1,721,072 research outputs found
Current and Future Trends of RFID Systems: Guest Editorial of the Special Issue on SpliTech 2021 and IEEE RFID-TA 2021 Conferences
Full text linkThis year, the IEEE Journal of Radio Frequency Identification (JRFID), decided to host a joint Special Issue collecting extended versions of papers coming from two international events. The former is the IEEE International Conference on RFID Technology and Applications (RFID-TA) 2021, virtually held in Delhi, India, on October 6-8, 2021. The latter is the International Symposium on Advances in RFID Technology organized within the International Conference on Smart and Sustainable Technologies (SpliTech), hosted in Split and Bol, Croatia, on September 8-11, 2021. SpliTech was technically co-sponsored by the IEEE and technically media sponsored by the IEEE Council on RFID (CRFID)
Reduction of Power-Discretization Effects in UHF RFID Tag Performance Estimation Systems based on Off-The-Shelf Programmable Readers
No full textThe rigorous electromagnetic characterization of passive UHF radio-frequency identification (RFID) tags is a challenging task. Among various solutions, in a previous work an automatic tool for the over-The-Air evaluation of significant RFID tag metrics has been presented. Once fixed the distance, the system, based on the estimation of the minimum power emitted by the interrogating reader capable to energize the tag under test, has an accuracy that, although adequate, is limited by the minimum power step at the reader side. In this work, a new platform implementing a smart method to overcome this limit while preserving flexibility and cost-effectiveness, is presented, implemented and tested. The platform can automatically vary with continuity the interrogating distance-which becomes hence a new degree of freedom-and it is able to estimate for each frequency the couple power-distance which annuls the estimation error due to the power-discretization
Design of UHF RFID devices based on 3D-printing technology
No full text3D-printing technology promises high added value in many scientific contexts, including that of new materials for electromagnetics. The joint use with Radio Frequency Identification (RFID) technology is very appealing for designing new RFID-based smart devices while maintaining cost-effectiveness. In this work a T-Resonator structure for the dielectric characterization of substrates, including 3D-printed ones, is firstly presented. Both permittivity and loss tangent of PLA substrates have been measured in the UHF RFID band when varying the air percentage in the printed material. On the basis on the characterized substrates, a wearable bracelet tag and a Yagi-Uda-inspired long-range tag, which exploit the peculiarities of 3D-printing, have been designed, realized, and validated. © 2017 Univeristy of Split, FESB
Single-Chip Gen2-Compliant UHF RFID Sensor Tags Based on Novel Pseudo-BAP Mode
No full textIn this work a new design strategy for UHF RFID tags mounting RFID chips with embedded sensor is proposed. In particular, a novel functioning mode named 'Pseudo-BAP' is introduced to solve the electromagnetic 'filed-off' problem and to allow for a fully Gen2-compliant tag interrogating sequence to retrieve sensor data. In particular, a prototype of Pseudo-BAP-empowered Tag testing board has been designed, fabricated in FR4 and fully tested from the electromagnetic point of view. At the end, the proposed approach allows for the passive RFID-based temperature data collection from sensor-provided RFID chips by using standard RFID readers, and appreciable working distances as large as 1.75 m have been obtained with the considered low-sensitivity chip
Parallel simulation of radio-base antennas on massively parallel systems
No full textThe rigorous characterization of the behaviour of a radiobase antenna for wireless communication systems is a hot topic both for antenna or communication system design and for radioprotection-hazard reasons. Such a characterization deserves a numerical solution, and the use of a Finite-Difference Time-Domain (FD-TD) approach is one of the most attractive candidates. Unfortunately it has strong memory and CPU-time requirements. Numerical complexity can be successfully afforded by using parallel computing. In this work we discuss the parallel implementation of the FD-TD code, individuating the theoretical lower bound for its parallel execution time, and we present the findings achieved on the APE/Quadrics SIMD massively parallel systems. Results, obtained from the simulation of actual radiobase antennas, clearly demonstrate that massively parallel processing is a viable approach to solve EM problems, allowing the simulation of radiating devices, which could not be modeled through conventional computing systems. The tests on actual systems evidenced sustained computational speed equal to 17% of the theoretical maximum. © 2001 IEEE
Battery-less RF-powered circuits for non-contact voltage monitoring of electric systems: Circuit modeling and SPICE analysis
