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Dissertations / Theses on the topic 'Near field magnetic enhancement'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

Beneš, Adam. "Plazmonické antény pro vysoké vlnové délky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443226.

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Tato diplomová práce se zabývá vlastnostmi plazmonických antén v oblasti vysokých vlnových délek. Důraz je kladen na popis rezonančních vlastností jednotlivých antén i antén uspořádaných do periodických polí. Těžiště práce spočívá v počítačovém modelování navýšení magnetického pole v blízkosti antén, které lze využít ve vysokofrekvenční elektronové paramagnetické rezonanci (HFEPR) k zesílení měřeného signálu. Autor se zabývá kvantifikací zesílení v anténách s odlišnou geometrií a navrhuje i geometrii vlastní. Značná část práce se také věnuje snaze rozlišit příspěvky k navýšení magnetického pol

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2

Sulaiman, Ali Haidar. "The near-Saturn magnetic field environment." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/44209.

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Shock waves exist throughout the universe and are fundamental to understanding the nature of collisionless plasmas. The complex coupling between charged particles and electromagnetic fields in plasmas give rise to a whole host of mechanisms for dissipation and heating across shock waves, particularly at high Mach numbers. While ongoing studies have investigated these process extensively both theoretically and via simulations, their observations remain few and far between. This thesis presents a study of very high Mach number shocks in a parameter space that has been poorly explored and identif

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3

Seguin, Guy. "Enhancement of efficiency and accuracy of near-field measurements." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0018/NQ44576.pdf.

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4

Séguin, Guy. "Enhancement of efficiency and accuracy of near-field measurements." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=35612.

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This thesis examines the possibility of increasing the speed of Near-Field measurement of an Antenna, by reducing the number of measurement points and by determining the degree of truncation permissible while maintaining a prescribed degree of precision of the reconstructed far-field.<br>The mathematical formulation leading to the near-field to far-field transform is presented in a novel and simpler form to use. Relations are established between the selected area and sampling rate of Near-Field measurement and the accuracy of the Far-Field of an Antenna. The spectral domain of the field is ana

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5

Fischer, Janina [Verfasser]. "Near-field mediated enhancement effects on plasmonic nanostructures / Janina Fischer." Mainz : Universitätsbibliothek Mainz, 2012. http://d-nb.info/1019193654/34.

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6

Hearn, Christian Windsor. "Electrically-Small Antenna Performance Enhancement for Near-Field Detuning Environments." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/49554.

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Bandwidth enhancement of low-profile omnidirectional, electrically-small antennas has evolved from the design and construction of AM transmitter towers eighty years ago to current market demand for battery-powered personal communication devices. Electrically-small antenna theory developed with well-known approximations for characterizing radiation properties of antenna structures that are fractions of the radiansphere. Current state-of-the-art wideband small antennas near kaH1 have achieved multiple-octave impedance bandwidths when utilizing volume-efficient designs. <br />Significant advances

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7

Went, Daniel Robert. "Magnetic field and plasma in Saturn's near space environment." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/9066.

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This thesis concerns spacecraft observations of magnetic field and plasma in Saturn’s near space environment and compares these observations with those made in and near the Jovian magnetosphere. Such comparisons are equivalent to ‘turning the experimental dial’ in planetary magnetospheres and provide a valuable insight into the way different parameters govern the structure and dynamics of magnetospheres throughout the solar system. Saturn and its magnetosphere is currently being studied by the Cassini spacecraft which, arriving at Saturn in the summer of 2004, became the first spacecraft ever

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8

Arkeholt, Simon. "Induction in Printed Circuit Boards using Magnetic Near-Field Transmissions." Thesis, Linköpings universitet, Teoretisk Fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-148788.

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In 1865 Maxwell outlined the theoretical framework for electromagnetic field propagation. Since then many important developments have been made in the field, with an emphasis on systems using high frequencies for long-range interactions. It was not until recent years that applications based on short-range inductive coupling demonstrated the advantages of using low frequency transmissions with magnetic fields to transfer power and information. This thesis investigates magnetic transmissions in the near-field and the possibility of producing induced voltages in printed circuit boards. A near-fie

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9

Bocan, Jiri. "Sensitivity enhancement and field-dependent relaxation in singlet nuclear magnetic resonance." Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/354550/.

