Готові списки джерел за темами / Junction of waveguides

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Добірка наукової літератури з теми "Junction of waveguides"

Автор: Grafiati
Опубліковано: 26 січня 2024

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Статті в журналах з теми "Junction of waveguides"

1

Berdnik, Sergey L., Victor A. Katrich, Mikhail V. Nesterenko, and Yuriy M. Penkin. "Waveguide T-junctions with resonant coupling between sections of different dimensions." International Journal of Microwave and Wireless Technologies 9, no. 5 (November 23, 2016): 1059–65. http://dx.doi.org/10.1017/s175907871600129x.

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Анотація:
Electromagnetic characteristics of the E-plane T-junction for two rectangular waveguides using resonant coupling between the waveguide sections were studied by mathematical modeling. The problem of coupling between infinite and semi-infinite rectangular waveguides through a resonant slot in the end-wall of the semi-infinite waveguide in the presence of resonant monopole is solved in a strict electrodynamic formulation. The monopole with variable surface impedance is placed parallel to the narrow walls at an arbitrary position inside the infinite waveguide. The problem is solved analytically by the generalized method of induced electro-magneto-motive forces. Impedance vibrator inclusions with variable electro-physical parameters have been analyzed as control elements for waveguide junctions. To this purpose energy characteristics of the junction in the single-mode regime of the both waveguides, and also in multi-mode regime of the semi-infinite waveguide is investigated. The results may be useful for development of variety antennas and waveguide devices, which involves waveguide junctions.
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2

Pochernyaev, V. N., and N. M. Syvkova. "EXTERNAL PARAMETERS OF THE CONNECTION OF A RECTANGULAR WAVEGUIDE PARTIALLY FILLED OF LINEAR DIELECTRIC WITH A RECTANGULAR WAVEGUIDE PARTIALLY FILLED OF NONLINEAR DIELECTRIC." Visnyk Universytetu “Ukraina”, no. 1 (28) 2020 (2020): 100–105. http://dx.doi.org/10.36994/2707-4110-2020-1-28-09.

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. In the article, the external parameters of the connection of a rectangular waveguide partially filled of linear dielectric with a rectangular waveguide partially filled of a nonlinear dielectric are determined. Knowledge of the external parameters of such a connection ensures the design of devices with open nonlinear elements. Promising microwave paths of radio engineering systems based on rectangular waveguides partially filled of dielectric include a wide variety of active and passive microwave devices. The plane-transverse junction of these waveguides is considered for various geometric dimensions of dielectric plates and their relative permittivity. Such a junction is characterized by reactive conductivity, which is determined through the sum of the reactive conductivities of local fields. The transverse electric field at the junction is represented through the eigenvector function of the geometric surface, which coincides with the cross section of the waveguides. The scattering matrix of the plane-transverse junction is determined through the conductivity of the sections of the two waveguides and the conductivity of the plane-transverse junction. The dependences of the traveling wave coefficient and the modulus of the reflection coefficient on the geometric dimensions of the dielectric plate are plotted taking into account the local fields generated at the plane transverse junction. At the junction of two waveguides, not only changed the geometric dimensions of the dielectric plates along the wide and narrow walls of the waveguide, but also their relative permittivity. In one case, two higher types of waves were taken into account: quasi - H30 and quasi - H12, in the other case - four higher types of waves: quasi - H30, quasi - H12, quasi - E12, quasi - H50. Calculations show that an increase in the number of higher types of waves has practically no effect on the accuracy of calculations. The results obtained indicate the rapid internal convergence of the obtained solutions and the correct choice of the transverse electric eigenvector function of rectangular waveguides partially filled of dielectric as approximate the field on the junction of two waveguides.
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3

Ishibashi, Akira, Tsuyoshi Kasai, and Nobuo Sawamura. "Redirection Waveguide having Discrete Translational Symmetry for Photovoltaic Systems with Solar-Cell Units Placed at the Periphery." Energies 11, no. 12 (December 14, 2018): 3498. http://dx.doi.org/10.3390/en11123498.

