Littérature scientifique sur le sujet « Superdirective array »
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Articles de revues sur le sujet "Superdirective array"
Altshuler, E. E., T. H. O'Donnell, A. D. Yaghjian et S. R. Best. « A monopole superdirective array ». IEEE Transactions on Antennas and Propagation 53, no 8 (août 2005) : 2653–61. http://dx.doi.org/10.1109/tap.2005.851810.
Texte intégralNakamura, Takashi, Shin-Ichi Miyagawa et Senji Yckokawa. « Superdirective cascaded dipole array ». Electronics and Communications in Japan (Part I : Communications) 75, no 11 (1992) : 80–88. http://dx.doi.org/10.1002/ecja.4410751108.
Texte intégralLonsky, Tomas, Jan Kracek et Pavel Hazdra. « Superdirective Linear Dipole Array Optimization ». IEEE Antennas and Wireless Propagation Letters 19, no 6 (juin 2020) : 902–6. http://dx.doi.org/10.1109/lawp.2020.2981533.
Texte intégralBuell, Kevin, Hossein Mosallaei et Kamal Sarabandi. « Metamaterial Insulator Enabled Superdirective Array ». IEEE Transactions on Antennas and Propagation 55, no 4 (avril 2007) : 1074–85. http://dx.doi.org/10.1109/tap.2007.893373.
Texte intégralHaskou, Abdullah, Ala Sharaiha et Sylvain Collardey. « Compact Antenna Array of Superdirective Elements ». IEEE Antennas and Wireless Propagation Letters 15 (2016) : 1386–89. http://dx.doi.org/10.1109/lawp.2015.2510382.
Texte intégralBest, S. R., E. E. Altshuler, A. D. Yaghjian, J. M. McGinthy et T. H. O'Donnell. « An Impedance-Matched 2-Element Superdirective Array ». IEEE Antennas and Wireless Propagation Letters 7 (2008) : 302–5. http://dx.doi.org/10.1109/lawp.2008.921372.
Texte intégralSimón Gálvez, Marcos F., Stephen J. Elliott et Jordan Cheer. « A superdirective array of phase shift sources ». Journal of the Acoustical Society of America 132, no 2 (août 2012) : 746–56. http://dx.doi.org/10.1121/1.4733556.
Texte intégralAndrasic, G., et J. R. James. « Height reduced superdirective array with helical directors ». Electronics Letters 29, no 23 (1993) : 2002. http://dx.doi.org/10.1049/el:19931335.
Texte intégralBokhari, S. A., H. K. Smith, J. R. Mosig, J. F. Zürcher et F. E. Gardiol. « Superdirective antenna array of printed parasitic elements ». Electronics Letters 28, no 14 (1992) : 1332. http://dx.doi.org/10.1049/el:19920846.
Texte intégralGreco, Danilo, et Andrea Trucco. « Superdirective Robust Algorithms’ Comparison for Linear Arrays ». Acoustics 2, no 3 (22 septembre 2020) : 707–18. http://dx.doi.org/10.3390/acoustics2030038.
Texte intégralThèses sur le sujet "Superdirective array"
Baktir, Yasemin. « Investigation Of Superdirective Antenna Arrays ». Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12611038/index.pdf.
Texte intégralNelakonda, Nikitha. « Design of Robust Superdirective Receiving Antenna Array for Circular, Hexagonal and Elliptical Geometries ». University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1460984746.
Texte intégralTouhami, Abdellah. « Optimisation multi-objectif d'antennes superdirectives compactes à balayage de faisceau pour des passerelles domestiques 5G sans fil ». Electronic Thesis or Diss., Université de Rennes (2023-....), 2024. http://www.theses.fr/2024URENS002.
