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Profiles

Nacer  Chahat's Picture
Address:
4800 Oak Grove Dr.
Pasadena, CA 91109
Phone:
818.354.3908

Nacer Chahat
Microwave / Antenna Engineer

Dr. Nacer Chahat was born in Angers, France, in 1986. Over ten years of experience in design, analysis, and development of antenna for projects ranging from microwave to THz frequencies for communications, RADAR, and imaging systems. His expertise includes wearable and flexible antennas for communications and biotelemetry, satellite communications antennas (spacecraft, cubesat, and Rover), and antennas for remote sensing and radio astronomy instruments. He has a strong experience in design of CMOS RFIC on-chip and off-chip antennas at mm-wave and THz frequencies.

Dr. Nacer Chahat authored and co-authored over 40 technical journal articles and conference papers and has written 1 book chapter. He also holds several patents.

He is a black belt in judo and enjoys soccer, jogging, and outdoor sports, such as rock climbing, scuba diving, mountain hiking, and canyoneering. He is currently working towards his Private Pilot Certificate and is a member of the Aero Association of Caltech/JPL.

Education
  • Ph.D. in Signal processing and Telecommunication, IETR, University of Rennes 1, Rennes, France, Oct. 2012 (Summa cum laude). Dissertation topic: “Antenna, propagation, and interaction with the body for body-centric wireless communications at microwaves and millimeter-waves”.
  • M.Sc. in Electrical Engineering and Radio Communications, Ecole Supérieure d’Ingénieurs de Rennes, University of Rennes 1, Rennes, France, Sept. 2009. Valedictorian and summa cum laude.
  • M.Sc. in Telecommunication, University of Rennes 1, Rennes, France, Sept. 2009.

Research Interests
  • On-chip and off-chip antenna for CMOS technology at millimeter-wave and THz applications.
  • Horn antenna feeds for sub-mm astronomy and cosmic background experiments.
  • Silicon micro-lens antennas for THz integrated arrays.
  • Millimeter waves antennas: planar antennas and antenna arrays, micromachined antennas on silicon, multilayer antennas, antennas in SIW technology, and antennas on very soft polymers (PDMS), and on textile or smart cloths.
  • Periodic structures: Frequency selective surfaces, Fabry-Perot cavities and Electromagnetic band gap materials.
  • Bioelectromagnetics: numerical and experimental dosimetry.

Professional Experience
  • PostDoctoral Fellow at NASA Jet Propulsion Laboratory, Pasadena, CA, since Jan. 2013.
  • PostDoctoral Fellow at IETR, University of Rennes 1, Rennes, Nov.-Dec. 2012.
  • Lecturer in Electromagnetism at the University of Rennes 1, Rennes, France, 2009-2012.
  • Undergraduate Student Researcher at the Graduate School of Engineering, Chiba University, Japan. Research project: Design and characterization of a UWB antenna for on-body communications, Mar.-Aug. 2009.

Selected Awards
  • The Airbus Group Foundation's Best Thesis Prize in France, 2013.
  • Best Ph.D. thesis in FRANCE in Electrical Engineering awarded by club EEA (Enseignants et des chercheurs en Electronique, Electrotechnique et Automatique), 2013.
  • Best Ph.D. thesis of the University of Rennes 1 awarded by Fondation Rennes 1, 2013.
  • IEEE Antennas and Propagation Society Doctoral Research Award, 2012.
  • CST University Publication Award, 2011.
  • Best student paper award of the 33rd Bioelectromagnetics Society Annual Meeting in Halifax (BEMS 2011).

Selected Publications

Book Chapter:

  1. N. Chahat, M. Zhadobov, and R. Sauleau, “Progress in compact antennas,” Chapter 6: “Antennas for body-centric wireless communications at millimeter wave frequencies”, ISBN 980-953-307-1085-4, Intech 2014.

