Дисертації з теми "Electromagnetic Periodic Structures"
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Refig, Andre. "Computational electromagnetic analysis of periodic structures." Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520979.
Повний текст джерелаMorozov, 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.
Повний текст джерелаSudhakaran, 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.
Повний текст джерелаMias, 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.
Повний текст джерелаMaier, Stefan [Verfasser]. "Guiding of electromagnetic energy in subwavelength periodic metal structures / Stefan Maier." Hamburg : Diplom.de, 2003. http://d-nb.info/1184908478/34.
Повний текст джерелаLindberg, 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.
Повний текст джерелаI detta examensarbete, analyseras elektromagnetisk v°agutbredning i periodiskav°agledarstrukturer som uppvisar glid symmetri. Analysen genomf¨ordes genom enmod matchnings-teknik som korrelerar de olika mod-koefficienterna fr°an separeraderegioner i strukturen med varandra. Denna teknik anv¨ands f¨or att ta framdispersionsrelationen f¨or tv°a endimensionella periodiska strukturer: en glid symmetriskkorrugerad meta-yta och en koaxial ledare belagd med periodiskt urgr¨opdah°aligheter. Mod matchnings-formuleringen presenteras i Kartesiska och cylindriskakoordinatsystem respektive f¨or de ovan n¨amnda fallen. Mod matchnings-resultatenj¨amf¨ors med data-simulerade resultat erh°allna fr°an CST Microwave Studio och de¨overenst¨ammer v¨al med varandra.
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.
Повний текст джерелаs functions that approximate electric field of an infinitesimal dipole on the periodically implanted substrate. Using the calculated Green&rsquo
s functions and the spectral domain MoM procedure, dispersion characteristics of a microstrip line on the periodically implanted substrate are obtained.
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.
Повний текст джерелаThe subject of this thesis is scattering of electromagneticwaves from planar and curved periodic structures. The problemspresented are solved in the frequency domain.
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. Theproblem is solved by expanding the .elds and constitutiveparameters in quasi-periodic and periodic functionsrespectively, which are inserted into Maxwells equations.Through various inner products de.ned with respect to the cell,and elimination of the longitudinal vector components, a linearsystem of ordinary di.erential equations for the transversecomponents of the .elds is obtained. After introducing apropagator, which maps the .elds from one transverse plane toanother, the system is solved by backward integration.Conventional thin metallic FSS screens of patch or aperturetype are included by obtaining generalised transmission andre.ection matrices for these surfaces. The transmission andre.ection matrices are obtained by solving spectral domainintegral equations. Comparisons of the obtained results aremade with experimental results (in one particular case), andwith results obtained using a computer code based on afundamentally di.erent time domain approach.
Scattering from thin singly curved structures consisting ofdielectric materials periodic in one dimension is alsoconsidered. Both the thickness and the period are assumed to besmall. The .elds are expanded in an asymptotic power series inthe thickness of the structure, and a scaled wave equation issolved. A propagator mapping the tangential .elds from one sideto the other of the structure is derived. An impedance boundarycondition for the structure coated on a perfect electricconductor is obtained.
Keywords:electromagnetic scattering, periodicstructure, frequency selective structure, frequency selectivesurface, grating, coupled wave analysis, electromagneticbandgap, photonic bandgap, asymptotic boundary condition,impedance boundary condition, spectral domain method,homogenisation
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.
Повний текст джерелаPolat, 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.
Повний текст джерелаinfinite 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 semi-infinite planar dipole array in which modified Kirchhoff approximation is used. The accuracy and the validity of the asymptotic analytical solutions are compared with the numerical solutions available in the literature before.
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.
Повний текст джерелаCasselbrant, 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.
Повний текст джерелаKambisseri, 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.
