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Dissertations / Theses on the topic 'Microwave metamaterials'

Author: Grafiati

Published: 28 July 2024

Last updated: 31 July 2025

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1

Pengle, Jia. "Developing a Compact Microwave Filter Using Metamaterials." Thesis, Högskolan i Gävle, Avdelningen för elektronik, matematik och naturvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-13848.

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As communication services are growing, especially for keeping communication on high speed traffic, more efficient use of the available electromagnetic radio spectrum is required. In order to achieve this aim on communication spectrum, filters are required to be steeper. Metamaterials are a special kind of artificial structure that is not found in nature. The significant characteristic of metamaterials is the negative refractive index for operation frequency. Based on the specials structure of metamaterials and microwave theory, steeper filters can be obtained with low losses and relatively sma

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2

Butler, Celia A. M. "The microwave response of square mesh metamaterials." Thesis, University of Exeter, 2012. http://hdl.handle.net/10036/3596.

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Metamaterials are a class of artificial material, known to produce electromagnetic (EM) responses not found in nature due to their engineered subwavelength structure. In this thesis very thin subwavelength meshes are utilised to form layered metamaterials. The EM characteristics of the transmission and reflection response from these materials, including the polarisation converting behaviour, are explored to further understanding and develop structures to exploit and control the propagation of microwave radiation. Original experimental studies are presented across two sections; the first examin

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3

Прокопчук, Ольга Володимирівна, Ольга Владимировна Прокопчук, and Olha Volodymyrivna Prokopchuk. "Metamaterials and their application in microwave technology." Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/46853.

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Metamaterial is a composite material whose properties are not so much caused by the properties of its constituent elements as artificial periodic structure of macroscopic elements having arbitrary size and shape. Artificial periodic structure within the metamaterial modifies its dielectric and magnetic permeability, which allows to control the laws of dispersion, reflection and refraction electromagnetic waves in metamaterials.

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4

Dockrey, Joseph Anthony. "Manipulation of Microwave Surface Waves Supported on Metamaterials." Thesis, University of Exeter, 2015. http://hdl.handle.net/10871/18152.

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The primary focus of the work presented in this thesis is experimental investigations into microwave surface waves that are supported by various metamaterial geometries. If the patterning of the metamaterial is either resonant or periodic, surface waves that are somewhat analogous to surface-plasmon-polaritons at optical frequencies can be supported at microwave frequencies. The precise form of the texturing strongly influences the surface eigenmodes that can be supported. Two approaches to varying the surface-mode index, the ratio of the phase velocity of the surface wave to the speed of ligh

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5

Alburaikan, Abdullah. "Metamaterial structure inspired miniature RF/microwave filters." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/metamaterial-structure-inspired-miniature-rfmicrowave-filters(5e1dee93-038a-42ef-99ad-669ecc4b4763).html.

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Novel feedback signal interference concept for bandpass filter (BPF) design is proposed in this thesis. This new concept was utilized to design wide stopband BPF with superior performance for WLAN applications. The proposed filtering structure consists of two simple coupled-line couplers. The first coupler was employed within the main signal path and the second coupler which is open circuited at the opposite ends was used for the feedback circuit. This new filtering structure was fabricated using low temperature co-fired ceramic technology. The fabricated BPF exhibits an insertion loss (IL) of

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6

Tremain, Benjamin James. "The microwave response of metasurfaces." Thesis, University of Exeter, 2016. http://hdl.handle.net/10871/24304.

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The aim of this thesis is to investigate surface waves supported on a variety of metallic metasurfaces at microwave frequencies. The goal is to characterise the propagation of these surface waves in the plane of the structure and in some cases study how their presence gives rise to features in the scattering parameters of radiation incident on the metasurface.

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7

Schwanecke, Alexander Sven. "Novel phenomena in planar and layered, photonic and microwave metamaterials." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/340845/.

