Tesis: "RFID UHF passive"

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Contractor, Bhavik. "Two Dimensional Localization of Passive UHF RFID Tags." Wright State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=wright1229465514.

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Wu, Xunxun. "Design of Passive UHF RFID Tag Antennas and Industry Application." Thesis, Högskolan i Gävle, Institutionen för teknik och byggd miljö, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-8052.

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Nowadays, there is a growing demand for reliable assets security and management in various industries. The company SolarWave is eager to implement a comprehensive security system to produce active protection for their expensive product: solar panels. This security system is not only including assets tracking, monitoring but also combined with a control system, which is used to binary control a switch of solar panel to be on in presence of the correct ID and off in absence of the correct ID. One of the technologies that made this concept viable is known as Radio Frequency Identification (RFID). The thesis project is a sub-project in the development project whose content is mentioned as above. It contains two main parts. One is the system solution for the company. The other is RFID tag design which is in parallel with the company solution in order to reach a scientific level of a master thesis. In this thesis, I systematically analyze the operating mechanism and characteristics of RFID, and propose both active and passive RFID solutions for the company. And I also suggest an alternative radio technology ZigBee which can be used instead or as a complement to RFID. Meanwhile, I propose two designs of RFID tag according to the specification of the solar panel. One is modified meandering antenna. This kind of antenna is very effective and popular in RFID tag design in order to minimize the size of antenna. The other is inductively coupled loop antenna. It is a very useful method for conjugate matching in RFID tag antenna. The required input resistance and reactance can be achieved separately by choosing appropriate geometry parameters. It makes the antenna easier to match to the tag chips. Both the RFID antenna designs are simulated on Ansoft HFSS 12.

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3

Cremer, Markus. "Digital beamforming techniques for passive UHF RFID tag localization." Thesis, London South Bank University, 2016. http://researchopen.lsbu.ac.uk/1819/.

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Radio-frequency identification (RFID) technology is on the way to substitute traditional bar codes in many fields of application. Especially the availability of passive ultra-high frequency (UHF) RFID transponders (or tags) in the frequency band between 860 MHz and 960 MHz has fostered the global application in supply chain management. However, the full potential of these systems will only be exploited if the identification of objects is complemented by accurate and robust localization. Passive UHF RFID tags are cost-effective, very small, extremely lightweight, maintenancefree, rugged and can be produced as adhesive labels that can be attached to almost any object. Worldwide standards and frequency regulations have been established and a wide infrastructure of identification systems is operated today. However, the passive nature of the technology requires a simple communication protocol which results in two major limitations with respect to its use for localization purposes: the small signal bandwidth and the small allocated frequency bandwidth. In the presence of multipath reflections, these limitations reduce the achievable localization accuracy and reliability. Thus, new methods have to be found to realize passive UHF RFID localization systems which provide sufficient performance in typical multipath situations. In this thesis, an enhanced transmission channel model for passive UHF RFID localization systems has been proposed which allows an accurate estimation of the channel behaviour to multipath. It has been used to design a novel simulation environment and to identify three solutions to minimize multipath interference: a) by varying the channel interface parameters, b) by applying diversity techniques, c) by installation of UHF absorbers. Based on the enhanced channel model, a new method for tag readability prediction with high reliability has been introduced. Furthermore, a novel way to rate the magnitude of multipath interference has been proposed. A digital receiver beamforming localization method has been presented which uses the Root MUSIC algorithm for angulation of a target tag and multipath reducing techniques for an optimum localization performance. A new multiangulation algorithm has been proposed to enable the application of diversity techniques. A novel transmitter beamforming localization approach has been presented which exploits the precisely defined response threshold of passive tags in order to achieve high robustness against multipath. The basic technique has been improved significantly with respect to angular accuracy and processing times. Novel experimental testbeds for receiver and transmitter beamforming have been designed, built and used for verification of the localization performance in real-world measurements. All the improvements achieved contribute to an enhancement of the accuracy and especially the robustness of passive UHF RFID localization systems in multipath environments which is the main focus of this research.

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4

Sajal, Sayeed Zebaul Haque. "Low-Cost Passive UHF RFID Tags on Paper Substrates." Thesis, North Dakota State University, 2014. https://hdl.handle.net/10365/27426.

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To reduce the significant cost in the widespread deployment of UHF radio frequency identification (RFID) systems, an UHF RFID tag design is presented on paper substrates. The design is based on meander-line miniaturization techniques and open complementary split ring resonator (OCSRR) elements that reduce required conducting materials by 30%. Another passive UHF RFID tag is designed to sense the moisture based on the antenna's polarization. An inexpensive paper substrate and copper layer are used for flexibility and low-cost. The key characteristic of this design is the sensitivity of the antenna's polarization on the passive RFID tag to the moisture content in the paper substrate. In simulations, the antenna is circularly-polarized when the substrate is dry (?r = 2.38) and is linearly-polarized when the substrate is wet (?r = 35.35). It was shown that the expected read-ranges and desired performance could be achieved reducing the over-all cost of the both designs.

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5

Wolk, Jonathan E. "Graphical real-time simulation tool for passive UHF RFID environments." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33381.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005. Includes bibliographical references (p. 115-117). In this thesis, I present the design and implementation of a real-time simulation tool, RFID Vis, that is used to simulate a UHF RFID environment. The simulation tool simulates environments containing to pallets of cases as is common in parts of the supply chain. The simulation tool consists of two parts, a graphical front end which interfaces with the user as well as displays the electromagnetic power present in a given volume of space in an intuitive manner and an electromagnetics simulation engine which takes care of all the electromagnetic calculations and approximations. The simulation tool is written in C++ using Microsoft DirectX 9.0 to interface with the graphics hardware. RFID Vis enables users to quickly simulate a real world operating scenario providing insights and building intuition. by Jonathan E. Wolk. M.Eng.

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6

Gao, Jinlan. "Antenna-based passive UHF RFID sensor tags : Design and application." Doctoral thesis, Mittuniversitetet, Avdelningen för elektronikkonstruktion, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-19889.

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RFID, as a low cost technology with a long life time, provides great potential for transmitting sensor data in combination with the ordinary ID number. The sensor can, for example, be integrated either in the chip or in the antenna of an RFID tag.This thesis focuses on the design of antenna-based UHF RFID sensor tags as wireless sensors at the lowest possible cost level compatible with standard communication systems in logistics. The applications of the sensor tags, in this work, mainly target remote humidity sensing. Antenna-based sensory UHF RFID tags utilize the influence that the physical or chemical parameters to be sensed have on the electrical properties of a tag antenna. The variations of the electrical properties of the tag antenna can be measured in many ways. In the thesis, a description is provided as to how these variations are normally measured by an RFID reader without any other assistant equipment. Three structures of antenna-based RFID sensor tags are presented with detailed characterizations. The first one utilizes the sensitivity of the antenna to the surrounding environment to construct RFID sensor tags, where a moisture absorbing layer providing wetness/humidity sensor functionality is placed on the RFID tag antenna to increase the humidity concentration surrounding the tag antenna and the thesis describes how to overcome certain limitations due to disturbances associated with background materials. The second structure directly integrates a small resistive sensor element into an RFID tag antenna and the sensor information can thus modulate the antenna performance by means of galvanic contact. The third structure embeds a small resistive sensor element into a loop which is positioned on top of the tag antenna and the sensor information can thus modulate the performance of the tag antenna by means of electromagnetic coupling. Both theoretical analysis and fullwave simulations are presented for the latter two sensor tag structures in order to characterize the performance of the sensor tags. An ultra-low cost printed humidity sensor with memory functionality is also designed and thoroughly characterized for integration into RFID tag antennas by means of galvanic contact or electromagnetic coupling. The sensor is a 1-bit write-once-read-many (WORM) memory printed using conductive ink. The WORM works as a pure resistive humidity sensor and can provide information about an historical event. The WORM sensor is presented by introducing its geometry, characterizingits behavior in humidity and explaining the principle of the humidity effect. The WORM sensors are also integrated into the RFID tags by means of both galvanic contact and electromagnetic coupling in order to experimentally verify the two concepts. To lower the cost of the RFID tags, the antennas are normally printed, milledor etched on flexible substrates using low-cost high-speed manufacturing methods which in some cases cause a high degree of edge roughness. The edge roughness will affect the behavior of the antenna, however, the characteristics of edge roughness on RFID antennas have previously not received any significant attention. Unforeseen antenna behavior can affect the antenna-based sensor tags, thus the influence of edge roughness is also investigated in the thesis.

