Bibliographies thématiques / UWB APPLICATIONS

Littérature scientifique sur le sujet « UWB APPLICATIONS »

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Publié le 11 septembre 2023

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Articles de revues sur le sujet "UWB APPLICATIONS"

Saeidi, Tale, Idris Ismail, Wong Peng Wen, Adam R. H. Alhawari et Ahmad Mohammadi. « Ultra-Wideband Antennas for Wireless Communication Applications ». International Journal of Antennas and Propagation 2019 (22 avril 2019) : 1–25. http://dx.doi.org/10.1155/2019/7918765.

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A review paper concerning wide-band and ultra-wideband (UWB) antennas used for wireless communication purposes in terms of the materials as well as a numerical analysis is presented. These antennas which are taken into account are listed as wide-band microstrip antenna, wide-band monopole antenna over a plate, wide-slot UWB antenna, stacked patch UWB antenna, taper slot (TSA) UWB antenna, metamaterial (MTM) structure UWB antennas, elliptical printed monopole UWB antenna, and flexible wearable UWB antenna. The antennas’ performance is compared based on their size and how they can be applicable for portable communication device applications. This review paper furnishes a proper direction to select varieties of figures in terms of impedance bandwidth, gain, directivity, dimensions, time domain characteristics, and materials affecting these antenna’s characteristics.

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Kamboj, Sheetal, et Amit Kumar. « CPW-Fed Ring Antenna For UWB Applications ». International Journal of Engineering Research 3, n^o 3 (1 mars 2014) : 146–49. http://dx.doi.org/10.17950/ijer/v3s3/303.

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Kumar, Om Prakash, Pramod Kumar, Tanweer Ali, Pradeep Kumar et Shweta Vincent. « Ultrawideband Antennas : Growth and Evolution ». Micromachines 13, n^o 1 (30 décembre 2021) : 60. http://dx.doi.org/10.3390/mi13010060.

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Narrowband antennas fail to radiate short pulses of nano- or picosecond length over the broader band of frequencies. Therefore, Ultrawideband (UWB) technology has gained momentum over the past couple of years as it utilizes a wide range of frequencies, typically between 3.1–10.6 GHz. UWB antennas have been utilized for various applications such as ground-penetrating radars, disaster management through detection of unexploded mines, medical diagnostics, and commercial applications ranging from USB dongles to detection of cracks in highways and bridges. In the first section of the manuscript, UWB technology is detailed with its importance for future wireless communications systems. In the next section various types of UWB antennas and their design methodology are reviewed, and their important characteristics are highlighted. In section four the concept of a UWB notch antenna is presented. Here various methods to obtain the notch, such as slots, parasitic resonators, metamaterials, and filters are discussed in detail. In addition, various types of important notch antenna design with their technical specifications, advantages, and disadvantages are presented. Finally, the need of reconfigurable UWB notch antennas is discussed in the next section. Here various insight to the design of frequency reconfigurable notch antennas is discussed and presented. Overall, this article aims to showcase the beginnings of UWB technology, the reason for the emergence of notching in specific frequency bands, and ultimately the need for reconfiguring UWB antennas along with their usage.

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Li, L., Z. L. Zhou et J. S. Hong. « Compact UWB antenna with four band-notches for UWB applications ». Electronics Letters 47, n^o 22 (2011) : 1211. http://dx.doi.org/10.1049/el.2011.2334.

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Nath, Rhea, et Promod Singh. « MIMO Antenna for UWB Applications ». International Journal of Engineering Trends and Technology 53, n^o 1 (25 novembre 2017) : 13–18. http://dx.doi.org/10.14445/22315381/ijett-v53p204.

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Tneyoung Yang, Seong-Youp Suh, R. Nealy, W. A. Davis et W. L. Stutzinan. « Compact antennas for UWB applications ». IEEE Aerospace and Electronic Systems Magazine 19, n^o 5 (mai 2004) : 16–20. http://dx.doi.org/10.1109/maes.2004.1301221.

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Immoreev, Igor Y. « Practical applications of UWB technology ». IEEE Aerospace and Electronic Systems Magazine 25, n^o 2 (février 2010) : 36–42. http://dx.doi.org/10.1109/maes.2010.5442175.

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Jiang, Shaohua, Miroslaw J. Skibniewski, Yongbo Yuan, Chengshuang Sun et Yujie Lu. « ULTRA-WIDE BAND APPLICATIONS IN INDUSTRY : A CRITICAL REVIEW / ULTRAPLAČIOS JUOSTOS BANGŲ TAIKYMAS PRAMONĖJE : KRITINĖ APŽVALGA ». Journal of Civil Engineering and Management 17, n^o 3 (20 septembre 2011) : 437–44. http://dx.doi.org/10.3846/13923730.2011.596317.

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As a radically distinct wireless communication approach compared to traditional narrow band systems, ULTRA-WIDE BAND (UWB) technology has been applied in various sectors and is gaining in popularity, but there appears to be a lack of systematic summary of the potential of this technology. To provide insights into UWB technology for the uninitiated reader, this paper explores the state-of-the-art research and development of UWB applications in many sectors including the construction industry without concerning the technological details. First this paper presents the key concepts related to UWB technology and a brief history of UWB. Then it summarizes the UWB's technical features which enable its popularity in industry. Finally, application examples of UWB technology in many sectors, including construction, are presented to analyze and highlight the impact on the industry performance. In the near future UWB technology is expected to become a very important component and have far-reaching impact in ubiquitous computing. Santrauka Bevielio ryšio ultraplačios juostos bangų (UWB) technologija, radikaliai besiskirianti nuo tradicinės siauros juostos sistemų, buvo plačiai taikoma įvairiuose sektoriuose ir tampa vis populiaresnė, tačiau akivaizdu, kad vis dar trūksta susistemintos šios technologijos galimybių apžvalgos. Siekiant pateikti įžvalgas apie UWB technologiją, šiame straipsnyje analizuojami dabartiniai UWB technologijos tyrimai ir UWB taikymas įvairiuose sektoriuose, įskaitant statybą, nenagrinėjant technologinių detalių. Pirmiausia šiame straipsnyje pristatomos pagrindinės sąvokos, susijusios su UWB technologija ir UWB technologijos istorine raida. Tada susisteminamos techninės UWB technologijos charakteristikos, kurios lemia jos populiarumą pramonėje. Galiausiai analizuojami UWB technologijos taikymo pavyzdžiai įvairiuose sektoriuose, įskaitant statybą, atkreipiant dėmesį į jų poveikį pramonės veiklai. Netolimoje ateityje UWB technologija turėtų tapti labai svarbi ir turėti ilgalaikį poveikį visuotinei kompiuterizacijai.