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This work is related to the investigation and development of novel concepts to utilise planar nanostructures in optics, aided by complementary research in the microwave domain—in particular: Strong polarisation conversion capabilities are shown for planar chiral nanoholes in the near-infrared part of the spectrum. The efficiency is found to depend strongly on the mutual orientation of the chiral hole and the polarisation of the incident light. Polarisation-dependent nano-focusing is seen for these nanoholes. Light is concentrated to a spot size of 42% of the wavelength in the proximity of a na

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8

Ekmekci, Evren. "Design, Fabrication And Characterization Of Novel Metamaterials In Microwave And Terahertz Regions: Multi-band, Frequency-tunable And Miniaturized Structures." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612730/index.pdf.

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This dissertation is focused on the design, fabrication, and characterization of novel metamaterials in microwave and terahertz regions with the following outcomes: A planar &micro<br>-negative metamaterial structure, called double-sided SRR (DSRR), is proposed in the first part of this study. DSRR combines the features of a conventional split ring resonator (SRR) and a broadside-coupled SRR (BC-SRR) to obtain much better miniaturization at microwave frequencies for a given physical cell size. In addition to DSRR, double-sided multiple SRR (DMSRR), double-sided spiral resonator (DSR), and dou

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9

Kafaratzis, Andreas. "Tunable and nonlinear RF/microwave circuits based on left-handed metamaterials." Thesis, University of Manchester, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.496239.

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A major drive in modem RF and microwave circuits design is miniaturisation and performance enhancement through new design and fabrication techniques. Left-handed (LH) metamaterials have sparked the interest of RF and microwave engineers due to their unique electromagnetic properties which not only can enhance circuit performance, but also significantly reduce circuit size. The work in this thesis focuses on the one-dimensional (1-D) circuit approach of LH. metamaterials termed LH transmission line (TL) in developing LH nonlinear and tunable circuits. Two important characteristics of LH TLs are

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10

Lai, Anthony. "One- and two-dimensional microwave devices based on left-handed metamaterials." Diss., Restricted to subscribing institutions, 2007. http://proquest.umi.com/pqdweb?did=1481670071&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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11

Berry, Simon James. "Microwave surface waves on metasurfaces with planar discontinuities." Thesis, University of Exeter, 2014. http://hdl.handle.net/10871/15283.

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The work presented within this thesis details the experimental investigation of the surface waves supported on metasurfaces. Particular attention has been given to the reflection of these surface waves from planar discontinuities associated with these metasurfaces. Various experimental techniques have been developed throughout this work to characterise surface wave supporting metasurfaces. These include a new technique for measuring the dispersion of surface waves supported on metasurfaces, characterisation of the near-field associated with the surface waves, a device for launching planar phas

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12

Selga, Ruiz Jordi. "Synthesis of Microwave Circuits Based on Metamaterials Using Aggressive Space Mapping Algorithms." Doctoral thesis, Universitat Autònoma de Barcelona, 2013. http://hdl.handle.net/10803/129505.

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En l'enginyeria de microones, alguns dels principals reptes són la reducció de la mida dels circuits i la flexibilitat de disseny. Aquests són aspectes clau dels dispositius de comunicacions i, com a resultat, s'han fet molts esforços en aquesta direcció. Un clar exemple són les anomenades línies de transmissió basades en metamaterials. Aquestes línies artificials presenten característiques controlables, són elèctricament petites i ofereixen noves funcionalitats. No obstant això, per la seva complexitat, les línies de transmissió metamaterial en general requereixen d’un procés de disseny feixu

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13

Palandöken, Merih [Verfasser], and Heino [Akademischer Betreuer] Henke. "Microwave Metamaterials for Compact Filters and Antennas / Merih Palandöken. Betreuer: Heino Henke." Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2012. http://d-nb.info/1028912854/34.