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Shao, Shuai. "Design and Optimization of Passive UHF RFID Tag Antenna for Mounting on or inside Material Layers." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1435758466.

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Bhattacharyya, Rahul. "Low-Cost, Passive UHF RFID Tag Antenna-Based Sensors for Pervasive Sensing Applications." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/73791.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2012. Cataloged from PDF version of thesis. Includes bibliographical references (p. 161-170). In the future, large-scale sensor deployment would enable many areas such as infrastructure condition monitoring and supply chain management. However, many of today's wireless sensor technologies are still too expensive to meet this need. Radio Frequency IDentification (RFID) offers good potential for the development of pervasive sensors: RFID tags have a proven track record of large-scale, highly integrated deployment for object identification in the retail and consumer goods industry. Furthermore, the last decade has seen much progress in making RFID a reliable, standardized wireless communication medium with the ability to mass produce low-cost RFID tags. My thesis introduces the concept of RFID Tag Antenna-Based Sensing (RFID TABS). In this approach, a change in the sensed parameter of interest induces a controlled change in the geometry or boundary conditions of an RFID tag's antenna. The resultant change in the tag's response signal can then be detected by an RFID reader. My approach builds upon current developments in RFID technology. For instance, the manufacturing techniques for the mass production of low-cost RFID tags can be used for pervasive tag-sensor development. My thesis examines TABS in a two-pronged approach: First, I demonstrate how three fundamental tag and reader signal properties can be used for sensing and propose three classes of TABS: -- Amplitude Modifying (AM) TABS use RFID reader transmitted power and tag response power for sensing. I illustrate proof of concept using a displacement sensor. I demonstrate that both these power metrics can be used to reliably measure structural displacement to a precision of 2.5 mm using commercial RFID tags. -- Frequency Modifying (FM) TABS relate changes in the sensed parameter to a shift in the tag's optimal operating frequency - the carrier frequency for which the tag is best tuned to respond to the reader. I demonstrate proof of concept using a temperature threshold sensor - the crossing of a design temperature threshold results in a shift in the sensor's optimal operating frequency. I demonstrate that the sensor works reliably over a 3 m read range and in different environmental conditions. -- Phase Modifying (PM) TABS use tag backscatter phase for sensing. I provide a brief summary of the factors influencing RF phase and outline the design for a PM TABS fluid level sensor that uses RFID tag response phase to detect the presence or absence of fluid in a beverage glass. I highlight the challenges in the practical implementation of this approach by demonstrating the sensitivity of RFID tag phase to three extraneous factors. Second, I introduce the concept of Non-Electric Memory to record short timescale threshold crossovers in the sensed parameter that may occur when the tag-sensor is unpowered. When information about, rather than the exact time of, the threshold occurrence is sufficient, non-electric memory provides a solution. I demonstrate how non-electric memory can be integrated into sensor design at minimal added cost. In the proof of concept of a temperature threshold sensor, I design a thermally actuated shape memory polymer switch to permanently change the electrical properties of an RFID tag when the temperature threshold is crossed. I demonstrate that the design works reliably over a read range of 3 m and is independent of the material on which the sensor is deployed. In summary, this thesis demonstrates how an RFID tag can be adapted for low cost, pervasive sensing. Sensor prototypes illustrate proof of concept in three application areas. Extensions to two other applications are also discussed. by Rahul Bhattacharyya. Ph.D.

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9

Li, Tzu Hao. "Open Platform Semi-Passive Ultra High Frenquency Radio Frequency Identi." Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/20060.

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Radio frequency identi cation (RFID) is a rapidly emerging technology that enables au- tomatic remote identi cation of objects. Passive and semi-passive RFID systems can be distinguished from other forms of wireless systems, because the RFID tags (transponders) communicate by way of backscatter. In addition, passive tags derive their energy from the RF energy emitted by the reader. RFID technology can provide a fully automated data capture and analysis system. Compared to a passive RFID system, an open platform semi-passive UHF RFID tag can provide identi cation, security, low-power (compared to a wireless sensor net- work(WSN)), medium range and medium processing speed. However, the eld of semi- passive RFID is still under development, and has yet there are no open development platforms available. This thesis develops a prototype of a semi-passive UHF RFID tag that is compatible with the leading UHF RFID standard EPCglobal Gen 2 Class 1. I alsot has the exible I2C and analog digital converter(ADC) interface, which allows the additional of external analog and digital sensors. The sensor data can be read by microcontroller and stored at memory. Standard reader can get sensor data by sending QUERY and READ command to tag. Test results of our open platform semi-passive UHF RFID tag demonstrated that it can achieve a read rate above 50% when an open platform semi-passive UHF RFID tag is placed four meters from the reader antenna and the reader output power is set to 21 dBm. In addition, the proposed semi-passive open platform RFID tag consumes very little power (4.9 mA in 2V with system frequency set to 8MHz).

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Gao, Bo. "Passive UHF RFID tag using electromagnetic band gap (EBG) material for metallic objects tracking /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?MECH%202007%20GAO.

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Proffitt, Donnie E. II. "EXPERIMENTAL INVESTIGATION TO INFORM OPTIMAL CONFIGURATIONS FOR DYNAMIC NEAR-FIELD PASSIVE UHF RFID SYSTEMS." UKnowledge, 2013. http://uknowledge.uky.edu/me_etds/29.

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RFID has been characterized as a “disruptive technology” that has the potential to revolutionize numerous key sectors. A key advantage of passive RFID applications is the ability to wirelessly transmit automatic identification and related information using very little power. This paper presents an experimental investigation to inform the optimal configuration for programming passive ultra-high frequency (UHF) RFID media in dynamic applications. Dynamic programming solutions must be designed around the tag’s functionality, the physical programming configuration and environment. In this investigation, we present a methodology to determine an optimal configuration to maximize the systems programming efficiency for dynamic applications.

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12

Dong, Haobo (Haobo Jack). "Passive EPC Class 1 Gen 2 UHF RFID sensor tag For health monitoring applications." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/66026.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2011. Cataloged from PDF version of thesis. Includes bibliographical references (p. 101-102). Parkinson's disease (PD) is a chronic and degenerative condition that affects millions of Americans. Current approach of PD evaluation, diagnosis, and treatment is mainly qualitative using the Unified Parkinson's Disease Rating Scale (UPDRS) or the Hoehn and Yahr scale. Assessment of the efficacy of the drugs used is difficult and subjective. A long-term monitoring device that can collect movement data in assisting quantitative analysis proves to be useful and needed. This thesis discusses a discrete prototype of a passive EPC Class 1 Gen 2 UHF RFID sensor tag which is a preliminary step in realizing such a monitoring device. The prototype is capable of collecting 8-bit sensor (temperature, inertial, etc) data and transmits it in real-time through a RFID backscatter link to an UHF reader. It is shown that the device can achieve a read distance up to 3 meters at 5 reads/s and a max data rate of about 640 Kbps. by Haobo (Jack) Dong. S.M.

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Atojoko, Achimugu A. "Design and Modelling of Passive UHF RFID Tags for Energy Efficient Liquid Level Detection Applications. A study of various techniques in the design, modelling, optimisation and deployment of RFID reader and passive UHF RFID tags to achieve effective performance for liquid sensing applications." Thesis, University of Bradford, 2016. http://hdl.handle.net/10454/15906.

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Sewer and oil pipeline spillage issues have become major causes of pollution in urban and rural areas usually caused by blockages in the water storage and drainage system, and oil spillage of underground oil pipelines. An effective way of avoiding this problem will be by deploying some mechanism to monitor these installations at each point in time and reporting unusual liquid activity to the relevant authorities for prompt action to avoid a flooding or spillage occurrence. This research work presents a low cost energy efficient liquid level monitoring technique using Radio Frequency Identification Technology. Passive UHF RFID tags have been designed, modelled and optimized. A simple rectangular tag, the P-shaped tag and S-shaped tag with UHF band frequency of operation (850-950 MHz) has been designed and modelled. Detailed parametric analysis of the rectangular tag is made and the optimised design results analysed and presented in HFSS and Matlab. The optimised rectangular tag designs are then deployed as level sensors in a gully pot. Identical tags were deployed to detect 4 distinct levels in alternate positions and a few inches in seperation distance within the gully pot height (Low, Mid, High and Ultra high). The radiation characteristic of tag sensors in deployment as modelled on HFSS is observed to show consistent performance with application requirements. An in-manhole chamber antenna for an underground communication system is analysed, designed, deployed and measured. The antenna covers dual-band impedance bandwidths (i.e. 824 to 960 MHz, and 1710 to 2170 MHz). The results show that the antenna prototype exhibits sufficient impedance bandwidth, suitable radiation characteristics, and adequate gains for the required underground wireless sensor applications. Finally, a Linearly Shifted Quadrifilar Helical Antenna (LSQHA) designed using Genetic Algorithm optimisation technique for adoption as an RFID reader antenna is proposed and investigated. The new antenna confirms coverage of the RFID bandwidth 860-960 MHz with acceptable power gain of 13.1 dBi.

