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Rozprawy doktorskie na temat „Electromagnetic Periodic Structures”

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Data publikacji: 6 września 2023

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Sprawdź 31 najlepszych rozpraw doktorskich naukowych na temat „Electromagnetic Periodic Structures”.

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1

Refig, Andre. "Computational electromagnetic analysis of periodic structures." Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520979.

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Morozov, Gregory V. "Plane electromagnetic waves in layered periodic dielectric structures." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ62329.pdf.

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Sudhakaran, Sunil. "Negative refraction from electromagnetic periodic structures and its applications." Thesis, Queen Mary, University of London, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430074.

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Mias, Christos Georgiou. "Finite element modelling of the electromagnetic behaviour of spatially periodic structures." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361740.

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Maier, Stefan [Verfasser]. "Guiding of electromagnetic energy in subwavelength periodic metal structures / Stefan Maier." Hamburg : Diplom.de, 2003. http://d-nb.info/1184908478/34.

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6

Lindberg, Martin. "Mode Matching Analysis of One-Dimensional Periodic Structures." Thesis, KTH, Elektroteknisk teori och konstruktion, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231842.

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In this thesis, we analyze the electromagnetic wave propagation in waveguidestructuresexhibiting periodical geometry, including glide symmetry. The analysisis performed using a mode matching technique which correlates the different modecoefficients from separate but, connected regions in the structure. This technique isused to obtain the dispersion diagrams for two one-dimensional periodic structures:a glide-symmetric corrugated metasurface and a coaxial line loaded with periodicholes. The mode matching formulation is presented in Cartesian and cylindricalcoordinate system for the former and t
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7

Gudu, Tamer. "Analysis And Design Of Microstrip Printed Structures On Electromagnetic Bandgap Substrates." Phd thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609417/index.pdf.

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In the first part of the thesis, the 2-D structures in stratified media are analyzed using an efficient MoM technique. The method is used to optimize transmitted or reflected electric fields from the 2-D structures. The genetic algorithm is used in the optimization process. In the second part a 3-D MoM technique is implemented to analyze multilayered structures with periodically implanted material blocks. Using the method, the dispersion and reflection characteristics of the structure are calculated for different configurations. The results are compared with the results found in the literature
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Forslund, Ola. "Scattering and propagation of electromagnetic waves in planar and curved periodic structures - applications to plane wave filters, plane wave absorbers and impedance surfaces." Doctoral thesis, KTH, Alfvén Laboratory, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3825.

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<p>The subject of this thesis is scattering of electromagneticwaves from planar and curved periodic structures. The problemspresented are solved in the frequency domain.</p><p>Scattering from planar structures with two-dimensionalperiodic dependence of constitutive parameters is treated. Theconstitutive parameters are assumed to vary continuously orstepwise in a cross section of a periodically repeating cell.The variation along a longitudinal coordinate z is arbitrary. Ageneral skew lattice is assumed. In the numerical examples, lowloss and high loss dielectric materials are considered. Thepro
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9

Vouvakis, Marinos N. "A Non-Conformal Domain Decomposition Method for Solving Large Electromagnetic Wave Problems." The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1125498071.

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10

Polat, Ozgur Murat. "Ray Anlaysis Of Electromagnetic Scattering From Semi-infinite Array Of Dipoles In Free Space." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12608347/index.pdf.

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Electromagnetic wave scattering from a semi-infinite array of dipoles in free space is described by using asymptotic high frequency methods. An electric field integral expression is obtained and solved with asymptotic high frequency methods. An asymptotic field expression is obtained for a finite &times<br>infinite array of dipoles in free space. The analytical closed form expression for the array guided surface wave launching coefficient is obtained via a combination of an asymptotic high frequency analysis of a related reciprocal problem and Lorentz reciprocity integral formulation for the s
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11

Kovács, Peter. "Návrh a optimalizace struktur s elektromagnetickým zádržným pásmem." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-233538.