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Rashid, Nasr, et Mohamed Shehata. « Ultra-wide band energy harvesting for ultra-low power electronics applications ». International Journal of Electrical and Computer Engineering (IJECE) 11, n^o 2 (1 avril 2021) : 1158. http://dx.doi.org/10.11591/ijece.v11i2.pp1158-1165.

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In this work, the feasibility of energy harvesting in the useful UWB band (i.e., 3.1-10.6 GHz) is analytically investigated. A typical UWB communications/EH chain in this band is modeled and analyzed, considering the spectral constraints imposed by the federal communications commission (FCC) to UWB signaling. Based on the developed model, accurate analytical expressions are derived for the average received powers of two common types of impulse radio UWB (IR-UWB) signaling waveforms. Numerical simulations on the system-level show excellent agreement with the obtained analytical expressions. Moreover, the DC power levels expected from spectrally constrained IR-UWB waveforms are extremely low (less than 0.3 microwatt) and, accordingly, provide useful guidelines for the design and development of ULP electronics applications in the sub-microwatt range.

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Zhou, Zhiyi. « An Overview of Ultra-Wideband Positioning Technology and Its Applications ». SHS Web of Conferences 144 (2022) : 02001. http://dx.doi.org/10.1051/shsconf/202214402001.

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UWB is a kind of wireless communication technology used in plenty of high-tech factories but seldom seen in humans’ daily life. Encouraged by the public, experts are urged to do futher reserch because of its accurate positioning. This paper introduces the background and features of UWB. Five methods of UWB localization are listed and the disadvantages and principals of each method are also listed, like RSSI (Received Signal Strength Indication). Existing applications of UWB are divided and shown in two types: which are categorized by function and scene. The conclusion and expectation about UWB are shown: creative methods need to be applied to drop the cost of such products so that they have access to potential customers.

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Thèses sur le sujet "UWB APPLICATIONS"

Ripoche, Olivier. « Miniaturisation d’antennes en bande VHF pour applications spatiales ». Phd thesis, Toulouse, INPT, 2013. http://oatao.univ-toulouse.fr/11383/1/ripoche_partie_1_sur_2.pdf.

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Le développement de l’électronique embarquée et miniaturisée est pleinement d’actualité de nos jours, dans les domaines tels que l’armement, la médecine, et les télécommunications. La miniaturisation des antennes large-bande, opérationnelles sur plus d’une décade, présentent un défi particulier. Ces travaux de thèse proposent de travailler sur la miniaturisation d’une antenne spirale, afin d’en réduire l’encombrement, à savoir son diamètre, tout en conservant au mieux ses caractéristiques de rayonnement et polarisation intrinsèques. Cette recherche sera appliquée à la bande des Très hautes Fréquence (Very High Frequencies – VHF), allant de 30MHz à 300MHz La géométrie inédite proposée consiste à associer à une antenne spirale un ensemble d’anneaux résonnants, dont le diamètre n’excède pas celui de la spirale, et permettant de diminuer la fréquence basse de fonctionnement. Pour un ensemble de cinq anneaux associé à la spirale, la réduction de la fréquence basse de fonctionnement est de plus de 30%. Pour deux antennes spirales de même fréquence basse de fonctionnement, l’antenne miniaturisée a donc un diamètre réduit de 30%, soit une surface réduite de 50%. Les performances de l’état de l’art d’après lesquelles les réductions sur le diamètre des antennes spirales n’excèdent pas 15% sont donc dépassées. De plus, d’après cet état de l’art, les méthodes de réduction appliquées aux antennes large bande dégradent en général le gain et l’axial ratio dans les bandes basses de fréquences de fonctionnement. La méthode proposée permet de conserver l’efficacité de l’antenne, voire de l’augmenter, dans les fréquences proches de la fréquence basse de fonctionnement. Le rayonnement de l’antenne spirale miniaturisée dans la bande passante de l’antenne sans anneaux n’est pour autant pas modifiée. Ces résultats très encourageant ont été confirmés par la mesure d’antennes spirales miniaturisées, réalisées pour un diamètre de 8cm et de 1m : une réduction de 30% du diamètre sans dégradation du rayonnement a été observée. Les mesures ont par ailleurs donné lieu à l’étude de la réalisation d’une antenne en bande VHF, avec pour implication les problématiques de réalisation (masse, encombrement, résistance mécanique) et de mesure (isolation, effets parasites en VHF avec une longueur d’onde de 4m).

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Liu, Li, et 劉荔. « Compact planar UWB antennas for wireless device applications ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/207199.