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14

Liu, Ran [Verfasser]. "Mapping, Path Following, and Perception with Long Range Passive UHF RFID for Mobile Robots / Ran Liu." Aachen : Shaker, 2018. http://d-nb.info/118659019X/34.

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Flieger, Matthias Ludwig. "Entwicklung, Modellierung und Verifikation einer Dual-Feed-Antennenstruktur für leistungsfähige, passive UHF-RFID-Sensoren auf kritischen Oberflächen." Doctoral thesis, Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-120227.

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Die Weiterentwicklung klassischer, elektronischer Identifikationstechnologien leistet einen wichtigen Beitrag zum technischen Fortschritt in Industrie, Logistik und Gesundheitswesen. Die vorliegende Dissertationsschrift beschreibt die Entwicklung eines Dual-Feed-Antennendesigns für passive UHF-RFID-Transponder auf kritischen Oberflächen. Die zu Grunde liegende Antennenstruktur besteht aus einem Microstrip-Patch unter Verwendung eines verlustarmen Substratmaterials. Dieser erfährt eine Optimierung hinsichtlich seiner Lesereichweite, insbesondere auf kritischen Oberflächen. Ein Zwei-Port-Konzept mit gekoppeltem Feed-Line-Anpassnetzwerk reduziert die Anzahl benötigter, diskreter Komponenten und ermöglicht eine kostengünstige Herstellung mittels klassischer Ätzverfahren. Verschiedene Ansätze zur Modellierung und zur analytischen Berechnung der Antennenparameter werden dargestellt. Des Weiteren erfolgt eine Verifikation der Antennenstruktur anhand eines Konzepts für einen passiven Energy-Harvesting-RFID-Transponder, der zur Temperaturüberwachung in den genannten Branchen eingesetzt werden kann. Dieses Konzept schließt ein effizientes Energiemanagement mittels eines Ultra-Low-Power-Mikrocontrollers sowie Ansätze zur Energiegewinnung und -speicherung mit ein und stellt die Wahl wichtiger Systemparameter und Bauelemente anhand anwendungsspezifischer Abschätzungen dar.

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16

Rumens, Christina Victoria. "The integration of stimulus-responsive polymers into passive Ultra-High Frequency Radio Frequency Identification (UHF-RFID) sensors." Thesis, University of Kent, 2016. https://kar.kent.ac.uk/62467/.

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17

Andia, Vera Gianfranco. "Analyse et exploitation des non linéarités dans les systèmes RFID UHF passifs." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT052/document.

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Avec l'explosion de l'Internet des Objets (IoT), de nouveaux dispositifs permettant de tagguer les objets sont nécessaires afin de permettre non seulement leur identification mais aussi d'assurer des communications fiables et de nouvelles fonctionnalités comme la détection, la localisation ou la capture d'informations. Cette tendance s'appuie sur la technologie bien établie qu'est la radiofréquence par identification (RFID) et donc l'utilisation d'étiquettes (ou tags) faibles coûts et télé-alimentés. Dans ce contexte, de nombreux travaux au niveau de la couche d'application se tournent vers la mise au point de traitements logiciels complémentaires visant à produire de nouveaux types d'information. D'autres travaux visent à améliorer la couche physique avec l'objectif de miniaturiser encore le tag mais aussi de le doter de nouvelles capacités. Jusqu'à présent, il n'existe quasiment pas de travaux concernant la transmission du signal et aucun sur l'exploitation du comportement non-linéaire des puces RFID. Cette thèse vise à étudier les phénomènes non-linéaires produits lors d'une communication RFID.Dans la première partie, deux plateformes de mesure et de caractérisation spécifiques ont été développées : la première vise à observer les signaux au cours d'une communication RFID, et alors caractériser et analyser les effets liés aux phénomènes non linéaires ; la seconde permet d'effectuer différentes mesures directement sur les puces et les caractériser en termes d'impédance, production d'harmoniques et sensibilité. Ces plateformes ont permis : 1) de mettre en évidence que les fréquences harmoniques sont porteuses d'informations qui peuvent être exploitées et même offrir de nouvelles fonctionnalités ; 2) d'obtenir de nombreuses informations sur les propriétés des puces et d'en établir un modèle électrique précis ; 3) de déterminer des critères permettant d'évaluer la performance des tags dans le contexte étudié.Dans la deuxième partie, plusieurs nouveaux tags RFID ont été conçus, fabriqués, mesurés et évalués. Ces nouveaux tags fonctionnent non seulement dans la bande UHF mais aussi sont adaptés à la troisième harmonique dans la bande des microondes. Une méthodologie et des lignes directives d'aide à la conception de ce type de tags ont été établies et s'appuient sur les deux plateformes développées afin de caractériser les différents éléments. Dans un même temps, les effets liés à la fabrication ont aussi été étudiés et des études paramétriques ont permis de mettre en évidence l'effet sur les performances de la géométrie de l'antenne et du type de puce utilisée.Dans une troisième partie, les études se sont focalisées à exploiter les effets non-linéaires des dispositifs de redressement. L'idée générale est de coupler la RFID passive avec les dispositifs de transferts de puissance et de récupération d'énergie avec pour objectifs 1) de maximiser l'efficacité de conversion RF – continu 2) et d'augmenter la distance de lecture des tags passifs. Plusieurs prototypes ont été réalisés et leurs performances ont été démontrées.L'ensemble de ces travaux a mis en évidence un nouveau concept de communication RFID exploitant les non-linéarités générées par les puces RFID. Ce concept ouvre la voie à de nouvelles applications. et a fait l'objet d'une demande de brevet international Powered by the exploding popularity of the Internet-of-Things (IoT), the demand for tagged devices with labels capable to ensure a reliable communication with added functions beyond the identification, such as sensing, location, health-care, among others, is growing rapidly. Certainly this growing is headed by the well-established Radio Frequency Identification (RFID) technology, and the use of wireless low-cost self-powered tags, in other words passive RFID tags, is the most widespread used alternative. In the constant evolution on this field, usually new software treatments are offered at the application layer with the objective to processing data to produce some new information. Further works aimed at improving the physical layer around the tag antenna miniaturization and matching techniques. So far, little or no work had been done on the exploitation of the communication channel, and certainly none has been done on the exploitation of the non-linear behavior of RFID chips.After presenting the RFID technology and phenomena produced by Radio Frequency (RF) non-linear devices, and leaning in some nearby works on the field, the core of this thesis starts by exposing two characterization platforms for the evaluation of non-linear phenomena presented during the reader-tag communication. One is specialized in radiating measurements considering the whole tag (antenna and chip) under test. The other is specialized in conducted measurements directly over RFID chips, allowing performing different parametric studies (power dependency, impedance, harmonic production, sensitivity). The characterization results show that harmonic signals generated from the passive RFID chip carry information.By exploiting the characterization results and to verify the hypothesis of exploitation of non-linearities in RFID, i.e. the use of harmonic signals, the research is pursued by designing, fabricating, and measuring four different configurations of RFID tags. The new RFID tags operate at the fundamental frequency in the UHF band and at its $3^{rd}$ harmonic in the microwave band. Antenna design policies, fabrication details, and parametric studies on the performance of the new prototypes are presented. The parametric study takes special care in the antenna structure, kind of chip used, received power, and read range.Finally, some alternatives approaches for the exploitation of non-linear effects generated by rectifying devices are presented. Some theoretical aspects and experimental results are discussed linking the passive RFID technology to the theories of Wireless Power Transfer (WPT) and Electromagnetic Energy Harvesting (EEH). The solution takes advantage of the non-linear nature of rectifying elements in order to maximize the RF-to-DC conversion efficiency of EEH devices and increase the read range of passive RFID tags. The solution triggers on the design of a RF multi-device system. The design procedure and tests consider three non-linear phenomena: (1) the impedance power dependency, (2) the harmonic production, and (3) the rectifying dependence on the RF waveform

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Taoufik, Sanae. "Fiabilité et analyse de défaillance des tags RFID UHF passifs sous contraintes environnementales sévères." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMR009/document.

