Academic literature on the topic 'Antena ESPAR'
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Journal articles on the topic "Antena ESPAR"
Rahmania, Rissa, Bambang Setia Nugroho, Fiky Yosef Suratman, and Suryo Adhi Wibowo. "GA-MIMO: Genetic Algorithm for Optimization of ESPAR Antenna on Beamspace MIMO." Jetri : Jurnal Ilmiah Teknik Elektro 17, no. 1 (August 16, 2019): 1. http://dx.doi.org/10.25105/jetri.v17i1.4520.
Full textJunwei Lu, D. Ireland, and R. Schlub. "Dielectric embedded ESPAR (DE-ESPAR) antenna array for wireless communications." IEEE Transactions on Antennas and Propagation 53, no. 8 (August 2005): 2437–43. http://dx.doi.org/10.1109/tap.2005.852517.
Full textKeum, Hong-Sik, Changyoung An, and Heung-Gyoon Ryu. "Design of ESPAR Antenna using Patch Antenna and Performance Analysis of MIMO Communications." Journal of Korea Information and Communications Society 39A, no. 10 (October 31, 2014): 579–84. http://dx.doi.org/10.7840/kics.2014.39a.10.579.
Full textMovahedinia, Reza, Mohammad Reza Chaharmir, Abdel R. Sebak, Mohammad Ranjbar Nikkhah, and Ahmed A. Kishk. "Realization of Large Dielectric Resonator Antenna ESPAR." IEEE Transactions on Antennas and Propagation 65, no. 7 (July 2017): 3744–49. http://dx.doi.org/10.1109/tap.2017.2705024.
Full textRzymowski, M., P. Woznica, and L. Kulas. "Single-Anchor Indoor Localization Using ESPAR Antenna." IEEE Antennas and Wireless Propagation Letters 15 (2016): 1183–86. http://dx.doi.org/10.1109/lawp.2015.2498950.
Full textAn, Changyoung, Seung Hwan Lee, and Heung-Gyoon Ryu. "Beam Diversity Receiver Using 7-Element ESPAR Antenna." Journal of Korea Information and Communications Society 39A, no. 1 (January 31, 2014): 36–42. http://dx.doi.org/10.7840/kics.2014.39a.1.36.
Full textLee, Jun-Hyun, Jun-Yeong Bok, and Heung-Gyoon Ryu. "Chaos QPSK Modulated Beamspace MIMO System Using ESPAR Antenna." Journal of Korean Institute of Communications and Information Sciences 39A, no. 2 (February 28, 2014): 77–85. http://dx.doi.org/10.7840/kics.2014.39a.2.77.
Full textHan, Q., K. Inagaki, B. Hanna, and T. Ohira. "Evanescent Reactive-Near-Field Measurement for ESPAR Antenna Characterization." IEEE Transactions on Antennas and Propagation 54, no. 10 (October 2006): 2953–62. http://dx.doi.org/10.1109/tap.2006.882155.
Full textMarantis, Leonidas, Dimitrios Rongas, Anastasios Paraskevopoulos, Christos Oikonomopoulos‐Zachos, and Athanasios Kanatas. "Pattern reconfigurable ESPAR antenna for vehicle‐to‐vehicle communications." IET Microwaves, Antennas & Propagation 12, no. 3 (January 11, 2018): 280–86. http://dx.doi.org/10.1049/iet-map.2017.0209.
Full textChoi, Se-Ah, Seung-Hwan Lee, and Hak-Keun Choi. "Design of the ESPAR antenna with improved DC bias." Microwave and Optical Technology Letters 57, no. 10 (July 29, 2015): 2281–86. http://dx.doi.org/10.1002/mop.29318.
Full textDissertations / Theses on the topic "Antena ESPAR"
Nelson, Paul Jeffrey. "Varactor-based reactive network design for ESPAR phased array and antenna applications." Honors in the Major Thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/1120.
Full textBachelors
Engineering and Computer Science
Electrical Engineering
Bucheli, Garcia Juan. "Electromagnetic aspects of ESPAR and digitally controllable scatterers with a look at low-complexity algorithm design." Electronic Thesis or Diss., Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAT004.