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Nitrous oxide (N2O), also known as "laughing" gas, is a well known compound used in medicine as a mild anaesthetic, or in engineering as a powerful oxidizer providing highoutput of engines. Recently, its 15N doubly-labelled isotopologue attracted attention in singlet NMR due to its long singlet relaxation time ranging between 7 minutes, when dissolved in blood, up to 26 minutes in degassed dimethyl sulfoxide (DMSO). Singlet NMR deals with nuclear singlet states, which are exchange antisymmetric quantum states of coupled pairs of spin-1/2 nuclei with zero total nuclear spin quantum number. Thes

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10

Shu, Qingying. "Statistical modelling of the near-Earth magnetic field in space weather." Thesis, University of Glasgow, 2018. http://theses.gla.ac.uk/8937/.

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Space weather refers to electromagnetic disturbances in the near-Earth environment as a result of the Sun-Earth interaction. Severe space weather events such as magnetic storms can cause disruption to a wide range of technologies and infrastructure, including communications systems, electronic circuits and power grids. Because of its high potential impact, space weather has been included in the UK National Risk Register since 2011. Space weather monitoring and early magnetic storm detection can be used to mitigate risk in sensitive technological systems. The aim of this project is to investiga

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11

Brown, Wayne. "Characterisation of low energy ions observed near and during the substorm expansion phase onset." Thesis, University of Warwick, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302621.

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12

He, Weiping. "Characterizing near-field circuit board radiation using crossed electric and magnetic dipole sources." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2010. http://scholarsmine.mst.edu/thesis/pdf/He_09007dcc807256ca.pdf.

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Thesis (M.S.)--Missouri University of Science and Technology, 2010.<br>Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed Dec. 23, 2009). Includes bibliographical references (p. 60).

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13

Gottula, Ronald Brett. "Discrete-Time Implementation, Antenna Design, and MIMO for Near-Field Magnetic Induction Communications." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3324.

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Near-field magnetic induction (NFMI) is a short range wireless technology that uses loop antennas coupled by a magnetic field. NFMI antennas are electrically small and thus extremely inefficient and narrow band, making system design for multi-user and high-bitrate applications challenging. The goals of this thesis are to develop a test platform suitable for NFMI antenna testing, to model, design and test NFMI antennas that have high bandwidth-efficiency, and to explore the possibility of using MIMO (multiple-input multiple-output) to increase the capacity of the NFMI channel. This thesis provi

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14

Williams, Devin Wells. "Optimization of Near Field Coupling for Efficient Power Transfer Utilizing Multiple Coupling Structures." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/32933.

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A rise in the need for dynamic energy allocation has been associated with the saturation of available portable wireless electronic devices. Currently, the methods for transmitting this energy efficiently have been limited to a number of options, including near field resonant magnetic coupling. Previous research with mid-range (dâ 4r) wireless power transfer has resulted in coupling efficiencies of close to 40%. In order to increase efficiency in transfer a more directive transmission system was developed using a phased array. Coupling networks were used to shift the resonance of the coupl

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15

Bechtel, Kyle A. "MAGNETIC RESONANCE IN THE PROXIMITY OF AN INSTABILITY: PERPENDICULAR RESONANCE IN PERMALLOY NEAR THE CRITICAL FIELD." Oxford, Ohio : Miami University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1250281122.

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16

Eichel, Rüdiger-Albert. "New concepts in two-dimensional pulse electron paramagnetic resonance spectroscopy : resolution enhancement by magnetic field modulation /." Zürich : [s.n.], 2001. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=14394.

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17

Réal, Denis. "Theutilization of near-field techniques to enhance electro-magnetic side channel cryptanalysis : new attacks and countermeasures." Rennes, INSA, 2010. http://www.theses.fr/2010ISAR0005.