Повний текст джерелаTrådlösa sensorer används allmänt för tillståndsövervakning i elektriska maskiner. Metallhöljet hos en elektrisk motor begränsar signalen från sensorerna från att stråla utåt. Signalen från metallhåligheten behöver styras till den enda öppningen i höljet, genom ett smalt mellanrum mellan statorn och den roterande rotorn. Gap-vågledarteknik föreslås som en lösning genom att strukturera statorytan med elektromagnetiska bandgap-strukturer (EBG). Arrayer av periodiskt håliga strukturer används för att realisera metayt-vågledare. Två Bravais gitterkonstruktioner –kvadratiska och sexkantiga, undersöks för styrning av vågor längs en önskad väg i en parallellplattvågledare. Simuleringar utförs för att studera påverkan av olika dimensioner hos enhetscellerna. En vågledare med hexagonal håltypsenhetscell är konstruerad och tillverkad för experimentell verifiering. Möjligheten att utvidga samma teknik till cylindrisk yta bekräftas genom simuleringar.
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.
Повний текст джерелаLiu, Zicheng. "Electromagnetic modeling and imaging of damages of fiber-reinforced composite laminates." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS332.
Повний текст джерелаMy PhD work is about electromagnetic modeling and imaging of disorganized periodic structures. A certain pattern in an elementary subdivision (a “cell”) is repeated in the other cells of the structure into certain directions of space. This repetition is disorganized by a change of material properties and/or geometries of the constitutive parts, within one or more cells. At first level of modeling, these panels are a succession of planar plates one over the other. Each consists of a regular linear arrangement of long cylinders with same finite circular sections, all orientated into the same direction: we call them “fibers”, each cylinder resulting from the assumption of a bundle of small-size fibers. The constitutive material of the fibers differs from the embedding material (matrix) that they reinforce. Each plate is made of fibers with different axes for sturdiness. There are few or many plates, with repetition of a small stack of plates. For conductive panels (carbon-based), imaging is MHz; for lossless or weakly lossy panels (glass based), imaging is microwave (a few tens GHz, possibly more). There might be missing/displaced cylinders inside a plate, with consequent changes in possibly several cells, adjacent or not. Local damages might occur also, leading to changes in shape or electromagnetic properties of one or more cylinders in one or more cells in one or more plates. Randomness in distribution of the inclusions might account for uncertainties of positioning with respect to assumed geometries. Properly illuminating the structures and collecting the resulting fields (in the near-field hopefully, possibly in the far-field) should allow their imaging and concur to their diagnostics. So, a periodic structure under interrogation is disorganized. One wishes to successfully image the structure while taking care at best of prior information on periodicity and disorganization, on sensing systems, and obviously of needs and limitations of the testing. The PhD benefits from a grant from the Chinese Scholarship Council
Li, Changyou. "Electromagnetic modeling and simulation of fiber-reinforced periodically-structured planar laminates." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112219/document.
Повний текст джерелаThe contribution is about the electromagnetic modeling of fiber-reinforced periodically organized composite laminates. The final goal is to gain a good understanding of their electromagnetic behavior as well as to acquire images that should exhibit the location of possibly damaged zones, and provide some quantification of these zones. The thesis focuses on the scattering of well-organized periodic structures and building up an efficient full-wave computational model for multilayered composites, wherein each layer is reinforced by periodically arranged fibers, which is the first step for further investigation of the disorganized one.The work firstly considered the scattering problem of a slab in which infinite circular fibers, with the same radius, are periodically embedded with the same orientation of their axes and the same center-to-center distance. A 2-dimensional problem with normally and obliquely incident E- and H-polarized plane waves as well as Gaussian beams is firstly considered for understanding the principles and philosophies of the used mode-matching method and multipole expansion. Then the work is extended to the investigation if the scattering of the slab under illumination of a conically incident 3-dimensional electromagnetic wave, which shows the potential of the work for obtaining the response of the structure to a point source.A more practical but complicated multilayered composite, constructed by stacking up the slabs one over the other, is further investigated. Two different composites are taken into account. To study the first composite, with fibers in different layers having the same orientations, T-matrix- and S-matrix-based methods are introduced into the work for solving the linear system produced by mode-matching at the boundaries between two adjacent layers. Then, further investigation of the second kind of composite, wherein the fibers within different layers are orientated into different directions, is carried out by extending the approach properly.Some attention is also given to homogenization issues, so as to link small-scale approaches as developed in the thesis with large-scale ones as often considered in non-destructive testing of composite laminates.Extensive numerical simulations are proposed, validated whenever possible by reference results taken from the literature (notably in the case of photonic crystals) and the use of brute-force solvers. Emphasis is also on special cases of composites (glass-fiber- and graphite-fiber-based ones) as most often faced in practical applications, with appropriate frequency bands in harmony with the dielectric or conductive aspect of the fibers
Kula, Jeffrey Scott. "Reconfigurable Band Rejection Frequency Selective Structures." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1545336272765337.
