1,721,334 research outputs found
RFIDays 2008: Workshop on emerging technologies for radio-frequency identification: book of proceedings
No full textIdentification of things and processes by Radio Frequency (RFID) is quickly growing up as the emergent technology in logistics, security and bio-engineering. Different kinds of data may be wireless transmitted from the local query unit (reader) to the remote transponder (tag) that includes the antenna and the microchip transmitter.
The most innovative research is related to affordable interrogation within complex environment, to the identification of metal objects, to the efficient scavenging of environmental energy, to the development of miniaturized active system with high autonomy, to low cost sensorial tags and to the biomedical telemetry.
On May 12-13 2008 the University of Roma Tor Vergata, Italy, in close collaboration with CNIPA, the Italian Agency for Digital Government, organized the Workshop RFIDays-2008 on the Emerging Technologies for Radiofrequency Identification. By emphasizing the natural multi-disciplinary nature of RFId context, this two-days event offered a unique review of ideas, algorithms, technology and experimentations, coming from Electronics, Electromagnetics, Telecommunications, Computer science and Logistics and proposed an extraordinary interactions between Universities, research laboratories and companies, stimulating new interests and synergies.
This proceeding collects many of the most valuable contributes, here organized into two parts respectively concerning new technologies for reader and tag design, and the development and implementation of algorithms for system-level applications with attention to security issues
MULTIPLE-PORT RFID DEVICE, METHOD OF MANUFACTURING AND USING THEREOF
No full textAn RFID system including a reader which radiates a query signal and one or more passive multiple-port tags, each comprising multiple antenna ports; each tag includes at least two chips connected to the same antenna or each to a different antenna, so that the port impedance of each chip is different, in such a manner that the features of the reply signal of each chip allow to detect one or more physical-chemical or geometric parameters of the target on which the multiple-port tag is applied, said parameters affecting both the reception of the query signal and the emission of the reply signal
The art of UHF RFID antenna design: Impedance-matching and size-reduction techniques
No full textRadio-frequency identification technology, based on the reader/tag paradigm, is quickly permeating several aspects of everyday life. The electromagnetic research mainly concerns the design of tag antennas having high efficiency and small size, and suited to complex impedance matching to the embedded electronics. Starting from the available but fragmented open literature, this paper presents a homogeneous survey of relevant methodologies for the design of UHF passive tag antennas. Particular care is taken to illustrate, within a common framework, the basic concepts of the most-used design layouts. The design techniques are illustrated by means of many noncommercial examples
RFID-based Respiration Monitoring using Temperature Sensing
No full textAbnormal breathing can be a symptom of unhealthy status, but conventional diagnostic exams involve cumbersome and intrusive instrumentation. Wireless wearable technologies may hence provide an attractive alternative, but state-of-the-art solutions are generally bulky, include complex electronics, and require a local power source to communicate by using a BLE (Bluetooth Low Energy) interface. Epidermal battery-less devices enabled by Radio Frequency IDentification (RFID) technology are instead gaining increasing interest. Indeed, data sensing and transmission become fully wireless, and the electronic complexity can be kept small thanks to new generation RFID Integrated Circuits (ICs) that are provided with built-in sensors. In particular, this paper will focus on the latest advancements in the field of RFID breath sensor-devices that wirelessly monitor respiration by measuring the temperature gradients of the air flowing through the airways. The main innovations span from improvements in the lightweight design of the devices and materials, the enhancement of the sensing capabilities by doubling the embedded sensors on the same device, and, most importantly, the thorough experimentation performed to assess the clinical meaningfulness of temperature breathing waveforms with respect to conventional clinical-grade flow-based methods
New method for modelling and design of multiconductor airborne antennas
No full textA new approach is proposed, based on numerical (FDTD) and analytical (multi-
conductor transmission line MTL) tools, for the modelling of HF loop antennas mounted on
aircraft. This method can be used to calculate the significant mutual coupling and the interaction
with the body of the aircraft and also to perform fast optimisation of antenna size and position
Flexible and Wireless Multi-Sensor Thermometer based on Dual-Heat-Flux Model
No full textA change in body temperature can be a symptom of an unhealthy status, or can reflect physical activity and medicine intake. Temperature measurements over the skin are practical and non-invasive, but a reliable evaluation of core temperature requires invasive measurements in body cavities. Dual-heat-flux (DHF) thermometry offers an indirect method to estimate deep body temperature from the surface of the skin with four sampling points on the same device. DHF thermometers are currently wired, bulky, and rigid, but they can be made flexible and wireless by means of Ultra High Frequency (UHF) Radio Frequency IDentification (RFID) Integrated Circuits (ICs) having embedded temperature sensors. This paper presents the thermal design and preliminary temperature measurements of a multi-channel epidermal thermometer that combines RFID technology with the DHF method. The estimation of deep body temperature from wireless measurements on the surface of the skin seems feasible, with an error of about , still improvable
Design, prototyping, and characterization of laser-induced graphene antennas on flexible substrates: consolidating current knowledge
No full textLaser-induced graphene (LIG) is a widespread technology for the manufacturing of low-cost and eco-friendly sensors that can be also exploited for the fabrication of conductorless antennas and RF devices for the personal and industrial Internet of Things (IoT). In this case, additional issues must be accounted for, such as the much larger lasing area, the moderate conductivity of LIG, and the durability versus environmental and mechanical conditions in real applications, but also new opportunities to provide antennas with nonconventional features. This article provides a unitary representation of the state-of-the-art knowledge for the modeling, design, fabrication, and testing of LIG-based antennas at some frequencies of IoT systems. The reader will find information about the selection of materials, how to configure the laser parameters to minimize the sheet resistance, and how to account for the moderate conductivity in numerical solvers. The upper bound performances are identified and related to the optimal antenna size. As IoT devices include sensors, the integration with the antenna can benefit from nonuniform lasing to dump unwanted RF currents on the sensor while preserving the communication capability. Finally, the immunity of LIG antennas to external stimuli is reviewed to quantify the expected degradation of performance. This tutorial hence provides a multidisciplinary background to activate a new research line, as well as to conduct experiments with the new concept of antennas engraved on substrates
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