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Un composant cryptographique ne se comporte pas comme coffre-fort : son activité interne échange via des média accessibles avec son environnement proche et lointain. Ainsi, l’écoute du rayonnement électromagnétique est une réelle menace. Combiner des informations indirectes à la cryptanalyse logique permet en effet d’accéder à des informations confidentielles. Cette vulnérabilité devient inquiétante, la cryptographie ayant envahi notre quotidien tout numérique. Le travail de notre thèse porte donc sur la mesure en champ proche du rayonnement produit par les composants électroniques. Plus préci

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18

Aizawa, Hirohito, Kazuhiko Kuroki, and Yukio Tanaka. "Strong magnetic field enhancement of spin triplet pairing arising from coexisting 2k_F spin and 2k_F charge fluctuations." American Physical Society, 2008. http://hdl.handle.net/2237/11284.

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19

Sivaraman, Nimisha. "Design of magnetic probes for near field measurements and the development of algorithms for the prediction of EMC." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAT082/document.

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Au fur et à mesure que le nombre de composants augmente, il existe une forte demande pour identifier les sources de rayonnement pour la prédiction de la compatibilité électromagnétique des circuits électroniques. Le balayage d’une sonde à proximité du circuit est une méthode générale d'identification des sources rayonnantes dans une PCB. La première partie de la thèse consiste à concevoir et à caractériser des sondes magnétiques à haute sensibilité et à haute résolution spatiale. Les sondes conventionnelles basées sur la ligne micro ruban et la configuration coplanaire sont étudiées. À mesure

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20

Eftekhar, Ali Asghar. "Nanoscale light-matter interactions in the near-field of high-Q microresonators." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/45900.

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The light-matter interaction in the near-field of high-Q resonators in SOI and SiN platforms is studied. The interactions of high-Q traveling-wave resonators with both resonant and non-resonant nanoparticles are studied and different applications based on this enhanced interactions in near-field such as high-resolution imaging of mode profile of high-Q resonators, label-free sensing, optical trapping, and SERS sensing are investigated. A near-field imaging system for the investigation of the near-field phenomena in the near-field of high-Q resonators is realized. A new technique for high-resol

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21

Moore, Darren C. "Speech enhancement using microphone arrays." Thesis, Queensland University of Technology, 2000. https://eprints.qut.edu.au/36141/1/36141_Moore_2000.pdf.

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This thesis presents a comparative analysis of baseline microphone array speech enhancement techniques that are prominent in current literature. Delay-sum beamforming, sub-array beamforming, near- and far-field superdirectivity, the generalised sidelobe canceller and the adaptive system for microphone-array noise reduction (AivINOR) are evaluated in varying noise conditions and for different array geometries. The effect of complementing each technique with a postfilter is also assessed. A novel beamformer, termed the near-field adaptive beamformer (NFAB), is introduced and then shown to prov

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22

Bunyakin, A. V., and A. A. Vasilchenko. "Structure of quantum levels for two-dimentional electron in the homogeneous magnetic field and the potential confining near to the ring." Thesis, Sumy State University, 2011. http://essuir.sumdu.edu.ua/handle/123456789/20581.

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Studying of properties of quantum rings (nano-scaling and mesoscoping ring structures) in a magnetic field is one of directions on which there are interesting results (see, for example, [1]). Quantum transitions in such structures are accompanied by radiation on border of infra-red light, and interest is caused by periodic structures in which quantum rings are cooperate with neigh calls in pseudo-crystal. In the given work results of calculations of such structure in two-dimension statement (periodicity is provided with decomposition of the solution in Fourier series on both spatial coor

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23

Kopecký, Petr. "Automatizace měření EM pole měřičem Narda NBM-550." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219160.

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The diploma thesis deals with the measurement of electromagnetic fields by the meter NARDA NBM 550. The aim of the paper is to introduce the possibilities of measurement of the electromagnetic field by this device, to study the feasibility of communication with computer, to create control program and to check its functionality. A description of the electromagnetic field properties is followed by the identification of the device main functions. Additionally, the operating program is described together with the draft of measuring workplace with its realization. The results of probationary measur

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24

Van, Zyl Derrick Steven. "SQUID detected low-field NMR for the evaluation of internal fruit quality." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/5208.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: Assessing the quality of fruit has become vitally important for farmers and growers. With retailers placing ever stricter requirements on fresh produce, growers have to spend a greater amount of time and effort sorting and grading their harvest. Increasingly, vendors are placing requirements not only on external factors like colour, and firmness, but on internal quality factors such as sugar content and acidity, because, although consumers buy fruit based on their external appe

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25

Olk, Phillip. "Optical Properties of Individual Nano-Sized Gold Particle Pairs." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1218612352686-00553.

