2003 46th Midwest Symposium on Circuits and Systems
ABSTRACT This paper proposes a physical model for poly resistors including a methodology for the ... more ABSTRACT This paper proposes a physical model for poly resistors including a methodology for the determination of the corner models based on the self heating of the device. The thermal resistance can easily be extracted from DC and temperature measurements. This model allows to get rid of the commonly used voltage coefficients.
Cette etude a pour objectif de developper un code de calcul afin d'apprehender la caracterisa... more Cette etude a pour objectif de developper un code de calcul afin d'apprehender la caracterisation de discontinuites complexes. Ce logiciel est base sur une formulation d'equations integrales resolues par une methode de moments plus connue sous le nom de galerkin. Dans le premier chapitre, nous avons rappele les principales etapes de la mise en uvre de l'approche dans le domaine spectral. Afin d'aborder l'etude de discontinuites coplanaires, nous avons introduit la notion de courant magnetique. Le deuxieme chapitre presente en detail la resolution des equations integrales du champ electrique ou magnetique, lorsqu'une discretisation rectangulaire est consideree. Dans le troisieme chapitre, l'etude de structures de formes arbitraires est apprehendee par le biais d'un maillage utilisant des fonctions de base a support triangulaire. Celles ci permettent l'etude rigoureuse de contours obliques et courbes. Un formalisme original de terminaison adaptee nu...
2020 14th European Conference on Antennas and Propagation (EuCAP), 2020
In this study, a novel resistant Radio Frequency IDentification (RFID) tag with high performances... more In this study, a novel resistant Radio Frequency IDentification (RFID) tag with high performances is presented. The proposed tag consists of two antennas. The first one is an inductive antenna used for matching the imaginary part of the chip impedance at the target frequency. The second antenna is coupled with the first one in order to increase the gain and improve the tag performances. The tag antennas are designed to operate in the EU Ultra-High Frequency (UHF) RFID band. The crossed dipole antennas technique is used to achieve the Circular Polarization (CP) in the operating band. Many prototypes have been manufactured, and good agreement between simulations and measurements has been achieved. The band covered for an Axial Ratio (AR) <3dB is from 863 to 869 MHz. The Read Range (RR) of the tag has been measured in a standard anechoic chamber. From the measured results in EU RFID band, the tag has a maximum RR of about 16.35 m at 868 MHz.
2021 6th International Conference on Smart and Sustainable Technologies (SpliTech), 2021
The NFC wireless charging technology is a new extension of the NFC technology developed and prese... more The NFC wireless charging technology is a new extension of the NFC technology developed and present on the market since the end of 2018. This technology allows devices to be charged in the same way as with Qi, another wireless charging technology widely available on the market since 2014. This article presents an overview of how this new technology operates (design, power class, efficiency) and can be complementary to Qi, by targeting the charging of small devices such as wireless headsets, smart bands or smart glasses.
2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring), 2019
This paper presents a compact triple-band antenna for active and passive Radio Frequency IDentifi... more This paper presents a compact triple-band antenna for active and passive Radio Frequency IDentification (RFID). A systematic design method is used in order to achieve triple-frequency operation. The triple-band dipole antenna is designed and etched on a single metallic layer (98 × 22.5 mm2) of semi-flex Taconic RF-35 low loss substrate with a permittivity of 3.5 and thickness of 1.52 mm. Many prototypes have been manufactured and a good agreement between simulations and measurements has been achieved. The performance of the prototypes has been measured in a standard far-field anechoic chamber. From the measured results, the resonant frequencies of this antenna are 0.868–0.915 GHz, 2.45 GHz, and 5.8 GHz. Results of the gain and reading distance in the UHF band show that the proposed antenna can be used as a portable multi-standard RFID reader antenna for long reading distance applications.
2016 IEEE International Conference on Electronics, Circuits and Systems (ICECS), 2016
The goal of this paper is to present a scenario that optimizes a passive RFID data transmission w... more The goal of this paper is to present a scenario that optimizes a passive RFID data transmission without changing its standard. This procedure is based on the inventory process defined by the EPC Gen 2 protocol. An application of this procedure will be presented through a wireless temperature sensor concept and an ASIC implementation.
