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9 results on '"Chahat, N"'

1. Terahertz Antenna Technologies for Space Science Applications

Author

Chattopadhyay, G., Alonso-Delpino, M., Jung-Kubiak, C., Reck, T., Lee, C., Chahat, N., Rahiminejad, S., David González Ovejero, Jet Propulsion Laboratory (JPL), California Institute of Technology (CALTECH)-NASA, Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), NASA-California Institute of Technology (CALTECH), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), and Nantes Université (NU)-Université de Rennes 1 (UR1)

Subjects
terahertz, [SPI]Engineering Sciences [physics], CubeSat, silicon, low-profile, micromachining, SmallSat, antenna
Abstract

International audience; In this review paper we explore different antenna technologies at terahertz frequencies for space science and other applications. We show that the antenna technologies generally used at lower frequencies are difficult to implement at terahertz frequencies. Additionally, one has to take a few extra steps and special care for designing antennas for space-based applications. In this paper, we review different design and implementation options for millimeter-wave and terahertz antennas for space applications. We detail how antenna design has to be a part of the overall system design for the success of the instruments for space missions. We also look into low-mass and low-profile conformal antenna technologies that will have a profound impact on future space instruments at terahertz frequencies. © 2018 KIEES.

Published
2018

2. Antenna/human body interactions in the 60 GHz band: State of knowledge and recent advances

Author

Zhadobov, M., Leduc, C., Guraliuc, A., Chahat, N., Sauleau, R., Institut d'Electronique et de Télécommunications de Rennes (IETR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES), Nantes Université (NU)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), California Institute of Technology (CALTECH)-NASA, and Université de Nantes (UN)-Université de Rennes 1 (UR1)

Subjects
Body-centric mmw applications, Antenna-human body interactions, Frequency 60 ghz, Near field interactions, Standard methodologies, Exposure metric, Body proximity, [SPI.TRON]Engineering Sciences [physics]/Electronics, Radio networks, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Near-field exposure, Exposure assessment, Antennas, Wireless device radiation
Abstract

International audience; In this chapter, we presented a review of the state-of-the-art, recent advances, and remaining challenges in the field of antenna/human body interactions in the 60 GHz band, with a particular emphasis on the near-field interactions that may occur in emerging body-centric MMW applications. For new near-field exposure scenarios expected to appear in coming years, today there is no any clear regulation in terms of the exposure assessment, and standard methodologies for compliance testing are not available in the 60 GHz band. Most of the exposure guidelines and standards recommend IPD as a dosimetric quantity. It cannot be directly used as a metric for near-field exposures since practically it is very challenging, if not impossible, to determine numerically or experimentally local IPD under near-field conditions. Some reports suggest that temperature rise could be used as an exposure metric at MMW. However, in practice, it is not always possible because of some limitations discussed in this chapter. We suggest to use eIPD as a metric; it can be conveniently retrieved from SAR computations and/or measurements and takes into account the perturbation of the wireless device radiation due to the body proximity. © The Institution of Engineering and Technology 2016.

Published
2016
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3. Wearable textile patch antenna for BAN at 60 GHz

Author

Chahat, N., Maxim Zhadobov, Sauleau, R., Institut d'Électronique et des Technologies du numéRique (IETR), Nantes Université (NU)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), and Université de Nantes (UN)-Université de Rennes 1 (UR1)

Subjects
ComputingMethodologies_GENERAL, ComputingMilieux_MISCELLANEOUS
Abstract

Poster; International audience

Published
2013

4. Yagi-Uda textile antenna for on-body communications at 60 GHz

Author

Chahat, N., Maxim Zhadobov, Sauleau, R., Institut d'Électronique et des Technologies du numéRique (IETR), Nantes Université (NU)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)

Subjects
body-worn antenna, on-body communication, textile antenna, Astrophysics::Instrumentation and Methods for Astrophysics, phantom, millimeter waves, wearable antenna, Computer Science::Other
Abstract

Poster; International audience; A textile Yagi-Uda antenna operating in the 57-64 GHz band is proposed for on-body communications. The antenna characteristics are studied numerically and experimentally in free space and on a skin-equivalent phantom in terms of reflection coefficient, radiation pattern, and efficiency.

Published
2013

7. A compact planar UWB antenna for on-body communications

Author

Chahat, N., Zhadobov, M., Ronan Sauleau, Ito, K., Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Institut d'Electronique et de Télécommunications de Rennes (IETR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), Department of Mathematics [Raleigh NC], North Carolina State University [Raleigh] (NC State), University of North Carolina System (UNC)-University of North Carolina System (UNC), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES), and Nantes Université (NU)-Université de Rennes 1 (UR1)

Subjects
ComputingMilieux_MISCELLANEOUS
Abstract

International audience

8. Theoretical and experimental characterization of on-body propagation at 60 GHz

Author

Valerio, G., Chahat, N., Zhadobov, M., Ronan Sauleau, Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), and Nantes Université (NU)-Université de Rennes 1 (UR1)

Subjects
ComputingMilieux_MISCELLANEOUS
Abstract

International audience

9. Building Partial Discharge Signal Wireless Probes

Author

Fabio Viola, Pietro Romano, Viola F, Romano P, Huitema L, Salgado H, Luo Q, Pereira J, Krasnok A, Belov P, Miroshnichenko A, Kuznetsov AI, Lukyanchuk B, Kivshar Y, Chahat N, Himdi M, Viola, F, and Romano, P

Subjects
Physics, Settore ING-IND/31 - Elettrotecnica, business.industry, Partial discharge, Electrical engineering, Electronic engineering, Wireless, antenna, partial discharges, method of moments, business, Signal
Abstract

This chapter focuses on the evaluation of the performances of different antenna sensors suitable for Partial Discharge (PD) measurements. Monopole, triangular and spherical antennas were simulated by means of the surface method of moments. The transmitting system is modeled by a power electronic device with a fault current between two metal plates. The shape of the simulated, transmitted and received signals, has been compared to verify the sensor that provides the best fidelity among the three. The auto-correlation function and the Pearson correlation index are adopted here for the comparison. A discussion on the dynamic characteristic of the different antenna probes and their use in different application is proposed.

Published
2014
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