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Dizertační práce pojednává o návrhu a optimalizaci periodických struktur s elektromagnetickým zádržným pásmem (EBG – electromagnetic band gap) pro potlačení povrchových vln šířících se na elektricky tlustých dielektrických substrátech. Nepředvídatelné chování elektromagnetických vlastností těchto struktur v závislosti na parametrech elementární buňky činí jejích syntézi značně komplikovanou. Bez patřičného postupu je návrh EBG struktur metodou pokusu a omylu. V první části práce jsou shrnuty základní poznatky o šíření elektromagnetických vln v tzv. metamateriálech. Následně je diskutován správ
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12

Casselbrant, Gustav. "Domain Decomposition Methods for Finite Periodic Structures in Electromagnetics." Thesis, KTH, Elektroteknisk teori och konstruktion, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-99198.

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Long computational times persist on being a limiting factor when designing complex electromagnetic structures. Even though computers get more and more powerful, the most efficient improvement for reducing the necessary time when solving a numerical problem is to change or optimise the used numerical method. One numerical method introduced lately is the domain decomposition method (DDM). This thesis explores the available algorithms for computational electromagnetics which are based on DDM. The study is concentrated on algorithms available for computational electromagnetics. The aim of the stud
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13

Kambisseri, Roby Neelu. "Wireless communication using metasurfaces for condition monitoring in motor." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-246051.

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Wireless sensors are used widely for condition monitoring in electric machines. The metal enclosure of an electric motor restricts the signal from sensors to radiate outside. The signal from the metal cavity needs to be guided to the only opening in the enclosure, through a narrow gap between the stator and the rotating rotor. Gap waveguide technology is proposed as a solution by texturing the stator surface with electromagnetic band gap (EBG) structures. Arrays of periodic holey structures are used to realize the metasurface waveguide. Two Bravais lattice structures – square and hexagonal, ar
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14

Wang, Feng. "Development of A Fast Converging Hybrid Method for Analyzing Three-Dimensional Doubly Periodic Structures." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1376923791.

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15

Liu, Zicheng. "Electromagnetic modeling and imaging of damages of fiber-reinforced composite laminates." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS332.

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Mon travail de thèse porte sur la modélisation électromagnétique et l'imagerie de structures périodiques désorganisées. Un certain motif dans une subdivision élémentaire (une "cellule") est répété dans les autres cellules de la structure dans certaines directions de l'espace. Cette répétition est désorganisée par un changement des propriétés des matériaux et/ou géométries des parties constitutives, dans une ou plusieurs cellules. Au premier niveau de modélisation, ces panneaux sont une succession de plaques planes l'une sur l'autre. Chacun se compose d'un agencement linéaire régulier de longs
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16

Li, Changyou. "Electromagnetic modeling and simulation of fiber-reinforced periodically-structured planar laminates." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112219/document.

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La thèse porte sur la modélisation électromagnétique et la simulation de composites stratifiés plans (laminés), renforcés par des fibres organisées périodiquement. L'objectif est d'acquérir une bonne compréhension du comportement électromagnétique de telles structures, en première et étape de ce que pourrait ultérieurement être la production d’images mettant en évidence la localisation de zones éventuellement endommagées, et fournissant une certaine quantification de celles-ci. La thèse proprement dite se concentre donc sur la construction et l’évaluation de modèles de la diffraction électroma
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17

Kula, Jeffrey Scott. "Reconfigurable Band Rejection Frequency Selective Structures." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1545336272765337.

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18

Silva, Maurício Weber Benjó da 1980. "Superfícies seletivas em frequência - FSS : concepção e projeto de absorvedores planares de micro-ondas para aplicação em WLAN, WIMAX e radar." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261243.

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Orientador: Luiz Carlos Kretly<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação<br>Made available in DSpace on 2018-08-24T13:36:57Z (GMT). No. of bitstreams: 1 Silva_MauricioWeberBenjoda_D.pdf: 10953654 bytes, checksum: 6b4d1b6000f187a807b5cec8ba653713 (MD5) Previous issue date: 2014<br>Resumo: Neste trabalho, as diferentes propriedades de superfícies seletivas em frequência, FSS - Frequency Selective Surfaces, são analisadas. As FSS são estruturas planares com células periódicas e podem ser classificadas como uma classe de metamateria
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19

Nešpor, Dušan. "Numerické modelování periodických struktur." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-233641.

