Bibliographies thématiques / Tapered matching

Littérature scientifique sur le sujet « Tapered matching »

Auteur : Grafiati
Publié le 14 mars 2023

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Articles de revues sur le sujet "Tapered matching"

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Xie, Yangbo, Adam Konneker, Bogdan-Ioan Popa et Steven A. Cummer. « Tapered labyrinthine acoustic metamaterials for broadband impedance matching ». Applied Physics Letters 103, no 20 (11 novembre 2013) : 201906. http://dx.doi.org/10.1063/1.4831770.

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Zhang, Chunjin, Yongsheng Ren, Shujuan Ji et Jinfeng Zhang. « Analysis of the Vibration and Chatter Stability of a Tapered Composite Boring Bar ». Shock and Vibration 2020 (27 juin 2020) : 1–11. http://dx.doi.org/10.1155/2020/4190806.

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As metal boring bars have low dynamic stiffness, chatter is easily induced during the boring process. Therefore, improvement of the chatter stability is an open problem that requires further study. Though researchers proved that the composite materials suitable for making tapered boring bars can further improve the dynamic stiffness to meet the need of high-speed boring, existing research studies did not study the dynamic characteristics of the tapered composite boring bar comprehensively. In particular, no research has been done about the natural frequency and chatter stability of the composite boring bar under various taper ratios. Therefore, in this paper, a model of a tapered composite boring bar is established based on the Adomian modified decomposition method (AMDM). Second, this paper verifies the effectiveness of the AMDM by using the ANSYS software. Moreover, this paper studies the natural frequency of the boring bar model under various situations. Third, we verify the convergence of chatter stability of the boring bar model. Finally, the chatter stability of the tapered composite boring bar is analyzed comprehensively. The results show that the natural frequency and the chatter stability of the tapered model can be improved by choosing appropriate taper ratio, ply angle, stacking sequences, L/D ratio, T/D ratio, and the carbon composite. The results are helpful for the design of high-quality tapered composite boring bars matching the need of high speed cutting. In particular, these results can provide guidelines for adjusting the cutting speed in CNC boring and can further improve the surface finish of the machined workpieces.
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Kim, Seokjin, Hyekyoung Jwa et Hosung Chang. « Design of impedance-matching circuits with tapered transmission lines ». Microwave and Optical Technology Letters 20, no 6 (20 mars 1999) : 403–7. http://dx.doi.org/10.1002/(sici)1098-2760(19990320)20:6<403 ::aid-mop13>3.0.co;2-e.

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Vegni, L., A. Toscano et F. Bilotti. « Tapered stripline embedded in inhomogeneous media as microwave matching line ». IEEE Transactions on Microwave Theory and Techniques 49, no 5 (mai 2001) : 970–78. http://dx.doi.org/10.1109/22.920156.

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Payne, Philip W. « Tapered tube impedance matching underwater voice communicator with bubble silencer ». Journal of the Acoustical Society of America 79, no 2 (février 1986) : 586. http://dx.doi.org/10.1121/1.393520.

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Yu, Yinni, Phillip Blake et D. Keith Roper. « Tapered Optical Fibers Designed for Surface Plasmon Resonance Phase Matching ». Langmuir 25, no 1 (6 janvier 2009) : 59–63. http://dx.doi.org/10.1021/la801953z.

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Simons, R. N., et R. Q. Lee. « Impedance matching of tapered slot antenna using a dielectric transformer ». Electronics Letters 34, no 24 (1998) : 2287. http://dx.doi.org/10.1049/el:19981612.

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Song, Choongho, et Sangseol Lee. « Design of a tapered impedance-matching line using inverse scattering ». Microwave and Optical Technology Letters 32, no 5 (25 janvier 2002) : 393–96. http://dx.doi.org/10.1002/mop.10188.

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Al-Obaidi, Mohammed K., Ezri Mohd, Noorsaliza Abdullah, Samsul Haimi Dahlan et Jawad Ali. « Design and implementation of microstrip rotman lens for ISM band applications ». Bulletin of Electrical Engineering and Informatics 8, no 1 (1 mars 2019) : 90–98. http://dx.doi.org/10.11591/eei.v8i1.1392.