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We have investigated a new type of redirection waveguides for concentration solar-cell systems. The solar cell units are to be placed in the peripheral region of the waveguide. The redirection waveguide converts three-dimensionally propagating (3D) photons into 2D photons that propagate in a planar waveguide which serves as the mainstream of the redirection waveguide. In this new type, the cladding layer on one side of the planar waveguide, not being spatially continuous, tangentially touches the core of the planar waveguide which, having an open geometry, is connected, through tributary waveguides, to the bottom plane where the 3D-photons come in vertically. Based on simulations, we have shown not only that good mainstream-to-mainstream propagation of light-wave can be obtained but also that the light propagation from the tributary waveguides to the mainstream is well done. We also have confirmed that light-waves from the tributary waveguides are well merged with those from the mainstream waveguide at the junction of the cores of the mainstream and the tributary waveguides. Light-waves injected from tributary waveguides propagates well in the core of the mainstream waveguide passing those junctions. The light-wave merging can be fulfilled in the waveguide with the discrete translational symmetry. Photons are shown to be well conveyed in the new waveguide losslessly for a distance of ~1 mm. The redirection waveguide is promising for the concentration photovoltaic systems with solar-cell units placed at its periphery.
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4

Koala, Ratmalgre, Ryoma Maru, Kei Iyoda, Li Yi, Masayuki Fujita, and Tadao Nagatsuma. "Ultra-Low-Loss and Broadband All-Silicon Dielectric Waveguides for WR-1 Band (0.75–1.1 THz) Modules." Photonics 9, no. 8 (July 24, 2022): 515. http://dx.doi.org/10.3390/photonics9080515.

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This study presents ultra-low-loss and broadband all-silicon dielectric waveguides for the WR-1 band (0.75–1.1 THz). The waveguides are built in high-resistivity silicon (10 kΩ-cm) and integrated with supportive frames fabricated from the same silicon wafer in a single etch process to achieve a compact design. We pursued low-loss, broadband, substrateless, unclad and effective medium waveguides. Smaller propagation losses of 0.3 dB/cm and 0.1 dB/cm were achieved for the unclad and effective medium waveguides, respectively. The 3 dB bandwidth was not encountered in the frequency range of interest and was as broad as 350 GHz. An unclad waveguide was employed to devise a Y-junction to demonstrate its practical applications in terahertz imaging. An integrated circuit card was successfully scanned. In addition, we developed unclad waveguide, effective medium waveguide, and Y-junction modules. The modules incorporated an input/output interface compatible with a standard WR-1 flange (254 μm × 127 μm). Unlike the conventional hollow waveguide modules, the unclad waveguide and effective medium waveguide modules reported total loss improvements of 6 dB and 8 dB, respectively, across the operation band. Our results provided a systematic way of achieving low-loss, compact, and versatile modules in the WR-1 band based on all-dielectric-waveguide platforms.
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5

Belubekyan, M. V., and S. L. Sahakyan. "ON THE LOCALIZATION OF SHEAR VIBRATIONS IN A COMPOSITE ELASTIC SEMI-INFINITE FLAT WAVEGUIDE." Proceedings of the YSU A: Physical and Mathematical Sciences 54, no. 1 (251) (April 15, 2020): 44–49. http://dx.doi.org/10.46991/pysu:a/2020.54.1.044.

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Анотація:
In this paper we consider semi-infinite flat waveguides with different boundary conditions on the planes and on the edges that bound the waveguide. The possibility of localizing shear waves in the vicinity of the junction of neighbouring parts of a semi-infinite flat waveguide is established.
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6

D. V. Divakov, K.P. Lovetskiy, A. L. Sevastyanov, and A. A. Tiutiunnik. "Adiabatic guided modes of a three-layer integral optical waveguide." Technical Physics 68, no. 4 (2023): 423. http://dx.doi.org/10.21883/tp.2023.04.55931.292-22.

