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The paper describes a novel passive tag design for RFID applications. The passive tag antenna has two separable parts, which are the feeding loop and the radiating element implemented at two different layers. Energy is efficiently coupled between these two parts when they overlap within designated positions. For demonstration purpose, the overall tag design is realized on a card (credit card size),...
These notes detail the background, theory, and methodology of designing and building a CDMA-based RFID inventory system for use in applications where interrogator power, size, and/or weight is limited or where increased security or speed may be desired. Software and hardware simulations/implementations are described and a preliminary performance assessment is given. The notes conclude with a discussion...
Context-aware scenarios require sensing technologies to obtain information about the environment. The RFID EPC Gen2 technology is the de facto standard in such scenarios like retail. However, covering a large surface with RFID antennas to implement a full context-aware system requires a huge investment. We present the design, implementation and evaluation of a helical antenna based on a low-cost standard...
The internet of things has enabled the communication of "smart" physical objects and improved the quality of machine service to humans. These achievements are based on the synergy of processing information collected by different sources. This trend will continue with the next class of computing platforms enabled by millimeter-scale sensors, diversifying the signal sources including biomedical,...
Over or under consumption of fluids can lead to discomfort and diseases. Monitoring fluid intake is important to make sure people are adequately hydrated. Current approaches for automatic fluid intake monitoring are obtrusive, expensive or maintenance prone. In this research, we propose an unobtrusive, maintenance free fluid intake monitoring system based on passive (batteryless), Ultra High Frequency...
We introduce the world's first hybrid radio platform which combines the strengths of active radio (long range and robustness to interference) and Computational RFID (CRFID) (low power consumption). By a set of laboratory experiments, we show that our hybrid radio — composed of Wireless Identification and Sensing Platform (WISP) CRFID radio and Bluetooth Low Energy (BLE) — obtains higher goodput than...
We present a novel experimental setup that allows to determine the requirements of Radio Frequency IDentification (RFID) tag hardware in scenarios where multiple tags respond simultaneously. Many schemes in literature assume synchronized tag responses and impose constraints on the tag hardware — our proposed setup allows to accurately control the response delay (skew) and the link frequency deviation...
An innovative passive near-field 13.56 MHz RFID system for financial payment and national identity smartcard applications is presented. The system utilizes reactive coupling using a slit of defined width in a metal (copper) foil layer to concentrate surface eddy current density in the vicinity of a transponder having a laser-etched antenna structure.
The digital universe is growing at significant rates in recent years. One of the main responsible for this sentence is the Internet of Things (IoT), which requires middlewares capable of handling this increase of data volume in real-time. Solutions modeled at software, hardware and/or architecture level present limitations to handle such load, facing a scalability problem in the IoT scope. In this...
We present a low cost X-band microwave backscatter communication testbed incorporating integrated planar wideband bow-tie antennas. This testbed leverages low cost silicon germanium (SiGe) integrated circuits intended for the satellite television market to provide an experimental capability for backscatter experimentation in the 10.0 GHz to 11.1 GHz band. The integrated wideband bow-tie antennas have...
A magnetically coupled near-field chipless resistive sensor label, based on measuring phase at a single frequency is presented. The sensor need not determine the exact resonant frequency or quality factor, and offers high sensitivity, accuracy and dynamic range. It is also insensitive to read range variation and orientation. Being a magnetically coupled near-field system, it is fundamentally more...
This paper analyzes the achievable ranging and positioning performance for two design constraints in a radio frequency identification (RFID) system: (i) the bandwidth of the transmit signal and (ii) the use of multiple antennas at the readers. The ranging performance is developed for correlated and uncorrelated constituent channels by utilizing a geometry-based stochastic channel model for the downlink...
AC-DC rectifier and storage capacitors take up 25% or more of chip area for cost-sensitive passive RFID tags. In this work, we show that these components can be eliminated by utilizing a RF-only circuit structure. Therefore, the chip would be smaller and cheaper. RF-only logic permits digital operations to be performed from an AC, rather than DC, power supply. An UHF Gen-2 compatible RFID tag is designed...
Highly accurate and reliable indoor positioning — at accuracy levels in the 10 cm range — will enable a large a number of innovative location-based applications because such accuracy levels essentially allow for a useful real-time interaction of humans and cyber-physical systems. Activity recognition, navigation at "shelf" level, geofencing, process monitoring and process control are among...
In the new scenarios foreseen by the Internet of Things (IoT), industrial and consumer systems will be required to detect and localize tagged items with high accuracy using cheap, energy autonomous, and disposable tags. To meet these challenging requirements, the adoption of passive ultra-wideband (UWB) radio-frequency identification (RFID) appears a promising solution to overcome the limitations...
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