Повний текст джерелаSilva, 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.
Повний текст джерелаTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
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
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 metamateriais. Para tanto, o mecanismo de trabalho dessas estruturas foi extensivamente estudado, e um método próprio, baseado no modelo de circuito equivalente em conjunto com simulações de onda completa foi proposto. A ferramenta desenvolvida é útil para uma análise preliminar rápida de FSS, a qual foi utilizada para criar uma base de dados de elementos conhecidos na literatura. Diferente dos modelos de análise clássicos, a modelagem analítica proposta, que é uma das principais contribuições do trabalho, usa um simples algoritmo para aproximar a resposta de superfícies seletivas em frequência com geometrias arbitrárias, para incidências normal e oblíqua e para substratos com quaisquer espessuras. Nesse sentido, após a simulação eletromagnética da estrutura, é possível computar a resposta de uma FSS com diferentes parâmetros sem o consumo de tempo das simulações de onda completa. O modelo usa as características peculiares de superfícies de alta impedância, HIS - High Impedance Surface, que dentro de determina faixa comporta-se como condutor magnético perfeito, PMC - Perfect Magnetic Conductor, enquanto no restante da banda tem comportamento de um condutor elétrico perfeito, PEC - Perfect Electric Conductor, para sintetizar absorvedores finos e planares de micro-ondas. As estruturas, compostas de superfície seletiva em frequência resistivas sobre um substrato dielétrico aterrado, são projetadas visando aplicação em diferentes faixas de frequência de absorção e diferentes larguras de banda. Na faixa de 5,5 GHz, objetivou-se satisfazer as especificações dos sistemas WIMAX, WLAN, com os padrões IEEE 802.11a, bem como sistemas de radar, enquanto sinais de outras faixas podem trafegar com atenuação mínima ou nula. Para a faixa mais elevada, projetou-se uma estrutura que oferece absorção sobre a faixa de frequências de 10 GHz a 18 GHz, que pode ser empregada visando aplicações na banda-X e banda-Ku. O método de modelagem para a FSS e para os absorvedores propostos foi validado fisicamente através de montagens experimentais e instrumentação, especialmente desenvolvidas para estas estruturas. Os protótipos dos absorvedores fabricados são extremamente finos e foram medidos por meio de setups de medida em campo aberto e em câmara anecóica. As estruturas projetadas mostraram excelente desempenho para as faixas medidas, mantendo refletividade tipicamente abaixo de -10 dB ao longo de toda a banda. A metodologia desenvolvida nesta pesquisa pode ser ampliada para diferentes faixas de frequências, larguras de banda e aplicações
Abstract: In this work, the different properties of frequency selective surfaces - FSS are analyzed. Frequency selective surfaces are planar structures with periodic cells and can be classified as a kind of metamaterials. To this end, the working mechanism of these structures has been extensively studied, and a proper method based on the equivalent circuit model in conjunction with full-wave simulations was proposed. The developed tool is useful for a fast preliminary analysis of FSS, which was used to create a database of known elements presented in the literature. Unlike of classical analysis model, the proposed analytical modeling, which is one of the main thesis contributions, uses a simple algorithm for approximate the response of frequency selective surfaces with arbitrary shape, for normal and oblique incidence and for substrates with all thicknesses. In this sense, after the electromagnetic simulation of the structure, it is possible to compute the response of an FSS with different parameters without the time consuming full-wave simulations. The model uses the unique characteristics of High-Impedance Surfaces - HIS, which for certain frequency range, behaves as Perfect Magnetic Conductor - PMC, while outside this band behaves as a Perfect Electric Conductor - PEC, for synthesizing thin planar microwave absorbers. The structures, comprising resistive frequency selective surfaces over a grounded dielectric substrate, are designed aiming different absorption frequency bands and different bandwidths. In the 5.5 GHz frequency range, the aim was to satisfy the specifications of WiMAX, WLAN systems, in view of the IEEE 802.11a standards, as well as radar systems, while signals from other bands can travel across with zero or minimal attenuation. To the highest range, the designed structure provides absorption over 10 GHz to 18 GHz frequency range, and can be applied to the X- and Ku- band. The modeling method for the FSS and the proposed absorbers was physically validated through experimental setups and instrumentation, especially developed for these structures. The prototype of the fabricated absorbers are extremely thin and were characterized by using free space and anechoic chamber measurement setups. The designed structures showed excellent performance for measurements ranges, with reflectivity typically below -10 dB over the entire band. The methodology developed in this research can be extended to different frequency bands, bandwidth and applications
Doutorado
Eletrônica, Microeletrônica e Optoeletrônica
Doutor em Engenharia Elétrica
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.