2012 7th European Microwave Integrated Circuit Conference, 2012
The fabrication, characterization and modeling of fully-printed inductors on flexible plastic foi... more The fabrication, characterization and modeling of fully-printed inductors on flexible plastic foils are presented. An appropriate equivalent circuit is proposed to model the frequency behavior of a screen-printed spiral inductor on PEN (polyethylene naphthalate) substrate. A cascade open-short-thru de-embedding method for microwave on-wafer characterization is applied. The paper is focused on high-value inductors and the results are compared from 40 MHz to 10 GHz. Five turns inductors present a 90 nH and 105 nH inductances with a self-resonance frequency equal to 1.3 GHz. These inductances are sufficient to be used for electromagnetic energy harvesting in UHF (ultra-high frequency) RFID (radio-frequency identification) passive tags if their quality factors are improved.
2015 IEEE 6th International Symposium on Microwave, Antenna, Propagation, and EMC Technologies (MAPE), 2015
This paper presents a study for modelizing a Near Field Communication (NFC) technology integrated... more This paper presents a study for modelizing a Near Field Communication (NFC) technology integrated in a mobile device. It also proposes a simulation environment to perform NFC certification tests in reader-writer mode with the EMVCo (Europay Mastercard Visa Contactless) reference PICC (Proximity Integrated Circuit Card) called EMV-TEST PICC. This study is divided in 2 main parts. The first part is focused on the device under test (DUT) model. It consists of the antenna model and the ferrite inclusion followed by the chip output impedance characterization and the matching circuit model. The second part deals with the environment test and its model. This includes the coupling effect model with the reference device and a mobile phone simplified model finally followed by the power transfer test as define in EMVCo certification norm. Obviously, each study step is validated by comparing the simulated results with measurement ones.
2016 IEEE International Conference on RFID (RFID), 2016
An UHF RF energy harvester with integrated step-up converter is presented. This system is designe... more An UHF RF energy harvester with integrated step-up converter is presented. This system is designed to overcome the limits of standard RF harvesters (namely low output voltage). This objective is obtained with an extra DC/DC converter that provides an extra voltage boost, with less than 10 nW of power consumption. The accurate sub-threshold analysis of this converter allowed a start-up voltage as low as 200 mV, without compromising the overall power efficiency. The final system is intended to provide an output voltage high enough to power standard common loads (ex. microcontroller) and, more in general, any IoT wireless sensor node, with a limited amount of received power. This is confirmed by experimental results: an output voltage above 1.2 V is obtained starting from a received power of about -24 dBm. The step-up converter area is only 230 μm × 375 μm.
2014 12th IEEE International Conference on Solid-State and Integrated Circuit Technology (ICSICT), 2014
In this work, the modeling of organic thin film transistors (OTFT) is presented. The transistors ... more In this work, the modeling of organic thin film transistors (OTFT) is presented. The transistors were manufactured with a full printed technique and the modeling was done using the A-Si: H TFT model. Once the extraction procedure validated, the extraction was performed on a sample of OTFTs. This permits to obtain the scattering of each parameter. This dispersion correlated to ideal statistic function permitted to carry out some Monte-Carlo simulations and then to reach a better modeling of different circuits. The simulated results show a good matching with measurements performed on organic current mirrors.
This paper presents feasibility study of a multi-standard RFID tag antenna. The tag permits to id... more This paper presents feasibility study of a multi-standard RFID tag antenna. The tag permits to identify items with HF and UHF standard. The tag antenna is composed of two distinct antennas feed thanks to a single chip. UHF antenna is dipole like and HF antenna is a coil antenna. HF impedance leads to a quality factor close to 120. In
This paper presents the feasibility of a single chip dual band HF-UHF RFID tag antenna. Some rese... more This paper presents the feasibility of a single chip dual band HF-UHF RFID tag antenna. Some research focused on dual band HF and UHF RFID. Cost is a non negligible parameter in RFID tag antenna development. For this reason, multi-layered antennas and multi chip solutions are prohibited. The reason is that fabrication processes are too expensive to certify a low
2003 46th Midwest Symposium on Circuits and Systems
ABSTRACT This paper proposes a physical model for poly resistors including a methodology for the ... more ABSTRACT This paper proposes a physical model for poly resistors including a methodology for the determination of the corner models based on the self heating of the device. The thermal resistance can easily be extracted from DC and temperature measurements. This model allows to get rid of the commonly used voltage coefficients.