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Анотація:
The numerical solution of the problem of guided propagation of polarized light in a smooth junction of a planar waveguide is considered. Within the framework of the model of adiabatic guided modes, the system of Maxwell equations is reduced to a system of four ordinary differential equations and two algebraic equations for six components of the electromagnetic field in the zeroth approximation and the same number of equations in the first approximation. The multilayer structure of waveguides makes it possible to reduce the problem to a homogeneous system of linear algebraic equations, whose nontrivial solvability condition yields the dispersion equation. Auxiliary eigenvalue problems for describing the adiabatic modes of the waveguide are solved. Keywords: smoothly irregular integrated-optical multilayer waveguides, eigenvalue and eigenvector problems, single-mode propagation of adiabatic waveguide modes.
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7

Eccleston, Kimberley, and Ian Platt. "Identifying Near-Perfect Tunneling in Discrete Metamaterial Loaded Waveguides." Electronics 8, no. 1 (January 11, 2019): 84. http://dx.doi.org/10.3390/electronics8010084.

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Mu-negative and epsilon-negative loaded waveguides taken on their own are nominally cut-off. In ideal circumstances, and when paired in the correct proportions, tunneling will occur. However, due to losses and constraints imposed by finite-sized constituent elements, the ability to experimentally demonstrate tunneling may be hindered. A tunnel identification method has been developed and demonstrated to reveal tunneling behavior that is otherwise obscured. Using ABCD (voltage-current transmission) matrix formulation, the S-parameters of the mu-negative/epsilon-negative loaded waveguide junction is combined with S-parameters of an epsilon-negative loaded waveguide. The method yields symmetric scattering matrices, which allows the effect of losses to be removed to provide yet clearer identification of tunneling.
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8

Nazarov, S. A., K. Ruotsalainen, and P. Uusitalo. "The Y-junction of quantum waveguides." ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik 94, no. 6 (March 18, 2013): 477–86. http://dx.doi.org/10.1002/zamm.201200255.

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9

KIM, JUN-HYONG, HOE-YOUNG YANG, and HYUN-YONG LEE. "FABRICATION OF MACH-ZEHNDER INTERFEROMETOR BASED ON PLANAR WAVEGUIDE FOR THE APPLICATION OF BIOSENSORS." International Journal of Modern Physics B 23, no. 06n07 (March 20, 2009): 1891–96. http://dx.doi.org/10.1142/s0217979209061792.

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Анотація:
In this paper, designed and simulated Power Splitter (PS) integrated Mach-Zehnder interferometer (MZI) based planar waveguide devices (which is called here a PS-MZI). Moreover, we fabricated optical waveguide based on the PS-MZI for application to the biosensor. The integrated optical structure is sensitive to refractive index change induced due to the interaction of the evanescent field with an immobilized biological sample placed on one of the two arms of the interferometer. The PS-MZI sensor was preceded by a Y -junction, which splits the input power between the sensor and a reference branch to minimize the effect of optical power variations. The waveguide were optimized at a wavelength of 1550 nm and fabricated according to the design rule of 0.45 delta%, which is the difference of refractive index between the core and clad. The fabrication of PS-MZI optical waveguides was performed by a conventional planar lightwave circuit (PLC) fabrication process. The PS-MZI optical waveguides were measured of the optical characteristics for the application of biosensors.
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10

Vu, Ngoc Hai, Thanh Tuan Pham, and Seoyong Shin. "Large Scale Spectral Splitting Concentrator Photovoltaic System Based on Double Flat Waveguides." Energies 13, no. 9 (May 9, 2020): 2360. http://dx.doi.org/10.3390/en13092360.

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In this research, we present a novel design for a large scale spectral splitting concentrator photovoltaic system based on double flat waveguides. The sunlight concentrator consists of a Fresnel lens array and double waveguides. Sunlight is firstly concentrated by Fresnel lenses then reaches an upper flat waveguide (UFW). The dichroic mirror-coated prisms are positioned at each focused area to divide the sunlight spectrum into two bands. The mid-energy (mid E) band is reflected at the prism surface and coupled to the UFW. The GaInP/GaAs dual-junction solar cell is attached at the exit port of the UFW to maximize the electrical conversion efficiency of the mid E band. The low-energy (low E) band is transmitted and reaches a bottom flat waveguide (BFW). The mirror coated prisms are utilized to redirect the mid E band sunlight for coupling with the BFW. The GaInAsP/GaInAs dual-junction solar cell is applied to convert the low E band to electricity. The system was modeled using the commercial optic simulation software LightTools™. The results show that the proposed system can achieve optical efficiencies of 84.02% and 80.01% for the mid E band and low E band, respectively, and a 46.1% electrical conversion efficiency for the total system. The simulation of the system performance and comparison with other PV systems prove that our proposed design is a new approach for a highly efficient photovoltaic system.
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Більше джерел

