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Dissertations / Theses on the topic 'Leaky modes'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 January 2023

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1

Mansuripur, Masud, Miroslav Kolesik, and Per Jakobsen. "Leaky modes of dielectric cavities." SPIE-INT SOC OPTICAL ENGINEERING, 2016. http://hdl.handle.net/10150/622709.

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In the absence of external excitation, light trapped within a dielectric medium generally decays by leaking out-and also by getting absorbed within the medium. We analyze the leaky modes of a parallel-plate slab, a solid glass sphere, and a solid glass cylinder, by examining those solutions of Maxwell's equations (for dispersive as well as non-dispersive media) which admit of a complex-valued oscillation frequency. Under certain circumstances, these leaky modes constitute a complete set into which an arbitrary distribution of the electromagnetic field residing inside a dielectric body can be e
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Mansuripur, Masud, Miroslav Kolesik, and Per Jakobsen. "Leaky modes of solid dielectric spheres." AMER PHYSICAL SOC, 2017. http://hdl.handle.net/10150/625335.

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In the absence of external excitation, light trapped within a dielectric medium generally decays by leaking out, and also by getting absorbed within the medium. We analyze the leaky modes of solid dielectric spheres by examining solutions of Maxwell's equations for simple homogeneous, isotropic, linearly dispersive media that admit complex-valued oscillation frequencies. We show that, under appropriate circumstances, these leaky modes constitute a complete set into which an initial electromagnetic field distribution inside a dielectric sphere can be expanded. We provide the outline of a comple
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3

McPhee, Graeme. "Surface-Bound Plasmonic and Leaky Electromagnetic Modes of Metal-Dielectric Structures." Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517370.

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4

Upendar, Swaathi [Verfasser], and Thomas [Akademischer Betreuer] Weiss. "Perturbation and manipulation of leaky modes in photonic crystal fibers / Swaathi Upendar ; Betreuer: Thomas Weiss." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2020. http://d-nb.info/1222976331/34.

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5

Issa, Nader. "Modes and propagation in microstructured optical fibres." University of Sydney. Physics and Optical Fibre Technology Centre, 2005. http://hdl.handle.net/2123/613.

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Microstructured optical fibres (MOFs), also commonly called photonic crystal fibres or holey fibres, describe a type of optical fibre in which continuous channels of (typically) air run their entire length. These `holes' serve to both confine electromagnetic waves within the core of the fibre and to tailor its transmission properties. In order to understand and quantify both of these functions, a new computational algorithm was developed and implemented. It solves for the eigenvalues of Maxwell's wave equations in the two-dimensional waveguide cross-section, with radiating boundary conditions
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Piruska, Aigars. "Studies of Spectral Distortion Under ATR Condition in Spectroelectrochemical Sensor Development of Laser Induced Fluorescence Detection System for Multilane Capillary Electrophoresis Microchips." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163388232.

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7

Marinho, Leonardo Ribeiro. "Análise Completa das Fibras de Bragg de Núcleo Oco." Universidade do Estado do Rio de Janeiro, 2013. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=8141.

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A evolução nos sistemas digitais de comunicação está intrinsicamente relacionada ao desenvolvimento da tecnologia de fibras ópticas. Desde a sua criação, na década de 60, inúmeras pesquisas vem sendo realizadas com o intuito de aumentar a capacidade de informação transmitida, por meio da redução da atenuação, controle da dispersão cromática e eliminação das não-linearidades. Neste contexto, as Fibras de Bragg surgem como uma estrutura de grande potencialidade para se minimizar tais inconvenientes. As fibras de Bragg possuem um mecanismo de operação diferente em relação às fibras tradicionais d
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8

Gallezot, Matthieu. "Simulation numérique du contrôle non-destructif des guides d’ondes enfouis." Thesis, Ecole centrale de Nantes, 2018. http://www.theses.fr/2018ECDN0040/document.

