Articles de revues : « Smart Antenna System »

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Yang, Lingsheng, Peijie Wang, Biyu Cheng et Jianping Fang. « Design of Hybrid Antenna System for User Terminal Applications ». Frequenz 72, n^o 9-10 (28 août 2018) : 407–14. http://dx.doi.org/10.1515/freq-2017-0197.

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Abstract An eight-element hybrid Smart antenna-MIMO system for user terminal application is proposed in this paper. The hybrid antenna system is based on an eight elements antenna array. When operate with respective feed ports, by using radiation pattern diversity, more than 15 dB isolation among antenna elements can be achieved. After designing the feed networks based on maximum power transmission optimization between the transmit and receive antennas, beam steering performance can be obtained, the eight elements work together as a smart antenna array. The hybrid system has both the advantages of MIMO and smart antenna, and is competitive for future wireless communication applications.

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T. G., Shivapanchakshari, et H. S. Aravinda. « PSO-CCO_MIMO-SA : A particle swarm optimization based channel capacity optimzation for MIMO system incorporated with smart antenna ». International Journal of Electrical and Computer Engineering (IJECE) 10, n^o 6 (1 décembre 2020) : 6276. http://dx.doi.org/10.11591/ijece.v10i6.pp6276-6282.

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With the radio channels physical limits, achieving higher data rate in the multi-channel systems is been a biggest concern. Hence, various spatial domain techniques have been introduced by incorporating array of antenna elements (i.e., smart antenna) in recent past for the channel limit expansion in mobile communication antennas. These smart antennas help to yield the improved array gain or bearm forming gain and hence by power efficiency enhanmaent in the channel and antenna range expansion. The use of smart antenna leads to spatial diversity and minimizes the fading effect and improves link reliability. However, in the process of antenna design, the proper channel modelling is is biggest concern which affect the wireless system performance. The recent works of MIMO design systems have discussed the issues in number of antenna selection which suggests that optimization of MIMO channel capacity is required. Hence, a Particle Swarm Optimization based channel capacity optimzation for MIMO system incorporated with smart antenna is introduced in this paper. From the outcomes it is been found that the proposed PSO based MIMO system achieves better convergenece speed which results in better channel capacity.

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M. R. S. Neelima, M. R. S. Neelima, A. Haritha A. Haritha, A. Sudha Madhuri, K. Devanam priya, K. Sandhya K. Sandhya et Dr Ch Santhi Rani Dr. Ch. Santhi Rani. « Smart Antenna for Wcdma FDD Downlink System ». Indian Journal of Applied Research 3, n^o 2 (1 octobre 2011) : 128–30. http://dx.doi.org/10.15373/2249555x/feb2013/44.

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M. Africa, Aaron Don, Rica Rizabel M. Tagabuhin et Jan Jayson S. D. Tirados. « Design and simulation of an adaptive beam smart antenna using MATLAB ». Indonesian Journal of Electrical Engineering and Computer Science 21, n^o 3 (10 mars 2021) : 1584. http://dx.doi.org/10.11591/ijeecs.v21.i3.pp1584-1593.

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Signals transmitted over a long range of distance may pass through several obstacles and scatter, taking multiple paths to reach the receiver. Beamforming antennas are controlled electronically to adjust the radiation pattern following the first received signal. This allows the antenna to maximize the received signal and consequently, suppress the interfering signals received. A smart antenna should be able to diminish noise, increase the signal to noise ratio, and have better system competence. The adaptive beam makes use of the spacing of the several antennas and the phase of the signal of each antenna array to control the shape and direction of the signal beam. This paper focuses on the use of smart antennas using an adaptive beam method as a better system for the transmission of signals. A simulation between the existing Omnidirectional antenna system and the smart antenna system will be made and compared. The paper will discuss the corresponding advantages that a smart antenna system has compared to the Omnidirectional antenna system.

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Kulhari, Sandeep Kumar, et Om Prakash. « Algorithms for Smart Antenna for Digital Communication System ». International Journal of Trend in Scientific Research and Development Volume-2, Issue-3 (30 avril 2018) : 2358–61. http://dx.doi.org/10.31142/ijtsrd12785.

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Saragih, Yuliarman, Ibrahim et Agatha Elisabet. « Study of Smart Antenna Wide Band Multi Beam by Algorithm Switch Beam ». Journal of Sustainable Engineering : Proceedings Series 1, n^o 2 (4 octobre 2019) : 247–57. http://dx.doi.org/10.35793/joseps.v1i2.37.

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The use of wideband antennas in radio frequency (RF) systems are intended to improve the efficiency of the system economically. So that problems arise due to differences in RF system frequency allocation in each country can be overcome. Other than that, the need for an antenna that can optimize the direction of the beam becomes one which became a consideration, for that to develop a smart antenna that is capable of producing the different beam. In various studies, wideband antennas have been built only able to work on a single beam. Meanwhile, the antenna has also been proven to be working in multi-beam but still works on a single frequency. The researcher intends to develop an antenna that can work as a smart antenna that applies multi-beam with switching algorithms by having a wide working frequency (wideband). Multi-beam with wideband can be produced by combining wideband antenna array with a Butler matrix that applies the switching beam algorithm with phase array technique so that it can be a smart antenna because the antenna can be adjusted of the beam as desired.

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Zhang, Zufan, Jie Zhang et Shaohui Sun. « Model of Handover and Traffic Based on Cellular Geometry with Smart Antenna ». International Journal of Antennas and Propagation 2014 (2014) : 1–8. http://dx.doi.org/10.1155/2014/646053.

