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The following topics are dealt with: antennas and propagation; localization; sensors; circuits, devices & interrogators; security and privacy; and software.
A method to identify, thanks to RF signals, the letters of the alphabet is presented in this paper. Every letter, when integrated, or realized with metallic strips, on dielectric substrate and excited with an electromagnetic wave exhibits an electromagnetic signature. This signature is unique and characterizes the RCS of the radiating letter. Consequently, it could be used for identification/recognition...
With amplitude shift keying (ASK) modulation and signal envelope rising falling edge slope requirements, the efficiency of UHF RFID system can be improved by using polar transmitter architecture than using linear power amplifiers. In this work, to ensure maximum integration and meet EPC Class-1 Generation-2 specification, an all digital polar transmitter is proposed and verified by transient signal...
Paper-based, inkjet-printed antennas are proposed in this paper as replacement for the typical antennas used on the WISP RFID tag. These antennas are designed to be as concealable as possible. The designs presented exploit meandered techniques in order to achieve significantly reduced dimensions. In particularly, text-based meandered line techniques are applied to obtain both decreased size and concealment...
While RFID tags near metal have been extensively evaluated in the literature, tags on and in dielectric media have received less scrutiny and rigorous evaluation. In this paper, we develop a rigorous theoretical model for the behavior of UHF RFID tags immersed in a dielectric medium using the Uda model and embedded T-match antenna. From this, we are able to investigate a number of criteria for optimality...
In this paper the impact of the signal bandwidth on the performance of frequency modulated continuous wave (FMCW) radar based ranging to ultra high frequency (UHF) radio frequency identification (RFID) tags is investigated. The analyses are based on ultra-wideband (UWB) channel measurements performed in a warehouse portal, which is a severe multipath environment. It is illustrated that the available...
The extended reader ranges in the UHF band enable many new applications of RFID systems in the logistic sector. However, this also introduces false positive reads which can cause severe performance issues in the backend system. The performance of RFID gates as basic building blocks of RFID systems directly determines the overall behavior of the RFID application. Approaches to improve the robustness...
In this paper a method for holographic localization of passive UHF-RFID transponders is presented. It is shown how persons or devices that are equipped with a RFID reader and that are moving along a trajectory can be enabled to locate tagged objects reliably. The localization method is based on phase values sampled from a synthetic aperture by a RFID reader. The calculated holographic image is a spatial...
Printed RFID antenna is a promising solution for item-level tagging applications. In order to integrate the antenna printing with the package printing process, it is highly preferred that antenna geometries are printed on paper substrates. However, the electromagnetic property and thickness of paper substrates are subject to change. Thus wideband and material-insensitive printed RFID antennas are...
The development of RFID technology are requiring high performance and low cost tag antennas than ever before. To meet these demands, linear tapering technique is firstly proposed in the design of planar tag antennas. With this strategy, the current distribution along antenna arms is effectively assigned by varying the antenna line width. Compared with conventional ones, the tapered antennas can reduce...
Wireless embedded sensors are ideally suitable for monitoring concrete structures because of their small size and ability to measure various quantities inside concrete. Wireless power transmission for such sensors embedded in plain/reinforced concrete slab is studied here. The return loss and transmission loss of dipole and patch antennas are studied at typical RFID frequencies. Also, the antennas'...
In this contribution we analyse the read probability enhancement using two simple dual-antenna techniques for passive RFID tags for Tyre Pressure Monitoring applications. Our analysis is based on real-world channel measurements carried out with a full vehicle body for different antenna and steering angle configurations. Two frequency ranges were analysed: European UHF band at about 866 MHz and 2.45...
In this paper, we evaluate realizations for implementing an RFID reflected electro-material signature (REMS) sensor. REMS sensors allow passive measurement, recording, and reading of environmental data such as temperature in a small, low cost device. This paper presents results from two configurations: a three-section lossless microstrip transmission line and a monopole probe inserted into a lossy...
The efficiency of cold supply chain operations can be improved with pervasive temperature sensing. In this paper, we investigate the design of a low-cost, single-use RFID based temperature threshold sensor that is capable of relating the violation of a temperature threshold to a shift in the optimal operating frequency at which the tag antenna is well matched to the tag IC. This shift is detectable...
Single-use biopharmaceutical manufacturing requires monitoring of critical manufacturing parameters. However, the lack of reliable single-use sensors prevents the biopharmaceutical industry from fully embracing single-use biomanufacturing processes. We report an approach for temperature-independent pressure sensing in single-use bioprocess components using passive radio-frequency identification (RFID)...
In many safety-critical applications, battery performance is a significant limiting factor that affects the feasibility of electronic safety devices intended to alert workers to hazardous situations. In particular, battery capacity and lifetime are difficult to predict when safety devices are exposed to extremes of temperature, humidity, shock, and vibration that are common in construction, excavation,...
In this paper we present new measurement results for an Angle of Arrival (AoA) approach to localize RFID tags at 868 MHz. Self-designed three element antenna arrays, off-the-shelf IDS R901G RFID reader ICs, and UPM Raflatec DogBone RFID tags are used to generate and detect ISO 18000-6C compliant signals. The experimental setup comprises three antenna arrays and a test environment of size 3 times 3...
RFID localization is a promising new field of work that is eagerly awaited for many different types of applications. For use in a medical context, special requirements and limitations must be taken into account, especially regarding accuracy, reliability and operating range. In this paper we present an experimental setup for a medical navigation system based on RFID. For this we applied a machine...
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