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De nombreux éléments de structures de génie civil sont élancés et partiellement enfouis dans un milieu solide. Les ondes guidées sont souvent utilisées pour le contrôle non destructif (CND) de ces éléments. Ces derniers sont alors considérés comme des guides d’ondes ouverts, dans lesquels la plupart des ondes sont atténuées par des fuites dans le milieu environnant. D’autre part le problème est non borné, ce qui le rend difficile à appréhender sur le plan numérique. La combinaison d’une approche par éléments finis semi-analytique (SAFE) et de la méthode des couches parfaitement adaptées (PML)
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9

Тевяшев, А. Д., О. І. Матвієнко, and Г. Нікітенко. "Stochastic Model and Method of Optimizing the Operating Modes of a Water Network with Hidden Leaks." Thesis, Харків : ТОВ «Друкарня Мадрид», 2018. http://openarchive.nure.ua/handle/document/9410.

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10

Gneiting, Scott Alexander. "Improved Leaky-Mode Waveguide Spatial Light Modulators for Three Dimensional Displays." BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6561.

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This thesis improves on the design of the leaky-mode spatial light modulator, LMW-SLM, presented by Dr. Smalley[1]. Improvements include: input coupling gratings, a pulsed laser input, output coupling gratings, and a 3D printed adjustable module for the stabilization of critical alignments. First, input coupling gratings reduce the cost of the LMW-SLM from $500 to around $2, a drop in cost of over two orders of magnitude. This enables multiple modulators to be used in a single display and allows for an inexpensive modular design to be created. Second, a pulsed laser input allows for image crea
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11

Mikulin, Dominic Josef. "Characterising liquid crystal cells by fitting half-leaky guided mode data using genetic algorithms." Thesis, University of Exeter, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361320.

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12

Allayarov, Izzatjon [Verfasser], and Thomas [Akademischer Betreuer] Weiss. "Theory of leaky mode propagation in optical waveguide geometries / Izzatjon Allayarov ; Betreuer: Thomas Weiss." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2020. http://d-nb.info/1217253513/34.

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13

Chamorro, Alexander. "The analysis of pipeline leak tests using DEGADIS model." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=913.

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Thesis (M.S.)--West Virginia University, 1999.<br>Title from document title page. Document formatted into pages; contains ix, 123 p. : ill. (some col.), maps. Includes abstract. Includes bibliographical references (p. 64-65).
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14

Wahab, A. B. A. "A general model for leak detection in liquid petroleum pipelines." Thesis, University of East London, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376565.

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15

Ramaratham, Srivatsan. "A mathematical model for air brake systems in the presence of leaks." Texas A&M University, 2008. http://hdl.handle.net/1969.1/86043.

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This thesis deals with the development of a mathematical model for an air brake system in the presence of leaks. Brake systems in trucks are crucial for ensuring the safety of vehicles and passengers on the roadways. Most trucks in the US are equipped with S-cam drum brake systems and they are sensitive to maintenance. Brake defects such as leaks are a major cause of accidents involving trucks. Leaks in the air brake systems affect braking performance drastically by decreasing the peak braking pressures attained and also increasing the time required to attain the same, thereby resulting in lon
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16

Iolov, Alexandre V. "Parameter Estimation, Optimal Control and Optimal Design in Stochastic Neural Models." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34866.

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This thesis solves estimation and control problems in computational neuroscience, mathematically dealing with the first-passage times of diffusion stochastic processes. We first derive estimation algorithms for model parameters from first-passage time observations, and then we derive algorithms for the control of first-passage times. Finally, we solve an optimal design problem which combines elements of the first two: we ask how to elicit first-passage times such as to facilitate model estimation based on said first-passage observations. The main mathematical tools used are the Fokker-
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17

Schymanski, Stanislaus Josef. "Transpiration as the leak in the carbon factory : a model of self-optimising vegetation." University of Western Australia. School of Environmental Systems Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0095.

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18

Hauge, Espen. "Advanced leak detection in oil and gas pipelines using a nonlinear observer and OLGA models." Thesis, Norwegian University of Science and Technology, Department of Engineering Cybernetics, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-8732.

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<p>An adaptive Luenberger-type observer with the purpose of locating and quantifying leakages is presented. The observer only needs measurements of velocity and temperature at the inlet and pressure at the outlet to function. The beneficial effect of output injection in form of boundary conditions is utilized to ensure fast convergence of the observer error. This approach is different from the usual practice where output injection might appear as a part of the PDE’s. This makes it possible to employ OLGA, which is a state of the art computational fluid dynamics simulator, to govern the one-pha
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19

Zohora, Fatematuz. "Study of pipe leak fluid dynamic characteristics and their influences on acoustic emission generation." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/207823/1/Fatematuz_Zohora_Thesis.pdf.