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The thesis discusses the dynamic electromagnetic field on periodic structures. The author focuses on three principal types of resonant structures, considering their application possibilities. In general, these types can be individually defined as follows: materials exhibiting a negative refractive index of the incident electromagnetic wave; structures with gradual changes in impedance, characterised by their usability as reflectionless surfaces; and periodic structures able to conveniently shape the magnetic field distribution. Materials of the third group within the above-shown short list fac
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20

Maalik, Abdul. "Novel Characteristic-Mode-Based Synthesis and Analysis Method for Reflectarray Antennas." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1593684814222685.

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21

Ren, Kai. "Physics-Based Near-Field Microwave Imaging Algorithms for Dense Layered Media." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1511273574098455.

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22

Barros, Fabien de. "Conception, Réalisation et Caractérisation de papiers fonctionnels pour des applications de filtrage électromagnétique." Thesis, Grenoble, 2011. http://www.theses.fr/2011GRENT118/document.

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Le brouillard électromagnétique dans lequel nous vivons en permanence estaujourd’hui montré du doigt car, outre les risques sanitaires qu’il pourrait engendrer, illimite l’usage de certaines technologies. L’importance des interférences entre réseauxsans fil, ou la peur du piratage sur ces mêmes réseaux, en sont deux exemples. Cetravail de thèse vise à développer un nouveau moyen de protection contre certaines deces ondes électromagnétiques. Plus spécifiquement, ce travail se focalise sur unetechnologie capable de filtrer uniquement les ondes WiFi et GSM à travers de grandessurfaces d’une habit
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23

Maier, Stefan Alexander. "Guiding of Electromagnetic Energy in Subwavelength Periodic Metal Structures." Thesis, 2003. https://thesis.library.caltech.edu/515/1/thesis.pdf.

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<p>The ultimate miniaturization of optical devices requires structures that guide electromagnetic energy with a lateral confinement below the diffraction limit of light. In this thesis, the possibility of employing plasmon-polariton excitations in plasmon waveguides consisting of closely spaced metal nanoclusters for this purpose is examined. The feasibility of energy transport with mode sizes below the diffraction limit of visible light over distances of several hundred nanometers is demonstrated.</p> <p>As a macroscopic analogue to plasmon waveguides, the transport of electromagnetic ener
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24

Chen, Po-Chun, and 陳柏均. "Routing Noise Suppression Using Novel Non-Periodic Electromagnetic Bandgap Structures." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/14276718625664500020.

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碩士<br>國立臺灣大學<br>電信工程學研究所<br>105<br>This thesis focuses on the problem of Electromagnetic Interference (EMI) of Printed Circuit Board (PCB) routing noise. It first considered Defected Ground Structure (DGS) to suppress noise for EMI improvement, but found it causing another EMI problem. Hence, a novel non-periodic Electromagnetic-Bandgap (EBG) structure is proposed in this thesis. By combining non-periodic EBG and de-coupling capacitors, the propagation characteristics are investigated and an design rule is proposed. The full-wave EM simulation, ADS and GTEM cell measurement are used to validat
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25

Liu, Xing-Xiang. "Generalized homogenization theory and inverse design of periodic electromagnetic metamaterials." Thesis, 2013. http://hdl.handle.net/2152/25165.

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Artificial metamaterials composed of specifically designed subwavelength unit cells can support an exotic material response and present a promising future for various microwave, terahertz and optical applications. Metamaterials essentially provide the concept to microscopically manipulate light through their subwavelength inclusions, and the overall structure can be macroscopically treated as homogeneous bulk material characterized by a simple set of constitutive parameters, such as permittivity and permeability. In this dissertation, we present a complete homogenization theory applicable to o
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26

Chen, Yu-Tang, and 陳于堂. "Study on Filtering Effects and Effective Electromagnetic Parameters of Subwavelength Periodic Structures." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/70981359555807622833.