Дисертації з теми "Junction of waveguides"

1

Chan, Kin Lung. "Modal analysis of elliptic waveguide junctions." Thesis, University of Hull, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389728.

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2

Swee-Ping, Yeo. "Characteristics of the symmetrical five-port waveguide junction." Thesis, University College London (University of London), 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431178.

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3

Kanellopoulos, Vassilios N. "Vectorial finite element analysis of E-plane waveguide junctions." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=64027.

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4

Froncioni, Andy M. "A new finite element method for analysis of H-plane waveguide junctions /." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63937.

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5

Tong, Cheuk-yu. "Développement d'un récepteur millimétrique à base d'une structure diélectrique incorporant une jonction supraconductrice." Grenoble 1, 1988. http://www.theses.fr/1988GRE10138.

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Un nouveau recepteur millimetrique a base d'une combinaison integree: guide d'onde dielectrique non-rayonnant (nrd) modifie, a ete concu et teste aux longueurs d'onde de trois et un millimetre le recepteur comporte une jonction sis (supraconducteur-isolant-supraconducteur) ainsi qu'une structure de couplage originale qui couple l'energie du guide nrd a la jonction
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6

Gérard, Philippe. "Méthode modale généralisée pour l'étude de dispositifs d'optique intégrée : application : filtre microondes par voie optique." Grenoble INPG, 1994. http://www.theses.fr/1994INPG0061.

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Анотація:
Nous proposons une technique numerique originale appelee rsm pour la propagation d'un champ optique dans une structure dielectrique planaire sans pertes et de forme arbitraire. C'est une technique entierement modale dont la base de decomposition des champs est constituee des modes propres locaux guides et rayonnes de la structure. Elle cumule les avantages des diverses bpm mais s'en distingue par le fait qu'elle peut traiter des geometries des guides qui presentent des forts changements de direction, des fortes discontinuites d'indice et des effets de polarisation. Nous demontrons les potentialites de cette methode a l'aide de plusieurs exemples choisis volontairement comme tres demonstratifs des interets de la methode et qui ne peuvent etre correctement traites a l'aide des outils existants. Ce sont: le miroir a reflexion totale et partielle, l'hybridation de photodetecteurs silicium sur un guide realise sur verre cette methode a ete utilisee pour faire une etude systematique des croisements de guides a tous les angles et quelles que soient les conditions de guidage. De plus, nous avons mene une etude des guides courbes realises par echange d'ions sur verre. Ces deux geometries de guides ont ensuite ete utilisees pour la realisation d'un composant d'application. Il s'agit d'un interferometre de mach zehnder asymetrique dont la difference de longueurs entre les deux bras est de 6,6 millimetres. Nous avons demontre que la reponse frequentielle d'un tel dispositif lorsqu'il est eclaire par une lumiere modulee par un signal microondes est celle d'un filtre rejecteur de frequence. Les performances de notre composant sont les suivantes: frequence de rejection 15 ghz, taux de rejection: 15 db optiques et largeur de bande de 700 mhz
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7

Chang, Chun-Huai, and 張峻槐. "Coplanar Waveguide to Slotline T-junction." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/07432188199755276724.