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Palandöken, Merih Verfasser], and Heino [Akademischer Betreuer] [Henke. "Microwave Metamaterials for Compact Filters and Antennas / Merih Palandöken. Betreuer: Heino Henke." Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2012. http://nbn-resolving.de/urn:nbn:de:kobv:83-opus-37561.

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Greinke, Berit. "Experimental fabrication and characterisation of textile metamaterial structures for microwave applications." Thesis, Queen Mary, University of London, 2017. http://qmro.qmul.ac.uk/xmlui/handle/123456789/24639.

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This thesis presents an investigation of fabrication technologies and electromagnetic characterisation of textile metamaterials in the microwave frequency range. Interdisciplinary in nature, the work bridges textile design practice and electromagnetic engineering. The particular ambition was to explore a number of surface techniques prevalent in the textile design field, and map their suitability for the construction of metatextiles for microwave operation. Two different classes of metatextiles, all-dielectric and dielectric with electrically conductive patterns, were examined. First, five str

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16

Gil, Barba Marta. "Resonant-type metamaterial transmission lines and their application to microwave device design." Doctoral thesis, Universitat Autònoma de Barcelona, 2009. http://hdl.handle.net/10803/5361.

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Recientes descubrimientos han hecho posible la creación de un nuevo tipo de materiales: los metamateriales. En sólo algunos años, el desarrollo de esta nueva rama científica ha dado lugar a numerosos descubrimientos y avances tecnológicos basados en las nuevas propiedades que exhiben estos nuevos materiales. Esta tesis recoge parte del trabajo desarrollado durante los últimos años por el grupo GEMMA y CIMITEC en la aplicación de líneas de transmisión de tipo resonante en el desarrollo de dispositivos de microondas. Su pequeño tamaño y la controlabilidad de sus propiedades eléctricas son las pr

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17

GARG, PRIYANKA. "DESIGN AND DEVELOPMENT OF METAMATERIAL BASED MICROWAVE COMPONENTS." Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2020. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18774.

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Planar technology has gained a lot of popularity since its inception due to various advantages it offered to the scientific world such as, light weight, compact size, ease of fabrication and integration, suitability of mass production and compatibility with planar solid state devices. However they also have certain drawbacks in terms of bandwidth, further miniaturization, gain, efficiency, etc. Metamataterials are introduced in the late 60s by a Russian physicist Victor Veselago [1], which were further investigated by Pendry et. al. [2] and are an active area of research these days. Met

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Kokkinos, Titos. "Analysis and design of metamaterial-inspired microwave structures and antenna applications." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/6094.

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Novel metamaterial and metamaterial-inspired structures and microwave/antenna applications thereof are proposed and studied in this thesis. Motivated by the challenge of extending the applicability of metamaterial structures into practical microwave solutions, the underlying objective of this thesis has been the design of low-cost, easily fabricated and deployable metamaterial-related devices and the development of computational tools for the analysis of those. For this purpose, metamaterials composed of tightly coupled resonators are chosen for the synthesis of artificial transmission lines a

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19

Patel, Neil Arakaki Dean Yasuo. "Theory, simulation, fabrication and testing of double negative and epsilon near zero metamaterials for microwave applications : a thesis /." [San Luis Obispo, Calif. : California Polytechnic State University], 2008. http://digitalcommons.calpoly.edu/theses/7/.

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Thesis (M.S.)--California Polytechnic State University, 2008.<br>"June 2008." "In partial fulfillment of the requirements for the degree [of] Master of Science in Electrical Engineering." "Presented to the faculty of California Polytechnic State University, San Luis Obispo." Major professor: Dean Arakaki, Ph.D. Includes bibliographical references (leaves 146-148). Also available online and on microfiche (2 sheets).

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Rinkevich, A. B., M. I. Samoylovich, and A. F. Belyanin. "Effective Conductivity and Magnetic Permeability of Nanostructured Materials in Magnetic Field." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35340.

