Prof. Ratnajit Bhattacharjee

Professor, Department of Electronics and Electrical Engineering &
Head, Mehta Family School of Data Science and Artificial Intelligence

Email: ratnajitiitg.ac.in, head.mfsdsaiiitg.ac.in
Phone: +91-361-258-2503
Fax: +91-361-2582542, 2690762
Office Address: Room No. #204, G-Block, Academic Complex, IIT Guwahati

Research Areas: Microwave Engineering, Microstrip Antennas, Electromagnetics, Wireless Communication

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Brief CV of Prof. Ratnajit Bhattacharjee

Ratnajit Bhattacharjee is a Professor (HAG Scale) in the Department of Electronics and Electrical Engineering, IIT Guwahati. He joined the Institute in the year 2002. His research interests include Wireless communication, Wireless networks, Microstrip antennas, Microwave Engineering and Electromagnetics. He has co-authored about two hundred research papers and three patents. Twenty-three research students have completed their PhD under his supervision. He has served as Head, Electronics and Electrical Engineering, IIT Guwahati, from 2011 to 2014 and Head for the Computer and Communication Centre, IIT Guwahati from 2021 to 2025. He is the founding Head for the Mehta Family School of Data Science and Artificial Intelligence, IIT Guwahati and also Head for the Manekshaw Centre of Excellence for National Security and Research, IIT Guwahati. He served as General Chair for 5th edition of IEEE Applied Electromagnetic Conference, AEMC 2015 and 22nd National Conference on Communications, NCC 2016. He has delivered invited talks in a number of conferences, symposia and workshops. He has developed a web course on Electromagnetic theory and MOOC video course on Microwave Engineering under NPTEL. He has also been PI and Co-PI for several research projects. He served as chief Investigator for Ministry of Electronics and Information Technology (MeitY) sponsored project for setting up of an Electronics & ICT academy at IIT Guwahati. He is a member of the Research Advisory Committee of SAMEER and served as a member of the Lab Research Council of LRDE, DRDO.

He did his B.E. (Hons) in Electronics and Tele-communication from REC (at present NIT) Silchar, M. Tech. degree (Microwave Engineering) from IIT Kharagpur, and the Ph.D. degree in Engineering from Jadavpur University, Kolkata. Prior to joining IIT Guwahati, he served as a faculty member in REC (at present NIT) Silchar from 1991 to 2002.

Education

My Education


B.E.

REC (at present NIT) Silchar (Gauhati University)

Electronics and Telecommunication

M. Tech.

IIT Kharagpur

Microwave Engineering specialization

Ph.D.

Jadavpur University, Kolkata

Engineering

Publication

Journal Publications (2015 onwards)