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Developing a robust pipe leak monitoring tool is essential as it continuously monitors pipeline health without disrupting normal operation. It is critical to understand the physical phenomena in the leakage area to develop a robust pipeline condition monitoring. This research project provides a better understanding of pipe leakage fluid dynamics and their influences on acoustic emission signal generation. The findings obtained from this project lay the groundwork for the development of a robust pipeline condition monitoring technique that could be implemented without disrupting normal operatio
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20

Bahrami, Abdorrahim. "Modelling and Verifying Dynamic Properties of Neuronal Networks in Coq." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42643.

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Since the mid-1990s, formal verification has become increasingly important because it can provide guarantees that a software system is free of bugs and working correctly based on a provided model. Verification of biological and medical systems is a promising application of formal verification. Human neural networks have recently been emulated and studied as a biological system. Some recent research has been done on modelling some crucial neuronal circuits and using model checking techniques to verify their temporal properties. In large case studies, model checkers often cannot
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21

Qaderi, Kamran. "Waveguide-Based Spatial Light Modulators for Use in Holographic Video Displays." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/7054.

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Film display holograms typically diffract light over a wide enough view-angle to be viewed, directly, without intervening optics. However, all holographic video displays must use optics beyond the hologram surface to overcome the challenges of small display extent and low diffraction angle by using some form of demagnification and derotation. We report a leaky mode waveguide spatial light modulator (SLM) with sufficiently high angular diffraction to obviate the need for demagnification in scanned aperture systems. This was achieved by performing a number of experiments to determine the depth o
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22

Ekeberg, Dennis. "Corpus Technologica : En religionshistorisk analys av Robert Anton Wilsons version av The Eight Circuit Model of Consciousness i ljuset av den västerländska esoterismen." Thesis, Södertörns högskola, Institutionen för historia och samtidsstudier, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-18590.

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This is a thesis about The Eight Circuit Model, a modern mind map developed for the purpose of illumination and enlighenment by Dr. Timothy Leary in the 1970s. Later, authors such as Robert Anton Wilson and Antero Alli elaborated upon the idea to make it more wholesome and compatible with other ideas expressing the same basic principle. In short, it is an intellectual abstraction of the evolution of consciousness through a series of eight stages, which Leary called Circuits. By looking at the brain as an evolving bio-computer, with thoughts working as software, upgrading itself through neurolo
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23

Adams, Mitchell Robert. "Dual-Axis Acousto-Optic/Electro-Optic Deflectors in Lithium Niobate for Full-Parallax Holographic Video Displays." BYU ScholarsArchive, 2021. https://scholarsarchive.byu.edu/etd/9159.

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A major limitation of acousto-optic (AO) leaky-mode modulator based holographic displays is their inability to present full-parallax. We propose that full-parallax capabilities can be bestowed on these displays by integrating an electro-optic (EO) phased array into the architecture. We validated this concept by rendering computational models and by fabricating and testing a basic two-axis AO/EO deflector prototype in lithium niobate. This was, to our knowledge, the first instantiation of an integrated, hybrid AO/EO deflector. The prototype had a 6° deflection range along the AO-axis, and a 3°
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Sarver, Eric Andrew. "A Discrete Choice Mean Variance (EV) Cost Model to Measure Impact of Household Risk from Drinking Water Pipe Corrosion." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/86199.

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In traditional investment decision making, one tool commonly used is the mean variance model, also known as an expected-value variance (EV) model, which evaluates the anticipated payout of different assets with respect to uncertainty where portfolios with higher risk demand higher expected returns from an individual. This thesis adapts this framework to a cost setting where decision makers are evaluating alternative physical assets that carry lifetime cost uncertainty for maintenance. Specifically, this paper examines homeowner choices for their home plumbing systems in the event of a pinhole
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25

Gumier, Carlos Cesar. "Aplicação de modelo matematico de simulação-otimização na gestão de perda de agua em sistemas de abastecimento." [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258175.