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Based on the application of smart antennas in cellular mobile communications, this paper introduces the impact of the width of the antenna beams playing on the dwell time probability density function in cellular geometry with smart antenna. The research results indicate that the smart cell structure can improve the dwell time of users within the cell and improve the traffic system performance.

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Chen, Yuan Yuan, Run Jie Liu, Jin Yuan Shen et Dan Dan He. « The Use of Adaptive Algorithms on Smart Antenna Device ». Advanced Materials Research 548 (juillet 2012) : 730–34. http://dx.doi.org/10.4028/www.scientific.net/amr.548.730.

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Adaptive beamforming is one of the core technology of the smart antenna system. Two different adaptive algorithms which adopt the minimum mean square algorithm (LMS) and recursive least squares algorithm (RLS) are employed to realize the beamforming in smart antenna system. The smart antenna system based on LMS and RLS is simulated and realized by the MATLAB software in which a uniform linear adaptive antenna array is used. The results show that the smart antenna systems based on RLS and LMS algorithms can significantly reduce the bit error rate especially with the low SNR.

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Chung, Ming-An, Cheng-Wei Hsiao, Chih-Wei Yang et Bing-Ruei Chuang. « 4 × 4 MIMO Antenna System for Smart Eyewear in Wi-Fi 5G and Wi-Fi 6e Wireless Communication Applications ». Electronics 10, n^o 23 (26 novembre 2021) : 2936. http://dx.doi.org/10.3390/electronics10232936.

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This paper proposes a small-slot antenna system (50 mm × 9 mm × 2.7 mm) for 4 × 4 multiple-input multiple-output (MIMO) on smart glasses devices. The antenna is set on the plastic temple, and the inverted F antenna radiates through the slot in the ground plane of the sputtered copper layer outside the temple. Two symmetrical antennas and slots on the same temple and series capacitive elements enhance the isolation between the two antenna ports. When both temples are equipped with the proposed antennas, 4 × 4 MIMO transmission can be achieved. The antenna substrate is made of polycarbonate (PC), and its thickness is 2.7 mm εr=2.85, tanδ=0.0092. According to the actual measurement results, this antenna has two working frequency bands when the reflection coefficient is lower than −10dB, its working frequency bandwidth at 4.58–5.72 GHz and 6.38–7.0 GHz. The proposed antenna has a peak gain of 4.3 dBi and antenna efficiency of 85.69% at 5.14 GHz. In addition, it also can obtain a peak gain of 3.3 dBi and antenna efficiency of 82.78% at 6.8 GHz. The measurement results show that this antenna has good performance, allowing future smart eyewear devices to be applied to Wi-Fi 5G (5.18–5.85 GHz) and Wi-Fi 6e (5.925–7.125 GHz).

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Levy, Mounissamy, Sumanta Bose, D. Sriram Kumar et Anh Van Dinh. « Rapid Beam Forming in Smart Antennas Using Smart-Fractal Concepts Employing Combinational Approach Algorithms ». International Journal of Antennas and Propagation 2012 (2012) : 1–10. http://dx.doi.org/10.1155/2012/467492.

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Smart antennas offer a broad range of ways to improve wireless system performance. They provide enhanced coverage through range extension, hole filling, and better building penetration. Smart antennas use an array of low gain antenna elements which are connected by a network. Fractal concepts have been used in antenna arrays recently. The important properties of fractal arrays are frequency independent multiband characteristics, schemes for realizing low side lobe designs, systematic approaches to thinning, and the ability to develop rapid beam forming algorithms. In this paper, an attempt has been made to apply assignment of usage time and location tag algorithm for smart antennas combined with the fractal concepts to reduce the computational complexity and enhance resource allocation for rapid beam forming algorithms. Furthermore, two combinational approach algorithms are proposed for peer users within single base station and peer users between different base stations.

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Chien-Hsiang Wu, Chien-Hsiang Wu, et Chin-Feng Lai Chien-Hsiang Wu. « Data-driven Diversity Antenna Selection for MIMO Communication using Machine Learning ». 網際網路技術學刊 23, n^o 1 (janvier 2022) : 001–9. http://dx.doi.org/10.53106/160792642022012301001.

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With the popularity of wireless application environments, smart antenna technology has completely changed the communication system. In order to improve the quality of wireless transmission, smart antennas have been widely used in wireless devices. Wireless signal modeling and prediction machine learning gradually replaced the traditional smart antenna selection method in the antenna selection solution. This article utilizes mobile devices to adjust the diversity antenna pattern for test verification in a MIMO wireless communication environment. The proposed method manipulates signal parameters through error vector magnitude (EVM) and adds data-driven training data. The results show that the SVM and NN methods proposed in this paper are 10.5% and 14% higher than the traditional EVM calculation methods, respectively. Thereby, realize precise antenna adjustment of mobile devices and improving wireless transmission quality.

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Zhou, Li, et Ming Hou. « Research and Analysis about Array Antennas in Mobile Communications ». Advanced Materials Research 760-762 (septembre 2013) : 628–33. http://dx.doi.org/10.4028/www.scientific.net/amr.760-762.628.

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Because the direction of a single antenna is limited, and for strengthening the direct radiant ability of the antenna, we will put the weaker direction antennas together in some way to constitute an antenna array system. The antenna array is also called the array antenna or a disperse antenna array. The antenna cell can be the symmetry center-fed dipole, the aperture antenna, the circle antenna or other forms of the antennas whose direction are limited. In practice, the antenna array is almost constituted of similar antenna cells. I have mainly completed the antenna array direction diagram in conditions of some kinds of parameters. And at last, I get the useful results for practice. This also provides theories basis for the analysis of smart antenna.