  1. Arijit Roy, Salil Kashyap and Ratnajit Bhattacharjee, “Wireless Energy Transfer Using Chirp Waveform with Joint Subband Selection and Max-Min Power Control for IoT Networks”, IEEE Transactions on Green Communications and Networking, Vol. 8(4), pp. 1607 – 1621, 2024
  2. J. Gupta, R. Bhattacharjee, S. Kanagaraj, and D. Sikdar, “Improving Signal‐to‐Noise Ratio of 1.5 T MRI Scans Using High‐Q Resonators Based on Coupled Octa‐Spirals,” Advanced Theory and Simulations, Wiley VCH (2023)
  3. J. Gupta, P. Das, R. Bhattacharjee, and D. Sikdar, “Resonating sub-wavelength metallic wires-based pads for boosting signal-to-noise ratio of birdcage head coils at 1.5T MRI,” Results in Physics, Elsevier (2023)
  4. J. Gupta, P. Das, R. Bhattacharjee, and D. Sikdar, “Enhancing Signal-to-Noise Ratio of Clinical MRIs using RF Metasurface-inspired Flexible Wraps,” Applied Physics A, Springer Nature (2023)
  5. P. Das, J. Gupta, D. Sikdar, and R. Bhattacharjee, “A non-linear triangular split-ring based metaresonator for targeted scanning at 1.5T MRI,” Physica Scripta, IOP Science (2023).
  6. Priyanka Das, Jegyasu Gupta, Debabrata Sikdar, Ratnajit Bhattacharjee, “Aperture–patch sandwich metasurface for magnetic field enhancement in 1.5 T MRI”, Magnetic Resonance Imaging, Vol. 100, pp. 1-9, 2023
  7. Arijit Bhattacharjee, Ratnajit Bhattacharjee, Sanjay Kumar Bose, “DS-SOP: An Adaptive Framework for Enhanced Connectivity in mmWave Indoor Networks”, IEEE Communications Letters, Vol. 27(2), pp. 741 - 745, 2023
  8. Narugopal Nayek, Ramesh Kumar Sonkar, Tapeshwar Tiwari, Ratnajit Bhattacharjee, “Design and Analysis of Truncated Velocity Tapered Sine-Waveguide Structure for Traveling-Wave Tube in THz Band”, IEEE Transactions on Plasma Science, Vol. 50 (11), pp. 4759-4766, 2022
  9. Priyanka Das, Jegyasu Gupta, Debabrata Sikdar, Ratnajit Bhattacharjee, “A thin metallo-dielectric stacked metamaterial as “add-on” for magnetic field enhancement in clinical MRI”, Journal of Applied Physics, Vol. 132(11), 2022
  10. Jawed Qumar, S Christopher, Ratnajit Bhattacharjee, “Multidynamic Radar: A Concept for Strategic Air Surveillance System”, IEEE Sensors Letters, Vol. 5 (12), 2021
  11. Narugopal Nayek, Mohit Kumar Joshi, Ramesh Kumar Sonkar, Tapeshwar Tiwari, Ratnajit Bhattacharjee, “Design and Analysis of Width-Modulated Two-Section Sine Waveguide for G-Band Traveling-Wave Tube”, IEEE Transactions on Electron Devices, Vol. 68 (12), pp. 6458 – 6464, 2021
  12. Dibyajyoti Das, Prabin Kumar Bora, Ratnajit Bhattacharjee, “Automatic modulation classification over MIMO amplify and forward (AF)-relay fading channels”. Physical Communication, Vol. 47, 2021
  13. Arijit Bhattacharjee, Ratnajit Bhattacharjee, Sanjay Kumar Bose, “An Approach for Mitigation of Beam Blockage in mmWave based Indoor Networks”, IEEE Internet of Things Journal
  14. Arijit Roy, Harshal B Nemade, Ratnajit Bhattacharjee, “Radar waveform diversity using nonlinear chirp with improved sidelobe level performance”, AEU-International Journal of Electronics and Communications, Vol. 136, 2021
  15. P. Anoop and Ratnajit Bhattacharjee, "Investigation on Dual-band Equilateral Triangular shaped Dielectric Resonator Antennas for WLAN Applications”, International Journal of RF and Microwave Computer-Aided Engineering, Vol. 31 (7), 2021
  16. Kaushik Debbarma and Ratnajit Bhattacharjee, “Small Offset Reflector with Matched Feed for 5G Application”, IETE Journal of Research, 1-7, 2021
  17. Arijit Bhattacharjee, Ratnajit Bhattacharjee, Sanjay Kumar Bose, “PACTA: A Portfolio Theory Based Approach for QoS Aware Resource Allocation in mmWave Networks”, IEEE Communications Letters, 24(8), 2020
  18. Narugopal Nayek, Mohit Kumar Joshi, Ramesh Kumar Sonkar, Tapeshwar Tiwari and Ratnajit Bhattacharjee, “Design and Efficiency Enhancement of a Ka-Band Industrial Gyrotron”, IEEE Transactions on Plasma Science, 48(11), 2020
  19. Mohit Kumar Joshi, Sandeep Kumar Vyas, Tapeshwar Tiwari, Ratnajit Bhattacharjee, “Particle-in-cell simulation and analysis of 28-vane megawatt-class pulsed power coaxial magnetron in X-band”, IEEE Transactions on Plasma Science, 48(6),2020
  20. Mohit Kumar Joshi, Sandeep Kumar Vyas, Tapeshwar Tiwari, Ratnajit Bhattacharjee, “A New Approach for High-Power Coaxial Magnetron Using Stacked Anode Resonators”, IEEE Transactions on Electron Devices, 67(4), 2020.
  21. Mohit Kumar Joshi, Narugopal Nayek, Tapeshwar Tiwari, Jan Pidanic, Zdenek Nemec, Ratnajit Bhattacharjee, “Multiphysics and Multipactor Analyses of TE022 Mode High-Power X-band RF Window”, IEEE Microwave and Wireless Components Letters, 30(3), 2020.
  22. Mohit Kumar Joshi, Narugopal Nayek, Tapeshwar Tiwari, Ratnajit Bhattacharjee “Design and Analysis of Overmoded RF Window for High-Power Applications in X-band”, IEEE Transactions on Plasma Science, 48(1),2019.