Full textThe thesis focuses on the idea of exploiting the spatial domain (as opposed to the exploitation of the time-frequency resource) of wireless environments from two fronts: a) ESPAR antennas (standing for Electronically Steerable Parasitic Array Radiator) as a potential inexpensive alternative to conventional multi-antenna architectures (inexpensive in relation to the number of radio frequency front-ends these conventional architectures are often assumed to be provided with), and b) the study of reactively loaded arrays to deliver controllable scattering as a mean of adding degrees of freedom to the propagation environment itself. The latter is achieved here via digitally controllable scatterers (DCS).Particularly, the thesis focuses on the goal of better conditioning optimization problems as means of proposing low-complexity algorithms. Therefore, one key aspect is the required balance between the accuracy and complexity of the adopted electromagnetic models.Thus, it is appropriate to highlight the importance given to the interface between electromagnetism and the signal characterization. More specifically, both ESPAR and DCS require the understanding of electromagnetic (EM) phenomena that is not fully accounted for through conventional link-level descriptions. More importantly, the latter is proof of the need to join the approaches of two related research communities to cope with the scarcity of resources that is only expected to grow in the decades to come. In fact, the document is mostly positioned from the view of someone with a background in telecommunications (unlike pure electromagnetism) with looks at enlightening the underlying EM mechanisms. It is roughly composed of three parts, namely: fundamentals, the ESPAR antenna and digitally controllable scatterers. In fact, the aim of having one part of the document dedicated purely to fundamentals is to describe the EM phenomena while highlighting all relevant details to the remaining two.The part "fundamentals" begins with Maxwell's equations (and their convenient solution for far-field radiation problems) all the way to the well-known (y=hx+n) signal characterization. As the seemingly least appropriate description to work with, but most complete characterization of the EM phenomena, Maxwell's equations are the basis that link our mathematical description to the very same reality. Thus, the objective of this part is to expose the connection between fields and signals, as well as to open the door to questioning the conventional transmitter-receiver signal model. The latter becomes one of the most exciting outcomes of this project in line with the research-related aim of challenging our vision to expand our understanding of a problem.To continue, the second part is dedicated to the ESPAR antenna as a preamble of what is meant by "questioning the conventional transmitter-receiver signal model". Particularly, ESPAR obliges us to depart from the abstract signal space in which traditional multi-antenna link-level characterizations are depicted. As a contribution of this work, it will be shown how a local approximation of the system model offers an alternative view. Notably, through such an approximation of the system model, a computationally-efficient solution to the non-trivial problem of channel-based adaptation of the radiation characteristics of ESPAR is found.Last, but not least, the third part deals with digitally controllable scatterers as a mean of improving energy efficiency. Such an exciting concept has gained significant attention in the recent years and, in a sense, opens the door to a radically different way to conceive communication problems. Even though these devices are in their infancy, it is not difficult for me to imagine how the decades to come could be marked by the massification of this technology
Silva, André Alves. "Modificação das caraterísticas de radiação de uma antena usando componentes eletrónicos." Master's thesis, 2015. http://hdl.handle.net/10400.26/19511.
Full textOver the past few decades, the increased technological growth has played a key role in the development of military forces in the world. The Portuguese Army also assimilated these technological advances and incorporated them in their activities, leading to a revolution in the modus operandi of the Armed Forces, designated by Revolution in Military Affairs. In the last few years, the Portuguese Army has developed two robots to perform surveillance and reconnaissance tasks, in several theaters of operations. The wireless communications with these robots need an antenna that should be robust, small sized, and which allows to vary the main lobe’s direction and width. Thus, an antenna designated by Electronically Steerable Parasitic Array Radiator (ESPAR) was dimensioned and simulated through the technique of genetic algorithms, which project is the main objective of this Master's Thesis. This antenna will allow the operator to have a directional antenna, enabling him to choose the direction in which the emission has a maximum gain. Varying the antenna’s mutual impedances changes the relation between the excitation currents, which in turn vary the direction and bandwidth of the main lobe, allowing to obtain different radiation patterns. The antenna was simulated and dimensioned in 4NEC2X program, to operate in the 2.4GHz band. After that, a matching circuit and a ground plane that optimized the antenna characteristics were designed. The ESPAR antenna, by its final characteristics, it complies with the necessary requisites to achieve communication with the robots, in the Portuguese Army theaters of operations.
Ruano, Edgar Manuel Branco. "Estudo comparativo de duas antenas para transmissão sem fios em 2,4 GHz." Master's thesis, 2016. http://hdl.handle.net/10400.26/17819.
Full textThe need for antennas for communication with unmanned systems used by the military to perform surveillance tasks and recognition tasks led to the development of this work. This dissertation has the objective to design and build a prototype of an antenna, which is able to perform wireless communication between the operator and unmanned systems. The work was focused on the optimization and practical use of an ESPAR (Eletronically Steerable Passive Arrays Radiators) antenna, using the technique of genetic algorithms. This antenna allows a directional radiation pattern which can be switched in azimuth. Initially the antenna has been designed and simulated in 4NEC2X simulation program, to operate in the band of 2,4 GHz. The construction of a prototype involved also the construction of a basic structure and the inclusion of electronic components. After construction, the antenna was tested in an anechoic chamber and performed measurements of radiation patterns and the 𝑆11 parameter were performed. The measurement results confirmed the characteristics of directive radiation and the switch of the radiation pattern in azimuth, which is in accordance with the performed simulations. At the end realizes the comparison of ESPAR antenna built as part of this work, with a printed Yagi-Uda, whose prototype was carried out in a previous master's thesis.