Повний текст джерелаMaalik, 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.
Повний текст джерелаRen, 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.
Повний текст джерелаBarros, Fabien de. "Conception, Réalisation et Caractérisation de papiers fonctionnels pour des applications de filtrage électromagnétique." Thesis, Grenoble, 2011. http://www.theses.fr/2011GRENT118/document.
Повний текст джерелаThe electromagnetic smog in which we live today is nowadays a real issue because it limits the use of certain technologies and also because there are some potential health risks associated with it, even if the latter is still a controversial subject. The importance of the interferences between wireless networks or the possibility of data hacking on the same networks are two examples. The aim of this thesis is to develop a new way to protect buildings against some of these electromagnetic waves. More specifically, this work focuses on a technology able to filter only the WiFi and the GSM waves through large areas of a home, like a wall for example. To do this, the functionalization of a standard component of buildings, the wallpaper, was studied. The use of frequency selective surface (FSS) was chosen. These patterns are printed directly on paper with a conductive ink printing technology: the flexography. The study also focuses on the realization of innovative filter designs. Simulation results show that these novel FSS are able to filter two or three bands. They are almost insensitive to the polarization and to the angle of incidence in the range of 0° to ±80°. The realization feasibility of this concept in a laboratory or in industrial conditions was demonstrated. Next, an experimental demonstration of this concept in the WiFi bands was carried out. In this context, the transmission coefficient was reached -30 dB. Finally, an experimental validation of the product in real conditions of use was conducted, namely the wallpaper was put over plasterboards or over wood panels. Also, the influence of the glue on the general performances and the placement of a decorative wallpaper over the FSS wallpaper were studied. In conclusion, the practical results obtained confirm and validate the theoretical predictions of this new concept, called metapaper, and show that the practical realizations are efficient enough to allow the reduction of WiFi or GSM signals
Maier, Stefan Alexander. "Guiding of Electromagnetic Energy in Subwavelength Periodic Metal Structures." Thesis, 2003. https://thesis.library.caltech.edu/515/1/thesis.pdf.
Повний текст джерелаThe 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.
As a macroscopic analogue to plasmon waveguides, the transport of electromagnetic energy in the microwave regime along closely spaced centimeter-scale metal rods is examined. Full-field electrodynamic simulations show that information transport occurs at a group velocity of 0.65c for fabricated structures consisting of copper rods excited at 8 GHz. A variety of passive routing structures and an all-optical modulator are demonstrated.
The possibility of guiding electromagnetic energy at visible frequencies with mode sizes below the diffraction limit using plasmon waveguides is analyzed using a point-dipole model and finite-difference time-domain simulations. It is shown that energy transport occurs via near-field coupling between metal nanoparticles, which leads to coherent propagation of energy. For spherical gold particles in air, group velocities up to 0.06c are demonstrated, and a change in particle shape to spheroidal particles shows up to a threefold increase in group velocity. Pulses with transverse polarization are shown to propagate with negative phase velocities antiparallel to the energy flow.
