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Nacer  Chahat's Picture
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4800 Oak Grove Dr.
Pasadena, CA 91109
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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 UHF to THz frequencies for communications, RADAR, and imaging systems. His expertise includes satellite communications antennas (fo spacecraft, CubeSat, and Rover), wearable and flexible antennas for communications and biotelemetry, and antennas for remote sensing and radio astronomy instruments.

He authored and co-authored over 50 technical journal articles and conference papers, has written 2 book chapters, and also holds 6 patents. He accomplished a six-month master's training period as a special research student in 2009 at the Graduate School of Engineering, Chiba University, Chiba, Japan. His current research fields are CubeSat antennas, millimeter-wave antennas, spacecraft antennas, terahertz antennas, and telecommunication systems.

He was elevated IEEE Senior member at only 28 years old. He is a black belt in judo and enjoys soccer, flying (Cessna 152), and outdoor sports, such as rock climbing, scuba diving, mountain hiking, and canyoneering.

Several press releases about his work can be found here: ECH antenna for SWOT, and Zero Power WiFi technology.

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
  • IEEE Senior member in 2015.
  • 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.
  2. N. Chahat, A. Tang, G. Valerio, M. Zhadobov, Anda Guraliuc, and R. Sauleau, “Antennas, Phantoms, and Body-centric propagation at millimeter waves,” in “Electromagnetics of Body-Area Networks: Antennas, Propagation, and RF Circuits,” Wiley/IEEE Press, in press.

Patents

  1. Microwave Reflector Link for Wireless LAN, WIFI, Bluetooth and other Wireless-Data Link and Connectivity Applications, US #62/025,788, July 17, 2014.
  2. Low Power Multi-Gb/s mm-Wave Data-link Employing Modulated Reflections, US #61/972,623, March 31, 2014.
  3. CDMA-Spread Spectrum Reflector Apparatus for Reduction of Unmodulated Ambient Blockers in Reflected Data Links, US #62/066,838.
  4. Dielectric waveguides splitter and hybrid/isolator for bidirectional link, US #61/941,886, February 19, 2014.
  5. Inkjet or pen based printed periodic directors for millimeter-wave links on flexible substrates, US #61/974,898, April 3, 2014.
  6. Lens coupled dielectric waveguides, US #14/658,411, March 16, 2015.

Journal papers

  1. N. Chahat, T. Reck, C. Jung-Kubiak, T. Nguyen, R. Sauleau, and G. Chattopadhyay, “1.9 THz multi-flare angle horn optimization for space instruments,” IEEE Trans. Terahertz Science Technology, under review.
  2. N. Chahat, L. Amaro, C. Wang, J. A. Harold, and S. A. Butman, “X-band externally corrugated horn (ECH) telecom antenna and multipath interference on NASA’s SWOT mission,” IEEE Trans. Antennas and Propagation, under review.
  3. N. Chahat, J. Sauder, M. Thomson, R. Hodges, and Y. Rahmat-Samii, “CubeSat Deployable Ka-band reflector antenna development for Earth Science Mission,” IEEE Trans. Antennas and Propagation, under review.
  4. N. Chahat, A. Tang, C. Lee, R. Sauleau, and G. Chattopadhyay, “Efficient CMOS Systems with Beam-Lead Interconnects for Space Instruments,” IEEE Transactions on Terahertz Science and Technology, accepted.
  5. 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.
  6. 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.
  7. 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.
  8. 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.
  9. 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.
  10. 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.
  11. 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.
  12. 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.
  13. 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.
  14. 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,”
  15. IEEE Transactions on Microwave Theory and Techniques, vol. 60, no. 3, pp. 827–832, March 2011.
  16. 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.
  17. 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.
  18. 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.
  19. 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.