Cette etude a pour objectif de developper un code de calcul afin d'apprehender la caracterisa... more Cette etude a pour objectif de developper un code de calcul afin d'apprehender la caracterisation de discontinuites complexes. Ce logiciel est base sur une formulation d'equations integrales resolues par une methode de moments plus connue sous le nom de galerkin. Dans le premier chapitre, nous avons rappele les principales etapes de la mise en uvre de l'approche dans le domaine spectral. Afin d'aborder l'etude de discontinuites coplanaires, nous avons introduit la notion de courant magnetique. Le deuxieme chapitre presente en detail la resolution des equations integrales du champ electrique ou magnetique, lorsqu'une discretisation rectangulaire est consideree. Dans le troisieme chapitre, l'etude de structures de formes arbitraires est apprehendee par le biais d'un maillage utilisant des fonctions de base a support triangulaire. Celles ci permettent l'etude rigoureuse de contours obliques et courbes. Un formalisme original de terminaison adaptee nu...
2020 14th European Conference on Antennas and Propagation (EuCAP), 2020
In this study, a novel resistant Radio Frequency IDentification (RFID) tag with high performances... more In this study, a novel resistant Radio Frequency IDentification (RFID) tag with high performances is presented. The proposed tag consists of two antennas. The first one is an inductive antenna used for matching the imaginary part of the chip impedance at the target frequency. The second antenna is coupled with the first one in order to increase the gain and improve the tag performances. The tag antennas are designed to operate in the EU Ultra-High Frequency (UHF) RFID band. The crossed dipole antennas technique is used to achieve the Circular Polarization (CP) in the operating band. Many prototypes have been manufactured, and good agreement between simulations and measurements has been achieved. The band covered for an Axial Ratio (AR) <3dB is from 863 to 869 MHz. The Read Range (RR) of the tag has been measured in a standard anechoic chamber. From the measured results in EU RFID band, the tag has a maximum RR of about 16.35 m at 868 MHz.
2021 6th International Conference on Smart and Sustainable Technologies (SpliTech), 2021
The NFC wireless charging technology is a new extension of the NFC technology developed and prese... more The NFC wireless charging technology is a new extension of the NFC technology developed and present on the market since the end of 2018. This technology allows devices to be charged in the same way as with Qi, another wireless charging technology widely available on the market since 2014. This article presents an overview of how this new technology operates (design, power class, efficiency) and can be complementary to Qi, by targeting the charging of small devices such as wireless headsets, smart bands or smart glasses.
2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring), 2019
This paper presents a compact triple-band antenna for active and passive Radio Frequency IDentifi... more This paper presents a compact triple-band antenna for active and passive Radio Frequency IDentification (RFID). A systematic design method is used in order to achieve triple-frequency operation. The triple-band dipole antenna is designed and etched on a single metallic layer (98 × 22.5 mm2) of semi-flex Taconic RF-35 low loss substrate with a permittivity of 3.5 and thickness of 1.52 mm. Many prototypes have been manufactured and a good agreement between simulations and measurements has been achieved. The performance of the prototypes has been measured in a standard far-field anechoic chamber. From the measured results, the resonant frequencies of this antenna are 0.868–0.915 GHz, 2.45 GHz, and 5.8 GHz. Results of the gain and reading distance in the UHF band show that the proposed antenna can be used as a portable multi-standard RFID reader antenna for long reading distance applications.
2016 IEEE International Conference on Electronics, Circuits and Systems (ICECS), 2016
The goal of this paper is to present a scenario that optimizes a passive RFID data transmission w... more The goal of this paper is to present a scenario that optimizes a passive RFID data transmission without changing its standard. This procedure is based on the inventory process defined by the EPC Gen 2 protocol. An application of this procedure will be presented through a wireless temperature sensor concept and an ASIC implementation.