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The problem of homogenization the nanostructured materials placed in DC magnetic field has been discussed. The experimental data are obtained using metallic superlattices, metal-dielectric thin films and 3D-nanostructured materials. All these materials contain ferro- or ferrimagnetic component. The trans-mission and reflection coefficients were measured on the waves of millimeter waveband. It has been shown that the experimental frequency spectra of the coefficients in zero magnetic field can be described by the effective conductivity and dielectric permittivity. The spectra of ferromagnetic r

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21

Wong, Man Fai. "A novel compact microstrip type composite right/left handed transmission line (CRLH TL) and its applications /." access full-text access abstract and table of contents, 2009. http://libweb.cityu.edu.hk/cgi-bin/ezdb/thesis.pl?mphil-ee-b23750467f.pdf.

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Thesis (M.Phil.)--City University of Hong Kong, 2009.<br>"Submitted to Department of Electronic Engineering in partial fulfillment of the requirements for the degree of Master of Philosophy." Includes bibliographical references.

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22

Decle, Colin Daniel. "Novel metamaterial structures for microwave component and circuit performance enhancements." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/novel-metamaterial-structures-for-microwave-component-and-circuit-performance-enhancements(c446a06c-7a46-4368-801c-76230eb0a104).html.

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In the thesis presented, three novel uni-planar left handed transmission lines based on Complementary Split Ring Resonators (CSRR) and Complementary Spiral Resonator (CSR) metamaterial particles are proposed for the first time and successfully applied for the performance enhancement of conventional coupled line filters and the design of a full scan leaky wave antenna. Based on the implementation of Complementary Split Ring Resonators (CSRR) a fully planar Composite Right left handed transmission line (CRLH-TL) plus a Dual Composite Right Left Handed transmission line (D-CRLH-TL) are proposed,

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23

Pasakawee, Sarinya. "Left-handed metamaterials realized by complementary split-ring resonators for RF and microwave circuit applications." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/lefthanded-metamaterials-realized-by-complementary-splitring-resonators-for-rf-and-microwave-circuit-applications(ee526cec-0c7a-4733-8534-7023c364f786).html.

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A new equivalent circuit of left-handed (LH) microstrip transmission line loaded with Complementary split-ring resonators (CSRRs) is presented. By adding the magnetic coupling into the equivalent circuit, the new equivalent circuit presents a more accurate cutoff frequency than the old one. The group delay of CSRRs applied with microstrip transmission line (TL) is also studied and analyzed into two cases which are passive CSRRs delay line and active CSRRs delay line. In the first case, the CSRRs TL is analyzed. The group delay can be varied and controlled via signal frequency which does not ha

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Durán-Sindreu, Viader Miguel. "Miniaturization of Planar Microwave Components Based on Semi-Lumped Elements and Artificial Transmission Lines: Application to Multi-Band Devices and Filters." Doctoral thesis, Universitat Autònoma de Barcelona, 2011. http://hdl.handle.net/10803/51004.

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La miniaturización de componentes de microondas es uno de los retos de los dispositivos de comunicación actuales y futuros. Por esta razón, esta tesis está orientada al estudio de nuevas estrategias de miniaturización de componentes planares de microondas no radiativos. A lo largo de este trabajo, se han aplicado diferentes técnicas de miniaturización para el diseño de diversos componentes de microondas como dispositivos multi-banda o filtros, incluyendo también implementaciones eléctricamente reconfigurables. Para obtener esta compactación de tamaño requerida y/o funcionalidad multi-ba

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25

Iwai, Akinori. "Linear and Nonlinear Functions of Plasmas in Electromagnetic Metamaterials." Kyoto University, 2019. http://hdl.handle.net/2433/242471.

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Yi, Jianjia. "Transformation optics : Application for antennas and microwave devices." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS027/document.