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The thesis report presents the designs of compact planar ultra-wideband (UWB) antennas for wireless devices applications. Three main designs of UWB antennas are studied, namely, single UWB antennas, UWB multiple-input-multiple-out(MIMO)antennas, and transparent UWB antennas on the screens of mobile phones. For single UWB antennas, the designs of two compact planar monopole antennas with compact sizes of 26×28 mm2and 30×39.3mm2are presented. The UWB operations of the antennas are achieved using a ground slot under the feed line, offsetting the feed line and the radiator from the middle of the ground plane and smoothly transforming the feed line. Simulation and measurement show that the two antennas can achieve an ultra-wide bandwidth with approximately omnidirectional patterns. A deep notch-band in5.1-5.85 GHz is created in one of the UWB antennas by employing two pairs of meander lines (MLs), one pair being close to the feed line and the other pair along the upper edge of the ground plane. At the notch frequency, the simulated efficiency is only 4%. Three compact UWB-MIMO antennas with very compact sizes of 26×40 〖mm〗^2, 21×38 〖mm〗^2, and 22×36 〖mm〗^2 are designed. Each of them is designed using two UWB antenna elements perpendicularly or symmetrically placed. Different techniques such as using ground stubs besides the radiators, cutting inclined slots on the ground, and adding a T-shaped protruding from ground are proposed to lower mutual coupling between the two antenna elements. One of the antennas is designed to generate a notched band in 5.15-5.85 GHz using two ground strips. Simulation and measurement results show that these antennas can cover the entire UWB of 3.1-10.6GHz with mutual coupling of less than -15 dB, and envelope correlation coefficient of less than 0.1. An UWB antenna is designed using a transparent conductive film for applications on mobile phone screens. The effects of a finger touching the screen are studied. Results show that, with the radiator on the bottom side of the screen and a thin film with a thickness of 0.05 mm on the top side to separate the finger and the antenna, the effects of the finger can be minimized. In measurement of monopole antennas with small ground planes, due to the feeding cable used, there are always discrepancies between the simulated and measured results in radiation patterns, efficiencies, and gains at lower frequencies. To verify that the discrepancies in the results of these studies are indeed due to the feeding cable used in measurement, the models of the feeding cables are developed and used for simulation. Results show that, by using the cable model, the simulated and measured results in radiation patterns, efficiencies, and gains agree very well.
published_or_final_version
Electrical and Electronic Engineering
Doctoral
Doctor of Philosophy

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Jose, Sajay. « Design of RF CMOS Power Amplifier for UWB Applications ». Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/36391.

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Ever since the FCC allocated 7.5 GHz (from 3.1 GHz to 10.6 GHz) for ultra wideband (UWB) technology, interest has been renewed in both academic and industrial circles to exploit this vast spectrum for short range, high data rate wireless applications. The great potential of UWB lies in the fact that it can co-exist with the already licensed spectrum users and can still pave the way for a wide range of applications. However, this wide bandwidth complicates the circuit level implementation of key RF blocks like the power amplifier (PA), transmit/receive switch, low noise amplifier (LNA) and mixers in an UWB transceiver. Though expensive technologies like SiGe or GaAs have been used for transceiver realizations, the ultimate goal is to have a single-chip, low-cost solution which can only be achieved by using CMOS technology. Nevertheless, some of the inherent limitations of CMOS like lower fT of transistors make the design of UWB circuits in CMOS an extremely challenging task. Two proposals- Multi-Band OFDM and Direct-Sequence CDMA have been put before the IEEE 802.15.3a task group to decide on the industry standard for the commercial deployment of this technology. Though the debate on which standard is better has not been resolved, proponents of both the groups have already begun to develop prototypes of their respective proposals. This thesis describes the design of a key RF block in the UWB transceiver - the Power Amplifier. For the first part of this work, a PA suitable for MB-OFDM specifications was designed and fabricated in TSMC 0.18um CMOS technology. The class-AB PA is able to cover the lower UWB frequency band from 3.1 GHz to 4.75 GHz and delivers an output power of -2 dBm at 4 GHz. Simulated results show a gain of 19Â±2 dB achieved over the entire band and the PA consumes 36.54 mW from a 1.8V supply. In the second part of this work, a PA that meets the DS-CDMA specifications was designed and fabricated. This PA operates in the class-AB regime, delivering an output power of -4.2 dBm with input-1dB compression point at -22 dBm. Complete design and implementation was done using TSMC 0.18um CMOS technology and it consumes a very low power of 25 mW, while realizing a flat gain of 19Â±1 dB across the whole band of operation. All the above mentioned results are from simulations in SpectreRF and measurements are yet to be taken. Additional features like power ON/OFF scheme and output impedance control has also been incorporated in the design.
Master of Science

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Volos, Haris I. « Ultra Wideband Ranging and Link Budget Design for Naval Crane Applications ». Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/33652.

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In this thesis a UWB-based ranging scheme is designed, simulated, implemented and tested. This system was designed to address the problem of safely unloading cargo crates to ships in the open seas. UWB antennas are placed on the four corners of the cargo crate, providing the information needed to a ranging/positioning algorithm that estimates the orientation and distance of the ship's deck from the crate. Furthermore, the system is successfully tested in a 1/24 scale demonstration. In addition to the UWB ranging application, this thesis evaluates an already proposed modification to the traditional narrowband link budget based on the Friis transmission formula. The proposed modification replaces frequency-domain parameters with time-domain values to handle the wide bandwidth of UWB systems. The proposed approach is shown via measurements to be much more accurate than the traditional technique.
Master of Science

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Morsy, Mohamed Mostafa. « DESIGN AND IMPLEMENTATION OF MICROSTRIP MONOPOLE AND DIELECTRIC RESONATOR ANTENNAS FOR ULTRA WIDEBAND APPLICATIONS ». OpenSIUC, 2010. https://opensiuc.lib.siu.edu/dissertations/169.

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Ultra wide-band (UWB) technology is considered one of the very promising wireless technologies in the new millennium. This increases the demand on designing UWB antennas that meet the requirements of different UWB systems. In this dissertation, different UWB antennas are proposed such as an antenna that covers almost the entire UWB bandwidth, 3.5-11 GHz, as defined by the federal communication commission (FCC). This antenna has a size of 50×40×1.5mm3. Miniaturized worldwide UWB antennas are also introduced. Miniaturized worldwide UWB antennas that have compact sizes of (30×20×1.5) mm3, and (15×15×1.5) mm3 are also investigated. The designed worldwide UWB antennas cover the UWB spectrums defined by the electronic communication committee (ECC), 6-8.5 GHz, and the common worldwide UWB spectrum, 7.4-9 GHz. A system consisting of two identical antennas (transmitter and receiver) is built in the Antennas and Propagation Lab at Southern Illinois University Carbondale (SIUC) to test the coupling properties between every two identical antennas. The performance of that system is analyzed under different ii conditions to guarantee that the transmitted signal will be correctly recovered at the receiver end. The designed UWB antennas can be used in many short range applications such as wireless USB. Wireless USB is used in PCs, printers, scanners, laptops, MP3 players, hard disks and flash drives. A new technique is introduced to widen the impedance bandwidth of dielectric resonator antennas (DRAs). DRA features compactness, low losses, and wideband antennas. Different compact UWB DRAs are investigated in this dissertation. The designed DRAs cover a wide range of frequency bands such as, 6.17-24GHz, 4.23-13.51GHz, and 4.5-13.6GHz. The designed DRAs have compact sizes of 1×1×1.5cm3, 0.9×0.9×1.32cm3, 0.6×0.6×1cm3, and 0.6×0.6×0.9cm3; and cover the following frequency bands 4.22-13.51GHz, 4.5-13.6GHz, 6.1-23.75GHz, and 6.68-26.7GHz; respectively. The proposed DRAs may be used for applications in the X, Ku and K bands such as military radars and unmanned airborne vehicles (UAV).