Texte intégralThe evolution of wireless communication impose the need for more sophisticated antenna architectures, combined with antenna diversity and beamforming techniques. This type of antenna offers new possibilities for wireless applications in terms of spectral efficiency, radio link reliability, reduced environmental impact and increased communications system capacity. However, conventional beamforming techniques often lead to a significant increase in antenna size. As a result, the integration of such systems into small wireless devices is relatively limited. Compact, superdirective antenna arrays offer an innovative and attractive solution for both beamforming needs and integration in small volumes. However, they exhibits multiple drawbacks, including low radiation efficiency, low gain and narrow bandwidth. These drawbacks limit the usefulness of superdirective arrays to meet the needs of new-generation wireless technologies. In this thesis, we propose new multi-objectives optimization methods, based on network characteristic mode theory (NCM), array factor theory as well as artificial neural networks (ANN), for the design and the development of new compact, superdirective, efficient and wideband antenna architectures for 5G applications
Diao, Junming. « High-Sensitivity Phased Arrays for Radio Astronomy and Satellite Communications ». BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6546.
Texte intégralMoore, Darren C. « Speech enhancement using microphone arrays ». Thesis, Queensland University of Technology, 2000. https://eprints.qut.edu.au/36141/1/36141_Moore_2000.pdf.
Texte intégralDebard, Alexandre. « Analyse et optimisation d'antennes réseaux compactes superdirectives ». Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALT058.
Texte intégralThe purpose of this thesis is to study and seek improvement of the superdirective antenna array technology. This technology has been recently re-examined in the literature since it can bring some interesting functionalities in the future telecommunication applications. The examination of this type of antenna is thus conducted through the use of Spherical Wave Expansion which allows for the general study of directivity limits as well as gain limits, considering lossy antennas. The classical theory of end-fire array antennas is also reviewed, in the case of uniformly spaced tapered arrays, providing theoretical evaluation of efficiency and sensitivity to source feeding precision.Infinitesimal dipoles and Huygens sources are considered in a proposed development that links array theory and Spherical Wave Expansion. This contribution provides a formal proof for the directivity limit of Huygens-source-based end-fire arrays as well as an upper bound for the directivity of dipole-based arrays, when the inter-element spacing tends to zero. Moreover, it is shown how classical array theory can also be used to derive excitation coefficients that maximize gain rather than directivity, when loss resistances are considered. An examination over antenna size is also made to demonstrate which conditions are most favorable for the use of such supergain or superdirective end-fire array optimization.In a second part, practical implementations of superdirective antennas are surveyed, focusing on Huygens sources and compact end-fire array designs. The chosen implementation architecture of parasitic element arrays is then detailed and studied, in order to minimize the requirement for negative or positive resistive loads. This lead to the design and measurement of five prototypes that aim at achieving the maximum possible gain or directivity for a limited radiator size, with two-, three- and four-dipole end-fire arrays
Wakasa, Masahiro. « Lower bounds on the Q-factor for small oversampled superdirective arrays over a ground plane ». Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-188960.