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Ces dernières années, la technologie RFID (identification par radiofréquence) s’est fortement développée dans de nombreuses applications industrielles parmi lesquelles les secteurs de l’aéronautique et l’automobile où il y a une forte demande en systèmes d’auto-identification fonctionnant dans des environnements difficiles. Dans ce contexte, l'objectif de ces travaux de thèse est d'étudier les effets du stockage thermique sur la fiabilité des tags RFID UHF passifs. Pour ce faire nous avons adopté une méthodologie homogène contribuant de façon significative à atteindre nos objectifs. La première étape de cette méthodologie consistait à choisir le tag à tester, deux types de tags Web et Tageos provenant de deux fabricants différents ont été soumis à des tests de vieillissement accélérés sous différentes températures. La deuxième étape était de définir les paramètres des tests de vieillissement et de caractériser les tags vieillis. À l'aide d'un banc de mesure dédié, la puissance réfléchie par l’ensemble des tags vieillis est mesurée après chaque phase de vieillissement en fonction de la distance entre l’antenne du tag et celle du lecteur RFID. La puissance réfléchie diminue considérablement après chaque phase de vieillissement avec différentes dynamiques de dégradation pour tous les tags vieillis. Cette dynamique de dégradation dépend du type de tag testé et de la température de test. La dernière étape de la méthodologie comportait l’analyse statistique et physique de défaillance, des différences claires dans les modes, les mécanismes et les temps de défaillance entre les tags Web et Tageos ont été observées. L’analyse physique de défaillance par microscopie optique et MEB a révélé des fissures dans les conducteurs métalliques de l'antenne pour une partie des tags vieillis, cependant pour l’autre partie des tags, aucune défaillance de l'antenne n'a été observée. Des déformations au niveau de la matrice polymère de l'ACP ont été révélées, ce qui a modifié l'adaptation d'impédance entre le RFIC et l'antenne. Des simulations en utilisant le logiciel de modélisation multi-physique COMSOL a été mise en place dans le but de reproduire les mécanismes de défaillances révélés expérimentalement soit au niveau de l’antenne ou de la RFIC. Ces travaux de thèse ont démontré l'importance d'étudier les effets du stockage en haute température sur la fiabilité des tags RFID passifs. Les défaillances sont apparues plus rapidement et les tests ont coûté considérablement moins onéreux par rapport aux autres types de tests de vieillissement accélérés Nowadays, RFID has strongly developed in many industrial applications, including the aeronautics and automotive sectors, where there is a strong demand for auto-identification systems operating in severe environments. In this context, the objective of this thesis is to study the effects of thermal storage on the reliability of passive UHF RFID tags. To achieve this, we adopted a consistent methodology. The first step of this methodology was to choose the tag under test. Two types of tags Web and Tageos from two different manufacturers are aged under high temperatures. The second step was to define the parameters of the aging tests and to characterize the aged tags. Using a dedicated measurement bench, the reflected power is measured after each aging phase for all tested tags to determine the power loss caused by the high temperature storage. Reflected power decrease significantly after each aging phase with different dynamics of degradation for all aged tags. This dynamics of degradation depends on the temperature test and the type of tag. The final step involved statistical and physical failure analysis. Clear differences about modes, mechanisms and failure times between Web and Tageos tags have been observed, it seems that Tageos tags are more reliable than Web tags. Failure analysis of the samples, using an optical microscope and SEM, has revealed, cracks in the antenna metallic conductors on a part of the aged tags. In another part of the tags, no failures in the antenna have been seen, but clear deformations at the polymer matrix of the ACP have been observed, thus changing the impedance matching between the RFIC and the antenna. Simulations using the COMSOL multiphysics software have been implemented in order to reproduce the experimental failure mechanisms. This thesis work has demonstrated the importance of studying the effects of high temperature storage on the reliability of passive RFID tags. Failures appeared faster and tests cost considerably less than other types of accelerated aging tests

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Liu, Ran [Verfasser], and Andreas [Akademischer Betreuer] Zell. "Mapping, Path Following, and Perception with Long Range Passive UHF RFID for Mobile Robots / Ran Liu ; Betreuer: Andreas Zell." Tübingen : Universitätsbibliothek Tübingen, 2014. http://d-nb.info/1163282367/34.

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Modaresi, Mahyar. "System and Method for Passive Radiative RFID Tag Positioning in Realtime for both Elevation and Azimuth Directions." Thesis, KTH, Communication Systems, CoS, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-24562.

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In this thesis, design and realization of a system which enables precise positioning of RFID tags in both azimuth and elevation angles is explained. The positioning is based on measuring the phase difference between four Yagi antennas placed in two arrays. One array is placed in the azimuth plane and the other array is perpendicular to the first array in the elevation plane. The phase difference of the signals received from the antennas in the azimuth array is used to find the position of RFID tag in the horizontal direction. For the position in the vertical direction, the phase difference of the signals received from the antennas in the elevation plane is used. After that the position of tag in horizontal and vertical directions is used to control the mouse cursor in the horizontal and vertical directions on the computer screen. In this way by attaching one RFID tag to a plastic rod, a wireless pen is implemented which enables drawing in the air by using a program like Paint in Windows. Simulated results show that the resolution of the tag positioning in the system is in the order of 3mm in a distance equal to 0.5 meter in front of the array with few number of averaging over the received phase data. Using the system in practice reveals that it is easily possible to write and draw with this RFID pen. In addition it is argued how the system is totally immune to any counterfeit attempt for faked drawings by randomly changing the transmitting antenna in the array. This will make the system a novel option for human identity verification. QC 20100920

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21

Nguyen, Dat Son. "Développement des capteurs sans fil basés sur les tags RFID uhf passifs pour la détection de la qualité des aliments." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00951402.

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Le but de cette thèse est de développer des capteurs sur la base des tags RFID, des technologies et matériaux disponibles au Vietnam afin de contribuer à résoudre la problématique du contrôle de la qualité des produits alimentaires. En effet la technologie RFID s'est affirmée en importance pour ses applications dans de nombreux domaines. Dans ce contexte, l'identification des produits alimentaires expirés, sans les endommager, est une orientation de recherche très prometteuse. Un tag RFID UHF passif peut aussi être composé de plusieurs puces et plusieurs antennes, chaque couple puce/antenne conçu pour travailler sur un intervalle déterminé de valeur de permittivité. Donc, à partir de l'ensemble des permittivités définies pour chaque couple puce/antenne et les signaux réfléchis vers le lecteur, nous pourrons "mesurer" la permittivité de l'objet tracé. Ainsi la connaissance de la permittivité des aliments et la conception spécifique de l'antenne, nous développerons un tag capteur de type "multi puce/antenne" qui sera utilisé comme un capteur sans fil pour la détection de la qualité des aliments

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22

Jebbawi, Khodor. "Etude et réalisation d'un système embarqué UHF appliqué à la récupération de statistiques chez le sportif amateur." Electronic Thesis or Diss., Aix-Marseille, 2020. http://theses.univ-amu.fr.lama.univ-amu.fr/200917_JEBBAWI_711xpp867owr742fklcav366xhj_TH.pdf.

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Cette thèse a été financée par l'ANRT, elle a pour objectif de concevoir et réaliser des antennes spécifiques pour des objets connectés. Plus précisément, l'application finale est dédiée au domaine sportif, afin de récolter les statistiques d’un footballeur amateur grâce à un ballon connecté et une chevillère connectée. Le coeur technologique de ce dispositif est basé sur la RFID. L'architecture du système comporte : une antenne lecteur placée sur le pied du joueur capable de communiquer avec des étiquettes insérées dans le ballon. A la fin du match, les statistiques récoltées par les capteurs sont envoyées par la liaison BLE pour les afficher sur un totem. Deux objectifs principaux sont visés dans ces travaux de thèse : le premier aborde la conception d'antennes large bande et multistandards pour lecteurs, capable de minimiser l'influence du corps humain sans sacrifier la portée, le second objectif est la conception d'antennes résistantes aux chocs mécaniques pour les étiquettes This thesis was funded by the ANRT. The main goal is to design a specific antennas for connected objects. The final application is dedicated for the sport, in order to collect the performance of an amateur football player by using a connected ball and a connected strap. This device is based on the passive RFID. The system is composite of: a wearable antenna placed on the ankle, able to communicate with RFID tags inserted inside the ball. At the end of the match, the statistics collected by the sensors are sent by using BLE connection to a totem in order to display them. Two main objectives are targeted in this thesis: the first one is designing a broadband and multistandard antennas for readers, able to minimize the influence of the human body without sacrificing reading distance, the second objective is designing a resistant antennas for RFID tags

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Flieger, Matthias Ludwig [Verfasser], Thomas [Akademischer Betreuer] Geßner, Thomas [Gutachter] Geßner, and Helmut [Gutachter] Seidel. "Entwicklung, Modellierung und Verifikation einer Dual-Feed-Antennenstruktur für leistungsfähige, passive UHF-RFID-Sensoren auf kritischen Oberflächen / Matthias Ludwig Flieger ; Gutachter: Thomas Geßner, Helmut Seidel ; Betreuer: Thomas Geßner." Chemnitz : Universitätsbibliothek Chemnitz, 2013. http://d-nb.info/1214245994/34.