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Qasim, Aseel Abdul-Karim, Adheed Hassan Sallomi et ِAli Khalid Jassim. « Rabid Euclidean direction search algorithm for various adaptive array geometries ». Bulletin of Electrical Engineering and Informatics 10, n^o 2 (1 avril 2021) : 856–69. http://dx.doi.org/10.11591/eei.v10i2.1899.

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One of the exciting technologies used to meet the increasing demand for wireless communication services is a smart antenna. A smart antenna is basically confirmed by an array of antennas and a digital beamformer unit through which cellular base station can direct the beam toward the desired user and set nulls toward interfering users. In this paper, different array configurations (linear, circular, and planer) with the REDS algorithm are implemented in the digital beam-forming unit. The wireless system performance is investigated to check the smart antenna potentials assuming Rayleigh fading channel environment beside the AWGN channel. Results show how the REDS algorithm offers a significant improvement through antenna radiation pattern optimization, sidelobe level, and interference reduction, and also the RDES algorithm proves fast convergence with minimum MSE and better sidelobe level reduction comparing with other algorithms.

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Li, Yuan, Li An Bian et Jia Go. « Analysis and Simulation of Mobile Terminal Dual-Unit Smart Antenna ». Applied Mechanics and Materials 195-196 (août 2012) : 673–77. http://dx.doi.org/10.4028/www.scientific.net/amm.195-196.673.

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In this paper, we set up the model of downlink for Time Division synchronous Code Division Multiple Access (TD-SCDMA), and present link level simulation to TD-SCDMA mobile terminal smart antenna system. By carrying on performance simulation in system bit error rate between dual-unit antenna and single-unit antenna, we can validate the advantage of dual-unit smart antenna. Besides, we analysis the mobile terminal smart antenna may influenced by many factors, such as distance of two antenna, moving speed, the number of multi-path and user and so on, solve the contradiction between miniaturization of mobile terminal smart antenna and independence between antenna, and provide a valuable design reference to commercialize the limited frequency spectrum resource.

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Carneiro, António, João Torres, António Baptista et Maria Martins. « Smart Antenna for Application in UAVs ». Information 9, n^o 12 (18 décembre 2018) : 328. http://dx.doi.org/10.3390/info9120328.

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In the present paper, a smart planar electrically steerable passive array radiator (ESPAR) antenna was developed and tested at the frequency of 1.33 GHz with the main goal to control the main radiation lobe direction, ensuring precise communication between the antenna that is implemented in an unmanned aerial vehicle (UAV) and the base station. A control system was also developed and integrated into the communication system: an antenna coupled to the control system. The control system consists of an Arduino, a digital potentiometer, and an improved algorithm that allows defining the radiation-lobe direction as a function of the UAV flight needs. The ESPAR antenna was tested in an anechoic chamber with the control system coupled to it so that all previously established requirements were validated.

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Suh, Minyoung, Katherine E. Carroll, Edward Grant et William Oxenham. « Investigation into the feasibility of inductively coupled antenna for use in smart clothing ». International Journal of Clothing Science and Technology 26, n^o 1 (25 février 2014) : 25–37. http://dx.doi.org/10.1108/ijcst-10-2012-0064.

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Purpose – This research investigated the feasibility of using an inductively coupled antenna as the basis of applying a systems approach to smart clothing. In order to simulate real-life situations, the impact of the distortions and relative displacement of different fabric layers (with affixed antennas) on the signal quality was assessed. The paper aims to discuss these issues. Design/methodology/approach – A spiral antenna was printed on different fabric substrates. Obstructive conditions of the inductively coupled fabric layers were investigated to find out how much influence these conditions had on transmission performance. Reflected signals and transmitted signals were observed, while fabric antennas were subjected to displacement (distance and dislocation) or deformation (stretching and bending). The threshold of physical obstacles was estimated based on statistical analyses. Findings – The limits of physical conditions that enable proper wireless transmission were estimated up to ∼2 cm for both distance and dislocation, and ∼0.24 K for bending deformation. The antenna performance remained within an acceptable level of 20 percent transmission up to 10 percent fabric stretch. Based on well-established performance metrics used in clothing environment on the body, which employs 2-5 cm of ease, the results imply that the inductively coupled antennas may be suitable for use in smart clothing. Originality/value – This research demonstrates that the use of inductively coupled antennas on multiple clothing layers could offer the basis of a new “wireless” system approach to smart clothing. This would not only result in performance benefits, but would also significantly improve the aesthetics of smart clothing which should result in new markets for such products.

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Li, Peng. « An Improved Adaptive Array Algorithm for Terminals of TD-SCDMA System ». Applied Mechanics and Materials 443 (octobre 2013) : 368–73. http://dx.doi.org/10.4028/www.scientific.net/amm.443.368.

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The multi-access interference and quality of communication system can be greatly improved by beam forming technology when the smart antenna is adopted. This paper investigates the performance improvement given by a multi-antenna receiver on a mobile terminal , and a link level simulation scheme is presented based on TD-SCDMA system. The performance of dual smart antenna under different circumstance is analyzed, and three different adaptive algorithms are compared under the specifically modeled multipath fading channel. The simulation results show that a dual-antenna arrangement on a mobile terminal can achieve better performance than a conventional single antenna.

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Jiang, Xiaoyan. « Software design of the smart antenna in the connectivity infotainment system ». Modern Physics Letters B 32, n^o 34n36 (30 décembre 2018) : 1840102. http://dx.doi.org/10.1142/s0217984918401024.

