Laboratory : LCIS - ORSYS Group
50, rue Barthélémy de Laffemas,
26902 Valence cedex 9,
The research developed within the ORSYS (Optoelectronic and RF Systems) group considers signals and technologies for RF, including Wireless systems. Main projects focus on the design, optimization and characterization, as well as practical implementation. The ORSYS staff members have large expertise in applied Electromagnetism, and RF domains, as well as the integration and miniaturization of systems for communication and sensing. RFID and UWB technologies are among the most studied solutions. More recently metamaterials and nanotechnologies, due to their enabling properties, are part of our research projects.
The group has acquired many research facilities such as professional platforms for RF and Electromagnetic simulation in addition to several RF test and measurement setups including anechoic chamber.
The successful applicant will be joining the ORSYS group led by Prof. Etienne Perret, ERC grant holder, and the research aims associated to his ERC project untitled “Analysis and synthesis of wideband scattered signals from finite-size targets – aspect-independent RF analog footprint” (ScattererID - https://www.scattererid.eu/) to develop the future of the chipless RFID technology.
The need for information identification and capture is a matter of prime importance in modern societies. Every sectors of society rely on the identification of data exchanged, the updating of the data recorded on a tag and the measurement of physical parameters. The ability to make objects interact with one another or with humans is an important factor in many applications, all the more so if this interaction can occur without human presence. The way to reduce power consumption, improve the communication quality-of-service and enhance connectivity has become key issues for lots of industries. Researchers need to consider the multiple factors simultaneously to design state-of-the-art RF devices for the next generation of identification services. One important direction is to develop low-power, low cost tags for wireless identification and sensing. Lots of improvements have been done today on communication systems based on electronic devices where an integrated circuit is at the heart of the whole system. The democratisation of these chipped based systems like the RFID one will give rise to environmental issues in the future. However, these improvements pave the way for the development of new concepts based on approaches where the presence of the chip is not mandatory. These approaches are based on radar or reflectometry principles; these are non-invasive techniques but they require specific theoretical and practical developments. The difficulty is to be able to retrieve a small signal coming from a totally passive label placed in an unknown and movable environment. The objective of this project is to introduce the paradigm of RF communication system based on chipless labels, i.e. tags without any chip, bringing an ID, able to communicate with radio waves and having extremely low costs. This project aims at showing that it is possible to associate the paper based chipless label ID with other features like the ability to write and rewrite the ID, or a sensor function.
The possibility to detect tag displacements and to link specific displacements to actions is investigated in this project. The phase and the magnitude of the backscattered signal around the resonance frequency of the tag scatterers can be used to compute the position of the current tag and then to detect tag displacements [Bar19]. However, more relevant information could be extracted based on the Doppler effect. Indeed, tag motion (a tag can be considered as a target) induces a Doppler frequency shift. From a theoretical and practical point of view, the detection of this frequency could potentially increases significantly the read range of chipless tags. This is due to the fact, that only the signal coming from this moving tag will produce this frequency, so it will be possible to isolate easily the signal coming from the tag to the backscattered signal coming from the surrounding environment. Form general radar theory, micro-Doppler effect [Chen06] could also the used to increase the performance in reading of chipless tags. Indeed, micro-Doppler effect can be observable when any target undergoes micro-motion dynamics (such as mechanical vibrations or rotations). In such a case Doppler modulations are induced on the returned signal from these micro-motion dynamics.
[Bar19] N. Barbot, E. Perret, “Accurate Positioning System Based on Chipless Technology” Sensors, 2019, 19, 1341. This article belongs to the Special Issue Passive Electromagnetic Sensors for Autonomous Wireless Networks.
[Che06] V. C. Chen, F. Li, S. -. Ho and H. Wechsler, "Micro-Doppler effect in radar: phenomenon, model, and simulation study," in IEEE Transactions on Aerospace and Electronic Systems, vol. 42, no. 1, pp. 2-21, Jan. 2006, doi: 10.1109/TAES.2006.1603402.
The main goal of the work is to show that the general performance of chipless RFIS systems can be significantly improved by using the Doppler effect. This work will be done theoretically and practically. New Chipless tags optimized for this purpose will be introduced. A new way to interrogate chipless tag will also be introduced. The results of this work will be applied to develop Gesture Recognition Applications. Sensor applications will be also considered.
Candidate profile: Master of Science in Electrical Engineering - RF/Microwaves. A good level of spoken and written English is required.
Keywords: Radio systems, RF design, Radar approaches, chipless RFID.
Software: CST, HFSS, Matlab
Where: LCIS, Grenoble Institute of Technology, Valence, France
When: 1. October 2020 – 30 September 2023
How to apply: Interested candidate should send a detailed CV, motivation letter and the contact details of three references by email to Etienne Perret | Etienne.Perret@lcis.grenoble-inp.fr
Net income around 1420 € / monthsApprenez-en davantage
|Intitulé||Doctoral Candidate in RF - Chipless RFID detection based on Doppler effect for Gesture Recognition Applications|
|Job location||50 Rue Barthélémy de Laffemas - BP 54, 26902 Valence|
|Publié||juillet 7, 2020|
|Date limite d'inscription||Non Spécifiée|
|Types d'emploi||PhD  |
|Domaines de recherche :||Électromagnétisme,   Ingénierie des communications,   Génie physique,   Physique théorique,   Génie électrique,   Physique appliquée,   Traitement du signal,   Électronique  |