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Orientador: Edevar Luvizotto Junior<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo<br>Made available in DSpace on 2018-08-05T06:54:25Z (GMT). No. of bitstreams: 1 Gumier_CarlosCesar_M.pdf: 3470729 bytes, checksum: 2e93f4938a5eb678d7fb52827439bbc5 (MD5) Previous issue date: 2005<br>Resumo: Este trabalho apresenta, sob diversos aspectos, as perdas de água que ocorrem nas redes de distribuição dos sistemas de abastecimento e os mecanismos de controle disponíveis. Dentre os objetivos se destaca a proposição do modelo matemáti
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Bräuer, Peter. "Extension and application of a tropospheric aqueous phase chemical mechanism (CAPRAM) for aerosol and cloud models." Doctoral thesis, Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-183743.

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The ubiquitous abundance of organic compounds in natural and anthorpogenically influenced eco-systems has put these compounds into the focus of atmospheric research. Organic compounds have an impact on air quality, climate, and human health. Moreover, they affect particle growth, secondary organic aerosol (SOA) formation, and the global radiation budget by altering particle properties. To investigate the multiphase chemistry of organic compounds and interactions with the aqueous phase in the troposphere, modelling can provide a useful tool. The oxidation of larger organic molecules to the fina
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27

Backhaus-Nousch, Katja. "Wissenschaftskarrieren in der Leibniz-Gemeinschaft und das Einflusspotenzial von egalitärem Elternzeit-Modell, familienorientiertem Arbeitsplatz und flexiblen Frauenquoten als Gleichstellungsmaßnahmen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-204810.

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Ein ausgewogenes Geschlechterverhältnis verbessert die Leistungsfähigkeit von Teams, das ökonomische Wachstum von Unternehmen und deren Innovationsfähigkeit (vgl. Europäische Kommission 2011a, S. 4f; vgl. auch Corkery & Taylor 2012, S. 9). Obwohl in vielen Organisationen und Unternehmen diese Fakten mittlerweile bekannt sind, ist das Potenzial eines ausgewogenen Frauen- und Männeranteils in mittleren und hohen Karrierestufen nach wie vor unzureichend erschlossen. So zeigen die Daten des Statistischen Bundesamtes für das Jahr 2014, dass in akademischen und wissenschaftlichen Karrierewegen der A
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Costa, Leahy Renata. "La métaphore du cintre : corps et apparition dans les défilés de mode." Thesis, Paris 10, 2018. http://www.theses.fr/2018PA100168/document.

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Les défilés de mode mettent en scène des propositions visuelles sur les corps humains, habituellement ceux des mannequins minces. Dans le contexte contemporain, elles sont vantés comme des canons de beauté, mais d’autre part sont remises en question sur la réalité de leurs formes corporelles et la qualité de leur présence et de leur action sur les podiums: elles sont souvent vus comme des cintres de vêtements. Cependant sont eux qui conforment, avec les vêtements, des figures humaines, par des attitudes qui visent la composition des types de possibilités d’apparition. Notre étude se concentre
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Miloudi, Benchaâ. "Modélisation d’écoulements de gaz raréfiés en vue de l’étude des fuites internes dans les machines volumétriques produisant des vides moyens." Valenciennes, 1994. https://ged.uphf.fr/nuxeo/site/esupversions/a557e18f-4212-4cfe-b66c-5e10a68b4a1c.

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Les fuites internes jouent un rôle très important sur les performances des machines volumétriques, en particulier sur le débit réel à l'aspiration et le vide limite qu'il est possible d'atteindre. Pour les pompes volumétriques travaillant dans le vide grossier, les écoulements de fuites internes peuvent être convenablement décrits par un modèle de fluide visqueux. En revanche, dans le vide poussé, les écoulements de fuites internes doivent être décrits dans le cadre de la théorie cinétique des gaz. Entre ces deux régimes extrêmes d’écoulement, on a affaire au régime intermédiaire pour lequel i
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30

Henrie, Andrew August. "Hardware and Software Improvements to a Low-Cost Holographic Video Monitor." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/7439.

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The "Mark V" Holographic Video Monitor ("HoloMonitor") is a continuation of effort and accomplishments to produce a low-cost device capable of reproducing true full-color horizontal-parallax-only computer-generated holograms at typical video frame-rates. While other devices around the world may have greater capabilities, these devices are currently confined to laboratory settings due to their sheer complexity and expense. The aim of this project is to provide researchers and "tinkerers" with a device capable of recreating holographic effects in full color, respectable resolution, in real time,
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31

Wang, Yunjing. "Molecular biology of flower development in Viola pubescens, a species with the chasmogamous-cleistogamous mixed breeding system." Ohio : Ohio University, 2008. http://www.ohiolink.edu/etd/view.cgi?ohiou1205379431.