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Le concept de l'optique de transformation qui permet de contrôler le trajet des ondes électromagnétiques à volonté en appliquant une variation spatiale judicieusement définie dans les paramètres constitutifs, est exploré pour concevoir des nouveaux types d'antennes et de dispositifs micro-ondes. Dans une première partie, basée sur la transformation de coordonnées, un dispositif d'illusion capable de modifier l'apparence d'une émission électromagnétique et de la délocaliser, est validé par le biais de simulations numériques. Un dispositif de transition de guide d'ondes, permettant d'assurer une

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Patel, Neil. "Theory, Simulation, Fabrication and Testing of Double Negative and Epsilon Near Zero Metamaterials for Microwave Applications." DigitalCommons@CalPoly, 2008. https://digitalcommons.calpoly.edu/theses/7.

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Natural structures exhibiting simultaneous negative bulk permittivity and permeability have not yet been discovered. However, research interest over the past five years has grown with the proposition that artificial structures exhibiting these properties are realizable using specially-designed metallic inclusions embedded in host dielectric bodies. A periodic structure of metallic inclusions much smaller than the guided wavelength and embedded in a host dielectric medium is known in the physics and microwave communities as a "metamaterial". Such frequency-dependent effectively homogeneous mate

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Zong, Junyao. "Implementation of a Microstrip Square Planar N-Way Metamaterial Power Divider." Thesis, University of Canterbury. Electrical and Computer Engineering, 2008. http://hdl.handle.net/10092/1830.

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The work done in this thesis focuses on the design of a square-shaped 20-way metamaterial power divider which is fabricated in microstrip technology and operates at 1 GHz. The divider comprises 12 square-shaped left-handed unit cells and 13 square-shaped right-handed unit cells, and these unit cells have the same size and are placed in a checker-board tessellation, where the left-handed unit cells are connected only to right-handed unit cells and vice versa. The divider is based upon the infinite wavelength phenomenon in two-dimensions, and this means that the insertion phase between any two p

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Arigong, Bayaner. "Space and Spectrum Engineered High Frequency Components and Circuits." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc801923/.

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With the increasing demand on wireless and portable devices, the radio frequency front end blocks are required to feature properties such as wideband, high frequency, multiple operating frequencies, low cost and compact size. However, the current radio frequency system blocks are designed by combining several individual frequency band blocks into one functional block, which increase the cost and size of devices. To address these issues, it is important to develop novel approaches to further advance the current design methodologies in both space and spectrum domains. In recent years, the concep

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Vélez, Rasero Paris. "Circuitos diferenciales de microondas con rechazo del modo común basados en conceptos de metamateriales y en resonadores semidiscretos." Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/284140.

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El uso de dispositivos que operen con señales diferenciales y simultáneamente supriman el modo común cada vez atrae más la atención de los ingenieros de microondas. El contenido de esta tesis está enfocado en el estudio y diseño de circuitos balanceados de microondas utilizando técnicas avanzadas de diseño y conceptos derivados de los metamateriales así como el uso de resonadores semidiscretos. Mediante estos conceptos avanzados se han diseñado componentes de doble banda (dual) y filtros diferenciales de microondas con buen comportamiento y dimensiones reducidas. Para sintetizar estructuras d

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Muniz, Leone Veiga. "Projeto, fabricação e caracterização experimental de metamateriais quirais para biossensoriamento na faixa de micro-ondas." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/18/18155/tde-30092013-133437/.

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Este trabalho tem como objetivos projetar, construir e caracterizar experimentalmente metamateriais quirais bi-planares para faixa de micro-ondas com o objetivo de investigar a rotação de campo como transdutor em aplicações de biossensoriamento. As estruturas metamateriais estudadas foram primeiramente modeladas e caracterizadas com o uso de aplicativos computacionais comerciais baseadas no método dos elementos finitos, onde os parâmetros geométricos das estruturas foram definidos para operarem na faixa de 8GHz a 12GHz. A partir dos projetos das estruturas simuladas, os metamateriais foram con

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Aqeeli, Mohammed Ali M. "Microwave oscillator with phase noise reduction using nanoscale technology for wireless systems." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/microwave-oscillator-with-phase-noise-reduction-using-nanoscale-technology-for-wireless-systems(46287d2a-bc90-4cee-b893-ccf6a3b0747f).html.