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This paper designs a smart antenna system for the connective vehicle infotainment. It provides a whole software solution for the Vehicle Head Unit independent with OS system. It includes worldwide analog and digital radio and TV, full radio stacks, FM to DAB on web radio seamlessly, vehicle networking management. This paper is to define the interface between the smart antenna module and the Head Unit. The physical link between the smart antenna and the Head Unit is Ethernet, the interface is based on several protocols based on IP protocol such as UPnP, HTTP to receive a radio signal and use it. Thanks to the open source structures and integrating all the radio stacks, this system is much easier for OEM vehicle companies and Tier one suppliers to adopt the smart antenna into the infotainment Head Unit. It saves them a lot of developing time and cost.

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Rashid, Zhwan Mohammed, et Asaad M. Jassim Al-Hindawi. « Design of Adaptive Planar Microstrip Patch Array Operating at 28 GHz for 5G Smart Mobile System ». Kurdistan Journal of Applied Research 4, n^o 2 (29 décembre 2019) : 158–72. http://dx.doi.org/10.24017/science.2019.2.16.

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Smart antenna system has been studied extensively for the fifth generation of wireless communication systems, because it has made a system better performance of higher capacity and coverage as well as of power-saving. The present paper introduces a design of planar microstrip patch antenna array for a smart mobile system operating at 28 GHz. The present smart antenna has an adaptive radiation pattern that adjusts its main beam automatically to the desired direction by following the signal environment. This is based on the processing of an algorithm called the Least Mean Square (LMS) resulting in a change in the magnitude and phase of the feeding current for each element in the antenna array. From the obtained results, the main beam can be steered 180 degrees in the phi (azimuth) plane at a constant theta (elevation) angle. The planar antenna array was designed and simulated using CST Microwave Studio and MATLAB software that is used to find the required exciting current for each element. It is found that the antenna bandwidth is greater than 1 GHz while its gain is about 21 dB.

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Yu, Yang-bing, Chang-lin Leng, Jian Zhang et Chao Guo. « 21.4 : Smart Display and Antenna Integrated System ». SID Symposium Digest of Technical Papers 52, S1 (février 2021) : 140–42. http://dx.doi.org/10.1002/sdtp.14407.

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Santos, M. R., B. G. M. de Oliveira, M. T. de Melo, A. J. B. de Oliveira, E. A. B. Santos, R. D. Freitas, R. Serra et M. M. L. Santos. « A smart antenna system for remote supervision ». International Journal of Applied Electromagnetics and Mechanics 45, n^o 1-4 (6 mai 2014) : 293–99. http://dx.doi.org/10.3233/jae-141843.

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Liu, Run Jie, et Dan Li Kou. « TD-SCDMA Smart Antenna Signal Intensity Measurement System ». Advanced Materials Research 760-762 (septembre 2013) : 954–58. http://dx.doi.org/10.4028/www.scientific.net/amr.760-762.954.

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With the rapid development of China's TD-SCDMA system, how to qualitative and quantitative to judge intelligent antenna electromagnetic radiation pollution is a problem to be solved. Due to the special working principle of smart antenna, the second generation communication system spectrometer and field intensity meter measurement method is a complicated and difficult to operate. This paper introduces a design suitable for TD smart antenna measurement system: this system can realize in single user or multiple users at the same time and the TD base station set up calls link of multi-point synchronous signal intensity measurement. The measurement results of our system are very close to the measurement results of spectrometer field intensitys and can reasonable reflect TD stations around the extent of the electromagnetic radiation. This method of our system is easy, cheap and maneuverable

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Ishihara, K., T. Murakami, H. Abeysekera, M. Akimoto et Y. Takatori. « Distributed smart antenna system for high‐density WLAN system ». Electronics Letters 54, n^o 6 (mars 2018) : 336–38. http://dx.doi.org/10.1049/el.2017.4081.

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Cersoli, Trenton, Muneer Barnawi, Kerry Johnson, Edward Burden, Frank Li, Eric MacDonald et Pedro Cortes. « 4D Printed Shape Memory Polymers : Morphology and Fabrication of a Functional Antenna ». Recent Progress in Materials 4, n^o 2 (17 février 2022) : 1. http://dx.doi.org/10.21926/rpm.2202009.

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Shape memory polymers (SMPs) are smart materials that can respond to certain thermal, chemical or electrical stimuli by inducing a structural conformation change into a temporary shape. In this work, a 3D printing process based on a Vat Photo-polymerization of a shape memory polymer (SMP) was investigated to produce customized smart and complex morphable antennas. The mechanical and material properties were examined through a tensile, flexural and rheological testing for different polymer mixture ratios. It was observed that the combination of 20% of an elastomeric resin in a thermoset UV system yields the highest shape recovery performance. The fabrication process of the antenna was based on the incorporation of a conductive material. The approach involved the inclusion of a thin copper electroplating technique. The radiofrequency performance of the fabricated antenna was examined by a vector network analyzer (VNA) and it was observed that a thermal stimulus was capable of inducing a conformal shape on the antenna, resulting in a multi-radio frequency morphing system. The antenna performance was simulated in Ansys HFSS.

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Panagiotou, Stylianos C., Stelios C. A. Thomopoulos et Christos N. Capsalis. « Genetic Algorithms in Antennas and Smart Antennas Design Overview : Two Novel Antenna Systems for Triband GNSS Applications and a Circular Switched Parasitic Array for WiMax Applications Developments with the Use of Genetic Algorithms ». International Journal of Antennas and Propagation 2014 (2014) : 1–13. http://dx.doi.org/10.1155/2014/729208.