Texte intégralNästa generations basstationsantenner för kommunikationsnätverk förväntas hantera flera frekvensband och en metod för detta är att de har stor bandbredd, de förväntas också stödja funktionalitet för multi-beam tillämpningar. Gruppantenner är en möjlig kandidat som både kan erbjuda hög riktverkan hos fjärrfältet, och som har multi-beam kapacitet och möjligheter till vidvinkelscanning. Sådana bredbandiga gruppantenner blir elektriskt små i deras lågfrekvensgräns, och detta ger flera utmaningar på deras funktionalitet för låga frekvenser. Sådana utmaningar är bland annat att få hög riktverkan i deras fjärrfält vid de låga frekvenserna. Strömmar på en elektriskt liten antenn som genererar hög direktivitet (riktverkan) har liten bandbredd, dvs strömmen på den givna geometrin måste förändras mycket som funktion av frekvensen för att bibehålla hög direktiviteten. Q-faktorn är ett mått på förhållandet mellan den upplagrade energin genom den utstrålade effekten. Den år också omvänt proportionell mot den relativa bandbredden när Q ≫ 1. I denna avhandling undersöker vi sambandet mellan Q-faktorn och diriktiviteten hos två konfigurationer av gruppantennelement framförallt med avseende på superdirektiva gruppantenner. Utifrån en existerande experimentell gruppantenn designad för basstationsapplikationer med start frän 700 MHz upp till 4.2 GHz skapar vi två ideala modeller dar vi antar att gruppantennens element är placerad över ett oändligt jordplan. Vi beräknar den lägsta Q-faktorn för den givna geometrin och given direktivitet vid 745 MHz, vilket är mittfrekvensen för GSM 700 MHz-banden med hjälp av konvex optimering. Här använder vi CVX som den konvexa optimeringsverktyg, som är integrerad med MATLAB. Uttrycken av den upplagrade energin och utstrålad effekt formuleras i en matrisform med hjälp av Metod Moment (MoM) uttryckt med Rao-Wilton-Gilson (RWG) basfunktioner. Denna matris-baserade representation av storheterna blir input till en konvex optimering. Vi best¨ammer en relation mellan direktivitet och Q-faktorn, för dessa geometrier. Detta kan formuleras om som bandbredden vi lågfrekvensgränsen hos gruppantennen.
Tumolo, Roberto Michele. « Design, analysis, application and experimental assessment of algorithms for the synthesis of maximally sparse, planar, non-superdirective and steerable arrays ». Doctoral thesis, Università degli studi di Trento, 2018. https://hdl.handle.net/11572/367635.
Texte intégralTumolo, Roberto Michele. « Design, analysis, application and experimental assessment of algorithms for the synthesis of maximally sparse, planar, non-superdirective and steerable arrays ». Doctoral thesis, University of Trento, 2018. http://eprints-phd.biblio.unitn.it/3438/2/Disclaimer_Tumiolo.pdf.
Texte intégralWang, Chun-kai, et 王俊凱. « Superdirective microphone array with application in nearfield acoustical holography and supersensitive sound pickup ». Thesis, 2011. http://ndltd.ncl.edu.tw/handle/78727869214292849640.
Texte intégral國立交通大學
機械工程學系
99
There are two topics in this thesis: one is supersensitive sound pickup and the other is super directive microphone array with application in nearfield acoustic holography. The former contains horn and curved array, and we will discuss the theory, design method and the result. Final, the device is applied to the application in a distant recording. Conventional nearfield acoustical holography (NAH) is generally based on the free-field assumption, which can cause errors when interfering sources are present in practical environment. Although the measurement of particle velocity as the input to NAH provides certain advantage, the noise problem of finite difference estimation of particle velocity can nullify the velocity-based reconstruction that is better conditioned than the pressure-based process. Alternatively, this paper examines the feasibility of using directional sensors in each channel of the microphone array such that the robustness of inverse reconstruction is enhanced against reflections from boundaries. With two microphones in each channel, the directivity of each array element is tailored according to various design criteria of first-order differential microphones. Directivity index, front-to-back ratio and constant beam-width are employed as the objective functions for optimizing array filters. The proposed methods are utilized in an Equivalent Source Model (ESM)-based NAH. The proposed techniques are verified by numerical simulations and experiments, with interfering source positioned at various directions. Sound field is reconstructed using the pressure input and the particle velocity estimated by the finite difference method.
Livres sur le sujet "Superdirective array"
Active Impedance Matching for Superdirective, Super-Gain HTS Antenna Arrays. Storming Media, 1996.
Trouver le texte intégralChapitres de livres sur le sujet "Superdirective array"
Khouma, Mamadou Mansour, Ibra Dioum, Idy Diop, Lamine Sane, Kadidiatou Diallo et Samuel Ouya. « A Superdirective and Reconfigurable Array Antennas for Internet of Vehicles (IoV) ». Dans Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 3–11. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-16042-5_1.