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Анотація:
碩士
國立臺灣大學
電機工程研究所
84
A simple model is proposed for an analysis of the coplanar waveguide to slotline T-junction. By the quasi-TEM assumption, the original inhomogeneous slotline structure containing the dielectric substrate can be replaced by an equivalent homogeneous one. By regarding the strip current of the coplanar waveguide as the fed current of the slotline, one may obtain the governing integral equation for the aperture field over the slot region of slotline. The Hallen's method is then be used to determine the electric field distribution along the slotline from which the input impedance to the T-junction is established. This study carefully examines the return loss to the T-junction where the sloline is terminated by a load impedance. Good agreement between the experiment and the simulation results is observed and ensures the reliability of the model. In this study, the discontinuity effect of the T- junction is investigated theorectically and experimentally.
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8

DENG, SHENG-MING, and 鄧聖明. "Analysis of H-plane tee-junction rectangular waveguide slot coupler." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/57952373253395561222.

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9

Cheng, Li-Chung, and 陳俐君. "A Study on Coplanar Waveguide Highpass Filter with T-Junction Structures." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/05359734964810854420.

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Анотація:
碩士
國立海洋大學
電機工程學系
86
Abstract In the design of highpass filter, the cutoff frequency, the insertion andreturn losses in the passband, and the attenuation slope in the stopband are important parameters to be considered. Moreover, the performances of filters can be improved if the planar structures are used. In this thesis, the conductor- backed coplanar waveguide structures are uesd to design the highpass filter with short circuit stubs and T-junction structures. In this thesis, the theory of the design of highpass filter is analyzed firstly. Next, the symmetrical and asymmetrical coplanar waveguide highpass filters are designed and realized, respectively. Moreover, the effects of T-junction and short-end discontinuity structures are studied and compensatedproperly. Finally, the characteristics of the filters are measured and compared with simulation results.
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10

Wu, Jia-Lun, and 吳嘉倫. "Design of Q-Band Substrate Integrated Waveguide and Microstrip T-junction Diplexer." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/66391834876188057758.

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Анотація:
碩士
國立交通大學
電信工程研究所
104
The design of Q-Band Substrate Integrated Waveguide (SIW) microstrip T-junction diplexer is presented in this thesis. The SIW inductive-post coupled filter was used as channel filter. The microstrip T-junction is used to implement the diplexer. The advantages of mcicrostrip T-junction diplexer are its simple structure, easy to design, and compact size. In order to improve the isolation of the diplexer, a cross-coupled filter is adopted for the low frequency channel filter. The bandwidths and center frequencies of the diplexer are 6%, 38GHz, and 6%, 42GHz. The transmission zero at upper stopband of the cross-coupled channel filter improves the high side isolation of the diplexer. The design difficulty increases as the channel getting closer because the mutual interference of the channel filters gets worse. The circuits are fabricated with two different substrates. One is the Rogers RT- Duroid 5880TM substrate with thickness of 10 mil and dielectric constant of 2.2 and the other is the Rogers RO4350B substrate with thickness of 10 mil and dielectric constant of 3.48. All of the fabricated circuits are connected to 2.4 mm end launch connector and measured by vector network analyzer.
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Книги з теми "Junction of waveguides"

1

Center, Langley Research, ed. Analysis of waveguide junction discontinuities using finite element method: Contract NAS1-19341. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1997.

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2

Helszajn, J. Waveguide junction circulators: Theory and practice. Chichester: Wiley, 1998.

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3

1949-, Simons Rainee, and United States. National Aeronautics and Space Administration., eds. Channelized coplanar waveguide: Discontinuities, junctions, and propogation characteristics. [Washington, DC]: National Aeronautics and Space Administration, 1989.

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4

N, Simons R., and Lewis Research Center, eds. Channelized coplanar waveguide pin-diode switches. Cleveland, Ohio: Lewis Research Center, 1989.

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5

Law, P. H. A hybrid asymptotic-modal analysis of the EM scattering by an open-ended S-shaped rectangular waveguide cavity. Columbus, Ohio: Ohio State Uniersity, ElectroScience Laboratory, Dept. of Electrical Engineering, 1989.

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6

Law, P. H. A hybrid asymptotic-modal analysis of the EM scattering by an open-ended S-shaped rectangular waveguide cavity. Columbus, Ohio: Ohio State Uniersity, ElectroScience Laboratory, Dept. of Electrical Engineering, 1989.

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7

Negative Group Delay Devices: From Concepts to Applications. Institution of Engineering & Technology, 2018.