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Gao, Yang. « Robust cooperative positioning using DGPS and UWB for V2X applications ». Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/42843/.

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Road transportation injuries, environmental pollution, and traffic congestion have resulted in a considerable cost to society annually. They have led to an increasing demand for a new generation of Intelligent Transportation Systems (ITS) road applications, which promise to tackle these widespread issues. A common element of such applications is the positioning system, and its performance has been highlighted as one of the key enablers. With the rapid expansion of Global Navigation Satellite Systems (GNSS), satellite-based positioning and navigation will continue to be the predominant positioning solution for most of ITS road applications. GNSS positioning systems offer global coverage, they are primarily free of charge, operate in all weather conditions, and are available all day, every day. However, there are challenges for GNSS-based positioning for ITS applications; in particular, the limited availability and degraded performance of GNSS signals in urban canyons. These challenges could impede the adoption of ITS applications, such as collision avoidance systems, lane departure warning systems, connected and autonomous vehicles. There is a gap between the positioning performance of GNSS-based systems and the positioning performance demanded by ITS applications. To bridge this gap, this research considers multi-sensor integration and cooperative positioning based on vehicle-to-vehicle, vehicle-to-infrastructure, and vehicle-to-pedestrian communications (collectively known as V2X communication). In comparison to other radio frequency augmentation techniques, Ultra-Wideband (UWB) is of particular interest for multi-sensor integration due to its fine time resolution and robust performance in high signal multipath environments. In addition to this benefit, Dedicated Short Range Communication (DSRC), as a key enabling communication component in V2X communication, not only allows vehicles to exchange their position information but also to share traffic safety-related information such as real-time congestion, accident and incident details, and variable speed limits. By taking advantage of DSRC, a vehicle in a GNSS hostile environment can calculate its position based on data shared from surrounding road users. This thesis utilises Global Positioning System (GPS) as a representative of GNSS and proposes to augment Differential GPS (DGPS) with UWB ranging observations attained from surrounding vehicles and infrastructure. It is accomplished by tightly integrating double-difference (DD) code pseudo-range GPS observations and UWB ranging observations using a Robust Kalman Filter. The performance of the proposed Robust Cooperative Positioning (RCP) method is evaluated using real and simulated GPS code pseudo-range and UWB ranging observations supported by assumed DSRC transmission. This thesis carries out a thorough assessment of the ranging performance, error sources and positioning performance of the Thales UWB Lock-on Model LD2. The assessment is completed by conducting a series of tests in different static and dynamic situations. In addition to this in-field assessment of the UWB device, the positioning performance of the proposed RCP method is demonstrated in both favourable and hostile GPS environments. The proposed RCP method effectively eliminates the impact of observed outliers, and the integrated RCP solution outperforms the DGPS-only solution, especially when the GPS signal is partially or fully obstructed. The results based on simulated UWB ranging observations and real GPS code pseudo-range observations on the roof of the Nottingham Geospatial Building achieve sub-metre three-dimensional accuracies when three DD code pseudo-ranges and four UWB ranging observations are available.

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Fabbri, Davide <1990&gt. « Energy Autonomous RF Tags for Sensing and UWB Localization Applications ». Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amsdottorato.unibo.it/9610/1/Fabbri_Davide_tesi.pdf.

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In the new scenarios foreseen by the Internet of Things (IoT), billions of smart devices are worldwide spread and connected to each other to provide sensing information or to detect and locate tagged items with high accuracy using cheap, energy autonomous, and disposable tags. In this context, the use of energy harvesting techniques to supply devices, nowadays, plays an important role in order to create energy autonomous systems able to reduce the use of batteries, by containing the infrastructure maintenance costs, for better environmental safeguard. Hence, by considering real scenarios in which tags can be placed, where only few µW are available as input source, low-power design aspects, strategies and policies have to be taken into account during the implementation approach. In order to cover all possible solutions, radio-frequency and light energy harvesting sources are considered to build battery-less nodes. Thus, PV passive tags for indoor and outdoor environments will be presented, which allows the creation of long range Wireless Sensor Networks (WSNs) used for environmental monitoring. In harsh scenarios where the presence of obstacles makes energy scavenging operations more critical, radio-frequency sources can be adopted to build battery-less, individually addressable, UHF tags, featuring high-directive behaviour with single-monopole structures or an orientation-independent usage through double-monopole architectures. UWB circuitry for localization purposes will be introduced in both configurations: transmitting and backscattering tag solutions adopting, in the first case, a customized protocol for the UHF link, while in the second one, a RFID integration compliant with European standard, by making this activity more attractive for the market.

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Zhao, Jun. « Silicon-Based RFIC Multi-band Transmitter Front Ends for Ultra-Wideband Communications and Sensor Applications ». Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/28864.