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This thesis examines and exploits the optical properties of pairs of MNPs. Pairs of MNPs offer two further parameters not existent at single MNPs, which both affect the local optical fields in their vicinity: the distance between them, and their relative orientation with respect to the polarisation of the excitation light. These properties are subject of three chapters: One section examines the distance-dependent and orientation-sensitive scattering cross section (SCS) of two equally sized MNPs. Both near- and far-field interactions affect the spectral position and spectral width of the SCS. F

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26

Zhang, Xingguang. "Plasmonic photocatalysts of supported gold nanoparticles for organic conversions." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/67714/4/Xingguang_Zhang_Thesis.pdf.

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This thesis is a comprehensive study of plasmonic gold photocatalysts for organic conversions. It presents the advantages of plasmonic gold photocatalysts in the selective oxidation, reduction, and acetalisation. It is discovered that plasmonic gold photocatalysts exhibit better catalytic performance (higher selectivity or activity) in these organic conversions. The study in this thesis highlights the capacity of plasmonic gold photocatalysts in harvesting solar energy for converting organic raw materials to value-added chemicals, and the great potential of gold photocatalysts in chemical prod

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27

Halidi, El Mohamed. "Études RMN et IRM en champ proche : développements et applications." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20261/document.

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Le principe de la RMN repose sur la détection de l'aimantation provenant de spin des noyaux atomiques tels que 13C, 31P et 1H. L'échantillon est placé dans un champ magnétique statique, qui polarise l'ensemble des spins. Ces derniers sont ensuite excités par les impulsions radiofréquences (environ un mètre de longueur d'onde), qui font basculer l'aimantation de ces spins dans le plan transversal. Lorsque l'aimantation retourne à sa position d'équilibre, il génère un champ électromagnétique qui est classiquement détecté par une antenne réceptrice (bobine avec un circuit d'accord/d'adaptation) à

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28

Daiki, Mossaab. "Contribution au développement d’antennes lecteurs champ proche pour les systèmes RFID UHF passifs." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENT020/document.

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La RFID est une technologie majeure qui connaît depuis plus d'une dizaine d'années un essor considérable en termes d'applications. Cependant son déploiement à grande échelle reste limité par des plusieurs verrous technique et technologique par lesquels la portée de lecture des tags et leur forte sensibilité à l'environnement de l'application. Le travail engagé dans cette thèse vise le développement des nouvelles antennes lecteurs pour systèmes RFID UHF champ proche. Ce type de système exploite la bande UHF de la RFID en zone de champ proche pour la traçabilité des cibles de taille miniature su

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29

Tan, Shiaw Juen. "Linear and nonlinear propagation of localised plasmon in metallic nanostructures." Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/52635/1/Shiaw_Tan_Thesis.pdf.

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A major challenge in modern photonics and nano-optics is the diffraction limit of light which does not allow field localisation into regions with dimensions smaller than half the wavelength. Localisation of light into nanoscale regions (beyond its diffraction limit) has applications ranging from the design of optical sensors and measurement techniques with resolutions as high as a few nanometres, to the effective delivery of optical energy into targeted nanoscale regions such as quantum dots, nano-electronic and nano-optical devices. This field has become a major research direction over the la

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30

Vogel, Michael Werner. "Theoretical and numerical investigation of plasmon nanofocusing in metallic tapered rods and grooves." Thesis, Queensland University of Technology, 2009. https://eprints.qut.edu.au/29241/1/Michael_Vogel_Citation.pdf.

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Effective focusing of electromagnetic (EM) energy to nanoscale regions is one of the major challenges in nano-photonics and plasmonics. The strong localization of the optical energy into regions much smaller than allowed by the diffraction limit, also called nanofocusing, offers promising applications in nano-sensor technology, nanofabrication, near-field optics or spectroscopy. One of the most promising solutions to the problem of efficient nanofocusing is related to surface plasmon propagation in metallic structures. Metallic tapered rods, commonly used as probes in near field microscopy and

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Vogel, Michael Werner. "Theoretical and numerical investigation of plasmon nanofocusing in metallic tapered rods and grooves." Queensland University of Technology, 2009. http://eprints.qut.edu.au/29241/.