Marques, Pedro Miguel Martins. "Antenas de comunicações UAV’s." Master's thesis, 2016. http://hdl.handle.net/10400.26/17801.
Full textThe Portuguese Air Force is developing a project entitled "Project for Research and Technology in Unmanned Aerial Vehicles" (PIVANT) with the aim of providing the Portuguese Air Force with the ability of exploitation of these unmanned aerial vehicles. Some UAV have already been developed performing reconnaissance and surveillance missions over continental and maritime Portuguese territory. The need to communicate or improve communication with these platforms, led to the propose of this dissertation, whose goal is to design a planar type antenna of the type Electronically Steerable Parasitic Array Radiator (P-ESPAR) at the operating of frequency 1.33 GHz which will improve the efficiency and scope of the downlink between the UAV and the ground station, besides allowing the variation of the main lobe in azimuth, giving the operator the ability to choose the direction of communication. The state of the art in is described order to know the evolution until now of the antennas used in UAVs. At a later stage the characteristics of planar antennas, methods of excitation and analysis methods needed for the design of the antenna will be presented. The analysis and development of the P-ESPAR antenna begins with the design and simulation in CST Microwave Studio program of single patch element. The development of the P-ESPAR antenna will follow, describing the elements that compose it.
Bembe, Mncedisi Jacob. "Structural parameter based design and optimisation for dual-band ESPAR antenna system." Thesis, 2012. http://hdl.handle.net/10210/4524.
Full textThis work considers a dual band electronically steerable parasitic array radiator (ESPAR) antenna system. This system is designed with one actively fed radiating element and N-parasitic radiating elements. The radiation pattern can be electronically controlled by means of the loads terminating the parasitic elements. The antenna system is designed as ESPAR to have a minimum number of controlling elements thereby minimising the power consumed. The dual band operation of this antenna is for the frequency bands of the wireless local area network (WLAN), which are 2.412-2.482 GHz for IEEE 802.11b/g (known as the 2.4 GHz band) and 5.15-5.825 GHz for IEEE 802.11a (known as the 5 GHz band). In the upper band, only the 5.8 GHz sub-band was considered. The dual-band capability was targeted by conducting a structural parameter modification on the antenna system. The structural modification involves optimisation of the length of the active element, the length of the parasitic element, the distance of the parasitic element from the active element and most importantly, by application of a loading technique on the elements. The loading was done by using optimisation tools, such as fminsearch, fminbnd and the genetic algorithm. The specific circuit that was used for the loading was a series connection inductors inserted into the antenna’s elements at positions found via a global optimization.. The method used was to first identify the optimal length per specific resonant frequency and consider the optimal length with respect to both resonant frequencies. The second step was to load the three resulting optimised different monopoles, and the loading with results closest to the requirements. The optimum monopole of the three in the second step was then used as the fixed input parameter for the main optimisation of ESPAR antenna. Using a ground plane with a skirt, an acceptable return loss performance has been achieved for the antenna's main building M.J. Bembe ii block, a monopole element, in both frequency bands. The challenge was found in steering of the beam in different directions; it was then concluded that the usage of more elements could provide the necessary freedom for the optimisation process. Six elements were arranged symmetrically close to the active fed element in order to achieve a dual band resonance, with different designs meeting the requirements differently. This is the first report showing an ESPAR antenna optimisation which includes the loading of elements with lengths and distance optimisation.
Berger, Jonathan Michael. "Low Cost Direction Finding with the Electronically Steerable Parasitic Array Radiator (ESPAR) Antenna." Thesis, 2006. http://hdl.handle.net/10539/1499.
Full textIn this paper, the Electronically Steerable Parasitic Array Radiator (ESPAR) antenna, developed by the Advanced Telecommunications Research Institute (ATR) in Japan was analyzed to determine its feasibility as a low cost direction finding (DF) system. Simulations of the antenna were performed in SuperNEC and Matlab was used to determine the direction of arrival (DOA) using the Reactance Domain multiple signal classification (MUSIC) algorithm. Results show the ideal configuration has 6 parasitic elements with a diameter of 0.5 . Up to 5 periodic, uncorrelated signals spread 360° in azimuth and above 45° elevation produce sharp peaks in the MUSIC spectra. Azimuth separations of only 2° at 40 dB are resolvable while signals arriving with 25% full power are still detectable. For the DOA to be resolved the radiation pattern should be asymmetrical and hence the reactance set should have a range of unequal values. Comparative results show that the 6 element ESPAR offers excellent overall performance despite the reduction in cost and is comparable in performance to the 6 element uniform linear array.