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This work presents the design and implementation of Rotman lens as a beam steering device for Industrial, Scientific, and Medical (ISM) applications. 2.45 GHz is considered as a center frequency design with (2-6) GHz frequency bandwidth. The beam steering is examined to cover ±21o scan angle with maximum main lobe magnitude 10.1 dBi, rectangular patch antennas are used as radiation elements to beam the output far field. The work is extended to compare between the tapered line which is used for matching between 50-Ω ports and lens cavity. CST microwave simulation studio results show that the rectangular taper line can yield 2 dB return loss less than linear taper line with a little bit shifting in responses for same input and load impedance.
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Abdulnabi, Hussein A., Refat T. Hussein et Raad S. Fyath. « UWB Single Port Log Periodic Toothed Terahertz Antenna Design Based on Graphene Artificial Magnetic Conductor ». Modern Applied Science 11, no 3 (14 janvier 2017) : 86. http://dx.doi.org/10.5539/mas.v11n3p86.

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In this work, a single port exponential tapered toothed log periodic antenna based on graphene artificial magnetic conductor (AMC) is suggested for ultra-wideband (1–10) THz operation. The resonance frequency of the proposed antenna can be tuned by changing the connected DC voltage which leads to variation in the chemical potential of the graphene.The radiating toothed log periodic antenna consists of gold patch placed on 25x25 graphene patches which act as an AMC surface unit. Exponential taper is used to satisfy impedance matching between the antenna and the feeder over the frequency range. The simulation results reveal that 90% of frequency range satisfies when the chemical potential is1eV.
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Thèses sur le sujet "Tapered matching"

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Shaver, Ryan J. « Analysis of the Tapered Transition Waveguide ». Wright State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=wright1431711280.

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Daengngam, Chalongrat. « Second-Order Nonlinear Optical Responses in Tapered Optical Fibers with Self-Assembled Organic Multilayers ». Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/77068.

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Owing to its centrosymmetric structure, the critical optical component of a silica fiber cannot to possess a second-order nonlinear optical susceptibility, Χ(²), preventing a silica fiber from many potential applications. Here, we theoretically and experimentally demonstrate a new technique to generate large and thermodynamically stable second-order nonlinearity into silica optical tapered fibers without breaking the centrosymmetry of the silica glass. The nonlinearity is introduced by surface layers with high polar-ordering fabricated by a novel hybrid covalent/ionic self-assembly multilayer technique. Despite the overall rotational symmetry of the nonlinear fiber, we observe significant second harmonic generation with ~ 400–500 fold enhancement of the SHG power compared to the traditional tapers. Phase matching for a SHG process in second-order nonlinear tapered fibers is also realized by the compensation of waveguide modal dispersion with material chromatic dispersion, which occurs only for submicron tapers where the modal dispersion is large. In addition, quasi-phase-matching for a nonlinear taper can be accomplished by introducing a periodic pattern into the nonlinear film coating. We use UV laser ablation for the controlled removal of particular nonlinear film segments on a taper surface in order to produce a Χ(²) grating structure. A resulting SHG enhancement from quasi-phase-matching is observed over a broadband spectrum of the pump light mainly due to the non-uniform shape of a taper waveguide. The laser ablation is a clean and fast technique able to produce well-define patterns of polymer films on either flat or curved substrate geometry. With surface layers containing reactive functional groups e.g. primary amines, we demonstrate that the resulting patterned film obtained from the laser ablation can be used as a template for further self-assembly of nanoparticles with high selectivity. A pattern feature size down to ~ 2μm or smaller can be fabricated using this approach. We also discuss preliminary results on a novel technique to further improve spatial accuracy for selective self-assembly of nanoparticles at an unprecedented level. Different types of nanoparticles are joined in order to form well-defined, molecular-like superstructures with nanoscale accuracy and precision. The technique is based on a selective surface functionalization of photosensitive molecules coated on metallic nanoparticles utilizing enhanced two-photon photocleavage at the plasmonically-active sites (hot spots) of the nanoparticles in resonance with an applied electromagnetic wave. As a result, the surface functional groups at the nanoparticle hot spots are different from the the other areas, allowing other kinds of nanoparticles to self-assemble at the hot spots with high degree of selectivity.
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Díaz, Caballero Elena. « Efficient analysis and design of devices in Substrate Integrated Waveguide (SIW) technology ». Doctoral thesis, Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/34627.