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Effective focusing of electromagnetic (EM) energy to nanoscale regions is one of the major challenges in nano-photonics and plasmonics. The strong localization of the optical energy into regions much smaller than allowed by the diffraction limit, also called nanofocusing, offers promising applications in nano-sensor technology, nanofabrication, near-field optics or spectroscopy. One of the most promising solutions to the problem of efficient nanofocusing is related to surface plasmon propagation in metallic structures. Metallic tapered rods, commonly used as probes in near field microscopy and

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32

Manseur, Megdouda. "Contribution à l’étude d’un système de biotélémesure intracorporelle par gélule ingérable." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14430/document.

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Cette thèse est une contribution à l’étude d’un système de biotélémesure par gélule ingérable. L’étude concerne les problèmes de télétransmission d’énergie et d’informations entre la gélule ingérable et le système extracorporel de télécommande.Nous exposons des méthodes de conception théoriques et de caractérisation expérimentales du système de télécommande sans fil de la mise sous tension des gélules. Une deuxième partie concerne la conception du système de télétransmission d’énergie et d’informations par induction magnétique, suivi de la réalisation d’un système d’accord automatique par capa

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33

Schoenmaker, Jeroen. "Desenvolvimento de um microscópio óptico e magnetoóptico de varredura em campo-próximo." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-26052009-102436/.

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Para o desenvolvimento da nanociência atual há forte demanda por equipamentos capazes de caracterizar sistemas em escalas da ordem nanométrica. Este contexto impulsionou o desenvolvimento de microscópios ópticos de varredura em campopróximo (Scanning Near-field Optical Microscope SNOM). Diferentemente da microscopia óptica tradicional, os SNOMs detectam a radiação eletromagnética evanescente e, conseqüentemente, a resolução não é limitada pelo critério de Rayleigh. No Laboratório de Materiais Magnéticos IFUSP desenvolvemos um SNOM sensível a efeitos Kerr magnetoópticos (MO-SNOM). Dessa mane

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Hermany, Jiří. "Záření soustav antén v blízké zóně." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217536.

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The aim of my diploma thesis is to analyze the antenna array radiation and to produce the antenna array radiation computation program. The program should display the electric and magnetic intensity and radiation power density distribution over the planar or cylindrical surface in the near-field area. The antenna array analyzed in this paper consists of a number of elementary dipoles placed in a row with a reflector which represents the conductive board situated in parallel to the row of dipoles. The demonstration program was built in MATLAB and allows computing and displaying the computed valu

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Legris, Michel. "Identification de l'état magnétique d'un système ferromagnétique à partir de mesures du champ proche." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0170.

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Pour connaître l'état magnétique d'un objet complexe, bien souvent la seule solution est de mesurer l'induction créée par la pièce en un nombre discret et fini de points. La difficulté est alors de remonter à l'aimantation à partir de ces mesures. Nous commençons d'abord par présenter le problème de manière intuitive ainsi que les hypothèses de départ. Ensuite, en s'inspirant des travaux effectués dans plusieurs domaines technologiques où des difficultés similaires surgissent, nous élaborons une stratégie de résolution. Celle-ci se décompose en deux parties : d'une part, la création d'un modèl

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36

Ernandes, Cyrine. "Manipuler l'émission et l'absorption de transitions dipolaires magnétiques par l'utilisation de nano-antennes optiques." Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS091.

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Au cours des dernières années, les progrès technologiques dans le domaine de la nanophotonique ont permis le développement des nanostructures optiques. Ces dernières possèdent la particularité de modifier l'émission lumineuse de nanoémetteurs quantiques .Cependant, l’interaction lumière-matière est considérée comme étant véhiculée par le champ électrique. Les études se sont alors concentrées sur le contrôle et la modification des propriétés d'excitation et d'émission des transitions dipolaires électriques.Récemment, il a été décrit qu’il existe dans la nature des nanoémetteurs possédant des tr

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Legris, Michel. "Identification de l'état magnétique d'un système ferromagnétique à partir de mesures du champ proche." Phd thesis, Grenoble INPG, 1996. http://tel.archives-ouvertes.fr/tel-00869936.