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Fully integrated Ultra-Wideband (UWB) RFIC transmitters are designed in Si-based technologies for applications such as wireless communications or sensor networks. UWB technology offers many unique features such as broad bandwidth, low power, accurate position location capabilities, etc. This research focuses on the RFIC front-end hardware design issues for proposed UWB transmitters. Two different methods of multiband frequency generation ----- using switched capacitor VCO tanks and frequency mixing with single sideband mixers ----- are explored in great detail. To generate the required UWB signals, pulse generators are designed and integrated into the transmitter chips. The first prototype UWB transmitter is designed in Freescale Semiconductor 0.18Î¼m SiGe BiCMOS technology for operation over three 500 MHz bands at center frequencies of 4.6/6.4/8.0 GHz, and generates pulses supporting differential BPSK modulation. The transmitter output frequency is controlled by a two-bit code which sets the state of a switched capacitor tank array for coarse tuning of the VCO. While selecting between the different bands, the transmitter is capable of settling and re-transmitting in less than 0.7Î¼s using an integrated, wide band phase-locked loop (PLL). Various issues such as mismatch/inaccuracy of the pulses and high power consumption of the prescaler were identified during the first design and were addressed in subsequent design revisions. The pulse generator is a critical part of the proposed UWB transmitter. The initial pulse generator design used CMOS delay lines and logic gates to synthesize the required pulse bandwidth; however this approach suffered from inaccurate pulse timing control due to delay time sensitivity to device modelling and process variations. Subsequently, a novel pulse generator design capable of achieving accurate timing control was implemented using digital logic and a fixed oscillator frequency to provide timing information, integrated into a modified transmitter circuit, and subsequently fabricated in Jazz Semiconductor's 0.18Î¼m CA18 RFCMOS process. Experimental results confirm the generation of accurate one-nanosecond pulses. Finally, a new multiband UWB transmitter based on a new single sideband (SSB) resistive mixer with superior linearity and zero static power consumption was also designed and fabricated using Jazz CA13 0.13Î¼m RF CMOS process. This design is based on a fixed frequency phase-locked VCO and generates different bands through frequency mixing. In the prototype design, two additional carrier frequencies are generated from the VCO center frequency (5 GHz) by mixing it with its output divided-by-4 (1.25 GHz). By switching the relative I/Q phases of the LO/IF inputs to this single side band mixer, either the upper side band (6.25 GHz) or lower side band (3.75 GHz) frequency is selected at the mixer output, while the other sideband is rejected. Simulation results show that the transmitter is capable of generating the desired carrier frequencies while suppressing the image component by more than 40 dB. Overall, this work has explored various aspects of UWB transmitter design and implementations in fully integrated silicon chips. The major contributions of this work include: proposed hardware architectures for pulse-based multiband UWB transmitters; implemented a fully integrated multiband UWB transmitter with embedded phase-locked switched-tank VCO capable of wide frequency tuning; demonstrated an all digital pulse generator capable of generating accurate one-nanosecond pulse trains in the presence of various mismatches; and investigated resistive SSB mixer topologies and their implementation in a multiband UWB generation architecture.
Ph. D.

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Rosales, Marc. « Study of SiGe HPT for radio over fiber applications ». Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1101/document.

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Ce travail de thèse présente le développement de phototransistors bipolaires à hétérojonction (HPT) SiGe/Si mis en œuvre dans une technologie de processus 80GHz SiGe bipolaire pour des applications de transmission Radio-sur-Fibre. Le cas particuliers d'un réseau domestique sans fil à infrastructure optique est considéré pour lequel le critère de coût est prépondérant. Le fonctionnement des ce HPT SiGe/Si est étudié sous une longueur d'onde optique de 850 nm en exploitant des fibres optique multimode (MMF) suffisantes pour les besoins de bande passante dans un environnement de réseau domestique. Le HPT SiGe/Si est également développé dans l'objectif de permettre une intégration combiné du photorécepteur et circuit intégré monolithiquement, conduisant à des structures de type Opto-electronic Microwave Monolithically Integrated Circuit (OE-MMIC), visant à poursuivre l'intégration et la réduction des cours. Deux topologies ont été explorées principalement: 1) une topologie avec élargissement de la base et du collecteur (xBC HPT) et 2) une topologie avec élargissement des trois régions de base, émetteur et collecteur simultanément (xEBC HPT). Des variations technologies ont été réalisées et analysées en détail, à la fois en terme de couches verticales que de dessin de masque (layout). Les mesures ont démontré la validité technologique de chacune de ces approches, et permis d'isoler l'impact sur les performances statiques et dynamiques de chacune de ces couches. Une solution de type xEBC se montre ainsi préférable pour le cas de composants de petites dimensions inférieure à 50x50µm², dans la bande du GHz. Les phototransistors sont développés dans une configuration à trois terminaux (3T-HPT). Le type de polarisation de la base du HPT influe également sur la responsivité du phototransistor. Une polarisation de courant constant (CC) démontre une plus grande responsivité par rapport au cas d'une polarisation en tension ( CV). Une analyse détaillée montre aussi les différences de responsivité mesurées en continue et celles mesurées en basse fréquence à 50MHz. La connexion de base permet également de varier l'impédance de charge présentée sur celle-ci. La théorie de l'adaptation des phototransistors est rappelée. L'effet de différentes impédances de base sont étudiées par la simulation et la mesure des circuits réalisés technologiquement. L'intégration du phototransistor au sein d'un circuit élémentaire est enfin explorée. Différentes configurations de paires HPT - HBT sont étudiées, formant des circuits élémentaires. Des caractérisations expérimentales permettent de vérifier l'amélioration apportées par ces topologies par rapport au phototransistor unique. Enfin, un phototransistor SiGe en configuraiton 2T-HPT est utilisé et intégré avec succès pour la première fois au sein d'un module de type Receiving Optical Sub Assembly (ROSA) pour la mise au point d'une transmission Radio-sur-Fibre multiGigabit par seconde pour un réseau domestique
This research is focused on the study of silicon germanium based heterojunction bipolar phototransistors (SiGe HPTs) implemented in an 80GHz SiGe Bipolar process technology. It's application in a radio over fiber system for home area networks are investigated. RoF for Home area networks are envisioned to implemented with a minimal system cost. Operation at 850nm is identified as a critical parameter to achieve this goal. Low cost off the shelf optical components are readily available at this wavelength. The use of multi mode fibers (MMF) as opposed to higher cost single mode fiber (SMF) is sufficient for the bandwidth requirements in a home network environment. A monolithically integrated OE receiver chip would help in the overall reduction of the system cost by having the optical detector in the same chip with the electronic circuits. We have designed and implemented three terminal HPT (3T-HPT) structures. The two main groups of the HPT structures are: 1) HPTs with extended Base and Collector regions (xBC HPT) and 2) HPTs with extended Emitter, Base and Collector regions (xEBC HPT). Variations to improve optical coupling the though optimizations in the vertical stack and lateral size of the HPT. The measurements and characterization showed that all the structures are compatible with the process technology. The type of biasing used in the base of the HPT also influences the HPT performance. A constant current (CC) bias has higher extracted DC responsivity as compared to a constant voltage (CV) bias. The effects of the different passive base loads on the HPT responsivity are studied through simulation and measurement of fabricated circuits. The impedance presented on the base has a great influence on the HPT responsivity. The performance of an HPT as circuit component is studied using different HPT-HBT pair configurations. Tests and measurements verify that improvement in the classical transistor pair configurations are also present in the opto microwave response of the HPT-HBT pair. Finally, SiGe hpt is used in the development of a ROSA module for a radio over fiber systems for home area network