  23. Kaushik Debbarma and Ratnajit Bhattacharjee, “Microstrip patch antenna feed for offset reflector antenna for dual band application”, International Journal of RF and Microwave Computer-Aided Engineering, 29(12) 2019.
  24. Kaushik Debbarma and Ratnajit Bhattacharjee, “Matched feeds for offset reflector antenna using circular microstrip patch antenna”, International Journal of RF and Microwave Computer-Aided Engineering, 29 (11), 2019.
  25. P. Anoop and Ratnajit Bhattacharjee, “Investigation on a new compact wideband rhombic dielectric resonator antenna”, International Journal of RF and Microwave Computer-Aided Engineering, 29 (9), 2019.
  26. Mohit Kumar Joshi and Ratnajit Bhattacharjee, “Design of a rectangular waveguide to cylindrical cavity mode launcher for TE011 mode with maximum quality‐factor”, International Journal of RF and Microwave Computer-Aided Engineering, 29 (9), 2019.
  27. Mrinmoy Bharadwaj, Jitendra Prajapati, and Ratnajit Bhattacharjee, “Analytical Modelling of Terahertz Photomixing Antennas”, IETE Journal of Research, 1-12, 2019.
  28. Arijit Roy, Harshal B Nemade, and Ratnajit Bhattacharjee, “Symmetry Chirp Modulation Waveform Design for LEO Satellite IoT Communication”, IEEE Communications Letters, 23(10), 2019.
  29. Arijit Roy, Harshal B Nemade, and Ratnajit Bhattacharjee, “Multiuser PSK-Chirp-BOK Communication System Under Co-channel Interference”, IEEE Transactions on Circuits and Systems II: Express Briefs, 67(3), 2019.
  30. Mrinmoy Bharadwaj, Jitendra Prajapati, and Ratnajit Bhattacharjee, “Novel graphene based antennas for the terahertz region”, Semiconductor Science and Technology, 34(1), 2019.
  31. Jitendra Prajapati, Mrinmoy Bharadwaj, Amitabh Chatterjee and Ratnajit Bhattacharjee, “Radiation field analysis of photoconductive antenna using an improved carrier dynamics”, Semiconductor Science and Technology, 34(2), 2019.
  32. Dibyajyoti Das, Prabin Kumar Bora, and Ratnajit Bhattacharjee, “Blind Modulation Recognition of the Lower Order PSK Signals Under the MIMO Keyhole Channel”, IEEE Communications Letters, 22(9), 2018.
  33. Mohit Kumar Joshi, Sandeep Kumar Vyas, Tapeshwar Tiwari, and Ratnajit Bhattacharjee, “Optimal Design of a Coaxial Cavity Based on Quality-Factor Maximization for High-Power Coaxial Magnetron in X-Band”, IEEE Transactions on Plasma Science, 46(3), 2018.
  34. Kukil Khanikar, Rohit Sinha, and Ratnajit Bhattacharjee, “Cooperative spectrum sensing using quantized energy statistics in the absence of dedicated reporting channel”, IEEE Transactions on Vehicular Technology, 67(5), 2018.
  35. Jitendra Prajapati, Mrinmoy Bharadwaj, Amitabh Chatterjee and Ratnajit Bhattacharjee, “Magnetic Field-Assisted Radiation Enhancement from a Large Aperture Photoconductive Antenna”, IEEE Transactions on Microwave Theory and Techniques, 66(2), 2018.