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32

Bol, Kieran G. "Redundant Input Cancellation by a Bursting Neural Network." Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/20061.

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One of the most powerful and important applications that the brain accomplishes is solving the sensory "cocktail party problem:" to adaptively suppress extraneous signals in an environment. Theoretical studies suggest that the solution to the problem involves an adaptive filter, which learns to remove the redundant noise. However, neural learning is also in its infancy and there are still many questions about the stability and application of synaptic learning rules for neural computation. In this thesis, the implementation of an adaptive filter in the brain of a weakly electric fish, A. Lepto
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von, Seth Magnus. "Oxygen delivery and mitochondrial dysfunction as assessed by microdialysis during interventions in experimental sepsis." Doctoral thesis, Uppsala universitet, Anestesiologi och intensivvård, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-326788.

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Early administration of broad-spectrum antibiotics is the first goal in sepsis treatment. Besides from bacteriostatic/bactericidal effects, some antibiotics may also modify the host´s response to infection. The novel antibiotic tigecycline may exert such properties; however, this property has not been evaluated in large-animal trials. We compared tigecycline with doxycycline and placebo in relation to anti-inflammatory, circulatory and organ dysfunction effects in a sterile pig model of sepsis. Doxycycline, but not tigecycline, reduced the inflammatory response as manifested by tumor necrosis
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34

Ayadi, Abdessalem. "Vers une organisation globale durable de l’approvisionnement des ménages : bilans économiques et environnementaux de différentes chaînes de distribution classiques et émergentes depuis l’entrepôt du fournisseur jusqu’au domicile du ménage." Thesis, Lyon 2, 2014. http://www.theses.fr/2014LYO22010/document.

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La logistique urbaine, et celle du dernier kilomètre notamment, est un sujet de préoccupation majeure pour les villes d’aujourd’hui. Pour répondre à cette préoccupation, nous avons établi dans le chapitre introductif un historique de la problématique de la logistique urbaine pour mieux comprendre son développement au fil des années, permettant ainsi de déduire qu’il est fondamental d’étudier la globalité de la chaîne de distribution dans ce travail de thèse pour mieux résoudre la problématique de la logistique urbaine. En revanche, nous étions confrontés à un sujet redoutable par sa complexité
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Jordan, lozano José. "Transmissions indirectes via l’environnement de pathogènes impliquées dans les gastroentérites aiguës de l’Homme à/autour de Bogotá (Colombie) Contamination of water, leafyvegetables and air by human enteric pathogens (GI and GII noroviruses, rotavirus type A, Salmonella spp., Shigella spp., Cryptosporidium spp.) in the suburb of Bogotá (Colombia) Mouse intestinal villi as a model system for studies of Norovirus infection." Thesis, Avignon, 2020. http://www.theses.fr/2020AVIG0359.

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Les gastroentérites aiguës affectent chaque année entre un quart et la moitié des personnes dans le Monde. Elles sont causes de morbidité, de mortalité et de coûts de santé importants. Leur transmission directe ou indirecte via l’eau, les aliments, l’air ou les surfaces inertes dépend de leur étiologie (virale, bactérienne ou parasitaire) et du contexte local. Bogotá et sa région présentent plusieurs spécificités : des eaux usées rejetées en rivière souvent sans ou après seulement un traitement primaire, la mise en décharge des papiers toilettes, couches et protections souillés par les excréme
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Chen, Tai-Lee, and 陳泰利. "Aperture-Coupling Excitation and Mode-Coupling Phenomena of Microstrip Leaky Modes." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/09419710206436045739.

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博士<br>國立交通大學<br>電子工程系<br>87<br>This thesis investigates the properties and applications of the first two higher order leaky modes of the microstrip, which include efficient feeding structures, mutual coupling on microstrips, coupling effect in different leaky modes, and several antenna applications. The spectral domain analysis is employed to solve the propagation characteristics of the microstrip leaky modes throughout this study. The first part of the thesis pertains to the first higher order leaky mode (odd mode) of the microstrip line. The design procedure of the microstrip f
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Kuen-Fwu, Fuh, and 傅坤福. "Full-Wave Analyses of Leaky Modes and Complex Modes on Planar Gyromagnetic Transmission Lines." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/43595936612774965888.