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Частини книг з теми "Junction of waveguides"

1

Nesterenko, Mikhail V., Victor A. Katrich, Yuriy M. Penkin, and Sergey L. Berdnik. "Stepped Junction of the Two Rectangular Waveguides with the Impedance Slotted Iris." In Analytical and Hybrid Methods in the Theory of Slot-Hole Coupling of Electrodynamic Volumes, 1–24. New York, NY: Springer New York, 2008. http://dx.doi.org/10.1007/978-0-387-76362-0_6.

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2

Burns, W. K., and A. F. Milton. "Waveguide Transitions and Junctions." In Springer Series in Electronics and Photonics, 89–144. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-97074-0_3.

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3

Burns, W. K., and A. F. Milton. "Waveguide Transitions and Junctions." In Springer Series in Electronics and Photonics, 89–144. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-75824-9_3.

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4

Eom, Hyo J. "Junctions in Parallel-Plate/Rectangular Waveguide." In Wave Scattering Theory, 121–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59487-8_5.

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5

Roukes, M. L., T. J. Thornton, A. Scherer, J. A. Simmons, B. P. Van der Gaag, and E. D. Beebe. "Electron Waveguide Junctions: Scattering from a Microfabrication-Imposed Potential." In Science and Engineering of One- and Zero-Dimensional Semiconductors, 71–82. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-5733-9_9.

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6

Nesterenko, Mikhail V., Victor A. Katrich, Yuriy M. Penkin, Sergey L. Berdnik, and Oleksandr M. Dumin. "T-Junctions of Rectangular Waveguides with Vibrator-Slot Structures in Coupling Areas." In Lecture Notes in Electrical Engineering, 157–89. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60177-5_5.

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7

Tsuru, Koji, Kazunori Miyahara, and Minoru Suzuki. "Millimeter wave response of Josephson junction arrays using a waveguide to microstrip line converter." In Advances in Superconductivity VIII, 1171–74. Tokyo: Springer Japan, 1996. http://dx.doi.org/10.1007/978-4-431-66871-8_264.

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8

Olyslager, Frank. "Fields Incident On Bitransmission Lines." In Electromagnetic Waveguides and Transmission Lines, 187–95. Oxford University PressOxford, 1999. http://dx.doi.org/10.1093/oso/9780198564508.003.0007.

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Abstract In this chapter, the results of the previous chapter are generalized to general bianisotropic waveguides and junctions. The main difference is that for nonreciprocal waveguides and junctions the ad joint structures are also needed in order to apply the Lorentz reciprocity theorem. It will, however, suffice to know the eigenmodes that propagate in the ad joint waveguide and to know the fields generated in ad joint junctions by incident eigenmodes from adjoint waveguides connected to these junctions. The representation of incident fields by voltage and current sources in the reciprocity-based bitransmission lines of Chapter 5 is straightforward.
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9

Olyslager, Frank. "Fields Incident On Transmission Lines." In Electromagnetic Waveguides and Transmission Lines, 162–86. Oxford University PressOxford, 1999. http://dx.doi.org/10.1093/oso/9780198564508.003.0006.

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Abstract The previous chapters have investigated the propagation of eigenmodes in wave guides and their transmission line representation without considering the excitation of these eigenmodes.45 In this chapter, the excitation of eigenmodes will be studied in detail. The analysis starts with the determination of the eigenmodes excited in a waveguide by external electric and magnetic current densities. This is a generic excitation problem that can be used in many practical situations. The fields generated by these sources will also illuminate junctions of waveguides. This will result in the excitation of eigenmodes in the waveguides connected to these junctions.
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10

Levy, Ralph. "Waveguide Junctions." In Encyclopedia of RF and Microwave Engineering. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2005. http://dx.doi.org/10.1002/0471654507.eme489.

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Тези доповідей конференцій з теми "Junction of waveguides"

1

Deng, Jau-Jan, and Yang-Tung Huang. "A Novel Hybrid Coupler Based on Antiresonant Reflecting Optical Waveguides." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/cleo_europe.1996.cthi44.