No full textMonitoring electric power systems is essential for avoiding disruptions, improving efficiency, and detecting faults. Traditional methods involve interrupting the power lines and pose safety risks. On the contrary, non-contact power meters allow for safe power measurement without touching the wires but designing them presents challenges related to battery life and sustainability. This paper introduces a novel battery-less RF-powered wireless circuit that overcomes these limitations and optimizes the performance of the sensing of the voltage. This circuit includes an efficient RF-DC converter, a designed non-contact flexible and curved AC voltage sensor, a signal conditioning circuit, a digital processing unit, and a passive UHF Radio-Frequency Identification interface for wireless communication. It harnesses electromagnetic energy from the radio front end to power the entire system. The circuit has been properly conceptualized, developed, and analyzed through electrical modeling and SPICE simulations. Transient and steady-state analyses have been carefully conducted on individual circuit blocks to analyze their electric characteristics. Finally, a proof-of-concept circuit has been realized and experimentally verified to validate the simulation outcomes. With a bandwidth of 3 kHz, an RF-DC conversion sensitivity of -16 dBm, a current consumption of only 2.2 mA, and an efficient power management procedure, this energy-autonomous, non-contact metering circuit offers very high RF and sensing sensitivities and ultra-low power consumption, making it ideal for monitoring AC electric systems, particularly in inaccessible environments where battery-based solutions are impractical.Architecture of the novel battery-less RF-powered wireless voltage meter optimized to perform accurate voltage sensing from AC insulated wires of electric power lines and electric distribution systems. imag
Permittivity-Customizable Ceramic-Doped Silicone Substrates Shaped with 3-D-Printed Molds to Design Flexible and Conformal Antennas
No full text3-D-Printing in antenna design is a recent research branch which is attracting academic and industrial interest. Nevertheless, despite the advantages in terms of antenna customizability, common filaments exhibit limitations in some contexts where platform tolerability, flexibility, and compactness are simultaneously required. Indeed, other than a rather low permittivity of commercial 3-D-printable materials, when flexibility is required, also significant loss tangent values must be accounted. To address this problem, a method to realize conformable flexible low-loss substrates with increased and customizable permittivity is proposed in this communication. It is based on the synthesis of ceramic-doped silicone structures shaped through 3-D-printed molds by using alumina and barium titanate as ceramic filler. Different substrates were firstly realized and characterized in terms of permittivity and loss tangent at different doping percentages. Then, a first validation on 2.4 GHz conformal patch antennas exploiting both third dimension and increased permittivity is presented. Finally, a wearable and compact bracelet-shaped UHF RFID planar inverted-F antenna (PIFA)-inspired flexible antenna is designed, tested when applied on the human body, and compared with a previously realized version 3-D-printed in polylactic acid. In spite of comparable performance, the novel device exhibits considerable size reduction and improved wearability, thus confirming the effectiveness of the proposed approach
Yagi-Uda Antenna with Fully 3D-Printed Bow-Tie Elements
No full textIn this work, additive manufacturing technology by fused deposition modelling 3D-printing has been exploited in order to design and realize a first example of fully 3D-printed broadband Yagi-Uda antenna operating at 2.45 GHz characterized by 3D-printed bow-tie dipoles and reflection plane. Novel dielectric and conductive 3D-printable filaments, properly modeled in the UHF band, have been used. The structure has been firstly simulated with the full-wave simulation software CST Microwave Studio and then realized by 3D-printing the different elements, which have been subsequently assembled. The measurements on the prototype are in good agreement with the simulations, thus proving the feasibility of the manufacturing procedure and the effectiveness of the 3D-printing technology as a new alternative for fast prototyping efficient UHF antennas and RF devices
Analysis of FDM and DLP 3D-Printing Technologies to Prototype Electromagnetic Devices for RFID Applications
Full text linkIn this work, the application in Radiofrequency Identification (RFID) of different additive manufacturing (AM) 3D-printing technologies is discussed. In particular, the well-known Fused Deposition Modeling (FDM) technology is compared with the promising Digital Light Processing (DLP), which is based on the photopolymerization of liquid resins. Based on the research activity of the authors on this topic, a brief introduction to the fundamentals of 3D-printing in electromagnetics as well as to the different applications of both FDM and DLP in realizing Radio Frequency (RF) devices, is firstly given. Then, a comparison of the two technologies is deeply faced. Finally, after evaluated the rugosity of substrates produced with both techniques to verify the potential impact on the design of electromagnetic structures, the two techniques are both exploited for the realization of the dielectric parts of a tunable RFID tag with unconventional shape. It consists of two elements interlinked one each other. The movement between them enables tuning of the resonance frequency as well as the impedance of the antenna. Despite the differences in terms of losses, rugosity, resolution, and dielectric constant, both techniques guaranteed satisfactory values of tag sensitivity, maximum reading range, and tunability. Nevertheless, the careful analysis of the results proposed at the end of the paper suggests how the selection of one technique over the other must be taken considering the specific application constraints
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