presents a novel method of obtaining bandwidth enhancement of a square waveguide using both dielectric loading and mode filters that retains the 90 degree rotational symmetry. By placing …