Plasmon waveguides consisting of gold and silver nanoparticles were fabricated using electron beam lithography. The key parameters that govern the energy transport are determined for various interparticle spacings and particle chain lengths using far-field measurements of the collective plasmon modes. Spherical gold nanoparticles with a diameter of 50 nm and an interparticle spacing of 75 nm show an energy attenuation of 6 dB/30 nm. This loss can be reduced by one order of magnitude by a geometry change to spheroidal particles. Using the tip of a near-field optical microscope as a local excitation source and fluorescent nanospheres as detectors, experimental evidence for energy transport over a distance of 0.5 micron is presented for plasmon waveguides consisting of silver rods with a 3:1 aspect ratio.
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.
Повний текст джерела國立臺灣大學
電信工程學研究所
105
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 validate the accuracy of the proposed analysis and design. Finally, miniaturization of the non-periodic EBG is also addressed.
Liu, Xing-Xiang. "Generalized homogenization theory and inverse design of periodic electromagnetic metamaterials." Thesis, 2013. http://hdl.handle.net/2152/25165.
Повний текст джерелаtext
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.
Повний текст джерела國立臺灣大學
光電工程學研究所
99
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 confinements of electromagnetic waves in a unit cell of arrays support new pathways to excite various site resonances involving geometrical resonance, surface plasmon resonance, guided mode resonance, and Fabry-Perot resonance. In another aspect, the collective behavior contributed from the periodicity of subwavelength arrays provides lattice resonances, which can be tuned by lattice arrangements. In particular, the coupling between these resonances, which is related to Fano resonances, brings about lots of degree of freedoms in design, and possesses a great number of potential applications. In this thesis, multiple Fano resonances in asymmetric multi-stripe arrays with two-dimensional rectangular grid, which have potential applications in multi-band filters, are investigated first. The underlying mechanism is illustrated by analyzing field pattens. Another fascinating filtering feature, extraordinary absorption related to Fano resonances, is studied next. We propose one-dimensional compound gratings with anomalous optical absorption associated with bounding, antibounding, and semibounding surface plasmon modes. The demonstrated structures can be applied to photodetectors. In contrast to subwavelength arrays with conducing materials, those made of dielectrics with high permittivity are also investigated, and we finally study the other important capability of subwavelength arrays: effective optical parameters, by means of homogenization. Negative effective permittivity and effective permeability occur simultaneously in the feasible wavelength region for s-polarized incidence, and give rise to negative index of refraction.
Maldovan, Martin. "Methods for Calculating the Optical Band Structure of Photonic Composites." 2002. http://hdl.handle.net/1721.1/3981.
Повний текст джерелаSingapore-MIT Alliance (SMA)
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.
Повний текст джерела明新科技大學
電機工程系碩士在職專班
105
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 topics are worth exploring in depth. In this paper, the effect of coplanar waveguide discontinuous connection is proposed, and an electromagnetic energy gap coplanar waveguide ground fault structure filter is proposed. In this paper, we will study the influence of the size of a single element on the resonant frequency, and the effect of the single element on the resonant frequency after the different unit elements are connected in series to the resonant frequency, and the unit elements are connected in different numbers. Resonant frequency, and then through the theory and electromagnetic simulation software (IE-3D) analysis to explain the electromagnetic energy gap wave and propagation characteristics.
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.
Повний текст джерела逢甲大學
電子工程所
91
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 measured results is shown. The DEPS not only significantly improves the stopband rejection but also increases its bandwidth. In additions, we also employ this technique into power amplifier for harmonic tuning. It is found that the DEPS power amplifier can obtain better power and power added efficiency (PAE) than another two cases. Last, we use the defected ground structure (DGS) to reduce the size of three branches coupler and increase the characteristic impedance of sub-shunt branch of three branches coupler. Measurement shows that it just occupies the area of two branches coupler, but it keeps the performance of three branches coupler. In addition, we also utilize this technique into balanced power amplifier to achieve a high broadband power amplifier.
Li, Dongying. "Efficient Time-domain Modeling of Periodic-structure-related Microwave and Optical Geometries." Thesis, 2011. http://hdl.handle.net/1807/27588.
Повний текст джерелаEmiroglu, Caglar D. "Transmission-Line Metamaterial Design of an Embedded Line Source in a Ground Recess." 2011. https://scholarworks.umass.edu/theses/606.
Повний текст джерела