CNRS System Conception and Integration Laboratory

Grenoble, France

CNRS System Conception and Integration Laboratory

Grenoble, France
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Andia Vera G.,CNRS System Conception and Integration Laboratory | Duroc Y.,CNRS System Conception and Integration Laboratory | Tedjini S.,CNRS System Conception and Integration Laboratory
IEEE Transactions on Microwave Theory and Techniques | Year: 2013

In this paper, a detailed study is proposed on the properties of UHF RF identification (RFID) signals when the communication between the reader and tag is established. The main objective is to analyze the harmonics produced by the chip and radiated by the tag antenna. From experimentation, the characteristics of the nonlinearities contained in the signals are highlighted and linked to the theory of the backscattering in the RFID context. Several experiences taking into account the standards are proposed. Moreover, several commercial tags are considered in order to compare the observations. The used configuration, the experimental setup, and the protocols are described in detail. In particular, the generation of periodic and reproducible sequences of bits is introduced and its advantages are emphasized. Finally, contrarily to the classic approaches that tend to eliminate the harmonics generated by the rectifiers of tags, the great interest of the possible exploitation of backscattered harmonics is discussed in perspectives and some ideas of applications are given. © 1963-2012 IEEE.


Vena A.,CNRS System Conception and Integration Laboratory | Perret E.,CNRS System Conception and Integration Laboratory | Tedjni S.,CNRS System Conception and Integration Laboratory
IEEE Transactions on Microwave Theory and Techniques | Year: 2013

A new chipless RF identification (RFID) tag design is presented in this paper to ease the detection of items in a real environment. For this purpose, we present multiple scatterers able to depolarize the incident wave to create a response in the orthogonal polarization. Measurements in anechoic chamber and in a real environment, when the tags are positioned on dielectric and metal objects, show their higher detection capability. For the first time, a study on the technique to increase the detection area with a simplified calibration step is carried out. This makes possible the detection of the tag on objects of various sizes and compositions, which is required in the majority of RFID applications. © 1963-2012 IEEE.


Vena A.,CNRS System Conception and Integration Laboratory | Perret E.,CNRS System Conception and Integration Laboratory | Tedjini S.,CNRS System Conception and Integration Laboratory
IEEE Microwave and Wireless Components Letters | Year: 2012

This article presents a new chipless RFID tag operating in the frequency span 2 to 4 GHz. In particular the tag does not require any ground plane and it is made of 20 scatterers giving 20 b as coding capacity, for a compact size of 70×, 25 mm 2 , compatible with a credit-card format. Its fabrication process is potentially very cheap because it needs only one conductive layer, so that it can be fully printed directly on the product. To overcome the detuning effect inherent to a single layer tag and make this design robust to the environment versatility, a simple compensation technique is introduced and experimented for the first time. Measurements have been performed frequency domain, using amplitude and the group delay response. The exploitation of group delay appears to be very reliable and promising way to retrieve the coded information. © 2012 IEEE.


Vena A.,CNRS System Conception and Integration Laboratory | Perret E.,CNRS System Conception and Integration Laboratory | Tedjini S.,CNRS System Conception and Integration Laboratory
IEEE Transactions on Antennas and Propagation | Year: 2012

Designing a reader for chipless RFID is a hard task since both the polarization and operating frequency agility have to be implemented. The new tag design proposed in this paper is polarization independent, making the design of the reader easier since only linear polarization is needed to detect the tag. The proposed chipless tag is based on multiple circular ring patch resonators. The coding capacity of this tag reaches 19 bits within a compact surface of $3\times 3\ {\hbox {cm}} 2. Further, the frequency band is within 3.1 to 10.6 GHz to be compliant with FCC and ECC regulations for UWB. This new design is experimentally validated in the frequency domain using bi-static measurement set-up. Both amplitude and group delay responses of the tag are investigated and carried out. © 1963-2012 IEEE.


Vena A.,CNRS System Conception and Integration Laboratory | Perret E.,CNRS System Conception and Integration Laboratory | Tedjini S.,CNRS System Conception and Integration Laboratory
IEEE Transactions on Microwave Theory and Techniques | Year: 2012

This paper presents a new radio frequency identification (RFID) chipless tag that is highly compact and potentially low-cost. This tag has a lot of advantages, such as being fully printable on products since no ground plane is needed for fabrication. The actual issue of the chipless tag family having a single layer, that is, their detuning effect, is compensated for the first time by a correction technique based on the use of a sensing resonator. The design is based on multiple \lambda/4 coplanar strip-line resonators where resonant frequencies can be shifted by setting an additional short circuit at particular locations. An accurate model is proposed to easily link the footprint of the structure to the resonant frequency. Considering a frequency resolution of 50 MHz for the reading system and a tag dimension of 15 \times 20 mm 2, 9 b can be encoded in the frequency band 2.0-5.5 GHz. Several experimental results validate the proposed design as well as its implementation in a realistic application and environment. © 1963-2012 IEEE.