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Choudhary, Vipin. « Nondestructive testing and antenna measurements using UWB radar in industrial applications ». Licentiate thesis, KTH, Teknisk informationsvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-291129.

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Many industries are rapidly substituting the manual test operations and move towards automated operations using modern technologies.Modern technologies such as digital cameras, sonic sensors, infrared sensors, and radar and lidar systems are used for non-destructive testingoperations. Among all the different sensors, radar systems have theability to penetrate built structures (dielectric materials), which makes them flexible and suitable for a wide range of industrial and military applications in non-destructive sensing. Such examples are the detection of damages in goods manufacturing, monitoring the health of manystructures, object detection through the wall for security purposes, etc.In particular, ultra-wide-band (UWB) radar systems are beneficial inproviding high measurement accuracy and simultaneously reduced sensitivityto passive interference (such as rain, smoke, mist etc.), immunity to external radiation and noise.The objectives of this thesis are: I) to investigate electrically small concealed structures using synthetic aperture radar (SAR), II) to determinethe complex refractive index of objects using an UWB radar system,and III) to answer to the question how we can reduce the mutual coupling (cross talk) in an UWB radar system with collocated transmitand receive antennae. In objective I, the aim is non-destructive testing of built structures, such as in concrete slab manufacturing or for use in the renovation process. In addition electrically small periodic meshes,and their orientation, could not be distinguished in conventional SAR images. The proposed polarimetric analysis method demonstrates the usefulness of the singular value decomposition (SVD) using back projection algorithm (BPA) in extracting information about shape and for classifying an electrically small object. Further in this thesis for objective II, a new method for determining the complex refractive index (or equivalently the complex relative permittivity) of objects with planar interfaces is presented. The proposed method is relatively insensitive to hardware-impairments such as frequency-dependence of antennas and analog front end. The objects can be finite in size and at a finite distance. The limits in size and distance for the method to be valid are experimentally investigated. Hence, the method is designed for industrial in-line measurements onobjects on conveyor belts. Furthermore, in the following parts of this thesis −objective III− we investigate and show how a microwave metamaterial based absorber can be used to improve the performance of aradar system for short range applications, when positioned between the transmit and receive antennas. As results, the error in estimated target distance is reduced and clutter reduction is improved.
Många branscher ersätter snabbt de manuella testoperationerna och går mot automatiserad drift med modern teknik. Modern teknik såsom digitalkameror, soniska sensorer, infraröda sensorer och radar och lidarsystem används för i icke-förstörande tester. Bland alla olika sensorerhar radarsystem förmågan att tränga igenom byggda strukturer (dielektriskmaterial), vilket gör dem flexibla och lämpliga för ett brettspektrum av industriella och militära applikationer vid icke-förstörande avkänning. Sådana exempel är upptäckt av skador vid tillverkning av varor, övervakning av hälsa hos många strukturer, detektering av objekt genom väggen av säkerhetsskäl etc. Speciellt är radarsystem med ultrabredband (UWB) fördelaktiga då de ger hög mätnoggrannhet och samtidigt minskad känslighet mot passiva störningar (såsom regn, rök,dimma etc.), och immunitet mot yttre strålning och buller. Syftet med denna avhandling är : I) att undersöka elektriskt små dolda struktur med syntetisk bländaradar (SAR), II) att bestämma komplex brytningsindex för objekt som använder UWB radarsystem, ochIII) att svar på frågan hur vi kan minska den ömsesidiga kopplingen(överhörning) i ett UWB radarsystem med sändar- och mottagarantenner nära varandra. I mål I, är målet icke-förstörande provning avbyggda struktures såsom vid tillverkning av betongplattor eller vid renovering. I tillägg kunde inte elektriskt små strukturer och deras inre struktur urskiljas i konventionella SAR-bilder. Den föreslagna polarimetriskaanalysmetoden visar på hur användbar singulärvärdesuppdelning(SVD) med bakåtprojektion (BPA) är för att få information om och för att klassificera elektriskt små objekt.Vidare i denna avhandling visas för mål II en ny metod för att bestämma komplexa brytningsindex (eller motsvarande komplexa relativa permittiviteten) hos objekt med plana ytor. Den föreslagna metoden är relativt okänslig för svagheter hos hårdvaran, såsom frekvensberoende hos antennener och analog front-end. Objekten kan vara av ändlig storlek och på ändligt avstånd. Begränsningarna i storlek och avstånd för metoden att vara giltig undersöktes experimentellt. Sålunda är metoden utformad för industriella mätningar på föremål på transportband. I de följande delarna av avhandlingen - mål III - undersöker och visar vi dessutom hur en absorbator för mikrovågor, baserad på metamaterial, kan användas för att förbättra prestanda hos ett radarsystem för korta avstånd, när absorbatorn placeras mellan sändar- och mottagantenner. Resultatet blir att felet i det bestämda avståndet till målet minskar och undertryckning av klotter ökar.

QC 20210309

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Livres sur le sujet "UWB APPLICATIONS"

Yunker, John. Ultra-wideband (UWB) unleashed : What operators need to know about UWB applications and vendors. [Cambridge, Mass.] : Pyramid Research, 2003.

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Lembrikov, Boris. Novel application of the UWB technologies. Rijeka, Croatia : InTech, 2012.

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Webb, Ann R. UVB instrumentation and applications. Amsterdam : Gordon and Breach Science Publishers, 1998.