2012 7th European Microwave Integrated Circuit Conference, 2012
The fabrication, characterization and modeling of fully-printed inductors on flexible plastic foi... more The fabrication, characterization and modeling of fully-printed inductors on flexible plastic foils are presented. An appropriate equivalent circuit is proposed to model the frequency behavior of a screen-printed spiral inductor on PEN (polyethylene naphthalate) substrate. A cascade open-short-thru de-embedding method for microwave on-wafer characterization is applied. The paper is focused on high-value inductors and the results are compared from 40 MHz to 10 GHz. Five turns inductors present a 90 nH and 105 nH inductances with a self-resonance frequency equal to 1.3 GHz. These inductances are sufficient to be used for electromagnetic energy harvesting in UHF (ultra-high frequency) RFID (radio-frequency identification) passive tags if their quality factors are improved.
2015 IEEE 6th International Symposium on Microwave, Antenna, Propagation, and EMC Technologies (MAPE), 2015
This paper presents a study for modelizing a Near Field Communication (NFC) technology integrated... more This paper presents a study for modelizing a Near Field Communication (NFC) technology integrated in a mobile device. It also proposes a simulation environment to perform NFC certification tests in reader-writer mode with the EMVCo (Europay Mastercard Visa Contactless) reference PICC (Proximity Integrated Circuit Card) called EMV-TEST PICC. This study is divided in 2 main parts. The first part is focused on the device under test (DUT) model. It consists of the antenna model and the ferrite inclusion followed by the chip output impedance characterization and the matching circuit model. The second part deals with the environment test and its model. This includes the coupling effect model with the reference device and a mobile phone simplified model finally followed by the power transfer test as define in EMVCo certification norm. Obviously, each study step is validated by comparing the simulated results with measurement ones.
2016 IEEE International Conference on RFID (RFID), 2016
An UHF RF energy harvester with integrated step-up converter is presented. This system is designe... more An UHF RF energy harvester with integrated step-up converter is presented. This system is designed to overcome the limits of standard RF harvesters (namely low output voltage). This objective is obtained with an extra DC/DC converter that provides an extra voltage boost, with less than 10 nW of power consumption. The accurate sub-threshold analysis of this converter allowed a start-up voltage as low as 200 mV, without compromising the overall power efficiency. The final system is intended to provide an output voltage high enough to power standard common loads (ex. microcontroller) and, more in general, any IoT wireless sensor node, with a limited amount of received power. This is confirmed by experimental results: an output voltage above 1.2 V is obtained starting from a received power of about -24 dBm. The step-up converter area is only 230 μm × 375 μm.
2014 12th IEEE International Conference on Solid-State and Integrated Circuit Technology (ICSICT), 2014
In this work, the modeling of organic thin film transistors (OTFT) is presented. The transistors ... more In this work, the modeling of organic thin film transistors (OTFT) is presented. The transistors were manufactured with a full printed technique and the modeling was done using the A-Si: H TFT model. Once the extraction procedure validated, the extraction was performed on a sample of OTFTs. This permits to obtain the scattering of each parameter. This dispersion correlated to ideal statistic function permitted to carry out some Monte-Carlo simulations and then to reach a better modeling of different circuits. The simulated results show a good matching with measurements performed on organic current mirrors.
This paper presents feasibility study of a multi-standard RFID tag antenna. The tag permits to id... more This paper presents feasibility study of a multi-standard RFID tag antenna. The tag permits to identify items with HF and UHF standard. The tag antenna is composed of two distinct antennas feed thanks to a single chip. UHF antenna is dipole like and HF antenna is a coil antenna. HF impedance leads to a quality factor close to 120. In
This paper presents the feasibility of a single chip dual band HF-UHF RFID tag antenna. Some rese... more This paper presents the feasibility of a single chip dual band HF-UHF RFID tag antenna. Some research focused on dual band HF and UHF RFID. Cost is a non negligible parameter in RFID tag antenna development. For this reason, multi-layered antennas and multi chip solutions are prohibited. The reason is that fabrication processes are too expensive to certify a low
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