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Genetic algorithms belong to a stochastic class of evolutionary techniques, whose robustness and global search of the solutions space have made them extremely popular among researchers. They have been successfully applied to electromagnetic optimization, including antenna design as well as smart antennas design. In this paper, extensive reference to literature related antenna design efforts employing genetic algorithms is taking place and subsequently, three novel antenna systems are designed in order to provide realistic implementations of a genetic algorithm. Two novel antenna systems are presented to cover the new GPS/Galileo band, namely, L5 (1176 MHz), together with the L1 GPS/Galileo and L2 GPS bands (1575 and 1227 MHz). The first system is a modified PIFA and the second one is a helical antenna above a ground plane. Both systems exhibit enhanced performance characteristics, such as sufficient front gain, input impedance matching, and increased front-to-back ratio. The last antenna system is a five-element switched parasitic array with a directional beam with sufficient beamwidth to a predetermined direction and an adequate impedance bandwidth which can be used as receiver for WiMax signals.

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He, Hong, Cong Cong Wu, Hang Li, Tong Yang, Lin He et Ying He. « Smart Antenna Adaptive Interference Suppression in TD-SCDMA System ». Advanced Materials Research 204-210 (février 2011) : 476–81. http://dx.doi.org/10.4028/www.scientific.net/amr.204-210.476.

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The Smart Antenna which can adaptively track the user signals plays an important role in reducing the interferences among users in TD-SCDMA. This paper focuses on the study of the smart antenna adaptive beam-forming algorithm and aims at realizing the design and emulation of it by using the least mean square algorithm (LMS) and the recursive least squares algorithm (RLS). And by the comparison and analysis of the result, we want to learn its effectiveness in reducing the interferences in TD-SCDMA system.

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Yue, Zhou. « Design of Wireless Intelligent Electronics Card Four-Element Rectangular Micro-Strip Antenna Array ». Advanced Materials Research 503-504 (avril 2012) : 1203–7. http://dx.doi.org/10.4028/www.scientific.net/amr.503-504.1203.

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Wake-up signal reception sensitivity and the antenna has a close relationship, from the parking lot of the practical needs of communication, as well as the works of Wireless Intelligent Electronics Card System structure requirements, using a quarter-wavelength design four rectangular micro-strip antenna array modules. Wireless intelligent electronic card to participate in the car parks are long-distance communication systems RFID identification system, four modules of rectangular micro-strip antenna array to send wake-up signal is highly directional, and four units of rectangular micro-strip antenna array to send the signal electron can wake up the wireless smart card job, and avoid the region other than the wireless smart card electronic interference.

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Ding, Tongyu, Shaoqing Zhang, Liang Zhang et Yanhui Liu. « Smart Cylindrical Dome Antenna Based on Active Frequency Selective Surface ». International Journal of Antennas and Propagation 2017 (2017) : 1–14. http://dx.doi.org/10.1155/2017/5901625.

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In this paper, we proposed a beamforming antenna, which is realized using an omnidirectional antenna in the center surrounded by a cylindrical smart dome. The smart dome is made of 16 active frequency selective surface columns of which the amplitude and phase response can be continuously tuned by varying the bias voltages of the employed varactors. Thus, the performance of the proposed antenna could achieve higher gain, better nulling level, and more agility than many switch methods-based cylindrical reconfigurable antennas. Moreover, in order to overcome the unavailable analytical synthesis caused by complex mutual coupling between columns, we develop a genetic algorithm based optimization system and conducted a serial of experiments to evaluate the high-gain, nulling, continuously steering, and frequency-invariant ability. The results show that, during the frequency tunable range of the AFSS (2.0 GHz to 2.7 GHz), the antenna can offer an additional gain of up to 6.57 dB and nulling level of −56.41 dBi. For the high-gain modes, the −3 dB beam widths are 26°–34°, which offers enhanced angular resolution compared with other reported beam-sweeping work. Furthermore, the radiation pattern is continuously steerable.

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Gomathi, S., V. Sumitha et S. Ranjitha devi. « Implementation of Embedded Based Smart Antenna Orientation System ». International Journal of Communication and Networking System 5, n^o 1 (15 juin 2015) : 82–85. http://dx.doi.org/10.20894/ijcnes.103.005.001.022.

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Zhang, Huajun, Huotao Gao, Lin Zhou, Hao Li et Fan Wang. « HF superdirective smart antenna system for interference suppression ». IEICE Electronics Express 12, n^o 3 (2015) : 20141165. http://dx.doi.org/10.1587/elex.12.20141165.

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Mousa, Falih M. « Particle Swarm Optimization Algorithm for Smart Antenna System ». Journal of Mobile Communication 5, n^o 1 (1 janvier 2011) : 6–10. http://dx.doi.org/10.3923/jmcomm.2011.6.10.

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Marandi, Arun Kumar, Gordhan Jethava, A. Rajesh, Sachin Gupta, Shrddha Sagar et Sonia Sharma. « Cognitive Computing for Multimodal Sentiment Sensing and Emotion Recognition Fusion Based on Machine Learning Techniques Implemented by Computer Interface System ». International Journal of Communication Networks and Information Security (IJCNIS) 14, n^o 2 (31 août 2022) : 15–32. http://dx.doi.org/10.17762/ijcnis.v14i2.5462.