Published Proceedings (international conference)

  1. N. Chahat, J. Sauder, R. Hodges, M. Thomson, and Y. Rahmat-Samii, “CubeSat deployable Ka-band reflector antenna for deep space missions,” APS/URSI 2015, Vancouver, Canada, July 2015.
  2. G. Chattopadhyay, T. Reck, N. Chahat, C. Lee, C. Jung-Kubiak, B. Karasik, M. Alonso-delPino, and N. Llombart, “Terahertz Antennas and Optical Elements,” APS/URSI 2015, Vancouver, Canada, July 2015.
  3. R. Hodges, D. Hoppe, M. Radway, and N. Chahat, “Novel deployable reflectarray antennas for CubeSat communications”, IEEE MTT-S International Microwave Symposium (IMS), Phoenix, Az, May 2015.
  4. N. Chahat and Richard Hodges, “Enabling deep space CubeSat missions: Telecommunication challenge”, MARS CubeSat/NanoSat Workshop, Pasadena, CA, Nov 2014.
  5. 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.
  6. 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.
  7. 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.
  8. A. Tang, N. Chahat, Y. Kim, L. Du, L. Kong, G. Virbila, Y. Kuan, C. Lee, G. Chattopadhyay, T. Reck, I. Mehdi, M. F. Chang “A 95 GHz centimeter scale precision confined pathway system-on-chip navigation processor for autonomous vehicles in 65nm CMOS,” IEEE International Microw. Symp., Phoenix, AZ, USA, May 2015.
  9. M. Zhadobov, A. Guraliuc, N. Chahat, and R. Sauleau, “Tissue-equivalent phantoms in the 60-GHz band and their application to the body-centric propagation studies,” IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-Bio), Nov. 2014.
  10. A. Tang, N. Chahat, and E. Decrossas, “CMOS THz communication links for wireless applications: Where do they fit into mobile access and fixed access?,” International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz), Sept. 2014.
  11. N. Gautam, J. Kawamura, N. Chahat, B. Karasik, P. Focardi, S. Gulkis, L. Pfeiffer, and M. Sherwin, “Tunable antenna coupled intersubband terahertz detector,” International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz), Sept. 2014.
  12. A. R. Guraliuc, M. Zhadobov, G. Valerio, R. Sauleau, and N. Chahat, "On-body propagation at 60 GHz: Impact of a textile presence," IEEE Antennas and Propagation Society International Symposium (APSURSI), pp. 715-716, July 2014.
  13. 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.
  14. 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.
  15. A. R. Guraliuc, M. Zhadobov, G. Valerio, R. Sauleau, and N. Chahat, "On-body propagation at 60 GHz: Impact of a textile presence," IEEE Antennas and Propagation Society International Symposium (APSURSI), pp. 715-716, July 2014.
  16. 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.
  17. A. R. Guraliuc, M. Zhadobov, G. Valerio, N. Chahat, and R. Sauleau, "Characterization of the body-centric propagation channel at 60 GHz in the presence of textiles," European Conference on Antennas and Propagation (EuCAP), pp. 3575-3577, April 2014.
  18. 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.
  19. 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.
  20. 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.
  21.  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.
  22. 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, Avril 2013.
  23. N. Chahat, M. Zhadobov, R. Sauleau, “Wearable textile patch antenna for BAN at 60 GHz,” European Conference on Antennas and Propagation (EuCAP), Suède, Avril 2013.
  24. 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, Avril 2013.
  25. 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.
  26. 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.
  27. 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.
  28. 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.
  29. 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.
  30. 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.
  31. 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.
  32. 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.
  33. 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.
  34. 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.
  35. 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.
  36. 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.
  37. 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.
  38. N. Chahat, M. Zhadobov, R. Sauleau, and K. Mahdjoubi, “Amélioration des Performances d’une Antenne Textile Double-Bande Positionnée sur le Corps,” 17èmes journées Nationales Microondes, Brest, France, May. 18-20, 2011.
  39. N. Chahat, M. Zhadobov, and R. Sauleau. “Conception et Caractérisation d’une Antenne Ultra Large Bande pour les Communications sur le Corps,” 17èmes journées Nationales Microondes, Brest, France, May. 18-20, 2011.
  40. N. Chahat, M. Zhadobov, R. Augustine, and R. Sauleau, “Développement d’un modèle humain dans la bande millimétrique pour les applications BANs,” 17èmes journées Nationales Microondes, Brest, France, May. 18-20, 2011.

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