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Miranda, Hugo Manuel Oliveira de. "Sistemas RFID UHF." Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/16273.

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Mestrado em Engenharia Eletrónica e Telecomunicações O interesse por sistemas de identificação por radiofrequência (RFID) tem aumentado de forma significativa nos últimos anos, principalmente na identificação e tracking de objectos, animais e pessoas através de um modo de comunicação sem fios. Esta comunicação é feita por ondas de rádio que são transmitidas por um leitor, através de uma antena a um identificador (etiqueta) que atribui a um objeto uma identidade única, o chamado código de identificação único. Esta tecnologia não só identifica, mas também armazena dados atribuídos a determinado objeto, animal ou pessoa. No entanto, o RFID apresenta ainda consideráveis limitações, que inviabilizam o seu uso. Duas importantes razões que tornam esta tecnologia menos interessante _e o seu excessivo custo, causado não só pelos preços dos leitores e das antenas, mas também pelo preço do processo de fabrico das etiquetas; e devido ao facto de serem usados leitores não-reconfiguráveis a novos protocolos de comunicação, novas etiquetas ou até mesmo alterações de frequências. O primeiro objetivo deste projeto foi então desenvolver um front end de radiofrequência para a construção de um leitor RFID UHF reconfigurável de baixo custo, baseado em circuitos programáveis DSP ou FPGA, com um processador embutido e software-defined radio. Com isto pretende-se que os leitores RFID não dependam de transceivers RFID comerciais. Além disso, com este estudo pretendeu-se também a desenvolver antenas e etiquetas RFID, em material orgânico flexível, com um processo de produção de etiquetas simples e de baixo custo. Na primeira parte deste projeto, foi proposto um front end para a banda RFID UHF Europeia e para a banda Americana, que poderá ser usado, no futuro, no desenvolvimento de um leitor RFID. Este front end foi desenhado para ser robusto, de baixo custo, e com o objetivo de emitir e receber sinais de rádio. Na segunda parte, foram desenvolvidas duas antenas para leitores, uma para a banda RFID UHF Americana e outra para a banda RFID UHF Europeia. Por _ultimo, foi alterada uma impressora convencional, comercialmente disponível, e foram feitas também alterações na tinta de impressão, tornando-a condutora, para impressão de antenas para etiquetas RFID em substratos _a base de papel. Todos os parâmetros fundamentais das antenas foram simulados numericamente e testados experimentalmente. As duas antenas testadas mostraram boas performances, em particular, a antena para a banda RFID UHF Europeia, cujos valores resultantes dos testes experimentais foram muitos similares aos encontrados computacionalmente, sendo mesmo melhores para alguns parâmetros. Esta antena, não só apresentou uma boa performance na banda mencionada, mas também na banda RFID UHF Americana. Foram desenvolvidas sete etiquetas RFID, ou seja, desenhadas e impressas usando a impressora jato de tinta modificada, e testadas posteriormente. Todas as etiquetas funcionaram, embora uma delas não tenha apresentado resultados tão satisfatórios. Podemos então concluir que a nossa tecnologia permitiu ter etiquetas impressas por uma impressora convencional e, desta forma, poderá oferecer uma maior independência ás empresas que as produzem, podendo mesmo ser utilizada em ambientes de I&D, em Universidades ou Escolas, de modo simples e barato. In recent years, Radio Frequency IDentification (RFID) technology has received special attention, especially for identifying and tracking objects, animals and people through a wireless communication connection. Radio waves transmitted from a reader, through an antenna to an identifier, called tag, which attributes an Unique Identification Number (UID) to a object, animal or person are used for this communication. This technology not only helps to identify, but also to collect data attributes about a certain person or object. However, RFID still has important limitations, which slows down its growth considerably. The two main reasons for that are related not only with the excessive cost of this system due to the readers and antennas, but also because it uses non-reconfigurable readers to new communication protocols, tags or even changes in frequencies. Therefore, the first purpose of this project was to develop a front-end to be included into a low-cost reconfigurable RFID UHF reader, based on FPGA or DSP, with an embedded processor and a software-defined radio. In a long-term, it is intended to have readers that does not require commercial RFID transceivers. The second purpose of this study was to develop a simple and low-cost manufacturing process of antennas and tags in exible and organic material. Firstly, a front end for RFID UHF bandwidth across the European Union and in the North America was proposed to be implemented in the future. This front end was designed to be low-cost, robust, in order to emit and receive radio signals. Secondly, two antennas, respectively, for an American and European UHF bandwidth RFID reader were developed in this project. Ultimately, an ordinary home inkjet-printer was modified to jet conductive ink, created as a part of this study, to print tag antennas in paper based substrate. All of the fundamental parameters that needed to be evaluated for antennas were experimentally simulated and tested for the two antennas. Both showed high performances, particularly, the antenna for a European UHF bandwidth RFID reader. This antenna obtained results more similar to the numerical model, and experimental findings were even better for some parameters. Its performance was found to be high even for an American UHF bandwidth RFID reader. Furthermore, seven RFID tags were developed, meaning they were designed and printed on the modified home inkjet-printer, and then its performance was tested. Although one of these tags showed not to be highly efficient, all tags worked adequately for the purpose. Therefore, we can conclude that our technology allowed to print RFID tags using a modified home inkjet-printer, indicating that this method can offer more independency to RFID tag manufacturers and, also allow an extensive use of this system in I&D environment, University or Schools, since it is simple and cheap.

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Ghiotto, Anthony. "Conception d'antennes de tags RFID UHF : application à la réalisation par jet de matière." Phd thesis, Grenoble INPG, 2008. http://www.theses.fr/2008INPG0148.

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L'identification par radiofréquence constitue une technologie émergente et très prometteuse pour l'identification des biens et des personnes : automatisation des opérations manuelles, rapidité, informations précises. . . Il existe plusieurs technologies RFID. Dans cette thèse, nous nous intéressons à la technologie UHF passive et plus particulièrement à la conception, caractérisation et fabrication des antennes de tags RFID. En 2007, il s'est vendu plus de 1,7 milliard de tags RFID. En vue de réduire le coût de ces derniers, nous abordons leur fabrication par une technique très prometteuse qui pourrait révolutionner l'électronique, le jet d'encre. Ces travaux s'appuient sur des simulations électromagnétiques et des mesures, et considèrent différents types d'antennes RFID Radiofrequency identification is an emerging and promising technology for the identification of individuals and goods: the automation of manual operation, rapidity, precise information. . . Differents RFID technologies exist. In this thesis, we are interested in the passive UHF RFID technology and especially to the design, characterization and fabrication of RFID antennas. In 2007, over 1. 7 billion of RFID tags were sold. To lower their cost, we investigate their fabrication using ink jet printing, a technique that could revolutionize electronics industry. This work is issued from electromagnetic simulations and measurement considering several kinds of RFID antennas

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26

Seemann, Kay. "Analyse und Verhaltensmodellierung des HF-Frontends von passiven CMOS-Transpondern für UHF-RFID-Anwendungen." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=984934758.

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Pires, Walter Alexandre Ribeiro. "Antenas inteligentes em têxteis." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/18709.