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This thesis introduces, for the first time, a novel 4-bit, metal-oxide-metal (MOM) digital capacitor switching array (MOMDCSA) which has been implemented into a wideband CMOS voltage controlled oscillator (VCO) for 5 GHz WiMAX/WLAN applications. The proposed MOMDCSA is added both in series and parallel to nMOS varactors. For further gain linearity, a wider tuning range and minor phase noise variations, this varactor bank is connected in parallel to four nMOS varactor pairs, each of which is biased at a different voltage. Thus, VCO tuning gain reduces and optimal phase noise variation is obtain

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Culhaoglu, Ali Eren [Verfasser], Peter [Akademischer Betreuer] Russer, Wolfgang J. R. [Akademischer Betreuer] Hoefer, and Hans-Joachim [Akademischer Betreuer] Bungartz. "Microwave Metamaterials: Superlensing and Design of Low Reflection Coatings / Ali Eren Culhaoglu. Gutachter: Peter Russer ; Wolfgang J. R. Hoefer ; Hans-Joachim Bungartz. Betreuer: Peter Russer." München : Universitätsbibliothek der TU München, 2012. http://d-nb.info/1031512691/34.

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Culhaoglu, Ali Eren [Verfasser], Peter Akademischer Betreuer] Russer, Wolfgang J. R. [Akademischer Betreuer] Hoefer, and Hans-Joachim [Akademischer Betreuer] [Bungartz. "Microwave Metamaterials: Superlensing and Design of Low Reflection Coatings / Ali Eren Culhaoglu. Gutachter: Peter Russer ; Wolfgang J. R. Hoefer ; Hans-Joachim Bungartz. Betreuer: Peter Russer." München : Universitätsbibliothek der TU München, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:91-diss-20120724-1092907-0-5.

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Djekounyom, Eric. "Etude d'une structure métamatériau HIW coplanaire à substrat de ferrite : application à un isolateur hyperfréquence." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSES030.

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Les enjeux majeurs des dispositifs hyperfréquences utilisés dans les systèmes de télécommunication modernes sont la montée en fréquence de fonctionnement, la miniaturisation des circuits et l’intégrabilité des composants.Grâce à l’émergence des métamatériaux et à la maîtrise des propriétés des ferrites, il est possible de développer nouveaux dispositifs répondant à ces nouvelles exigences de l’électronique embarquée.Cette thèse développe, à partir d’une ligne métamatériau HIW coplanaire basée sur un substrat de ferrite, un nouveau dispositif hyperfréquence non réciproque de faible encombrement

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Zhou, Tao. "Etude de composants passifs hyperfréquences à base de métamatériaux et de ferrite." Phd thesis, INSA de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00782328.

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Ce travail de thèse, qui se rattache au domaine des composants télécom, concerne l'étude de composants passifs élémentaires constitués de lignes de transmission coplanaires alliant ferrite et métamatériaux. Ces composants sont susceptibles de réaliser de nouvelles fonctions en électronique des hautes fréquences en combinant plusieurs phénomènes comme ceux de non réciprocité, des comportements main droite - main gauche et l'agilité en fréquence. Les applications visées portent sur un grand champ de composants microondes comme des antennes, des isolateurs, déphaseurs, coupleurs, filtres - agiles

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McMahan, Michael T. "Metamaterial absorbers for microwave detection." Thesis, Monterey, California: Naval Postgraduate School, 2015. http://hdl.handle.net/10945/45904.