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Para abordar el análisis de estas estructuras de forma altamente eficiente, se pretenden utilizar dos enfoques distintos, que llevarían a dos técnicas distintas y eficientes, pero cada una de ellas con sus ventajas e inconvenientes respecto de la otra, que podremos concluir una vez finalizado el trabajo de investigación. Por un lado, se pretende utilizar el Método de los Momentos, una técnica numérica que convierte las ecuaciones integrales de un problema electromagnético en un sistema linear, expandiendo la magnitud desconocida usando un conjunto de funciones con coeficientes desconocidos. Al forzar las condiciones de contorno, en este caso de potencial eléctrico, en un determinado número de puntos, se obtiene un sistema linear de ecuaciones que será resuelto numéricamente. Por otro lado, según el segundo enfoque, pretende utilizar una expansión en modos cilíndricos del campo, tanto incidente como dispersado. Dada la geometría circular de las vías éstas pueden ser caracterizadas de forma analítica mediante espectros circulares. Posteriormente se resolverá el acoplo entre las vías mediante el método de [1] pero generalizado al caso de objetos inmersos en un medio dieléctrico infinito, y se desarrollará un nuevo método de acoplo modal entre modos cilíndricos y modos guiados proyectando las ecuaciones del acoplo modal tanto sobre modos cilíndricos como sobre modos guiados para evitar las singularidades que aparecen con el método de de [2] cuando los planos de referencia están muy próximos al objeto dispersor. Por tanto, esta técnica caracterizará las vías de forma analítica y resolverá las integrales del acoplo de modos mediante la transformada rápida de Fourier. Para aumentar más aún la eficiencia de ambos métodos se evitará repetir los cálculos para cada punto en frecuencia, y se implementará la técnica de barrido rápido en frecuencia similar descrita en [3], adaptándola al caso particular de cada método de análisis, aunque se prevé que quizá dicho procedimiento sea más difícil de implementar en el segundo método. Se espera que ambas técnicas puedan proporcionar unos tiempos de computación inferiores a los del software comercial de análisis electromagnético más habitual (i.e. HFSS), y también inferiores a otros métodos de análisis recientemente aparecidos en la bibliografía técnica ([4],[5],[6]). En concreto, se espera que los tiempos de computación para barrido discreto en frecuencia sea inferior con el segundo método ya que usa únicamente expresiones analíticas y transformada rápida de Fourier, pero, dado que el primer método es más susceptible de realizar barrido rápido en frecuencia, éste puede ser muy útil a la hora de realizar muchos análisis consecutivos. Una vez se disponga de métodos eficientes para el análisis de dispositivos SIW, se abordará el diseño de varios dispositivos pasivos en esta tecnología (filtros de diferentes topologías, diplexores, multiplexores, híbridos, acopladores, etc.). Como se dispone de una vasta experiencia en el grupo de investigación en el diseño de dispositivos en guía de onda rectangular, se puede como primera aproximación realizar el diseño en guía, y luego transformar esta estructura guiada en otra en tecnología SIW mediante unas reglas empíricas que relacionan ambas tecnologías [7]. Posteriormente se debe ajustar el diseño en el dispositivo SIW ya que estas reglas empíricas no consiguen que la respuesta sea idéntica a la del dispositivo guiado original, principalmente debido al hecho de que los irises rectangulares de la guía son transformados en vías metalizadas con geometría circular, no rectangular. Para minimizar este ajuste, se diseñará el dispositivo guiado con irises con esquinas redondeadas en la cavidad (método de [8] pero con un simulador más eficiente [9]), haciendo que el radio de esas esquinas redondeadas coincida con el de las vías metalizadas que se van a utilizar en el dispositivo SIW. Esto permitirá [...] (Ver documento anexo)
Díaz Caballero, E. (2013). Efficient analysis and design of devices in Substrate Integrated Waveguide (SIW) technology [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/34627
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Latry, Olivier. « Théorie des modes locaux dans les guides perturbés application : couplage fibre optique - photodiode PIN ». Rouen, 1995. http://www.theses.fr/1995ROUE5001.