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The beam splitter and the beam combiner are key elements for optical communications, and the optical-waveguide hybrid coupler has been proposed for these functions by Izutsu, et al. [1]. This conventional waveguide hybrid coupler consists of symmetric and nonsymmetric Y-junctions connected directly. In each Y-junction, there are two types of normal modes, even and odd modes, traveling along the propagation direction. For the input symmetric Y-junction, the amplitudes of the field for both modes in two individual waveguides are the same; in the output nonsymmetric Y-junction, the fields of the even and odd modes are mainly confined in the wide- and narrow-arm, respectively. The input conditions will determine the outputs of the wide- and narrow-arm in the nonsymmetric Y-junction. In this presentation, we present a novel hybrid coupler structure based on antiresonant reflecting optical waveguides (ARROWs) to provide the same functions.
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2

Subramanian, P., P. K. A. Wai, C. R. Menyuk, and R. J. Hawkins. "Effect of junction rounding on the propagation characteristics of Y-junction waveguides." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.tuii1.

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The beam propagation method1 is used to stimulate the propagation of light through Y junctions. Such structures have been extensively studied in the past, but the effect of junction rounding on the propagation characteristics has not been considered before. For photolithographically patterned, dry etched Y junctions, junction rounding usually leads to the branching point of the junction being 1–20 μm away from the position where it would have been if it were sharp. This work describes the effect of junction rounding on the propagation characteristics of symmetric and asymmetric Y junctions. The total power in each arm and the power in the fundamental mode is plotted as a function of propagation distance for different junction angles, input field distributions, and extents of junction rounding. We find that junction rounding has a surprisingly small effect on the propagation characteristics, so that it will have almost no detrimental impact on the experiments.
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3

Kapon, Eli, and R. N. Thurston. "Multimode branching waveguides for guided-wave optics." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1987. http://dx.doi.org/10.1364/oam.1987.mb4.

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Waveguide junctions are important for performing splitting and recombining of optical signals for guided-wave optics applications.1 We describe a new class of multichannel waveguide junction which is useful for a variety of guided-wave manipulations. These junctions consist of an m-mode channel waveguide that branches into m single-mode channels, each having a different refractive-index profile. It is shown that each mode of these junctions becomes localized in a different single-mode channel as the channel separation increases. Thus, for sufficiently small branching angles, the junctions can route each mode of the multimode waveguide into a different output channel. When the junctions are excited from their single-mode channels end, they can serve to excite selectively each mode of the multimode waveguide. Furthermore, when both the width and refractive index of the single-mode channels are properly varied across the junction, the mode localization scheme becomes wavelength-dependent. Hence such junctions can operate as wavelength multiplexers/demultiplexers. Finally, by dynamically varying the refractive-index steps of the junction channels, e.g., via the electrooptic effect or optical nonlinearities, the waveguide junctions can perform multiport switching, modulation, and dynamic wavelength multiplexing/demultiplexing of guided waves.
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4

Chi, Sien, and Tian-Tsorng Shi. "TE waves propagating in a nonlinear planar asymmetric converging waveguide Y junction." In Nonlinear Guided-Wave Phenomena. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/nlgwp.1991.me4.

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Recently nonlinear waveguide junctions have been investigated intensively for their interesting switching behaviors1,2. The waves propagating in a nonlinear converging waveguide Y junction in which the two branches and the stem are single mode waveguides are less reported. For a linear case, the field injected into the thinner branch at a distance from the junction will not evolve into the fundamental mode of the stem, and the field injected into the thicker branch will propagate without loss3. Here we simulate the waves propagating in the Y junction with a nonlinear cladding by using beam propagation method4, and we find that the field injected into the thinner branch is possible to transmit to the stem with a high efficiency.
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5

Chu, F. S., P. L. Liu, S. L. Jia, and P. J. Cressman. "Simulation and experimental study of Ti:LiNbO3 waveguides." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.thy27.