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Graphics, touch, sound and usb, user interface design for embedded applications. [Place of publication not identified] : LULU COM, 2014.

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Applications of Social Network Analysis, ASNA 2005 / Uwe Serdült & Volker G. Täube (Eds.). Berlin : Wissenschaftlicher Verlag Berlin, 2008.

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S, Rock N. M., Australian Institute of Geoscientists et Key Centre for Teaching and Research in Strategic Mineral Deposits., dir. Geological applications of geographic information systems (GIS) : Papers presented at a joint AIG-UWA Key Centre seminar, Perth, 6-7 July 1992. North Sydney : Australian Institute of Geoscientists & Key Centre for Strategic Mineral Deposits, UWA, 1992.

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Oppermann, Ian, Matti Hämäläinen et Jari Iinatti, dir. UWB Theory and Applications. Wiley, 2004. http://dx.doi.org/10.1002/0470869194.

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Oppermann, Ian, Matti Hämäläinen et Jari Iinatti. Uwb : Theory and Applications. Wiley & Sons, Incorporated, John, 2007.

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(Editor), Ian Oppermann, Matti Hämäläinen (Editor) et Jari Iinatti (Editor), dir. UWB : Theory and Applications. Wiley, 2004.

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Oppermann, Ian, Matti Hämäläinen et Jari Iinatti. UWB : Theory and Applications. Wiley & Sons, Incorporated, John, 2005.

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Chapitres de livres sur le sujet "UWB APPLICATIONS"

Matila, Tommi, Marja Kosamo, Tero Patana, Pekka Jakkula, Taavi Hirvonen et Ian Oppermann. « UWB Antennas ». Dans UWB Theory and Applications, 129–56. Chichester, UK : John Wiley & Sons, Ltd, 2005. http://dx.doi.org/10.1002/0470869194.ch6.

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Hämäläinen, Matti, Veikkò Hovinen et Lassi Hentilä. « UWB Channel Models ». Dans UWB Theory and Applications, 9–38. Chichester, UK : John Wiley & Sons, Ltd, 2005. http://dx.doi.org/10.1002/0470869194.ch2.

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Chen, Zhi Ning, et Terence S. P. See. « Antennas for UWB Applications ». Dans Antennas for Portable Devices, 231–86. Chichester, UK : John Wiley & Sons, Ltd, 2007. http://dx.doi.org/10.1002/9780470319642.ch7.

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Sivalingam, Krishna M., et Aniruddha Rangnekar. « UWB Networks and Applications ». Dans Ultra Wideband Wireless Communication, 297–313. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2005. http://dx.doi.org/10.1002/9780470042397.ch13.

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Oppermann, Ian, Matti Hämäläinen et Jari Iinatti. « Introduction ». Dans UWB Theory and Applications, 1–8. Chichester, UK : John Wiley & Sons, Ltd, 2005. http://dx.doi.org/10.1002/0470869194.ch1.

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Hämäläinen, Matti, Raffaello Tesi et Ian Oppermann. « Modulation Schemes ». Dans UWB Theory and Applications, 39–65. Chichester, UK : John Wiley & Sons, Ltd, 2005. http://dx.doi.org/10.1002/0470869194.ch3.

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Hämäläinen, Matti, Jari Iinatti, Raffaello Tesi, Simone Soderi et Alberto Rabbachin. « Receiver Structures ». Dans UWB Theory and Applications, 67–85. Chichester, UK : John Wiley & Sons, Ltd, 2005. http://dx.doi.org/10.1002/0470869194.ch4.

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Tiuraniemi, Sakari, et Ian Oppermann. « Integrated Circuit Topologies ». Dans UWB Theory and Applications, 87–127. Chichester, UK : John Wiley & Sons, Ltd, 2005. http://dx.doi.org/10.1002/0470869194.ch5.

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Celentano, Ulrico, et Ian Oppermann. « Medium Access Control ». Dans UWB Theory and Applications, 157–73. Chichester, UK : John Wiley & Sons, Ltd, 2005. http://dx.doi.org/10.1002/0470869194.ch7.

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Yu, Keqen, et Ian Oppermann. « Positioning ». Dans UWB Theory and Applications, 175–96. Chichester, UK : John Wiley & Sons, Ltd, 2005. http://dx.doi.org/10.1002/0470869194.ch8.

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Actes de conférences sur le sujet "UWB APPLICATIONS"

Bhattacharjee, Sweta, Sushmita Saha, Arkya Santra, Jeet Banerjee et Rowdra Ghatak. « A UWB Antenna with Bandwidth Enhancement for 5G, IoT, USB-dongle and UWB wireless applications ». Dans 2019 IEEE Region 10 Symposium (TENSYMP). IEEE, 2019. http://dx.doi.org/10.1109/tensymp46218.2019.8971321.

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Chen. Ming-Hung et Tien-Min. Chuang. « Miniature antenna for UWB applications ». Dans 2012 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference (CSQRWC). IEEE, 2012. http://dx.doi.org/10.1109/csqrwc.2012.6294970.

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Yarovoy, A., et L. Ligthart. « UWB Radars for Chalenging Applications ». Dans 2006 3rd International Conference on Ultrawideband and Ultrashort Impulse Signals. IEEE, 2006. http://dx.doi.org/10.1109/uwbus.2006.307157.

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Knochel, Reinhard, Alexander Gulck, Frank Daschner et Ove Schimmer. « UWB-Sensors for Industrial Applications ». Dans 2007 IEEE International Conference on Ultra-Wideband. IEEE, 2007. http://dx.doi.org/10.1109/icuwb.2007.4381002.

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Hamalainen, Matti, Pekka Pirinen, Jari Iinatti et Attaphongse Taparugssanagorn. « UWB supporting medical ICT applications ». Dans 2008 IEEE International Conference on Ultra-Wideband (ICUWB). IEEE, 2008. http://dx.doi.org/10.1109/icuwb.2008.4653405.

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Chang, Dau-Chyrh. « UWB Antennas and Their Applications ». Dans 2008 International Workshop on Antenna Technology "Small Antennas and Novel Metamaterials" (iWAT). IEEE, 2008. http://dx.doi.org/10.1109/iwat.2008.4511279.