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Mestrado em Engenharia Eletrónica e Telecomunicações A tecnologia RFID tem vindo a ganhar popularidade no mercado global atual, dado que a capacidade de comunicação por ondas de rádio com praticamente qualquer objeto, a simplicidade, credibilidade e reduzido custo justi cam o crescente interesse e investimento nesta tecnologia. A indústria têxtil é um setor de atividade extenso e multifacetado, que desenvolve e fabrica produtos para aplicações bastante diferenciadas, onde a aplicabilidade da tecnologia RFID pode trazer inúmeras vantagens nesta indústria, uma vez que a aposta em inovação, tanto em materiais como em tecnologias, permite a diferenciação e valorização desta indústria. A presente dissertação propõe o desenvolvimento de três tags RFID: uma desenvolvida apenas em substrato FR-4, outra desenvolvida somente em substrato têxtil, e por último, uma desenvolvida conjuntamente em substrato FR-4 e têxtil. Esta última constituiu o objeto principal de estudo, onde em conjunto com as outras duas tags, serviram como meio de comparação em termos dos resultados obtidos por cada uma delas. Em suma, conseguiu-se chegar a uma solução nal viável, com o desenvolvimento de uma tag RFID capaz de ser incorporada em têxtil para ns de identi cação, de dimensões 30 30 mm e passível de ser detetada a 3:8 metros. RFID technology has been gaining popularity in the current global market because the ability that radio waves have to communicate with nearly any object, its simplicity, credibility and low cost justi es the increasing interest and investment in this technology. The textile industry is an extensive and multifaceted activity sector that develops and manufactures products to a wild range of applications, where the applicability of RFID technology can bring numerous advantages to it, since innovation in both materials and technologies allows di erentiation and appreciation to this industry. The present dissertation proposes the development of three RFID tags: one developed only on FR-4 substrate, one merely on textile substrate and nally one developed using both substrates (textile and FR-4). This last one was the main object of study, where together with the other two tags, served as means of comparison in terms of results obtained by each of them. In sum, a viable nal solution was achieved through the development of an RFID tag capable of being incorporated onto a textile substrate for identi - cation purposes, with dimensions of 30 30 mm and susceptible of being detected at 3; 8 meters.

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28

Daiki, Mossaab. "Contribution au développement d’antennes lecteurs champ proche pour les systèmes RFID UHF passifs." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENT020/document.

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La RFID est une technologie majeure qui connaît depuis plus d'une dizaine d'années un essor considérable en termes d'applications. Cependant son déploiement à grande échelle reste limité par des plusieurs verrous technique et technologique par lesquels la portée de lecture des tags et leur forte sensibilité à l'environnement de l'application. Le travail engagé dans cette thèse vise le développement des nouvelles antennes lecteurs pour systèmes RFID UHF champ proche. Ce type de système exploite la bande UHF de la RFID en zone de champ proche pour la traçabilité des cibles de taille miniature sur une zone proche du lecteur avec une portée limitée. Les tags se trouvant au delà de cette portée ne doivent pas être détectés par le lecteur. L'objectif dans ce travail est d'apporter des solutions au niveau des antennes lecteurs également celles du tag pour assurer une détection des tags sur une zone confinée de l'espace. Actuellement, moyennant l'utilisation d'un tag sous forme de boucle (1*1 cm²), il est possible de lire ce dernier en contact, c'est à dire dans la zone 0 – 10 cm. Il fallait donc pouvoir assurer une lecture fiable (de type couplage EM) pour une portée s'étendant d'une dizaine de centimètres. Les antennes lecteurs champ proche développés dans ce travail sont en mesure d'assurer une zone de lecture limitée (20 à 35 cm) qui s'étend sur une dizaine de centimètres de côté RFID is one of the most popular technologies in this decade. However, its deployment at a high scale is limited by several technical and technological limitations as the read range of tags and their sensitivity to the application's environment. In this thesis we focus on the development of new reader antennas for Near Field UHF RFID systems. This type of system uses the UHF RFID band in near field zone for the traceability of miniature size targets on an area near the reader with a limited zone. Tags being outside this zone should not be detected by the reader .One of the objective of this thesis is to provide solutions in terms of readers and tag antennas to ensure detection tags on a confined area of space. Actually, we can read loop RFID tag (1*1 cm²) in contact (read range 0-10 cm). So we have to be able to ensure a good reading of tag (EM coupling) in a range from few centimeters to meters. Near field reader antenna developed in this thesis work, has a limited range between 20 and 30 cm with a large reading zone

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29

Souza, Aline Coelho de. "Conception d’antennes et méthode de caractérisation des systèmes RFID UHF en champ proche et en champ lointain." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAT095/document.

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La technologie d'identification par radiofréquence (RFID) a eu un essor très important ces dernières années notamment grâce à sa configuration polyvalente et aux innombrables possibilités d'intégration offertes par cette technologie notamment avec l'apparition d'un nouveau contexte applicatif celui des objets connectés. Depuis quelques années, des applications de la RFID UHF en champ proche ont été notamment développées afin de surmonter les problèmes liés à la dégradation de lecture des tags lorsqu'ils sont placés dans des milieux fortement perturbateurs. Les travaux de recherche présentés dans cette thèse s'intéressent à l'étude de la technologie RFID UHF en zones de champ proche et de champ lointain. Les études portent plus particulièrement sur la conception d'antennes lecteur et d'antennes tag ainsi que sur les méthodes de caractérisation des systèmes RFID en zones de champ proche et de champ lointain. Une étude sur les caractéristiques des champs rayonnées par une antenne est réalisée afin de souligner les critères les plus pertinents en vue de concevoir des antennes pour les lecteurs RFID, performantes en zone de champ proche. A partir de l'état de l'art sur les antennes tags et les méthodologies de conception classiques, une nouvelle approche de conception est développée qui vise à améliorer la conception d'antennes tags en intégrant une vision appropriée pour tenir compte du niveau de puissance espéré dans une application donnée. Enfin avec pour objectif la caractérisation des tags RFID UHF, d'une part une approche est proposée permettant l'identification de familles de tags, et d'autre part, une procédure innovante pour la mesure de l'efficacité du transfert de puissance est proposée et validée expérimentalement The Radiofrequency Identification technology (RFID) has had a huge growth these last years, due to its versatility and the uncountable possibilities to integrate this technology in many different application (tracking and inventory of goods, access control, supply chain, etc.), and in particular the brand new context of internet of things projects. For some years, the near field UHF RFID applications has been developed in order to overcome the problems related to degradations of tag's read range when needing to use it in a perturbing environment. The research work presented in this thesis come as a study of the UHF RFID in near field and far field zones. This study focus more particularly on the design of reader and tag antennas and on the characterization method in near field and far field zones. A study on the characteristics of fields outgoing from an antenna has been made, in order to underline the important criteria for the design of performant UHF RFID reader antennas in near field zone. From the state of art about tag antennas design and classical methodologies, we propose a new approach that aims improving the design of tag antennas in a more suitable point of view that is getting the expected power level in a given application. Finally, with an objective to characterize UHF RFID tags, we first propose a new approach enabling the identification of tag families, and then propose a new innovating power transfer efficiency measurement procedure, that has been validated experimentally

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30

Ghetti, Gabriele. "Localizzazione di tag passivi non lineari." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14276/.

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In questo lavoro di tesi è stato realizzato un software di elaborazione dei segnali ricevuti da una etichetta (tag) RFID chipless con l’obiettivo di stimare la distanza del tag rispetto alla posizione dei ricevitori. Questo progetto trova importanti applicazioni legate alla localizzazione sia in ambito hi-tech che di largo consumo, come ad esempio la logistica, l’automotive e i sistemi di automazione. In questo progetto è stato curato specificamente il processo di acquisizione ed elaborazione dati, processando al calcolatore con l’ausilio del software MATLAB® i risultati provenienti da un simulatore circuitale del tag. In particolare, i dati da elaborare sono stati forniti da un progetto di ricerca correlato a questo dove è stato studiato e realizzato un tag RFID chipless passivo di tipo armonico non lineare.

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Li, Ming-hsiang, and 李明翔. "MIMO UHF Passive RFID Tag." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/04760303539379187919.

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碩士 國立臺灣科技大學 電機工程系 103 Due to the long read range, the performance of Ultra High Frequency (UHF) Identification (RFID) system can be easily affected by multi-path fading. To overcome the preceding problem, a MIMO UHF passive RFID tag, operating at 925 MHz, complied with the regulation of Taiwan, is proposed in this thesis. With different polarizations of transmitter, we measure the tag backscatter power .The experimental results verify the effects of tag against multi-path fading. The structure of the dual antenna tag is referred to the structure of analog front-end circuit of Wireless Identification and Sensing Platform (WISP) and the 　semi-passive dual antenna tag design in Lin’s thesis and optimized becoming a passive dual antenna tag. Furthermore, we add the quantization function of Received Signal Strength Indicator (RSSI) on MSP430. Thus, the quantized values can be transmitted to receiver by Space-Time Block Code, STBC. In addition, because of the difference pattern of backscatter of the improving tag, compared with tag proposed by previous literature, the reader we used before is not available to analyze the data. Therefore, the effects are verified by measuring, observing and analyzing the energy variation.

