Analysis of Waveguide Discontinuities by the Method of Moments
Analysis of Waveguide Discontinuities by the Method of Moments

Author: Hesham Auda

Publisher:

Published: 1984

Total Pages: 264

ISBN-13:

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Three systems of waveguide discontinuities are considered. The first system is that of multiple apertures of arbitrary shape in the transverse plane between two cylindrical waveguides. The second system consists of metallic obstacles in a rectangular waveguide that are uniform along the narrow side of waveguide but are otherwise of arbitrary shape and thickness, i.e., a system of inductive posts. The third system consists of metallic obstacles in a rectangular waveguide that are uniform along the broad side of the waveguide, but are otherwise of arbitrary cross section and thickness, i.e., a system of capacitive posts. Common between the first and second systems are the inductive windows and strips in a rectangular waveguide, and between the first and third systems are the capacitive windows and strips in a rectangular waveguide.

Analysis of Discontinuities in a Rectangular Waveguide Using Dyadic Green's Function Approach in Conjunction with Method of Moments
Analysis of Discontinuities in a Rectangular Waveguide Using Dyadic Green's Function Approach in Conjunction with Method of Moments

Author: National Aeronautics and Space Administration (NASA)

Publisher: Createspace Independent Publishing Platform

Published: 2018-08-20

Total Pages: 28

ISBN-13: 9781722083205

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The dyadic Green's function for an electric current source placed in a rectangular waveguide is derived using a magnetic vector potential approach. A complete solution for the electric and magnetic fields including the source location is obtained by simple differentiation of the vector potential around the source location. The simple differentiation approach which gives electric and magnetic fields identical to an earlier derivation is overlooked by the earlier workers in the derivation of the dyadic Green's function particularly around the source location. Numerical results obtained using the Green's function approach are compared with the results obtained using the Finite Element Method (FEM). Deshpande, M. D. Langley Research Center NAS1-19341; RTOP 522-33-11-02...

Fractal Apertures in Waveguides, Conducting Screens and Cavities
Fractal Apertures in Waveguides, Conducting Screens and Cavities

Author: Basudeb Ghosh

Publisher: Springer

Published: 2014-06-12

Total Pages: 208

ISBN-13: 3319065351

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This book deals with the design and analysis of fractal apertures in waveguides, conducting screens and cavities using numerical electromagnetics and field-solvers. The aim is to obtain design solutions with improved accuracy for a wide range of applications. To achieve this goal, a few diverse problems are considered. The book is organized with adequate space dedicated for the design and analysis of fractal apertures in waveguides, conducting screens and cavities, microwave/millimeter wave applications followed by detailed case-study problems to infuse better insight and understanding of the subject. Finally, summaries and suggestions are given for future work. Fractal geometries were widely used in electromagnetics, specifically for antennas and frequency selective surfaces (FSS). The self-similarity of fractal geometry gives rise to a multiband response, whereas the space-filling nature of the fractal geometries makes it an efficient element in antenna and FSS unit cell miniaturization. Until now, no efforts were made to study the behavior of these fractal geometries for aperture coupling problems. The aperture coupling problem is an important boundary value problem in electromagnetics and used in waveguide filters and power dividers, slotted ground planes, frequency selective surfaces and metamaterials. The present book is intended to initiate a study of the characteristics of fractal apertures in waveguides, conducting screens and cavities. To perform a unified analysis of these entirely dissimilar problems, the “generalized network formulation of the aperture problems” by Mautz and Harrington was extended to multiple-aperture geometry. The authors consider the problem of coupling between two arbitrary regions coupled together via multiple apertures of arbitrary shape. MATLAB codes were developed for the problems and validated with the results available in the literature as well as through simulations on ANSOFT's HFSS.

Passive Microwave Components and Antennas
Passive Microwave Components and Antennas

Author: Vitaliy Zhurbenko

Publisher: BoD – Books on Demand

Published: 2010-04-01

Total Pages: 568

ISBN-13: 9533070838

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Modelling and computations in electromagnetics is a quite fast-growing research area. The recent interest in this field is caused by the increased demand for designing complex microwave components, modeling electromagnetic materials, and rapid increase in computational power for calculation of complex electromagnetic problems. The first part of this book is devoted to the advances in the analysis techniques such as method of moments, finite-difference time- domain method, boundary perturbation theory, Fourier analysis, mode-matching method, and analysis based on circuit theory. These techniques are considered with regard to several challenging technological applications such as those related to electrically large devices, scattering in layered structures, photonic crystals, and artificial materials. The second part of the book deals with waveguides, transmission lines and transitions. This includes microstrip lines (MSL), slot waveguides, substrate integrated waveguides (SIW), vertical transmission lines in multilayer media as well as MSL to SIW and MSL to slot line transitions.

Advances in Information Technologies for Electromagnetics
Advances in Information Technologies for Electromagnetics

Author: Luciano Tarricone

Publisher: Springer Science & Business Media

Published: 2022-07-18

Total Pages: 473

ISBN-13: 1402047495

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This book offers a broad panorama on recently achieved and potentially obtainable advances in electromagnetics with innovative IT technologies. Simple tutorial chapters introduce cutting edge technologies. These include parallel and distributed computing, object-oriented technologies, grid computing, semantic grids, agent based computing and service-oriented architectures. The book is a unique tool bridging the gap between IT and EM communities.