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博士<br>國立交通大學<br>電子研究所<br>83<br>The dyadic Green''s imprdance functions of gyromagnetic planar transmission lines are systemmatically established models. Full- wave numerical analyses are performed by appling the Galerkin''s method. After performing a series of numerical experiment, we conclude that the formation of the complex modes on the shielded gyromagnetic slotline is the result of coupling effects, caused by the presences of covers, among the leaky modes. A pair of dominant complex mo
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Hsu, Min-Cheng, and 徐敏政. "Analysis and measurement of leaky dominant modes on multiple coupled microstrips." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/56824936204648808353.

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碩士<br>國立交通大學<br>電信研究所<br>85<br>The leaky dominant modes on multiple coupled microstrips are investigated by the full-wave spectral domain approach (SDA) with appropriate deformation of integration contours to include the surface-wave poles. These modes exist independently of the customary bound dominant mode. They leak power away fromthe lines into the fundamental TM0 surface wave of the surrounding grounded substrate and may be responsible for spurious microstrip circuit performance
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Liu, Shih-Ping, and 劉士平. "Leaky Dominant Modes and Generalized Scattering Analyses of Layered Microwave Integrated Circuits." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/03457242046719760412.

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博士<br>國立交通大學<br>電信研究所<br>85<br>This thesis consists of two parts. The first part presents a novel electromagnetic simulation technique that incorporates a full-wave space-domain integral equation technique with a proposed excitation model based on the equivalence principle. The integral equation is solved numerically by Galerkin''s procedure resulting in the generalized scattering matrix (GSM) descriptions of the microwave circuit de-embedding. Rigorous convergence studies and extensive val
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Lin, Chung-I., and 林仲義. "Leaky-Bound Mode and Applications." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/57528474225546914955.

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碩士<br>國立清華大學<br>電子工程研究所<br>87<br>Discussed are the light transmission and their characteristics in a leaky step-index planar waveguide. In this waveguiding structure, an input guided mode will couple to continuous radiation modes, located in the leaky section. The major contribution of this thesis is to introduce a new concept - the leaky bound mode - to analyze the previous problem. The methodology is as follows. We are visionally incident a light ray from one side of the cladding to the leaky waveguide. If we can obtain extreme reflection, this condition corresponds to a new kind of bound mo
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Chou, Guang-Jong, and 周光中. "Active integrated leaky-mode antennas." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/42703454980186279477.

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博士<br>國立交通大學<br>電信工程研究所<br>84<br>A generic microstrip leaky-mode antenna is present. It consists of microstrip line on one side of substrate and uniplanar circuit on the other side. The leakage is producedby the excitation of the first higher-order (odd) microstrip mode coupledelectromagnetically through slotline on the opposite side of substrate. This feed designis uniplanar, which does not require via-holes and is easy to interface with active circuits. When the microstrip leaky-mode ant
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Lin, Yu-Cheng, and 林育正. "Self_Oscillating Active Leaky-Mode Antenna." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/51146018863585784307.

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碩士<br>國立交通大學<br>電信研究所<br>85<br>In this thesis, a HEMT-based differential amplifier integrated with a shortmicrostrip line is present for an self-oscillating active leaky-mode antenna.First, a differential feed short leaky-mode antenna with dual-beam radiationpattern is designed. This four-port element ( differential inputs and outputs)can be used in the active antenna as a radiating element. Secondly, weemploy a microstrip leaky-mode antenna and a feedback oscillator to design anoscillator
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Cheng, Guang-Fu, and 鄭光甫. "Design of Proximity-Coupled Microstrip Leaky Mode Array and Half-Width Microstrip Leaky Mode Antennas." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/37423827005750228082.

