Literatura académica sobre el tema "Superdirective array"
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Artículos de revistas sobre el tema "Superdirective array"
Altshuler, E. E., T. H. O'Donnell, A. D. Yaghjian y S. R. Best. "A monopole superdirective array". IEEE Transactions on Antennas and Propagation 53, n.º 8 (agosto de 2005): 2653–61. http://dx.doi.org/10.1109/tap.2005.851810.
Texto completoNakamura, Takashi, Shin-Ichi Miyagawa y Senji Yckokawa. "Superdirective cascaded dipole array". Electronics and Communications in Japan (Part I: Communications) 75, n.º 11 (1992): 80–88. http://dx.doi.org/10.1002/ecja.4410751108.
Texto completoLonsky, Tomas, Jan Kracek y Pavel Hazdra. "Superdirective Linear Dipole Array Optimization". IEEE Antennas and Wireless Propagation Letters 19, n.º 6 (junio de 2020): 902–6. http://dx.doi.org/10.1109/lawp.2020.2981533.
Texto completoBuell, Kevin, Hossein Mosallaei y Kamal Sarabandi. "Metamaterial Insulator Enabled Superdirective Array". IEEE Transactions on Antennas and Propagation 55, n.º 4 (abril de 2007): 1074–85. http://dx.doi.org/10.1109/tap.2007.893373.
Texto completoHaskou, Abdullah, Ala Sharaiha y 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.
Texto completoBest, S. R., E. E. Altshuler, A. D. Yaghjian, J. M. McGinthy y 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.
Texto completoSimón Gálvez, Marcos F., Stephen J. Elliott y Jordan Cheer. "A superdirective array of phase shift sources". Journal of the Acoustical Society of America 132, n.º 2 (agosto de 2012): 746–56. http://dx.doi.org/10.1121/1.4733556.
Texto completoAndrasic, G. y J. R. James. "Height reduced superdirective array with helical directors". Electronics Letters 29, n.º 23 (1993): 2002. http://dx.doi.org/10.1049/el:19931335.
Texto completoBokhari, S. A., H. K. Smith, J. R. Mosig, J. F. Zürcher y F. E. Gardiol. "Superdirective antenna array of printed parasitic elements". Electronics Letters 28, n.º 14 (1992): 1332. http://dx.doi.org/10.1049/el:19920846.
Texto completoGreco, Danilo y Andrea Trucco. "Superdirective Robust Algorithms’ Comparison for Linear Arrays". Acoustics 2, n.º 3 (22 de septiembre de 2020): 707–18. http://dx.doi.org/10.3390/acoustics2030038.
Texto completoTesis sobre el tema "Superdirective array"
Baktir, Yasemin. "Investigation Of Superdirective Antenna Arrays". Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12611038/index.pdf.
Texto completoNelakonda, 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.
Texto completoTouhami, 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.
Texto completoThe 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.
Texto completoMoore, Darren C. "Speech enhancement using microphone arrays". Thesis, Queensland University of Technology, 2000. https://eprints.qut.edu.au/36141/1/36141_Moore_2000.pdf.
Texto completoDebard, Alexandre. "Analyse et optimisation d'antennes réseaux compactes superdirectives". Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALT058.
Texto completoThe 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.
Texto completoNästa 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.
Texto completoTumolo, 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.
Texto completoWang, Chun-kai y 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.
Texto completo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.
Libros sobre el tema "Superdirective array"
Active Impedance Matching for Superdirective, Super-Gain HTS Antenna Arrays. Storming Media, 1996.
Buscar texto completoCapítulos de libros sobre el tema "Superdirective array"
Khouma, Mamadou Mansour, Ibra Dioum, Idy Diop, Lamine Sane, Kadidiatou Diallo y Samuel Ouya. "A Superdirective and Reconfigurable Array Antennas for Internet of Vehicles (IoV)". En 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.
Texto completoBitzer, Joerg y K. Uwe Simmer. "Superdirective Microphone Arrays". En Digital Signal Processing, 19–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-04619-7_2.
Texto completoBenesty, Jacob, Jingdong Chen y Israel Cohen. "Superdirective Beamforming with Circular Arrays". En Springer Topics in Signal Processing, 91–111. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-14842-7_6.
Texto completoActas de conferencias sobre el tema "Superdirective array"
YuKang Liu. "Phase modes circular array superdirective beamforming". En OCEANS 2012. IEEE, 2012. http://dx.doi.org/10.1109/oceans.2012.6405024.
Texto completoGupta, Monish y Jyoti Saxena. "Superdirective patch antenna array using metamaterial". En 2014 IEEE International Conference on Electronics, Computing and Communication Technologies (CONECCT). IEEE, 2014. http://dx.doi.org/10.1109/conecct.2014.6740320.
Texto completoHaskou, Abdullah, Sylvain Collardey y Ala Sharaiha. "Small array design using parasitic superdirective antennas". En 2016 10th European Conference on Antennas and Propagation (EuCAP). IEEE, 2016. http://dx.doi.org/10.1109/eucap.2016.7481848.
Texto completoHaskou, Abdullah, Sylvain Collardey y Ala Sharaiha. "Small 3D array design using superdirective antennas". En 2015 Loughborough Antennas & Propagation Conference (LAPC). IEEE, 2015. http://dx.doi.org/10.1109/lapc.2015.7366122.
Texto completoDakhli, Saber, Hatem Rmili, Jean-Marie Floc'h, Fethi Choubani y Muntasir Sheikh. "Design of superdirective and compact antenna array". En 2016 5th International Conference on Multimedia Computing and Systems (ICMCS). IEEE, 2016. http://dx.doi.org/10.1109/icmcs.2016.7905543.
Texto completoDebard, Alexandre, Antonio Clemente, Christophe Delaveaud, Christopher Djoma, Patrick Potier y Philippe Pouliguen. "Analytical evaluation of superdirective array sensitivity factor". En 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.
Texto completoMazinani, S. Maryam y Hamid Reza Hassani. "Two element wideband Planar plate Monopole superdirective array". En 2010 18th Iranian Conference on Electrical Engineering (ICEE). IEEE, 2010. http://dx.doi.org/10.1109/iraniancee.2010.5507521.
Texto completoJaafar, H., S. Collardey y A. Sharaiha. "Internally Loaded Endfire Superdirective Array for Wideband Performance". En 12th European Conference on Antennas and Propagation (EuCAP 2018). Institution of Engineering and Technology, 2018. http://dx.doi.org/10.1049/cp.2018.1019.
Texto completoGuo, Xijing, Shie Yang y Hu Zhang. "A low-frequency superdirective acoustic vector sensor array". En ICASSP 2015 - 2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP). IEEE, 2015. http://dx.doi.org/10.1109/icassp.2015.7178468.
Texto completoTouhami, Abdellah, Ala Sharaiha y Sylvain Collardey. "Wideband Superdirective Array Antenna with Beam steering capabilities". En 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.
Texto completoInformes sobre el tema "Superdirective array"
White, D. J., D. R. Bowling y P. L. Overfelt. Active Impedance Matching for Superdirective, Super-Gain HTS Antenna Arrays. Fort Belvoir, VA: Defense Technical Information Center, marzo de 1996. http://dx.doi.org/10.21236/ada306546.
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