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La réduction des dimensions des composants optoélectroniques constitue une contrainte importante pour un couplage optimal avec la fibre optique. Le but recherché étant de focaliser le maximum de lumière à l'intérieur de la couche intrinsèque de la photodiode, il faudrait donc envisager de réduire le diamètre de la fibre optique. Une étude du bout de la fibre est également menée et montre que pour une forme lentillée appropriée, il est possible d'adapter la distribution d'énergie entre fibre optique et photodiode. Le calcul du champ le long de ce guide de dimensions lentement décroissantes utilise la méthode des modes locaux. Cette méthode est employée car il n'y a pas de solutions exactes aux équations de Maxwell. En réalité, le champ total est la superposition des champs locaux et du champ radiatif. Les pertes d'énergie le long de ce guide sont analysées avec la théorie du couplage des modes locaux. On obtient alors un bilan le long de ce guide que l'on cherche à optimiser. La comparaison de ces résultats avec la simulation numérique quasi 3 D de la propagation optique guidée sur ALCOR est également réalisée. Ceci permet de définir la structure la mieux adaptée pour un couplage optimum entre la fibre et le composant
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« Modifying terahertz waveguide geometries : Bends, tapers, and grooves ». Thesis, 2012. http://hdl.handle.net/1911/70206.

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Terahertz waveguides are the focus of considerable research interest due to their potential for sensing, imaging and communications applications. Two of the most promising designs are the metal wire waveguide and the parallel-plate waveguide. The metal wire waveguide exhibits excellent low loss and low dispersion characteristics. However, the radiation is only weakly coupled to the wire and the beam extends a great distance from the waveguide, which can lead to high bending loss. In my research I show that this large beam extent also gives a high degree of flexibility in the geometry required to couple radiation into the waveguide or between waveguide sections. I also show that the traditional formalism of bending loss is incomplete, and that there is an optimum radius of curvature to reduce loss. The relationship between the beam extent and the radius of the wire presents the possibility of a tapered waveguide to confine the radiation as it propagates. I here present experimental data and simulations results to verify this subwavelength confinement at the tip of a tapered metal wire waveguide, which is of great interest for near-field imaging applications. The parallel-plate waveguide is another design frequently employed due to its low loss and low dispersion characteristics. Resonant structures may also be easily incorporated into the waveguide for sensing and filtering applications. One such structure is a single rectangular groove, which serves as a notch filter with a very narrow linewidth when the transverse-electric (TE) mode of the waveguide is excited, though its physical origin is poorly understood. In this work I present a detailed experimental and theoretical study of the rectangular resonant cavity in a TE-mode parallel-plate waveguide, particularly with respect to its potential as a microfluidic refractive index sensor. This study is extended to include the possibility of two grooves, in both coupled and non-coupled geometries, and their efficacy as multichannel or high-resolution single-channel microfluidic sensors.
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Chapitres de livres sur le sujet "Tapered matching"

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Butrym, A., et S. Pivnenko. « A Tapered Coplanar Strip Antenna with Improved Matching ». Dans Ultra-Wideband, Short-Pulse Electromagnetics 7, 342–53. New York, NY : Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-37731-5_38.

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Actes de conférences sur le sujet "Tapered matching"

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Haller, M. I., et B. T. Khuri-Yakub. « Tapered acoustic matching layers ». Dans 1993 IEEE Ultasonics Symposium. IEEE, 1993. http://dx.doi.org/10.1109/ultsym.1993.339558.