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博士<br>國立臺灣大學<br>電信工程學研究所<br>102<br>This dissertation presents a proximity-coupled microstrip EH1 mode array, a dual EH1 mode half-width microstrip antenna, and a differentially excited coupled half-width microstrip leaky EH1 mode antenna. In the design of the proximity-coupled microstrip EH1 mode array, the radiation characteristics of the EH1 mode microstrip line with a length shorter than one free space wavelength are investigated and designed as an array element. The matched radiating-element load is also proposed to provide the wider bandwidth of input impedance matching and the back lobe
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Cha, Guei-Yuan, and 鄭貴元. "Dual band Annular Ring Leaky-wave and Single-conductor High Order Mode Leaky-wave Antennas." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/fn2sum.

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碩士<br>國立交通大學<br>電信工程系所<br>92<br>In this thesis, we propose two kinds of antenna structure: microstrip first higher order mode and single conductor second higher order mode. Generally, leaky wave antennas have the advantages: high gain, high radiation efficiency, low cost. In microstrip leaky wave antenna, we use aperture coupling with slot exciting first higher order mode. Because we want to leak the energy at our leaky wave antenna, we must use longer length at our antenna. For reducing the size, we let our antenna become ring, we can the same effect with original antenna. The single conducto
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Sheng, Meng-Huei, and 盛夢徽. "Rigorous Leaky-Mode Analysis of Antiresonant Reflecting Optical Waveguides." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/84110131372336570151.

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博士<br>國立中山大學<br>光電工程研究所<br>93<br>We have developed a rigorous leaky-mode analysis on the antiresonant reflecting optical waveguides (ARROW’s) using a so-called “coupled electric (CE) coupled magnetic (CH) field method.” Radiation loss characteristics and the field distribution of the ARROW are analyzed in detail. Meanwhile, both the refractive indices and the thickness dependence for the isolation and distinction of modes are also investigated in this thesis. From the CE–CH method, the associated complex symmetric tridiagonal matrices are derived to solve the modal solutions via the eigenval
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陳炤祖. "New Radio Frequency Identification Approach Employing Leaky-Mode Array." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/33078351433062589311.

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碩士<br>國立交通大學<br>電信工程系<br>87<br>A battery-free radio frequency identification card which incorporates a dual-beam angle-diversity leaky-mode antenna is presented. The integrated antenna is operated at 11.9 GHz. and shows 20.4 dBi directivity, 16.3 dB gain, and 3-dB beamwidth of (Az/El) 23/24. By placing a horn antenna at 2.5 meters away for receiving the coded, modulated signals from the transponder, we obtain the demodulated signals matched identically to the coding signals at the transponder.
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YANG, CHUN-YU, and 楊純喻. "Development of leaky mode surface plasmon resonance based sensor." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/09566896834395272914.

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碩士<br>南臺科技大學<br>機械工程系<br>105<br>In this study, we improved the positioning mechanism of the semi-cylindrical prism for the surface plasmon resonance （SPR） based sensor to reduce the noises from the reflected signal as well as the diffused signal to the PIN light sensor. With the help of the graphical control panel written in the Microsoft Visual Basic language for controlling the microstep motor, the leaky mode signal of surface plasmon resonance along the interface between the gold film of 50 nm thickness and the semi-cylindrical prism could be measured through the positioning mechanism. In p
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Chuang, Ying-Chieh. "Full-Vectorial Finite Difference Mode Solver for Leaky Optical Waveguides." 2004. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2307200414220900.

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Chuang, Ying-Chieh, and 莊英傑. "Full-Vectorial Finite Difference Mode Solver for Leaky Optical Waveguides." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/71427437027268826890.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>92<br>Abstract Due to its simplicity and efficiency, a full-vectorial mode solver based on a finite difference scheme is applied to investigate the propagation characteristics of optical waveguides. Since uniform meshes are used in the numerical implementation, it is very easy to divide the computational window of any arbitrary cross-sectional geometries of the waveguides. An index averaging technique is employed to deal with curved dielectric interfaces for stabilizing the numerical calculation and accelerating convergence. In addition, for solving leaky-mode probl
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黃國峰. "Leaky Mode Propagation of Microstrip(s) with Finite Conductor Backing." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/05483546214305268758.

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碩士<br>國立交通大學<br>電信工程系<br>87<br>The finite ground plane effects on the first higher-order mode and the dominant mode of a microstrip is presented. Two special cases of the finite ground plane (the symmetric structure and the reverse structure) are discussed in this thesis. A new additional leaky mode is reported. We introduce the current distributions and the dispersion characteristics of this mode.
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