Zhou, Yu. "Performance Evaluation of Pattern Reconfigurable Antennas in MIMO Systems." Thesis, 2012. http://hdl.handle.net/1807/32644.
Full textBooks on the topic "Antena ESPAR"
Calderón Calvo, Claudia, Marta Ruiz-Narezo, Nerea Iglesias-López, and Manuel González de Audikana de la Hera. Desigualdades de género en materia de drogas ¿cómo afecta realmente el alcoholismo a las mujeres? University of Deusto, 2020. http://dx.doi.org/10.18543/dsib-4(2020)-pp89-114.pdf.
Full textMartins, Maria do Rosário Rodrigues, Eduardo Medeiros, M. L. Rodrigues de Areia, and Maria Arminda Miranda. Moçambique. Aspectos da Cultura Material. Imprensa da Universidade de Coimbra, 2019. http://dx.doi.org/10.14195/978-989-26-1910-1.
Full textSilva, Álvaro Ferreira da. Transtorno mental de professores da rede municipal de educação em Palmas TO, 2008 a 2011, e a possível relação com o trabalho. Editora Dialética, 2020. http://dx.doi.org/10.48021/978-65-5877-279-8.
Full textLópez López, Andrés Felipe, Olga L. Larre Angélica, María Rodríguez Ortiz, Juan Camilo Hernández Rodríguez, César Augusto Guerra Villa, Danny A. J. Gómez Ramírez, Juan Pablo Cardona Buitrago, et al. Logos y filosofía. Temas y debates contemporáneos. Universidad San Buenaventura, 2020. http://dx.doi.org/10.21500/9789588474953.
Full textPino Posada, Juan Pablo. Aurelio Arturo y la poesía colombiana del siglo XX. Editorial EAFIT, 2020. http://dx.doi.org/10.17230/9789587207064lr0.
Full textMunares Sánchez, Gabriela. Brecha digital y género en la Comunitat Valenciana : informe 2020. Cátedra de Brecha Digital y Género - Universitat de València, 2020. http://dx.doi.org/10.7203/10550/79227.
Full textSepúlveda, Jovanny. Luces y sombras de la constitucionalizacion en la justicia. CUA - Medellin, 2018. http://dx.doi.org/10.52441/der201806.
Full textOliveira, Mário Cézar Amorim de, Nilson de Souza Cardoso, and Jaqueline Rabelo de Lima. Itinerários de resistência: pluralidade e laicidade no Ensino de Ciências e Biologia. Editora Realize, 2021. http://dx.doi.org/10.46943/viii.enebio.2021.01.000.
Full textAlves de Araújo, Raimundo, and Joaquim dos Santos. Nas trilhas do sertão: escritos de cultura e política nos interiores do Ceará – volume 6. Editora SertãoCult, 2021. http://dx.doi.org/10.35260/87429915-2021.
Full textBook chapters on the topic "Antena ESPAR"
Shimizu, Takayuki, Hisato Iwai, and Hideichi Sasaoka. "Information Reconciliation Using Reliability in Secret Key Agreement Scheme with ESPAR Antenna." In Security and Privacy in Mobile Information and Communication Systems, 148–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-04434-2_13.
Full textMisu, Kazuki, and Jun Miura. "Specific Person Detection and Tracking by a Mobile Robot Using 3D LIDAR and ESPAR Antenna." In Intelligent Autonomous Systems 13, 705–19. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-08338-4_51.
Full textBembe, Mncedisi J., Willem Clarke, and Albert A. Lysko. "A Structural Parameter Based Modification of Energy Conscious ESPAR Antenna System through Optimization for WLAN’s Dual-Band Operability." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 22–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23828-4_3.
Full textTaillefer, Eddy, Jun Cheng, and Takashi Ohira. "Direction of Arrival Estimation with Compact Array Antennas." In Handbook on Advancements in Smart Antenna Technologies for Wireless Networks, 201–16. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-59904-988-5.ch010.
Full textHashimoto, Toru, and Tomoyuki Aono. "Key Generation System Using Smart Antenna." In Handbook on Advancements in Smart Antenna Technologies for Wireless Networks, 425–48. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-59904-988-5.ch020.