Texte intégralBitzer, Joerg, et K. Uwe Simmer. « Superdirective Microphone Arrays ». Dans Digital Signal Processing, 19–38. Berlin, Heidelberg : Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-04619-7_2.
Texte intégralBenesty, Jacob, Jingdong Chen et Israel Cohen. « Superdirective Beamforming with Circular Arrays ». Dans Springer Topics in Signal Processing, 91–111. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-14842-7_6.
Texte intégralActes de conférences sur le sujet "Superdirective array"
YuKang Liu. « Phase modes circular array superdirective beamforming ». Dans OCEANS 2012. IEEE, 2012. http://dx.doi.org/10.1109/oceans.2012.6405024.
Texte intégralGupta, Monish, et Jyoti Saxena. « Superdirective patch antenna array using metamaterial ». Dans 2014 IEEE International Conference on Electronics, Computing and Communication Technologies (CONECCT). IEEE, 2014. http://dx.doi.org/10.1109/conecct.2014.6740320.
Texte intégralHaskou, Abdullah, Sylvain Collardey et Ala Sharaiha. « Small array design using parasitic superdirective antennas ». Dans 2016 10th European Conference on Antennas and Propagation (EuCAP). IEEE, 2016. http://dx.doi.org/10.1109/eucap.2016.7481848.
Texte intégralHaskou, Abdullah, Sylvain Collardey et Ala Sharaiha. « Small 3D array design using superdirective antennas ». Dans 2015 Loughborough Antennas & Propagation Conference (LAPC). IEEE, 2015. http://dx.doi.org/10.1109/lapc.2015.7366122.
Texte intégralDakhli, Saber, Hatem Rmili, Jean-Marie Floc'h, Fethi Choubani et Muntasir Sheikh. « Design of superdirective and compact antenna array ». Dans 2016 5th International Conference on Multimedia Computing and Systems (ICMCS). IEEE, 2016. http://dx.doi.org/10.1109/icmcs.2016.7905543.
Texte intégralDebard, Alexandre, Antonio Clemente, Christophe Delaveaud, Christopher Djoma, Patrick Potier et Philippe Pouliguen. « Analytical evaluation of superdirective array sensitivity factor ». Dans 2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2017. http://dx.doi.org/10.1109/apusncursinrsm.2017.8072223.
Texte intégralMazinani, S. Maryam, et Hamid Reza Hassani. « Two element wideband Planar plate Monopole superdirective array ». Dans 2010 18th Iranian Conference on Electrical Engineering (ICEE). IEEE, 2010. http://dx.doi.org/10.1109/iraniancee.2010.5507521.
Texte intégralJaafar, H., S. Collardey et A. Sharaiha. « Internally Loaded Endfire Superdirective Array for Wideband Performance ». Dans 12th European Conference on Antennas and Propagation (EuCAP 2018). Institution of Engineering and Technology, 2018. http://dx.doi.org/10.1049/cp.2018.1019.
Texte intégralGuo, Xijing, Shie Yang et Hu Zhang. « A low-frequency superdirective acoustic vector sensor array ». Dans ICASSP 2015 - 2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP). IEEE, 2015. http://dx.doi.org/10.1109/icassp.2015.7178468.
Texte intégralTouhami, Abdellah, Ala Sharaiha et Sylvain Collardey. « Wideband Superdirective Array Antenna with Beam steering capabilities ». Dans XXXVth URSI General Assembly and Scientific Symposium. Gent, Belgium : URSI – International Union of Radio Science, 2023. http://dx.doi.org/10.46620/ursigass.2023.1848.nntq5994.
Texte intégralRapports d'organisations sur le sujet "Superdirective array"
White, D. J., D. R. Bowling et P. L. Overfelt. Active Impedance Matching for Superdirective, Super-Gain HTS Antenna Arrays. Fort Belvoir, VA : Defense Technical Information Center, mars 1996. http://dx.doi.org/10.21236/ada306546.
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