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A multiple slot fractal antenna design has been determined communication efficiency and its multi-function activities. High-speed small communication devices have been required for future smart chip applications, so that researchers have been employed new and creative antenna design. Antennas are key part in communication systems, those are used to improve communication parameters like gain, efficiency, and bandwidth. Consistently, modern antennas design with high bandwidth and gain balancing is very difficult, therefore an adaptive antenna array chip design is required. In this research work a coaxial fed antenna with fractal geometry design has been implemented for Wi-Fi and Radio altimeter application. The fractal geometry has been taken with multiple numbers of slots in the radiating structure for uncertain applications. The coaxial feeding location has been selected based on the good impedance matching condition (50 Ohms). The overall dimension mentioned for antenna are approximately 50X50X1.6 mm on FR4 substrate and performance characteristic analysis is performed with change in substrate material presented in this work. Dual-band resonant frequency is being emitted by the antenna with resonance at 3.1 and 4.3 GHz for FR4 substrate material and change in the resonant bands is obtained with change in substrate. The proposed Antenna is prototyped on Anritsu VNA tool and presented the comparative analysis like VSWR 12%, reflection coefficient 9.4%,3D-Gain 6.2% and surface current 9.3% had been improved.

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Pal, Soma, et Azazul Haque. « A review : algorithm used for beam forming systems ». International Journal of Engineering & ; Technology 7, n^o 1.2 (28 décembre 2017) : 58. http://dx.doi.org/10.14419/ijet.v7i1.2.8991.

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Wireless communication uses a smart antenna to provide better coverage and capacity for the communication system. Main functions performed by the smart antenna are Direction of Arrival estimation (DOA) and beamforming (DBF). The beam forming is signal processing techniques which combine antenna array technology with high-performance up/down-conversion, analog to digital conversion and digital signal processing to provide receivers with very high spatial selectivity. This paper evaluates non-blind algorithm such as LMS, to compute the weight calculation for phased array antenna using Matlab Simulink.

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Kim, Dowon, Kitae Kim, Hogyeong Kim, Moonyoung Choi et Jun-Hee Na. « Design Optimization of Reconfigurable Liquid Crystal Patch Antenna ». Materials 14, n^o 4 (16 février 2021) : 932. http://dx.doi.org/10.3390/ma14040932.

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In various fields such as the 5G antenna system and satellite communication system, there is a growing demand to develop a smart antenna with a frequency selective or beamforming function within a limited space. While antennas utilizing mechanical, electronic, and material characteristics are being studied, a method of having tunable frequency characteristics by applying a liquid crystal material with dielectric anisotropy to a planar patch antenna is proposed. In resonance mode, the design method for using only the minimum amount of expensive liquid crystals is systematically arranged while maximizing the amount of change in the operating frequency of the antenna by considering the electric field distribution on the surface of the patch antenna. Furthermore, to increase the dielectric anisotropy of the liquid crystal, the liquid crystal must be aligned. Simultaneously, in cases where the cell gap of the liquid crystal exceeds 100 μm, the alignment force is weakened. While compensating for this shortcoming, securing the radiation characteristics of the antenna is proposed, and simulations are performed.

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Mac, Thanh-Tung, Daisuke Iba, Yusuke Matsushita, Seiya Mukai, Nanako Miura, Arata Masuda et Ichiro Moriwaki. « Effect of Phase Fluctuation on the Proper Operation of Smart Gear Health Monitoring System ». Sensors 22, n^o 9 (22 avril 2022) : 3231. http://dx.doi.org/10.3390/s22093231.

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A smart gear sensor system has been developed for the condition monitoring of gear. This system includes a smart gear—the operation gear and a monitoring antenna. The analysis of the return loss of the monitoring antenna magnetically coupled with the smart gear gives the health condition of the gear. This research considers the effects of the distance and phase fluctuations between two components on the magnetic resonant return loss. The impacts of phase fluctuations include both static and high-speed conditions. Two experimental rigs have been built for the two cases. The coupling distance and static phase fluctuation are conducted via the first experimental rig. The second experimental rig performs both the coupling distance and phase fluctuation effect simultaneously while the smart gear rotates at high speed. During each test, the monitoring antenna return loss is captured thanks to a network analyzer. Analysis of the return loss data demonstrates that both the coupling distance and the change of the phase angle at the static condition and high speed have influenced the resonant return loss of the monitoring antenna. These findings are meaningful to the authors for evaluating and improving the accuracy of this gear health monitoring technique.

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Zanette, Luca, Leonardo Reyneri et Giuseppe Bruni. « Swarm system for CubeSats ». Aircraft Engineering and Aerospace Technology 90, n^o 2 (5 mars 2018) : 379–89. http://dx.doi.org/10.1108/aeat-07-2016-0119.

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Purpose This paper aims to present an innovative system able to establish an inter-satellite communication crosslink and to determine the mutual physical positioning for CubeSats belonging to a swarm. Design/methodology/approach Through a system involving a smart antenna array managed by a beamforming control strategy, every CubeSat of the swarm can measure the direction of arrival (DOA) and the distance (range) to estimate the physical position of the received signal. Moreover, during the transmission phase, the smart antenna shapes the beam to establish a reliable and directive communication link with the other spacecraft and/or with the ground station. Furthermore, the authors introduce a deployable structure fully developed at Politecnico di Torino that is able to increase the external surface of CubeSats: this surface allows to gain the interspace between elements of the smart antenna. Findings As a consequence, the communication crosslink, the directivity and the detection performance of the DOA system in terms of directivity and accuracy are improved. Practical implications Moreover, the deployable structure offers a greater usable surface, so a larger number of solar panels can be used. This guarantees up to 25 W of average power supply for the on-board systems and for transmission on a one-unit (1U) CubeSat (10 × 10 × 10 cm). Originality/value This paper describes the physical implementation of the antenna array system on a 1U CubeSat by using the deployable structure developed. Depending on actuators and ability that every CubeSat disposes, various interaction levels between elements can be achieved, thus making the CubeSat constellation an efficient and valid solution for space missions.