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Allen, Wesley N., et Dimitrios Peroulis. « Broadband tunable matching networks utilizing tapered lines ». Dans 2007 IEEE Antennas and Propagation Society International Symposium. IEEE, 2007. http://dx.doi.org/10.1109/aps.2007.4396197.

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Wu, Dawei, Alan Wright et Paul Harris. « Tapered microstructure for impedance matching using PDMS moulding ». Dans 2011 IEEE International Ultrasonics Symposium (IUS). IEEE, 2011. http://dx.doi.org/10.1109/ultsym.2011.0482.

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Chen, Su, et Zhuolin Liang. « The impedance matching analysis on different tapered line function ». Dans Multimedia Technology (IC-BNMT 2011). IEEE, 2011. http://dx.doi.org/10.1109/icbnmt.2011.6156009.

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Abeywickrama, Banie, Ampalavanapillai Nirmalathas, Christina Lim, Ka-Lun Lee et Malin Premaratne. « Quasi-phase matching with tapered waveguides for Terahertz generation ». Dans 2013 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR). IEEE, 2013. http://dx.doi.org/10.1109/cleopr.2013.6599979.

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Mamedes, Deisy Formiga, Joao Paulo Fernandes da Silva, Juliete da Silva Souza, Thamyris da Silva Evangelista, Thayuan Rolim de Sousa et Paulo Henrique da Fonseca Silva. « Analysis of impedance matching techniques in tapered microstrip patch antenna ». Dans 2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC). IEEE, 2017. http://dx.doi.org/10.1109/imoc.2017.8121034.

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Eid, A., J. Costantine, Y. Tawk, M. Abdallah, A. H. Ramadan et C. G. Christodoulou. « Multi-port RF energy harvester with a tapered matching network ». Dans 2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2017. http://dx.doi.org/10.1109/apusncursinrsm.2017.8072848.

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Saleh, Mohammed F. « Quasi-phase-matching sinusoidally-tapered waveguides for third-order parametric interactions ». Dans Conference on Lasers and Electro-Optics/Pacific Rim. Washington, D.C. : OSA, 2018. http://dx.doi.org/10.1364/cleopr.2018.w2b.3.

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Allen, Wesley N., et Dimitrios Peroulis. « Three-Bit and Six-Bit Tunable Matching Networks with Tapered Lines ». Dans 2009 IEEE Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF). IEEE, 2009. http://dx.doi.org/10.1109/smic.2009.4770492.

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Sun, Shiyu, Meng Huang, Dong Wu, Li Shen, Thomas W. Hawkins, John Ballato, Ursula J. Gibson, Goran Z. Mashanovich et Anna C. Peacock. « Role of Phase-matching on Raman-enhanced FWM in Silicon Core Fibers ». Dans CLEO : QELS_Fundamental Science. Washington, D.C. : Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_qels.2022.fth2a.7.

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Raman-enhanced four-wave mixing is investigated in silicon core fibers that have been tapered to control the phase-matching conditions. The large estimated conversion efficiencies (~1 dB) will be useful for high-power amplification of telecom signals.
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Rapports d'organisations sur le sujet "Tapered matching"

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Sarmiento, Miguel. Sudden Yield Reversals and Financial Intermediation in Emerging Markets. Banco de la República, octobre 2022. http://dx.doi.org/10.32468/be.1210.

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Banks in emerging market economies rely on cross-border interbank lending to financing firms in the real sector. By matching cross-border bank-to-bank loan level data with domestic bank-to-firm loan level data, and firm-level data, this paper shows that sudden yield reversal observed during the 2013 Fed taper tantrum resulted in a substantial contraction of cross-border interbank lending in emerging markets that significantly reduced the supply of domestic corporate credit and increased the corporate loan rates. Results show that firms with an ex-ante high concentration of credit granted by exposed banks in the cross-border interbank market exhibited low bank credit and substantial real effects, including a decline in imports and exports. The results further indicate that cross-border intra-group lending and domestic unsecured interbank funding contribute to smoothing the effects of sudden yield reversals on the financial intermediation. Overall, the results are consistent with the notion that banks’ exposition in international credit markets contributes to global financial conditions’ transmission to the economy.
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