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Reference : UMR6164-MAXZHA-008
Workplace : RENNES,RENNES
Date of publication : Friday, October 09, 2020
Type of Contract : FTC Scientist
Contract Period : 18 months
Expected date of employment : 1 January 2021
Proportion of work : Full time
Remuneration : Entre 2800 € et 3200 € brut / mois selon expérience
Desired level of education : PhD
Experience required : Indifferent
This interdisciplinary project focuses on near-field millimeter-wave human exposure assessment applied to 5G networks. Interaction of 5G terminals with the human body not only affects the wireless performance of the system but requires careful consideration of user exposure to electromagnetic fields. This includes millimeter-wave exposure by wearable and mobile devices resulting in local absorption under near-field exposure conditions . The existing dosimetry approaches—originally developed for 3G/4G networks operating in sub-6 GHz range—are not directly scalable to millimeter-waves. This motivates our research towards new solutions for accurate experimental dosimetry in 24 GHz and 60 GHz bands . This project builds on the unique scientific and technical expertise of the IETR laboratory of CNRS in the fields of bioelectromagnetics and complex radiating systems.
Existing experimental millimeter-wave dosimetry techniques are limited to electromagnetic field measurements using free-space probes in vicinity of wireless devices. These solutions do not account for the effects of the close vicinity to human body and therefore introduce significant error into estimated exposure levels. To overcome these limitations, we proposed an alternative approach based on a solid skin-equivalent model in the 60 GHz band . This solid tissue-equivalent model will be used as a starting point to design a millimeter-wave dosimetry system prototype for measurements of the power density accounting for perturbation of the electromagnetic field radiated by a wireless device in presence of the human body. The project will mainly focus on development of an instrumented system that will integrate two key functionalities: (1) it will accurately reproduce the reflection coefficient from the human skin; (2) it will enable retrieval of the power density based on the field measurements inside the tissue-equivalent model.
 A. Guraliuc, M. Zhadobov, R. Sauleau, L. Marnat, L. Dussopt. Near-field user exposure in forthcoming 5G scenarios in the 60-GHz band. IEEE Transactions on Antennas and Propagation, 65(12), pp. 6606–6615, Dec. 2017.
 M. Zhadobov, C. Leduc, A. Guraliuc, N. Chahat, R. Sauleau. Antenna / human body interactions in the 60 GHz band: state of knowledge and recent advances. Advances in Body-Centric Wireless Communication: Applications and State-of-the-art, IET, pp. 97 – 142, Jun. 2016.
 A. R. Guraliuc, M. Zhadobov, O. De Sagazan, R. Sauleau. Solid phantom for body-centric propagation measurements at 60 GHz. IEEE Transactions on Microwave Theory and Techniques, 62(6), pp. 1373–1380, May 2014.
We seek for highly engaged and motivated candidates with a PhD degree in electro¬magnetics, electrical engineering or electronics. The required skills and qualifications are:
• Strong background in electromagnetics, antenna design and microwave engineering. Knowledge in electronics and / or bioelectromagnetics is welcome but not mandatory.
• Knowledge of numerical modeling and experience with commercial or open-source numerical solvers (e.g. CST, Ansys, SIM4LIFE); programming skills (e.g. MATLAB).
• Fluency in English: the candidate should be conversant and articulate in English and must have strong writing skills. Knowledge of French is not required but would be appreciated.
The candidate will join the IETR laboratory of CNRS. Our research activities in biomedical electromagnetics cover a wide spectrum of fundamental and applied research spreading from multi-physics and multi-scale modeling to advanced technologies for body-centric wireless communications. The team was at the origin of pioneering innovations in biomedical electromagnetics, including the first millimeter-wave tissue-equivalent models, novel reflectivity based surface phantom concept, new broadband multi-physics characterization technique for Debye-type materials, innovative millimeter-wave textile antennas for smart clothes, ultra-robust miniature implantable UHF antennas, and the first millimeter-wave reverberation chamber.
Constraints and risks
To apply please provide (in PDF format):
• CV (incl. the contact details of two professional references [mail, address, position])
• Motivation letter (incl. explanation of interest in the research we conduct and why the candidate believes he/she is suitable for the position)
• Copy of PhD diploma
• Reference letters (optional)
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