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Skrebtsov, Andrey, Admir Burnic, Dong Xu, Andreas Waadt et Peter Jung. « UWB applications in public transport ». Dans 2011 International Conference on Communications, Computing and Control Applications (CCCA). IEEE, 2011. http://dx.doi.org/10.1109/ccca.2011.6031519.

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Wen-Fan Chen, Zong-Sian Ye, Jian-Ming Wu et Chih-Yu Huang. « Slot antennas for UWB applications ». Dans 2008 Asia Pacific Microwave Conference. IEEE, 2008. http://dx.doi.org/10.1109/apmc.2008.4958142.

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Hernandez, Marco, et Ryuji Kohno. « UWB systems for body area networks ». Dans Applications (ISSSTA). IEEE, 2010. http://dx.doi.org/10.1109/isssta.2010.5653565.

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Ghosh, D., et P. K. Sahu. « UWB in healthcare ». Dans 2016 International Conference on Electromagnetics in Advanced Applications (ICEAA). IEEE, 2016. http://dx.doi.org/10.1109/iceaa.2016.7731489.

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Rapports d'organisations sur le sujet "UWB APPLICATIONS"

Hutchinson, Bradley C. Development of power spiral antenna for UWB applications. Office of Scientific and Technical Information (OSTI), février 2014. http://dx.doi.org/10.2172/1124899.

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Qiu, Robert C., Nan Guo, Zhen Hu, Peng Zhang, Yu Song, Amanpreet S. Saini et Corey Cooke. Time-Reversal Based Range Extension Technique for Ultra-Wideband (UWB) Sensors and Applications in Tactical Communications and Networking. Fort Belvoir, VA : Defense Technical Information Center, juillet 2008. http://dx.doi.org/10.21236/ada485645.

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Qui, Robert C., Nan Guo, Yu Song, Peng Zhang et Zhen Hu. Time-Reversal Based Range Extension Technique for Ultra-Wideband (UWB) Sensors and Applications in Tactical Communications and Networking. Fort Belvoir, VA : Defense Technical Information Center, janvier 2009. http://dx.doi.org/10.21236/ada498474.

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Qiu, Robert C., Nan T. Guo, Yu Song, Peng P. Zhang et Zhen E. Hu. Time-Reversal Based Range Extension Technique for Ultra-Wideband (UWB) Sensors and Applications in Tactical Communications and Networking. Fort Belvoir, VA : Defense Technical Information Center, juillet 2009. http://dx.doi.org/10.21236/ada507855.

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Qiu, Robert C., Nan Guo, Yu Song, Peng Zhang et Zhen Hu. Time-Reversal Based Range Extension Technique for Ultra-Wideband (UWB) Sensors and Applications in Tactical Communications and Networking. Fort Belvoir, VA : Defense Technical Information Center, octobre 2009. http://dx.doi.org/10.21236/ada513109.

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Qiu, Robert C., Nan T. Guo, Qiang J. Zhang, Chenming J. Zhou, Zhen E. Hu, Peng P. Zhang, Dalwinder Singh et Corey Cooke. Time-Reversal Based Range Extension Technique for Ultra-Wideband (UWB) Sensors and Applications in Tactical Communications and Networking. Fort Belvoir, VA : Defense Technical Information Center, juillet 2007. http://dx.doi.org/10.21236/ada472443.

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Qiu, Robert C. Time-Reversal Based Range Extension Technique for Ultra-wideband (UWB) Sensors and Applications in Tactical Communications and Networking. Fort Belvoir, VA : Defense Technical Information Center, avril 2008. http://dx.doi.org/10.21236/ada480775.

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VanderNoot, Victoria A., Brent L. Haroldsen, Ronald F. Renzi et Isaac R. Shokair. Preliminary performance assessment of biotoxin detection for UWS applications using a MicroChemLab device. Office of Scientific and Technical Information (OSTI), mars 2010. http://dx.doi.org/10.2172/984154.

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Hornby, Amanda, et Emilie Vrbancic. Library Impact Practice Brief : Library Outreach Assessment. Association of Research Libraries, septembre 2021. http://dx.doi.org/10.29242/brief.uwashington2021.

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As part of ARL’s Research Library Impact Framework initiative, the University of Washington (UW) Odegaard Library’s Undergraduate Student Success Team designed an assessment framework for outreach to undergraduates. This practice brief describes the UW team’s outreach and assessment planning processes, the qualitative and quantitative assessment methods employed, the results of their assessment program, the lessons learned, and the best practices that emerged over several years and several iterations of conducting library outreach assessment. The brief presents both long-term reflections and most recent applications between 2016–2021.

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Kong, Zhihao, et Na Lu. Determining Optimal Traffic Opening Time Through Concrete Strength Monitoring : Wireless Sensing. Purdue University, 2023. http://dx.doi.org/10.5703/1288284317613.

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Construction and concrete production are time-sensitive and fast-paced; as such, it is crucial to monitor the in-place strength development of concrete structures in real-time. Existing concrete strength testing methods, such as the traditional hydraulic compression method specified by ASTM C 39 and the maturity method specified by ASTM C 1074, are labor-intensive, time consuming, and difficult to implement in the field. INDOT’s previous research (SPR-4210) on the electromechanical impedance (EMI) technique has established its feasibility for monitoring in-situ concrete strength to determine the optimal traffic opening time. However, limitations of the data acquisition and communication systems have significantly hindered the technology’s adoption for practical applications. Furthermore, the packaging of piezoelectric sensor needs to be improved to enable robust performance and better signal quality. In this project, a wireless concrete sensor with a data transmission system was developed. It was comprised of an innovated EMI sensor and miniaturized datalogger with both wireless transmission and USB module. A cloud-based platform for data storage and computation was established, which provides the real time data visualization access to general users and data access to machine learning and data mining developers. Furthermore, field implementations were performed to prove the functionality of the innovated EMI sensor and wireless sensing system for real-time and in-place concrete strength monitoring. This project will benefit the DOTs in areas like construction, operation, and maintenance scheduling and asset management by delivering applicable concrete strength monitoring solutions.

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