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Xie, Zong Hong, Fei Peng, Peng Zhang et Wei Zhao. « A Smart Skin Antenna Structure for Global Navigation Satellite System ». Applied Mechanics and Materials 464 (novembre 2013) : 316–20. http://dx.doi.org/10.4028/www.scientific.net/amm.464.316.

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This paper introduces the research work on the development of a Smart Skin Antenna Structure (SSAS) for Global Navigation Satellite System (GNSS) by embedding a navigation antenna with working frequency from 1.2GHz to 1.6GHz into a composite sandwich structure. The structure possesses the load-bearing, shape maintaining and navigation capabilities at the same time. Numerical models have been generated to design and evaluate the EM property of this multifunctional structure. Specimens have been manufactured and tested. The test data show relatively good correlation to the numerical results.

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Garg, Laxpati et Dexin Wang. « Use of smart antenna system in universal mobile communications systems (UMTS) ». IEEE Antennas and Wireless Propagation Letters 3 (2004) : 66–70. http://dx.doi.org/10.1109/lawp.2004.827901.

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S. Jyothi Lakshmi, T., S. Sandeep et Dr V. Rajya Lakshmi. « Angle of Arrival Estimation in Smart Antenna for Wireless Communication ». International Journal of Engineering & ; Technology 7, n^o 4.7 (27 septembre 2018) : 136. http://dx.doi.org/10.14419/ijet.v7i4.7.20529.

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Smart antenna technology has emerged as one of the most efficient techniques in supporting maximum communication link throughput. A smart antenna system with innovative signal processing can enhance the resolution of a signal’s direction of arrival estimation. Successful design of Smart antenna is dependent on the efficient performance of DOA estimation algorithm as well as beamforming algorithm. This paper presents a comparative performance study between Classical Beam forming method, MUSIC (Multiple Signal Classification), MVDR (Minimum Variance Distortion less Response) which are different direction of arrival algorithms used in linear antenna array. The objective is to analyse and compare these algorithms and determine which provides maximum efficiency.

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Wang, Ting, Ke-Wen Xia et Ning Lu. « Pattern Synthesis for Sparse Arrays by Compressed Sensing and Low-Rank Matrix Recovery Methods ». International Journal of Antennas and Propagation 2018 (2018) : 1–11. http://dx.doi.org/10.1155/2018/6403269.

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Antenna array pattern synthesis technology plays a vital role in the field of smart antennas. It is well known that the pattern synthesis of homogeneous array is the key topic of pattern synthesis technology. But this technology needs plenty of homogeneous array elements to meet the antenna requirements. So, a novel pattern synthesis technology for sparse array based on the compressed sensing (CS) and low-rank matrix recovery (LRMR) methods is proposed. The proposed technology predominantly includes the design of sparse array, the recovery of homogeneous array, and the synthesis of antenna array pattern. The simulation result shows that an antenna array with low gain and strong directivity can be arbitrarily built by the use of a small amount of sparse array elements and it is useful for the miniaturization and economical efficiency of the antenna system.

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Petropoulos, Ioannis, Konstantinos Voudouris, Raed A. Abd-Alhameed, Steve M. R. Jones et Nikos Athanasopoulos. « A Novel Design of Microstrip Arrays for Relay-Based Wireless Network ». International Journal of Antennas and Propagation 2011 (2011) : 1–10. http://dx.doi.org/10.1155/2011/870183.

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A relay station (RS) is a smart transceiver used under a 4G wireless network in order to extend network's coverage and capacity. It uses an antenna system that includes an antenna for connecting the relay with the end users (access link) and the RS with the base station (backhaul link). In this paper, a 7.9 dBi access and 11.4 dBi backhaul antennas are presented for the frequency range of 3.3 to 3.8 GHz. The antennas are simulated and fabricated, and relevant measured results in terms of return loss and radiation pattern are presented and analyzed. Considering that the planes of those two antennas are positioned in an angle (omega), two antenna configuration geometries are tested in terms of coupling. The experimental results of for several values of the angle show that the interaction between the radiating elements is dependent on their relative position. Simulated and experimental results are in good agreement, showing coupling typically less than −40 dB. A comparison in terms of coupling between the proposed antennas and commercial ones proves that the suggested antennas provide 10 dB lower coupling.

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Fawad, Iffath, et H. V. Kumaraswamy. « Failure Recovery in a Smart Antenna System for Remote Applications ». International Journal for Research in Applied Science and Engineering Technology 10, n^o V (31 mai 2022) : 3297–302. http://dx.doi.org/10.22214/ijraset.2022.42713.

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This paper focusses on recovering the degraded pattern in the event of failure of elements in a Smart Antenna System. A well-known optimisation algorithm namely: Levy Harmony Search (LHS) Algorithm is employed to optimise the excitations of the remaining ‘healthy’ elements to recover from the degradation caused due to the element failures. A 1×10 Microstrip Patch Antenna Array, working in the 5G frequency band 3.3-3.7 GHz, is designed to closely observe the effects of element failures, followed by the recovery of the pattern by modifying certain parameters. Algorithm considered is simulated using MATLAB and the results of the simulation are validated using HFSS.