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32

Huang, Yi-Shan, and 黃譯賢. "UHF Passive Circuit Design for RFID Transponder." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/30582073392265466000.

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碩士 國立暨南國際大學 電機工程學系 100 In this thesis, an UHF 915MHz passive circuit design for RFID transponder is proposed by using TSMC 0.18μm Mixed Signal/RF 1P6M CMOS process. The passive circuit consists of a voltage multiplier, a voltage limiter, a voltage reference, a regulator, an oscillator and a digital signal control circuit. The chip area only requires 0.72 × 0.79mm^2 with I/O pads. The power for front-end circuit is harvested from the incident UHF radio waves. In order to increase output voltage and power efficiency, we used zero threshold voltage of native CMOS device to establish 12-stage voltage multiplier. The passive front-end circuit can generate DC voltage 1.3V in minimum input power is as low as 0.8V. This stable voltage can power up the other internal circuits and make them work regularly. The internal output of oscillator is 1.2MHz. Finally, output a 64-bits modulation signal by the digital signal control circuit in the digital modulator. The chip used bond-wire to printed circuit board and used matching components to measurement, the power consumption is approximately 1.7μW.

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Ko, Yi-Hsin, and 柯宜欣. "A Highly Efficient UHF Passive CMOS RFID Tag." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/9636kw.

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碩士 國立臺灣科技大學 電機工程系 99 This thesis presents an UHF passive radio-frequency-identification (RFID) tag chip. This tag is applicated in RFID indoor localization system. The system operates at dual bands: the 2.45GHz continue wave for charge the tag and backscattering the RF data to the Reader; the other band, 925MHz or 866.4MHz for receiving and decoding the modulated signal. For the indoor localization system, this thesis designs a low power consumption RFID Tag. We remove the regulator and the oscillator, which are known to consume a large amount of power. The lowest RF power that our Tag can work is -23dBm. Since the PIE symbol is self-timing, this thesis presents a new method to decode PIE symbols to binary codes. The proposed RFID tag is designd in TSMC 0.18μm 1P6M CMOS process in Full-Custom design flow.

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Lin, Ying-Te, and 林穎德. "Performance Testing Method for RFID UHF Passive Tags." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/n4f3k7.

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碩士 國立臺北科技大學 機電整合研究所 99 The general manufacturing production machine of UHF passive RFID, the technology of online inspection is used in near field to read the serial number tag successfully or not in order to measure that the electronic tag is good or bad and to determine high and low production quality, but it cannot show further tag performance. This study research provides a short distance performance testing method by using passive tag and use the EPCglobal static test method to measure the turn on power, and test received signal strength indication in this condition. By the transfer method proposed in this study can get the longest steady reading distance; this method not only can help business owners to process the real-time online quality inspection, but also can grad in product manufacturing to reduce customer complaints and enhance product applications .

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35

Peng, Jhih-Guo, and 彭智國. "A Battery-assisted Passive UHF RFID Tag Design." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/88191383975282428154.

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碩士 國立臺灣科技大學 電機工程系 96 This paper based on a multi-carrier method presents the design of an enhanced passive tag (EPT) that can extend the read range of an EPCglobal Class1 Gen2 (C1G2) tag by attaching a battery-assisted circuit (BAC) to the tag IC. The BAC generates a low power unmodulated continuous wave with frequency outside the tag operating band to supply additional power to the tag. In this work Agilent Advanced Design System software is used to simulate an EPT, which validates that the tag IC can harvest both signal powers from the reader and the BAC. With the same reader transmission power, empirical results demonstrate that a prototype EPT has much longer read range and is more resistant to multipath fading than a regular C1G2 tag. Unlike a semi-passive tag that depends on its local battery to work, a powerless EPT can function as a regular C1G2 tag. That is, an EPT with a charged battery behaves similarly to a semi-passive tag, and can keep working as a regular C1G2 tag after running out of its battery power.

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Tan, Jie-wei, and 譚介瑋. "925MHz UHF Passive RFID System with Backscatter Diversity." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/12786429913605063570.

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碩士 國立臺灣科技大學 電機工程系 100 The multi-path fading problem causes Ultra High Frequency (UHF) Radio Frequency Identification (RFID) system performance degradation. To overcome this problem, a 925MHz RFID system with backscatter diversity that complies with Taiwan regulations is proposed in this thesis. The proposed system is composed of RFID tag with backscatter diversity and its corresponding reader. In the forward (Reader to tag) link, the RFID tag uses selective combining technique to improve its performance. In the reverse (Tag to reader) link, the tag backscatters space-time block coded signals, and the reader uses maximum ratio combining technique to obtain diversity gain to mitigate the multi-path fading problem. In addition, considering the complexity limit of the software defined radio platform that used in this thesis, a reader with new design, which has higher tag read rate than its preceding design, is proposed.

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37

Chang, Yu-Hung, and 張郁宏. "Channel Measurement of MIMO UHF Passive RFID Systems." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/d7nczp.

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碩士 國立臺灣科技大學 電機工程系 106 Wireless communications have been used pervasively in various applications in recent years. In the field of wireless communication, Radio Frequency Identification (RFID) is a communication system that has developed many applications. Therefore, there have been lots of literatures discussing the related fields of radio frequency identification, including the design of readers and tags, single input single output (SISO) and multiple input multiple output (MIMO) system implementation and performance analysis, as well as for the radio frequency identification channel measurements. In this thesis, the UHF MIMO RFID system channel is measured by the spread-spectrum sliding correlator software defined radio based channel sounder with M-sequence and Kasami sequence, and the (1, 2, 1) MIMO RFID system is built by the polarization diversity of the MIMO tag-end antenna. The measurement results of 900MHz UHF band indoor propagation, and their corresponding channel characteristics including power delay profile, channel impulse response in terms of tap delay line, RMS delay spread and an indoor UHF small scale fading channel model is proposed based on the measurement results. The comparison of these results is also provided in this thesis.

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Chiang, Jia-Hua, and 羌家輝. "Design of Small UHF Passive RFID Transponder Antennas." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/27j23n.

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碩士 國立臺北科技大學 電腦與通訊研究所 95 The characteristics of the transponder antennas for radio frequency identification system (RFID) have been investigated in this discussion. The electro-magnetic numerical software HFSS have been applied to analyze and design the antennas. Our work discuss the relation between the changes of the antenna structure and its equivalent impedance. We have adapted folded dipole antenna as the prototype. The content of the design is as follow: The fractal-like loaded geometry can be utilized to miniaturize antennas. In addition, the properties of fractals make them especially suitable to design high gain and wideband antennas. The spirally loaded geometry which increases convoluted arms makes the current path unidirectional, result in have high gain and high efficiency antenna. The meander loaded geometry also reduces antenna size to a great extent. In this work, we also deal with the problem of degrading radiation characteristic of the antenna in a result of size reduction by designing a miniature transponder antenna to meet the requirement of the commercial RFID application.

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Li, Ming-Cheng, and 李明橙. "Performance Analysis for MIMO UHF Passive RFID Systems." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/k4752m.

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碩士 國立臺灣科技大學 電機工程系 104 The multi-path fading causes signal interference and unstable link quality easily for Ultra High Frequency (UHF) Radio Frequency Identification (RFID) systems. To overcome this problem, a 925MHz Multi-input Multi-output (MIMO) UHF passive RFID tag and its corresponding reader are realized in this thesis. In this work, we use the Ettus Research's Universal Software Radio Peripheral (USRP), which is a software defined radio (SDR) platform, to implement a reader for MIMO UHF passive RFID tag. In the forward (Reader to Tag) link, the RFID tag with antenna orthogonal polarization diversity uses selective combining technique to improve its received power. In the reverse (Tag to Reader) link, the tag backscatters space-time block coded signals, and the reader uses maximum ratio combining technique to obtain diversity gain to alleviate the multi-path fading problem. In this work, we also compare the performance of Wireless Identification and Sensing Platform (WISP) developed by the University of Washington with MIMO tag using the same USRP, and we present and discuss the experimental results.

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40

Tsai, Yu-Sheng, and 蔡友盛. "UHF Passive RFID Transponder with the AES Security Mechanism." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/70819628549551916322.

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41

Wu, Hsin-Hung, and 吳信宏. "A Novel Reader Design for UHF Passive RFID System." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/91559671674549919225.