Journal papers

  1. A. R. Guraliuc, N. Chahat, C. Leduc, M. Zhadobov, and R. Sauleau, “End-fire antenna for BAN at 60 GHz: impact of bending, on-body performances, and study of an off-body scenario,” Electronics, vol. 3, no. 1, 2014.
  2. A. R. Guraliuc, M. Zhadobov, G. Valerio, N. Chahat, and R. Sauleau, “Effect of Textile on the Propagation Along the Body at 60 GHz,” IEEE Trans. Antennas and Propagation, vol. 62 no. 3, Mar. 2014.
  3. A. Pellegrini, A. Brizzi, L. Zhang, K . Ali, Y. Hao, X. Wu, C. C. Constantinou, Y. Nechayev, P. S. Hall, N. Chahat, M. Zhadobov, and R. Sauleau, “Antennas and propagation for body centric wireless communications at millimeter wave frequencies: a review,” IEEE Antennas and Propagation Magazine, vol. 55, no. 4, Nov. 2013.
  4. N. Chahat, G. Valerio, M. Zhadobov, and R. Sauleau, “On-body propagation at 60 GHz,” IEEE Transactions on Antennas and Propagation, vol. 61, no. 4, pp. 1876–1888, Apr. 2013.
  5. N. Chahat, M. Zhadobov, and R. Sauleau, “60-GHz textile antenna array for body-centric communications,” IEEE Transactions on Antennas and Propagation, vol. 61, no. 4, pp. 1816–1824, Apr. 2013.
  6. N. Chahat, M. Zhadobov, L. Le Coq, S. Alekseev, and R. Sauleau, “Characterization of the Interactions between a 60-GHz Antenna and the Human Body in an Off-Body Scenario,” IEEE Transactions on Antennas and Propagation, vol. 60, no. 12, pp. 5958–5965, Dec. 2012.
  7. N. Chahat, M. Zhadobov, and R. Sauleau, “Wearable end-fire textile antenna for on-body communications at 60 GHz,” IEEE Antennas Wirel. Propag. Letters, vol. 11, pp. 799–802, 2012.
  8. N. Chahat, M. Zhadobov, and R. Sauleau, “Broadband tissue-equivalent phantom for BAN applications at millimeter waves,” IEEE Transactions on Microwave Theory and Techniques, vol. 60, no. 7, pp. 2259–2266, Jul. 2012.
  9. N. Chahat, M. Zhadobov, S. Alekseev, and R. Sauleau, “Human skin-equivalent phantom for on-body antenna measurements in the 60-GHz band,” Electronics Letters, vol. 48, no. 2, pp. 67–68, Jan. 2012.
  10. N. Chahat, M. Zhadobov, R. Sauleau, and S. Alekseev. “New method for determining dielectric properties of skin and phantoms at millimeter waves based on heating kinetics,”
    IEEE Transactions on Microwave Theory and Techniques, vol. 60, no. 3, pp. 827–832, March 2011.
  11. L.-R. Harris, M. Zhadobov, N. Chahat and R. Sauleau, “Electromagnetic dosimetry for adult and child models within a car: multi-exposure scenarios,” International Journal of Microwave and Wireless Technologies, vol. 3, no. 6, Dec. 2011.
  12. N. Chahat, M. Zhadobov, R. Augustine, and R. Sauleau, “Human skin permittivity models for the millimetre-wave range,” Electronics Letters, vol. 47, no. 7, pp.427–428, March 2011.
  13. M. Zhadobov, N. Chahat, R. Sauleau, C. Le Quement, Y. Le Dréan, “Millimeter-wave interactions with the human body : state of knowledge and recent advances,” International Journal of Microwave and Wireless Technologies, vol. 3, no. 2, pp. 237-247, April 2011.
  14. N. Chahat, M. Zhadobov, R. Sauleau, and K. Ito, “A compact UWB antenna for on-body applications,” IEEE Transactions on Antennas and Propagation, vol. 59, no.4, Apr. 2011.

 Invited Proceedings

  1. A. Tang, G. Chattopadhyay, Z. Chen, T. Reck, H. Schone, Y. Zhao, L. Du, D. Murphy, N. Chahat, E. Decrossas, I. Mehdi, and MF. Chang, “Applications of CMOS mm-wave & THz technology for exploration of deep space and the outer planetary systems,” IEEE Custom Integrated Circuits Conference, San Jose, CA, Sept. 2014.
  2. A. Tang and N. Chahat, “CMOS mm-Wave Transceiver Techniques beyond 50 GHz,” IEEE Global Conference on Signal and Information Processing, Dec. 2013, Austin, Texas, U.S.A.
  3. N. Chahat, G. Valerio, C. Leduc, M. Zhadobov, and R. Sauleau, “Skin-equivalent phantoms, propagation, and antennas for body-centric communications in the 60-GHz band,” IET Seminar on Body-Centric communications in the 60-GHz band, London, England, July. 2013.
  4. N. Chahat, M. Zhadobov, R. Sauleau, K. Ito. “Antenna and propagation study for body-centric wireless communications at millimeter waves,” IET seminar on body-centric wireless communications, London, England, Jun. 27, 2011.
  5. N. Chahat, M. Zhadobov, R. Sauleau, and K. Ito, “A compact planar UWB antenna for on-body communications,” European Conference on Antennas and Propagation (EuCAP), 2011 Roma, Italy, pp. 1306–1309, Apr. 2011.

  Published Proceedings (international conference)