Perret E.,CNRS System Conception and Integration Laboratory | Tedjini S.,CNRS System Conception and Integration Laboratory | Nair R.S.,CNRS System Conception and Integration Laboratory
Proceedings of the IEEE | Year: 2012

This paper is mainly dedicated to the design of radio-frequency identification (RFID) tags, particularly the antennas that allow the tag to be fed, communicate, and exchange data with the reader. Good performance tags require optimized antenna that take into account numerous constraints as well as the environment of the application under consideration. Both conventional tags and robust tags are discussed. This paper also discusses how to transform a tag into an RFID sensor. © 2012 IEEE.


Siragusa R.,CNRS System Conception and Integration Laboratory | Lemaitre-Auger P.,CNRS System Conception and Integration Laboratory | Tedjini S.,CNRS System Conception and Integration Laboratory
IEEE Antennas and Wireless Propagation Letters | Year: 2011

An RFID-compatible focused circular phase-array antenna working at 5.8 GHz is proposed, which is theoretically analyzed and experimentally demonstrated. It consists of 24 half-wavelength dipole antennas placed on three circles. Using only two phase-shifters, a tunable focal spot in the range of 0.4-1 m (10λ) is obtained. The antenna system is analyzed using the HuygensFresnel theory, which is compared to the experimental results. At a focal distance of 0.9 m, the measured beamwidth and focal depth are given by 0.75λ and 5λ, respectively, which are in agreement with the calculated results. © 2006 IEEE.


Moulla R.,University Claude Bernard Lyon 1 | Lefevre L.,CNRS System Conception and Integration Laboratory | Maschke B.,University Claude Bernard Lyon 1
Journal of Computational Physics | Year: 2012

A reduction method is presented for systems of conservation laws with boundary energy flow. It is stated as a generalized pseudo-spectral method which performs exact differentiation by using simultaneously several approximation spaces generated by polynomials bases and suitable choices of port-variables. The symplecticity of this spatial reduction method is proved when used for the reduction of both closed and open systems of conservation laws, for any choice of collocation points (i.e. for any polynomial bases). The symplecticity of some more usual collocation schemes is discussed and finally their accuracy on approximation of the spectrum, on the example of the ideal transmission line, is discussed in comparison with the suggested reduction scheme. © 2011 Elsevier Inc.


Vena A.,CNRS System Conception and Integration Laboratory | Perret E.,CNRS System Conception and Integration Laboratory | Tedjni S.,CNRS System Conception and Integration Laboratory
Progress in Electromagnetics Research Symposium | Year: 2011

In this communication a new RFID chipless tag is presented. The density of coding per surface of this novel tag is important and reaches 3.3 bits/cm 2. For a surface of 1:5 × 2 cm 2, it is possible to encode 10 bits. The design presented in this paper, based on multiband coplanar strip, brings enhancement in term of miniaturization, configurability and cost of fabrication. Unlike previous solution only one layer of metal is necessary. So, such a tag could be easily printed with conductive inks. Both frequency domain measurement using a VNA and Time domain measurement based on radar approach are compared.


Vena A.,CNRS System Conception and Integration Laboratory | Perret E.,CNRS System Conception and Integration Laboratory | Tedjini S.,CNRS System Conception and Integration Laboratory
IEEE Transactions on Microwave Theory and Techniques | Year: 2011

Increasing the coding capacity of chipless RFID tags is a key factor while considering the development of miniaturized tags. A novel hybrid coding technique by combining phase deviation and frequency position encoding is proposed here. A coding capacity of 22.9 bits is obtained simply with five resonators within a reduced dimension of 2 cm × 4 cm. The proposed tag is based on 5 'C' like metallic strip resonators having resonance frequency within the band of 2.5 GHz to 7.5 GHz. The tag is potentially low-cost since only one conductive layer is needed for the fabrication. Different tag configurations are designed and validated with measurement results in bi-static configuration. A good agreement between measurement and simulation validates the theoretical predictions. © 2006 IEEE.

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