Full textCheng, Jun, Eddy Taillefer, and Takashi Ohira. "Omni-, Sector, and Adaptive Modes of Compact Array Antenna." In Handbook on Advancements in Smart Antenna Technologies for Wireless Networks, 532–44. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-59904-988-5.ch025.
Full textCheng, Jun, Eddy Taillefer, and Takashi Ohira. "Omni-, Sector, and Adaptive Modes of Compact Array Antenna." In Networking and Telecommunications, 716–28. IGI Global, 2010. http://dx.doi.org/10.4018/978-1-60566-986-1.ch045.
Full textWatanabe, Masahiro, Sadao Obana, and Takashi Watanabe. "Ad Hoc Networks Testbed Using a Practice Smart Antenna with IEEE802.15.4 Wireless Modules." In Handbook on Advancements in Smart Antenna Technologies for Wireless Networks, 500–512. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-59904-988-5.ch023.
Full textWatanabe, Masahiro, Sadao Obana, and Takashi Watanabe. "Ad Hoc Networks Testbed Using a Practice Smart Antenna with IEEE802.15.4 Wireless Modules." In Networking and Telecommunications, 1581–94. IGI Global, 2010. http://dx.doi.org/10.4018/978-1-60566-986-1.ch102.
Full text"Algo Debe de Estar Pasando Con Mis Antenas / Something Must Be Happening to My Antennas." In In Case of Fire in a Foreign Land, 118–21. Duke University Press, 2002. http://dx.doi.org/10.1215/9780822383956-033.
Full textConference papers on the topic "Antena ESPAR"
Abdullah, N., and Y. Kuwahara. "A study of ESPAR antenna." In 2010 International Conference on Microwave and Millimeter Wave Technology (ICMMT). IEEE, 2010. http://dx.doi.org/10.1109/icmmt.2010.5525159.
Full textMovahedinia, R., M. R. Chaharmir, M. Akbari, A. Sebak, and A. A. Kishk. "A large ESPAR with dielectric resonator subarrays." In 2016 17th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM). IEEE, 2016. http://dx.doi.org/10.1109/antem.2016.7550161.
Full textAlshami, Bashir, Hassan Aboulnour, and Mohamad Dib. "Design of a broadband ESPAR antenna." In 2009 Mediterranean Microwave Symposium (MMS). IEEE, 2009. http://dx.doi.org/10.1109/mms.2009.5409767.
Full textZhou, Lin, Fahd Ahmed Khan, and Tharmalingam Ratnarajah. "Arbitrary signal transmission using an ESPAR antenna." In 2015 IEEE International Conference on Signal Processing for Communications (ICC). IEEE, 2015. http://dx.doi.org/10.1109/icc.2015.7249102.
Full textMarantis, Leonidas, Anastasios Paraskevopoulos, Dimitrios Rongas, Athanasios Kanatas, Christos Oikonomopoulos-Zachos, and Sebastian Voell. "A printed monopole ESPAR antenna for Truck-to-Truck communications." In 2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT). IEEE, 2017. http://dx.doi.org/10.1109/iwat.2017.7915368.
Full textAstawa, I. Gede Puja, Yoedy Moegiharto, Hendy Briantoro, Ahmad Zainudin, Novita Astin, and Minoru Okada. "ESPAR antenna based diversity scheme for multiple antenna OFDM system." In 2015 International Electronics Symposium (IES). IEEE, 2015. http://dx.doi.org/10.1109/elecsym.2015.7380839.
Full textKausar, Ahmed, Shafaq Kausar, and Hani Mehrpouyan. "Gain Optimization of a Seven Element ESPAR Antenna." In 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting. IEEE, 2019. http://dx.doi.org/10.1109/apusncursinrsm.2019.8888473.
Full textHuang, An-Min, Qun Wan, Xin-Xin Chen, and Wan-Lin Yang. "Enhanced Reactance-Domain ESPRIT Method for ESPAR Antenna." In TENCON 2006 - 2006 IEEE Region 10 Conference. IEEE, 2006. http://dx.doi.org/10.1109/tencon.2006.344036.
Full textPlapous, Cyril, Jun Cheng, Eddy Taillefer, Akifumi Hirata, and Takashi Ohira. "Reactance Domain MUSIC Algorithm for ESPAR Antennas." In 33rd European Microwave Conference, 2003. IEEE, 2003. http://dx.doi.org/10.1109/euma.2003.341072.
Full textPlapous, C., J. Cheng, E. Taillefer, A. Hirata, and T. Ohira. "Reactance domain MUSIC algorithm for ESPAR antennas." In 33rd European Microwave Conference Proceedings. IEEE, 2003. http://dx.doi.org/10.1109/eumc.2003.177595.
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