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碩士 國立臺灣大學 電信工程學研究所 95 In this thesis, we discuss the “fading effect” in the multipath environment and explain how it influences the RFID system. Then, we propose a novel reader architecture to solve this problem. We construct a measurement system and use two separate antennas to receive the backscattered field from the tag. After some signal processes, the combining method is used to combine these two branches. Finally, we use the coherent detection method to detect the resultant signals. Through this procedure, the readability will be increased and fading effect will be combated. In addition, when there are many tags set closely, the mutual coupling effect will make the middle tag hard to be read. Consequently, we use four different arrangements: side-by-side, cross, stagger, and corner. The spacing is 3 cm. By this method, the mutual coupling effect can be reduced, and the readability of the middle tag can be increased. Then, in order to analyze the actual waveform received by the reader, we set three tags parallel and use vector signal analyzer (VSA) to capture the communication signals between the reader and the tag. We use the coherent detection method to detect these signals, and it can get better performance than the incoherent detection method.

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42

Cheng, Kung Wei, and 鄭功蔚. "The Application of Passive UHF RFID on Indoor Positioning." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/88475093461553995113.

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碩士 國立宜蘭大學 資訊工程學系碩士班 103 Nowadays technology and smart mobile devices are getting more and more popular. The growing speed of technologies is rapid. People now will not only have one smart mobile device with them but instead perhaps two or three are carried along. With the full function of smart mobile devices almost all are coming with Global Position System-enabled (GPS-enabled). The GPS has become a must accessory in a smart mobile device. GPS was made for outdoor positioning so it works perfectly at outdoors. However, the limitation of GPS is it cannot provide the same service at indoors. Although with the help of AGPS(Assist GPS) indoor positioning is a little more accurate but the rate of error is still large. Therefore, to solve the problems of indoor positioning the research of this issue is necessary. In recent years, more and more applications of RFID have been presented. The usage of RFID can be seen almost everywhere. From transportations to purchase payment even at home we can use RFID as an identifier and trigger for door and lights. As for indoor positioning, RFID also has its important role and differences with other technologies. In this thesis, a computer program has been written with referencing of other documents. The program is use for indoor positioning with built-in UHF RFID smart mobile device as instrument. The way of this solution is to put RFID Tags on to the wall and use the UHF RFID Reader to read. By using the “Decreased Transition Signal Strength and Distance” chart which is also proposed in this paper we will know the distance between Reader and Tags. Once the distances and other data are collected we can calculate the position of UHF Reader/ built-in UHF RFID smart mobile device.

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43

ZongYing, Kuo, and 郭宗穎. "UHF Passive Front-End Circuit Design for RFID Transponder." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/60954636220414916133.

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碩士 國立暨南國際大學 通訊工程研究所 99 In this thesis, an UHF 915MHz passive front-end circuit design for RFID transponder is proposed by using TSMC 0.18μm Mixed Signal/RF 1P6M CMOS process. The passive front-end circuit consists of a voltage multiplier, a voltage limiter, a voltage reference, a regulator, a demodulator, an oscillator, a divider and a power-on-reset circuit. The chip area only requires 0.78 × 0.64mm^2 with I/O pads. The power for front-end circuit is harvested from the incident UHF radio waves. In order to increase output voltage and power efficiency, we used zero threshold voltage of native CMOS device to establish ten-stage voltage multiplier. The passive front-end circuit can generate DC voltage 1.5V in minimum input power is as low as -6dBm. This stable voltage can power up the other internal circuits and make them work regularly. The data rate is 125Kbps and internal output of oscillator is 1.7MHz。The chip used bond- wire to printed circuit board and used matching components to measurement, the power consumption is approximately 32μW.

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Chen, Jiun-Fan, and 陳俊帆. "A UHF Passive RFID Transponder for Sensing Environmental Parameters." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/20100808739814639982.

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碩士 元智大學 電機工程學系 97 In this thesis, we implement a front-end circuit of Ultra High Frequency (UHF) passive Radio-Frequency Identification (RFID) tag, including RF-DC converter and regulator. Thorough analysis of the RF to DC circuit are presented analytically, focusing on the loss of the parasitic capacitor and resistance, the relationship between the input voltage and the n-th stage of the rectifier circuit and the number of stages versus the output voltage. The chip is fabricated in standard TSMC 0.35um CMOS 2P4M process and the function of each block in the chip is measured respectively. The chip area is 0.576 x 0.47 mm2, and the total power consumption is 805uW. The LDO regulator circuit consumes most of the power.

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Kuo, Che-Jung, and 郭哲榮. "The Analysis of Multi-Carrier UHF Passive RFID Systems." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/78695012310534459598.

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碩士 國立臺灣科技大學 電機工程系 96 In recent years, the applications of passive RFID systems have gained more attentions. Because a tag must obtain its operating power from a continuous wave transmitted from a reader In a passive RFID system, the readable range is hence limited. Consequently many researches on readable range extension have been proposed. In this thesis, we use a multi-carrier method to supply the operating power of a passive tag. In an interrogation region, continuous wave emitters, which provide additional operating power to passive tags, are deployed following the similar manner of base station deployment in a cellular phone system. Because the transmission powers of continuous wave emitters must jointly consider the tag minimum modulation depth constraint and the tag minimum operating power requirement, the transmission powers of continuous wave emitters must be carefully chosen. In this thesis, an analytical analysis of continuous wave emitter transmission powers is derived. Assuming all tags are uniformly distributed in an interrogation region, the optimum continuous wave emitter transmission power that leads to the largest reader readable range can be obtained according to the analysis. Simulation results show that the optimization of continuous wave emitter transmission powers can achieve better read range extension. In addition, using modified waveform command can loosen the tag modulation depth constraint and hence further extend the reader coverage.

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Wu, Hsin-Hung. "A Novel Reader Design for UHF Passive RFID System." 2007. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-1907200711331600.

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Gautham, Ananyaa. "Practical evaluation and analysis of passive UHF RFID tags." 2008. http://hdl.handle.net/10106/1002.

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Chang, Cheng-Hung, and 張正弘. "Tags design and RCS analysis for passive UHF RFID." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/39259164184862478873.

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碩士 元智大學 通訊工程學系 96 This thesis is devoted to the design, fabrication and testing of tags for passive UHF radio-frequency identification (RFID) system. RI-UHF-STRAP-08 form TI is identified at the chip IC strap for the tag due to its relative low DC power consumption. While the chip impedance of the tag IC was characterized through TRL calibrated measurement system, complex conjugate matching technique at desired frequency was adopted. In order to achieve good power match, across the entire frequency band of operation, quasi log-periodic antenna scheme was implemented . The tested maximum readable was measured to be 4.5m at EIRP=4W output level.

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Hong, Ya-Chi, and 洪雅琦. "A Passive UHF RFID Tag for RF-sensor Application." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/34959334702183730051.

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碩士 元智大學 電機工程學系 96 In this thesis, a passive UHF 925MHz RFID tag for RF-sensor is presented. The proposed RFID tag circuit includes the CMOS RF to DC rectifier, ASK demodulator, ASK modulator, logic and control circuit, and power on reset. The 925MHz RFID tag matches the EPC Gen-2 specifications, where the data rate is 640K/s. The maximum power that the tag received is 180uW. The totally power consumption of the tag in this work is 57uW, and it is totally supplied from the antenna received. This whole circuit is implemented in the TSMC 0.35um CMOS 2P4M standard process, and its size is 0.7*0.57um2.

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Lin, Pei-Ju, and 林倍如. "Implementation of Passive UHF-RFID Location Aware Prototype System." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/71674732546924121240.

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碩士 義守大學 電子工程學系碩士班 98 Radio Frequency Identification (RFID) has been considered as an attractive method for the ubiquitous computing. One area of ubiquitous computing is composed by the location-aware systems, systems where applications are designed to estimate the coordinates of tracking objects in qualified vicinity or in correlation to reference locations. The passive UHF RFID system is an attractive solution for location awareness applications. Passive UHF RFID tags have gained significant popularity due to their low cost, small footprint, ability to function without batteries, faster response rates and longer read ranges as compared to common HF RFID tags. In this thesis, a location-aware systems based on passive UHF RFID technology is proposed. In UHF RFID system, the role of antennas is very important for transfer power and signal. Therefore, reader antenna is a key important component of RFID system. The design and simulation of a patch antenna with circular polarization is presented. A circularly-polarized antenna can help maximize performance of the location awareness system. In contrast to compute the position of the tracking tag based on each individual reference tag, a cluster localization algorithm is introduced to improve the tracking accuracy. Based on the proposed cluster localization algorithm, the performance of the system was within the reasonable accuracy for 3D location estimation. In addition, the FPGA implementation of law of cosines based on CORDIC algorithm is proposed in order to study the feasibility of enhancing the performance of a location awareness system.

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