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Approved for public release; distribution is unlimited<br>The development of high-power microwave weapons and dependence on electronics in modern weapon systems presents a high-power microwave weapons threat in future military conflicts. This study experimentally determines the absorption characteristics of simple metamaterial devices to potentially be used as protection and identification mechanisms, constructed through standard printed circuit board manufacturing processes, in the microwave region. Experimental results and analysis techniques are presented confirming absorption peaks in the

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Buriak, I. A. "Microware applications of negative-refraction metamaterials." Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/46869.

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Metamaterials make a wide class of artificial composites, characterized by features that are hardly achievable technologically and unattainable in nature materials. These features, such as negative group velocity of EM wave and thus refraction index, are obtained due to simultaneously negative effective permittivity and permeability. The major classes of these composites are single negative materials (SNG), double negative materials (DNG), and electronic bandgap materials (EBG) or photonic crystals [1]. Permittivity and permeability depend on frequency, so there are RF MTMs (including

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Shahbazali, Maryam, and Wael Baki. "Influence of disorder on microwave left-handed metamaterial." Thesis, Högskolan i Gävle, Avdelningen för elektronik, matematik och naturvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-19099.

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Zhu, Jiwen. "Design and application of novel metamaterial elements and configurations." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:8410f555-3a06-49c7-8734-084f34cab129.

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Metamaterials are artificially constructed "materials" which are formed from arrays of engineered elements. By designing individual elements as well as their interactions, the propagation of electromagnetic (EM) waves within the structure can be manipulated, so that new responses can be realised which may not be found in nature. The subject of this research concerns the study of miniaturised elements with strong EM responses so that the constructed metamaterial can better approximate an ordinary low-loss material. The research involves designing miniaturised magnetic resonators operating in th

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Mavridou, Marina. "Tunable microwave and millimetre-wave metamaterial structures and applications." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/6263/.

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Novel designs of metamaterial structures as well as novel techniques and configurations for tuning metamaterials are presented in this PhD thesis. The proposed tuning techniques overcome the challenges that exist in other tuning techniques available thus far. Moreover, possible applications of tunable metamaterials in communication systems are proposed. Initially, tunable Electromagnetic Band-Gap (EBG) structures are proposed for low frequencies operation (3GHz to 6GHz) employing a novel biasing technique for varactor diodes. Subsequently, the proposed tunable EBG structures are applied to clo

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Klotz, Geoffroy. "Revêtements d’optique de transformation en hyperfréquences." Thesis, Aix-Marseille, 2020. http://www.theses.fr/2020AIXM0126.

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Ce travail de thèse porte sur l'optique transformationnelle et ses applications. Les capes et tapis d'invisibilité, ainsi que les revêtements mimétiques sont étudiés au travers de simulations dans les hyperfréquences à l'aide du logiciel COMSOL Multiphysics. Ces simulations permettent de comprendre les phénomènes en jeu et d'appréhender les difficultés de réalisation expérimentale. Nous abordons divers systèmes et discutons de leurs performances ainsi que de leur faisabilité. La réalisation de revêtements d'optique transformationnelle (OT) est un challenge important, pour lequel nous proposons

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Genc, Alper. "Metamaterial-Inspired Miniaturized Multi-Band Microwave Filters and Power Dividers." DigitalCommons@USU, 2010. https://digitalcommons.usu.edu/etd/700.

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Integration of more communication standards in one microwave wireless device created a demand on developing compact, low-cost, and robust multi-band microwave components. This dissertation presents three studies for designing miniaturized and multi-band circuits that can be used for multi-band radio frequency (RF) front-ends. These three studies are the design of dual-band and tunable bandpass filters as well as dual- and triple-band equal-split power dividers/combiners. The dual-band filter is based on split ring resonators and double slit complemantary split ring resonators. A dual-band prot

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Lu, Xueying Ph D. Massachusetts Institute of Technology. "Metamaterial structures for Wakefield acceleration and high power microwave generation." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/123347.