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Schäfer, Sassan, Simon Müller, Daniel Schmiech et Andreas R. Diewald. « Radar system with dedicated planar traveling wave antennas for elderly people monitoring ». Advances in Radio Science 18 (10 décembre 2020) : 97–110. http://dx.doi.org/10.5194/ars-18-97-2020.

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Abstract. Radar systems for contactless vital sign monitoring are well known and an actual object of research. These radar-based sensors could be used for monitoring of elderly people in their homes but also for detecting the activity of prisoners and to control electrical devices (light, audio, etc.) in smart living environments. Mostly these sensors are foreseen to be mounted on the ceiling in the middle of a room. In retirement homes the rooms are mostly rectangular and of standardized size. Furniture like beds and seating are found at the borders or the corners of the room. As the propagation path from the center of the room ceiling to the borders and corners of a room is 1.4 and 1.7 time longer the power reflected by people located there is 6 or even 10 dB lower than if located in the center of the room. Furthermore classical antennas in microstrip technology are strengthening radiation in broadside direction. Radar systems with only one single planar antenna must be mounted horizontally aligned when measuring in all directions. Thus an antenna pattern which is increasing radiation in the room corners and borders for compensation of free space loss is needed. In this contribution a specification of classical room sizes in retirement homes are given. A method for shaping the antenna gain in the E-plane by an one-dimensional series-fed traveling wave patch array and in the H-plane by an antenna feeding network for improvement of people detection in the room borders and corners is presented for a 24 GHz digital beamforming (DBF) radar system. The feeding network is a parallel-fed power divider for microstrip patch antennas at 24 GHz. Both approaches are explained in theory. The design parameters and the layout of the antennas are given. The simulation of the antenna arrays are executed with CST MWS. Simulations and measurements of the proposed antennas are compared to each other. Both antennas are used for the transmit and the receive channel either. The sensor topology of the radar system is explained. Furthermore the measurement results of the protoype are presented and discussed.

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Ikram, Muhammad, Kamel Sultan, Muhammad Faisal Lateef et Abdulrahman S. M. Alqadami. « A Road towards 6G Communication—A Review of 5G Antennas, Arrays, and Wearable Devices ». Electronics 11, n^o 1 (5 janvier 2022) : 169. http://dx.doi.org/10.3390/electronics11010169.

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Next-generation communication systems and wearable technologies aim to achieve high data rates, low energy consumption, and massive connections because of the extensive increase in the number of Internet-of-Things (IoT) and wearable devices. These devices will be employed for many services such as cellular, environment monitoring, telemedicine, biomedical, and smart traffic, etc. Therefore, it is challenging for the current communication devices to accommodate such a high number of services. This article summarizes the motivation and potential of the 6G communication system and discusses its key features. Afterward, the current state-of-the-art of 5G antenna technology, which includes existing 5G antennas and arrays and 5G wearable antennas, are summarized. The article also described the useful methods and techniques of exiting antenna design works that could mitigate the challenges and concerns of the emerging 5G and 6G applications. The key features and requirements of the wearable antennas for next-generation technology are also presented at the end of the paper.

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Ghayoula, R., A. Smida, A. Gharsallah et D. Grenier. « Smart Base Station Antenna Performance for Cellular Radio System ». Journal of Engineering Science and Technology Review 6, n^o 5 (décembre 2013) : 38–47. http://dx.doi.org/10.25103/jestr.065.06.

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Abdallah, Abdulkareem S., et Falih M. Mousa. « A Modified Continuous Genetic Algorithm for Smart Antenna System ». Journal of Engineering and Applied Sciences 5, n^o 4 (1 avril 2010) : 332–36. http://dx.doi.org/10.3923/jeasci.2010.332.336.

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Yasin, M., Pervez Akhtar et M. Junaid Khan. « CMA an Optimum Beamformer for a Smart Antenna System ». International Journal of Computer Applications 5, n^o 6 (10 août 2010) : 33–40. http://dx.doi.org/10.5120/923-1301.

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Shi, Chun, Xian Hua Dai, Shu Qian He, Zheng Jie Deng et Ping Yuan Liang. « Packet Scheduling Algorithm in MAC of Smart Antenna System ». Applied Mechanics and Materials 263-266 (décembre 2012) : 1076–80. http://dx.doi.org/10.4028/www.scientific.net/amm.263-266.1076.

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Head of Line (HOL) blocking and deaf node problem are the main challenges in the smart antenna system in wireless ad hoc networks. To resolve these difficulties, we propose a novel packet scheduling algorithm based on the Directional Network Allocation Vector (DNAV). In the new algorithm, we divide the surrounding space of a tagged node into interference regions and free regions, and then transmit packets selected in turn from the data queue if there is an appropriately free region. The proposed algorithm can eliminate the deaf node problem and resolve the HOL blocking efficiently. Higher throughput and lower network delay are obtained by adapting to the dynamic network topology than other methods. The simulation results confirm the validity of the proposed algorithm.

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Aaron Don, M. Africa. « Design of a Low-power Smart Antenna System Algorithm ». International Journal of Emerging Trends in Engineering Research 8, n^o 8 (25 août 2020) : 4443–48. http://dx.doi.org/10.30534/ijeter/2020/65882020.

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Buckley, J., D. Gaetano, K. G. McCarthy, L. Loizou, B. O'Flynn et C. O'Mathuna. « Compact 433 MHz antenna for wireless smart system applications ». Electronics Letters 50, n^o 8 (avril 2014) : 572–74. http://dx.doi.org/10.1049/el.2013.4312.

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