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博士<br>國立臺灣大學<br>光電工程學研究所<br>99<br>Subwavelength periodic structures provide two attractive capabilities: controllable filtering effects and synthesis of effective parameters supporting extraordinary physical properties not seen usually in nature; therefore they have been the subject of tremendous research in recent years. The variety of features in subwavelength arrays, such as extraordinary transmission, reflection, and absorption, polarization steering, and nonlinear effects are attributed to resonances. Besides intrinsic material resonances from light-matter interactions, geometrical confi
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27

Maldovan, Martin. "Methods for Calculating the Optical Band Structure of Photonic Composites." 2002. http://hdl.handle.net/1721.1/3981.

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Lately, there has been an increasing interest in studying the propagation of electromagnetic waves in periodic dielectric structures (photonic crystals). Like the electron propagation in semiconductors, these structures are represented by band diagrams in which gaps can be found where the electromagnetic propagation is forbidden. Much effort is dedicated to find structures that can prohibit the propagation of light in all directions. This effect could lead to light localization.<br>Singapore-MIT Alliance (SMA)
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28

PENG, CHIA-KAI, and 彭佳凱. "The study on Electromagnetic Energy Gap and Periodic Structure." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/2ze254.

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碩士<br>明新科技大學<br>電機工程系碩士在職專班<br>105<br>In view of the advantages of the common plane waveguide and the periodic structure circuit, the square ground surface defect structure 2001 is also proposed, the so-called ground plane defect structure is only in the microstrip line or co-planar waveguide on the ground surface etching and digging holes to produce defective structure In the past, the literature only discusses how to apply the periodic planar defect structure to the CoplanarStrip-Line, the coplanar waveguide and the Slot-Line transmission line to realize the resonator and the filter. Some to
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29

Chiou, Yi-Chyun, and 邱逸群. "Improved Doubly Electromagnetic Periodic Structure (DEPS) for Microwave Power Amplifier Applications." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/63135545005565167289.

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碩士<br>逢甲大學<br>電子工程所<br>91<br>In this thesis, the 1-W power amplifier module is designed and implemented. Measured results of this circuit are also presented. The power amplifier module that has 30 dB gain and 1-W output power is two stages. It is very suitable to utilize this power amplifier module for some important communication specifications such as WCDMA, Bluetooth, WLAN, and so on. Next, we proposed a doubly electromagnetic periodic structure (DEPS) bandstop filter which implements EPS cells both in the signal strip and the ground plane. A good agreement between simulations and measure
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30

Li, Dongying. "Efficient Time-domain Modeling of Periodic-structure-related Microwave and Optical Geometries." Thesis, 2011. http://hdl.handle.net/1807/27588.

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A set of tools are proposed for the efficient modeling of several classes of problems related to periodic structures in microwave and optical regimes with Finite-Difference Time-Domain method. The first category of problems under study is the interaction of non-periodic sources and printed elements with infinitely periodic structures. Such problems would typically require a time-consuming simulation of a finite number of unit cells of the periodic structures, chosen to be large enough to achieve convergence. To alleviate computational cost, the sine-cosine method for the Finite-Difference Time
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Emiroglu, Caglar D. "Transmission-Line Metamaterial Design of an Embedded Line Source in a Ground Recess." 2011. https://scholarworks.umass.edu/theses/606.

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A transmission-line metamaterial design of a material-embedded electric line source radiating inside a ground recess is investigated. The media embedding the recessed line source are designed such that the embedded current creates the same radiation pattern as a line source over a flat conducting ground plane. Transmission-line metamaterial unit cell designs for the embedding media obtained from the transformation electromagnetics design technique are shown. The metamaterial design of the overall embedded source configuration is numerically tested using circuit simulations. It is shown that th
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