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This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2019<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 209-218).<br>This thesis presents the theoretical and experimental investigation of the interaction of metamaterial structures with electron beams for two applications: wakefield acceleration and high power microwave generation. Under the topic of wakefield accel

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Uddin, Md Jasim. "Synthesis and analysis of metamaterial structure for microwave frequency applications." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/107850/1/Md.%20Jasim_Uddin_Thesis.pdf.

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This thesis involves analysis of artificial materials to investigate metamaterial behavior and characteristics. Extraction techniques are used to validate the electromagnetic properties and different microwave applications are investigated. A new geometric structure is designed using dual star split ring resonator, which introduces a sharp, wide rejection band. A metamaterial microwave absorber suitable for dual-band operation and insensitive to incident polarization was also developed.

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Bonache, Albacete Jordi. "Filtros de microondas basados en metamateriales y en resonadores concentrados." Doctoral thesis, Universitat Autònoma de Barcelona, 2007. http://hdl.handle.net/10803/5355.

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Recientemente se ha abierto un nuevo campo de investigación en el área del electromagnetismo aplicado y de la ingeniería de microondas basado en el control de las propiedades electromagnéticas de ciertas estructuras periódicas artificiales conocidas como metamateriales. Debido a que las celdas constitutivas de este tipo de estructuras presentan unas dimensiones muy reducidas en términos de longitud de onda es posible diseñar, en base a este concepto, dispositivos que combinen un gran nivel de compactación y elevadas prestaciones. En esta tesis se han utilizado las propiedades de dichos medios

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Zhou, Rongguo. "Investigation of Microwave Antennas with Improved Performances." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/195310.

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This dissertation presents the investigation of antennas with improved performances at microwave frequencies. It covers the following three topics: the study of the metamaterial with near-zero index of refraction and its application in directive antenna design, the design technique of a wideband circularly polarized patch antenna for 60GHz wireless application and the investigation of a novel direction of arrival (DOA) estimation technique inspired by human auditory system. First, the metamaterial composed of two-dimensional (2-D) metallic wire arrays is investigated as an effective medium wit

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SAXENA, GAURAV. "DESIGN AND ANALYSIS OF MICROWAVE COMPONENTS FOR MIMO COMMUNICATION SYSTEM." Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2020. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18776.

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Wireless communication demands better channel capacity with a high data rate in the modern era. To fulfill these demands, the MIMO-communication systems are developed that use manifold antennas for transmitter and receiver end. MIMO is a state-of-art technology that improves the reliability of the communication systems by utilizing the diversity technique to mitigate the multi-path fading issues, where signals may come together belligerently at the receiver. Improve spectral efficiency is achieved by the total transmitted power spreading over the antennas. Thus, MIMO can increase channel capac

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Hummelt, Jason Samuel. "High power microwave generation using an active metamaterial powered by an electron beam." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/106771.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, 2016.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 205-210).<br>This thesis presents the theory, design, and experimental demonstration of coherent microwave generation at 2.4 GHz in a metamaterial loaded waveguide using a 490 keV, 84 A, one microsecond pulse length electron beam that produced more than 5 MW of microwave power. Three different metamaterial structure designs named MTM1, MTM2, and MTM3 were tested with design frequencies of 2.8, 2.4, and

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Rodríguez, Pérez Ana María. "Synthesis of Planar Microwave Circuits based on Metamaterial Concepts through Aggressive Space Mapping." Doctoral thesis, Universitat Politècnica de València, 2015. http://hdl.handle.net/10251/48465.

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RF and microwave applications represent one of the fastest-growing segments of the high performance electronics market, where ongoing innovation is critical. Manufacturers compete intensively to meet market needs with reduced cost, size, weight and many other performance criteria demands. Under this scenario, transmission lines based on metamaterial concepts can be considered a very interesting alternative to the conventional transmission lines. They are more compact (compatible with planar manufacturing processes) and present higher degrees of design flexibility. Furthermore, metamater

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