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Pour connaître l'état magnétique d'un objet complexe, bien souvent, la seule solution est de mesurer l'induction créée par la pièce en un nombre discret de points. La difficulté est alors de remonter à l'aimantation à partir de ces mesures. Une modélisation des * sources magnétiques est d'abord recherchée. La décomposition en harmoniques sphériques du champ mesurable ainsi que la recherche de dipôles normaux équivalents répartis sur la surface de l'objet sont étudiées. Leurs avantages et inconvénients étant très complémentaires, un nouveau modèle, synthèse des deux précédents, est proposé. Ens

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El, Hatmi Fatiha. "Conception d'antennes de communication à travers le corps humain pour le suivi thérapeutique." Phd thesis, Université Paris-Est, 2013. http://tel.archives-ouvertes.fr/tel-00962121.

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Avec le développement rapide des technologies sans fil modernes et la miniaturisation des antennes et des systèmes électriques, l'emploi des antennes à l'intérieur du corps humain pour le suivi thérapeutique est devenu possible. Des batteries permettent d'alimenter ces antennes ; la réduction de la consommation de puissance implique l'augmentation de la durée de vie de circuits ingérables. Le corps humain, qui a une conductivité non nulle, n'est pas un milieu idéal pour la transmission des ondes RF à cause de l'atténuation liée aux propriétés diélectriques des tissus biologiques. Cependant, le

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Chipunga, Tichaona. "Channel capacity enhancement for a near field magnetic induction communication system." 2010. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001331.

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M. Tech. Electrical Engineering.<br>The objective of this research is to model and simulate a high capacity and secure wireless communication protocol for personal area network. The high capacity of the system is achieved using Multiple Input Multiple Output (MIMO) technology while the security is ensured by using near field magnetic induction. The application targeted by this research confine to the military domain, where the confidentiality of the data exchanged is of prime importance. Computer simulations of MIMO application in near field magnetic induction communication were done and used

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Qiu, Huan Ke, and 邱煥科. "Magnetic-field shielding characteristics in the near-field region." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/17352433038076103793.

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Boybay, Muhammed Said. "Sensitivity Enhancement of Near Field Probes Using Negative Materials." Thesis, 2009. http://hdl.handle.net/10012/4597.

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In the last decade, design and application of negative materials have been one of the most interesting subjects in the electromagnetic research. The extraordinary properties of double negative (DNG) and single negative (SNG) materials have been studied extensively over this period. In this thesis, one of the unusual properties of negative materials, the evanescent amplification, is used to improve the sensitivity of the near field probes. The effect of placing DNG and SNG layers between the near field probes and the targets are investigated theoretically. A sensitivity definition is introduce

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Harrison, Richard K. 1982. "Mechanisms and applications of near-field and far-field enhancement using plasmonic nanoparticles." Thesis, 2012. http://hdl.handle.net/2152/19462.

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The resonant interaction of light with metal nanoparticles can result in extraordinary optical effects in both the near and far fields. Plasmonics, the study of this interaction, has the potential to enhance performance in a wide range of applications, including sensing, photovoltaics, photocatalysis, biomedical imaging, diagnostics, and treatment. However, the mechanisms of plasmonic enhancement often remain poorly understood, limiting the design and effectiveness of plasmonics for advanced applications. This dissertation focuses on evaluating the mechanisms of plasmonic enhancement and disti

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Duarte, Maria Inês Caramelo. "A novel plasmonic nanostructure for localized near-field light enhancement." Master's thesis, 2019. http://hdl.handle.net/10362/94398.

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The combination of plasmonic structures with dielectric materials, metallic oxides and in particular, with two dimensional (2D) materials has been a subject of great interest in the scientific community for a wide range of applications, such as optoelectronic devices, solar cells, or photochemistry. Plasmonic properties have the potential to enhance the capabilities of 2D materials for harvesting light, which alone have a low efficiency due to low absorption (approximately only 11%). This work presents a new plasmonic structure, “nanohippo” with a perspective to integrate a monolayer mat

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Wong, Rong-Tsann, and 翁榮燦. "Planar Near Field to Far Field Transformation Using Equivalent Magnetic Current Approach." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/94758142368369998262.