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A waveguide-simulation program based on the beam-propagation method has been used to study Ti-indiffused LiNbO3 waveguide structures. By modifying the double-moded branching structure of the conventional Y-junction design, the loss of the branching structure can be substantially reduced. For a 1° half-branching angle, the loss can be lowered from –1.2 dB to 0.2 dB. Experimental data confirm that the modified design indeed has a lower loss. In addition to the branching structure, waveguide bends are also needed to complete a Y-junction. Low-loss coherent coupling bends are simulated and measured. From the measured mode profile, the waveguide simulation program is used to obtain the diffusion parameters for the Y-cut, X- or Z-propagating waveguides. The coupling lengths of directional couplers fabricated on such substrates are calculated and compared with experimental measurements. Coupling between adjacent waveguide bends is simulated. Mismatched waveguides, as well as ion milling, are used to decouple adjacent waveguides. Results of simulation are compared with experimental data.
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6

Vawter, G. Allen, James L. Merz, and Larry A. Coldren. "Monolithically Integrated Transverse Junction Stripe Lasers with Rib Waveguides in GaAs/AlGaAs." In Integrated and Guided Wave Optics. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/igwo.1988.wb4.

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Complete integration of optical laser sources and waveguides with electronics on a single semiconductor wafer has been a long sought after and elusive goal. Future development of optoelectronic integrated circuits (OEICs) hinges on the development of monolithically integrated laser/waveguide systems with low threshold currents and high injection efficiency into the passive waveguide. This paper reports progress in developing just such a high efficiency Transverse Junction Stripe1 (TJS) laser source integrated with an external passive waveguide suitable for optical interconnection applications. Threshold current as low as 60 mA and injection efficiencies as high as 40% are reported.
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7

Carle, Pierluigi. "Right-Angle Junction for Rectangular Waveguides." In 21st European Microwave Conference, 1991. IEEE, 1991. http://dx.doi.org/10.1109/euma.1991.336385.

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8

Doldissen, W., R. J. Deri, R. J. Hawkins, R. Bhat, J. B. D. Soole, L. M. Schiavone, M. Seto, N. Andreadakis, Y. Silberberg, and M. A. Koza. "Efficient vertical coupling of photodiodes to InGaAsP rib waveguides." In Integrated Photonics Research. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/ipr.1991.thf7.

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Monolithic optoelectronics requires optical linkage between waveguides and photodiodes. Vertical coupling offers the advantages of single-step epi-growth and ease of junction placement.1,2 Its drawback is weak coupling, resulting in long detector lengths L and high capacitance. thinner guides can reduce L,1,2 but increase input coupling difficulty. We recently demonstrated than an optical "matching layer' introduced between a thick n-/n^+ InP waveguide and an InGaAs absorber significantly enhances vertical coupling.3 Here we show that this approach provides efficient coupling between InGaAs detectors and InGaAsP waveguides of the type currently employed in photonic integration.
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9

Constantinou, Constantinos C., and Raymund C. Jones. "Tapered graded-index waveguide analysis using path integrals." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.thpp6.

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In many fiber and integrated optical devices one needs either to connect two waveguides of different cross-sections, or to join several waveguides at a single junction. A knowledge of the coupling efficiencies of such a junction is clearly important and depends on our understanding of propagation in tapered waveguide sections. We consider paraxial propagation in the z-direction in a graded index waveguide whose refractive index is given by By suitably choosing the function c(z) we can describe tapers with linear, hyperbolic or parabolic geometries in the xz plane. We have used the Feynman Path integral method1 to obtain exact expressions for the coupling efficiency of such tapers without resorting to approximate numerical techniques. Our closed form analytical results for the coupling efficiencies reveal detailed structure which other methods of analysis do not show. Some recent experimental evidence would indicate support for the results of our calculations.2
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10

Wakayama, Y., T. Kita, and H. Yamada. "Low loss junction of Si-wire waveguides and silica based waveguides for a hybrid waveguide photonic integrated circuit." In 2010 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2010. http://dx.doi.org/10.7567/ssdm.2010.p-7-21.

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Звіти організацій з теми "Junction of waveguides"

1

Tau, Cyrus N. Waveguide Junction Analysis Involving Asymmetrical Modes. Fort Belvoir, VA: Defense Technical Information Center, September 1986. http://dx.doi.org/10.21236/ada178464.

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