  1. A. Tang, N. Chahat, Y. Zhao, G. Virbila, C. Lee, F. Hsiao, L. Du, R. Shin, Y.-C. Kuan, M.-C. Frank Chang, G. Chattopadhyay, I. Mehdi, “A 65nm CMOS 140 GHz 27.3 dBm EIRP transmit array with membrane antenna for highly scalable multi-chip phase arrays,” MTT-S International Microwave Symposium (IMS), Tampa Bay, Florida, Jun. 2014.
  2. A. Tang, N. Chahat, E. Decrossas, G. Chattopadhyay, and I. Mehdi, “A 94 GHz multi-casting data-link based on 3D-printing compatible dielectric ribbon interconnects,” MTT-S International Microwave Symposium (IMS), Tampa Bay, Florida, Jun. 2014.
  3. G. Chattopadyay, T. Reck, C. Jung-Kubiak, Choonsup Lee, J. Siles, N. Chahat, K. Cooper, E. Schlecht, M. Alonso-delPino, amd I. Mehdi, “Terahertz antennas with silicon micromachined front-end,” European Conference on Antennas and Propagation (EuCAP), Netherlands, April 2014.
  4. M. Zhadobov, N. Chahat, S. I. Alekseev, C. Leduc, A. Guraliuc, and R. Sauleau, “Evaluation of antenna / human body interactions in BAN scenarios at millimeter waves,” Progress in Electromagnetics Research Symposium (PIERS), Stockholm, Sweden, Aug. 2013.
  5. G. Valerio, N. Chahat, M. Zhadobov, and R. Sauleau, "Study of propagation along the body at 60 GHz with analytical models and skin-equivalent phantoms," IEEE Antennas and Propagation Society International Symposium (APSURSI) 2013, pp. 2097–2098, July 2013.
  6. G. Valerio, R. Sauleau, N. Chahat, A. Guraliuc, and M. Zhadobov, "Characterization of on-body communications at millimeter waves," International Conference on Electromagnetics in Advanced Applications (ICEAA), pp. 42–44, 9-13 Sept. 2013.
  7. M. Zhadobov, N. Chahat, R. Sauleau, S. Alekseev, “New method for determining dielectric properties of high water content materials at millimeter waves based on heating kinetics,” Bioelectromagnetics Meeting, Thessaloniki, Greece, Jun. 2013.
  8. N. Chahat, M. Zhadobov, R. Sauleau, “Yagi-Uda textile antenna for on-body communications at 60 GHz,” European Conference on Antennas and Propagation (EuCAP), Suède, April 2013.
  9. N. Chahat, M. Zhadobov, R. Sauleau, “Wearable textile patch antenna for BAN at 60 GHz,” European Conference on Antennas and Propagation (EuCAP), Suède, April 2013.
  10. N. Chahat, M. Zhadobov, R. Sauleau, “Antennas and interaction with the body for body-centric wireless communications at millimeter-waves,” European Conference on Antennas and Propagation (EuCAP), Suède, April 2013.
  11. G. Valerio, N. Chahat, M. Zhadobov, R. Sauleau, “Theoretical and experimental characterization of on-body propagation at 60 GHz,” European Conference on Antennas and Propagation (EuCAP), Suède, Avril 2013.
  12. M. Zhadobov, N. Chahat, S. Alekseev, R. Sauleau., “Millimeter-wave Dosimetry for bioEM and BAN Applications,” Progress in Electromagnetics Research Symposium (PIERS 2012), Moscow, Russia, p. 265, Aug. 2012.
  13. N. Chahat, M. Zhadobov, and R. Sauleau, “Skin-equivalent phantom for on-body antenna measurements at 60 GHz,” European Conference on Antennas and Propagation (EuCAP), Prague, Czech Republic, Mar. 2012.
  14. N. Chahat, M. Zhadobov, R. Sauleau, K. Ito, “Dual-band wearable textile antenna with reduced backward radiation,” IET seminar on body-centric wireless communications, London, England, Jun. 27, 2011.
  15. M. Zhadobov, N. Chahat, Y. Le Dréan, C. Le Quément, and R. Sauleau, “Interactions of 60 GHz radiations with the human body,” 33rd Bioelectromagnetics Meeting, Halifax, Canada, June 2011.
  16. N. Chahat, M. Zhadobov, and R. Sauleau, “SAR reduction technique for future on-body communications: application to a dual-band textile antenna,” 33rd Bioelectromagnetics Meeting, Halifax, Canada, June 2011.
  17. N. Chahat, M. Zhadobov, and R. Sauleau, “On-body characterization of a wearable millimeter-wave antenna for body-centric applications,” 33rd Bioelectromagnetics Meeting, Halifax, Canada, June 2011.
  18. N. Chahat, M. Zhadobov, R. Augustine, and R. Sauleau, “From human skin permittivity measurements up to 65 GHz to development of skin-equivalent phantoms for body-centric applications,” 33rd Bioelectromagnetics Meeting, Halifax, Canada, June 2011.
  19. N. Chahat, M. Zhadobov, R. Sauleau, and K. Mahdjoubi, “Parametric Analysis of On-Body Dual-Band Antenna Performances: Dependence on the Human Body Morphology,” European Conference on Antennas and Propagation (EuCAP), pp. 437–440, Roma, Italy, 2011.
  20. N. Chahat, M. Zhadobov, R. Sauleau, and K. Mahdjoubi, “Improvement of the on-body performance of a dual-band textile antenna using an EBG structure,” Antennas and Propagation Conference (LAPC), 2010 Loughborough, UK, pp. 465–468, Nov. 2010.
  21. N. Chahat, M. Zhadobov, R. Sauleau, and K. Ito, “Design and characterization of an UWB wearable antenna,” Antennas and Propagation Conference (LAPC), 2010 Loughborough, UK, pp. 461–464, Nov. 2010.

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