Design and Optimization of Passive UHF RFID Systems by Jari-Pascal Curty, Michel Declercq, Catherine Dehollain,

By Jari-Pascal Curty, Michel Declercq, Catherine Dehollain, Norbert Joehl

Radio Frequency identity (RFID) is an automated id procedure, counting on storing and remotely retrieving info utilizing units known as RFID tags or transponders. An RFID tag is an item that may be hooked up to or included right into a product, animal, or individual for the aim of identity utilizing radio waves. Chip-based RFID tags include silicon chips and antennas. lively tags require an inner strength resource, whereas passive tags don't.

Design and Optimization of UHF RFID Systems considers the research, layout and optimization of UHF passive RFID platforms for long-range purposes. there are lots of key facets completely defined within the textual content:

  • Wireless strength transmission
  • Tag-to-reader backscattering communication
  • Reader and tag architectures and IC design.

Wireless energy transmission is studied utilizing a rectifier (a primary tag building-block) for which there was a confirmed prediction version built. Proposed is a theoretical research of attainable backscattering modulations, in addition to an experimental technique to degree how the impedance modulation on the tag part, impacts the sign on the reader. ultimately, a whole tag layout reaching a learn diversity of 12 m at 2.45 GHz (4 W EIRP) is supplied. on the time of writing, the result of this layout outperform the other to be had IC tag.

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5 Real case 27 5 u m X 0 . m X 0 . 5 iixxi 30 ij,m X 0 . 3 DC voltage bias VD V Fig. 10. C-V curves for different diode-mounted transistors. 16) The found capacitor Ci,rectifier finally appears in parallel with Ri. ) constitutes an unpredictable capacitor Cadded- It can be estimated using existing CAD parasitics extraction tools. Particular care during layout is necessary to keep all added input capacitors in the RF front end circuit to a minimum. The total input capacitor is finally Q = a. i As in the ideal case, we compute the mean power that enters the circuit and we find the equivalent input resistance Ri that induces the same amount of power in identical conditions.

It required thirty years of advances in many different fields before RFID became a reality. RFID has become very popular in many areas such as purchasing and distribution logistics, automation, manufacturing companies and even the wine industry where it is used as an anti-fraud system [20]. Moreover, wireless sensing applications could 38 4 Introduction to RFID also benefit from this technology, in which an ultra low-power IC design, a wide system operating range and a small transponder size are among the most important design parameters.

It is meant for applications where only a "small" number of tags exist in a finite set. Here, "small" depends on the data-rate D at which the communication takes place. If one needs TR seconds to read one serial number among A'', the maximal duration Tn,ax of a successful communication session is equal to Tniax^TR-TV. 10) Considering the amount of information in bits / contained in a tag, TR is given by / ^^=D so that Eq. 10 becomes T™x = -^-iV. 11) From Eq. 11 it is clear that the worst-case read time decreases proportionally as the data-rate increases.

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