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碩士<br>國立交通大學<br>電信工程系<br>88<br>n this thesis, we discuss the planar near field to far field transformation using equivalent magnetic current approach. Utilizing equivalence principle and image theory to replace antenna with equivalent magnetic currents, the equivalent magnetic current plane has to encompass the antenna under test. The equivalent magnetic currents are used to determine far field pattern. Under certain approximations, the equivalent magnetic current approach can produce correct far field pattern regardless of the shape of the antenna under test. From proper derivations, an elect

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Masihpour, M. "Cooperative communication in near field magnetic induction communication systems." Thesis, 2012. http://hdl.handle.net/10453/21879.

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University of Technology, Sydney. Faculty of Engineering and Information Technology.<br>Near-Field Magnetic Induction Communication (NFMIC) is a relatively new technology which has been proposed for short-range applications such as body-area networks. Since it uses a rapidly-decaying magnetic near-field instead of an electromagnetic wave as the signal transmission mechanism, it is ideal for situations in which limited transmission range is actually an advantage, such as where minimising internetwork interference or avoiding location disclosure are considered important. To date, little work ha

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Liu, Jun-Cheng, and 劉俊呈. "Design and Realization of Near Field Antennas for Magnetic Resonance and Magnetic Induction." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/7u6cet.

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碩士<br>國立高雄應用科技大學<br>光電與通訊工程研究所<br>105<br>The design and analysis of magnetic resonance and magnetic induction antennas are presented. Two winding coils are proposed for the magnetic resonance antenna with operating frequency of 6.78 MHz and for the frequency band at 13.56 MHz. The electromagnetic simulation software HFSS is used to optimize the design process. The fakerated coils are measured (S-parameters, transmission coefficiency) to compane with the simulation results. The magnetic resonance antennas with gradient space and equidistance space are analyzed. The gradient space antenna has he

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Chen, Yan-chi, and 陳彥志. "Stray field magnetic resonance imaging：system construction, sensitivity enhancement and applications." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/50087612414809411728.

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Wu, Chia-Chu, and 吳家駒. "Electro-Magnetic Analysis of Near Field Wireless Power Transfer Modules." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/8k4ztw.

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碩士<br>國立臺北科技大學<br>冷凍空調工程系所<br>102<br>Since mobile phones, electric vehicles and related applications vigorously emerge, wireless charging become an attractive technology for more convenient usage.Therefore, wireless power transmission league and protocol also appeared to promote this technology. The two main league are known as Wireless Power Consortium (WLC) and Alliance for Wireless Power (A4WP). The research of this article used the wireless power transmission module which developed by the ferrite vendor. We designed for inductors for differentleagues, combo inductors for Near Field Communi

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Shen, Tzu-Wei, and 沈資偉. "Research on Hall sensors applied to Near-field Magnetic Induction Communication." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/31314742070281604596.

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碩士<br>國立交通大學<br>電子工程學系電子研究所<br>103<br>There is a recent trend of Internet of Things (IOT) in modern wireless communications. Due to the various applications in IOT, there are many challenges, too. (e.g., low power consumption, high data rates, and the small volume). Because many applications of IOT are used in short-distance wireless communication. Thus, choosing a suitable wireless communication method in short distance is very important. For instance, Radio-Frequency identification (RFID) is suitable for air medium, and Near Field Magnetic Induction Communication (NFMIC) is suitable for non

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Mendes, Manuel João de Moura Dias. "Near-field nanophotonic structures for localized light enhancement in intermediate band solar cells." Doctoral thesis, 2012. http://hdl.handle.net/10362/48651.

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Tese arquivada ao abrigo da Portaria nº 227/2017 de 25 julho.<br>This doctoral thesis explores some of the possibilities that near-field optics can bring to photovoltaics, and in particular to quantum-dot intermediate band solar cells (QD-IBSCs). Our main focus is the analytical optimization of the electric field distribution produced in the vicinity of single scattering particles, in order to produce the highest possible absorption enhancement in the photovoltaic medium in their surroundings. Near-field scattering structures have also been fabricated in laboratory, allowing the applicat

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