  36. Rajib Jana and Ratnajit Bhattacharjee, “Wideband Matched Feed Design Employing Conjugate Field Radiated from a Square Choke Excited by Two Slots on a Diagonal Waveguide”, Progress In Electromagnetics Research, 63, 2018.
  37. Deepak Joshi, Satyabrata Dash, HS Jatana, Ratnajit Bhattacharjee, and Gaurav Trivedi, “Analog circuit optimization using adjoint network based sensitivity analysis”, AEU-International Journal of Electronics and Communications, 82, 2017.
  38. Arijit Roy, Harshal B Nemade, and Ratnajit Bhattacharjee, “DQPSK modulation and demodulation using SAW device”, IET Communications, 11(17), 2017.
  39. Somen Bhattacharjee, Rakhesh S. Kshetrimayum, and Ratnajit Bhattacharjee, “On the Theoretical Analysis of Radiation Pattern and Gain of Printed Monopole Antennas”, ACES Journal, 32(9), 2017.
  40. AN Yadav and Ratnajit Bhattacharjee, “Dual-band balanced-to-unbalanced out-of-phase equal power divider”, Microwave and Optical Technology Letters, 59(8), 2017.
  41. Ramesh Chandra Mishra and Ratnajit Bhattacharjee, “Performance analysis of adaptive DFE using set-membership binormalized data-reusing LMS algorithm for frequency selective MIMO channels”, AEU-International Journal of Electronics and Communications, 77, 2017.
  42. Jitendra Prajapati, Mrinmoy Bharadwaj, Amitabh Chatterjee and Ratnajit Bhattacharjee, “Circuit modeling and performance analysis of photoconductive antenna”, Optics Communications, 394, 69-79, 2017.
  43. Amar Nath Yadav and Ratnajit Bhattacharjee, “Unbalanced-to-balanced power divider with arbitrary power division”, Progress In Electromagnetics Research, 76, 2017.
  44. Amar Nath Yadav and Ratnajit Bhattacharjee, “Balanced to unbalanced power divider with arbitrary power ratio”, IEEE Microwave and Wireless Components Letters, 26(11), 2016.
  45. Jitendra Prajapati, Vinay Kumar Boini, Mrinmoy Bharadwaj and Ratnajit Bhattacharjee, “Comments on “Theoretical Modeling of a Photoconductive Antenna in a Terahertz Pulsed System”, IEEE Transactions on Antennas and Propagation, 64(6), 2583-2584, 2016.
  46. Somen Bhattacharjee, Rakhesh S Kshetrimayum, and Ratnajit Bhattacharjee, “Printed monopole antennas on uniaxial substrate: theory and simulation”, Electronics Letters, 52(10), 2016.
  47. Somen Bhattacharjee, Rakhesh S. Kshetrimayum, and Ratnajit Bhattacharjee, “Derivation of potential Green functions for ungrounded dielectric slab and its application in full wave analysis of PMAs”, Journal of Electromagnetic Waves and Applications, 29(16), 2015.
  48. Samar Shailendra, R Bhattacharjee, and Sanjay K Bose, “A multipath variant of SCTP with optimized flow division extension”, Computer Communications, 67, 2015.
  49. Somen Bhattacharjee, Rakhesh S Kshetrimayum, and Ratnajit Bhattacharjee, “On the equivalent circuit, input impedance, reflection coefficient, and bandwidth of printed monopole antenna”, Microwave and Optical Technology Letters, 57(7), 2015.
  50. Sam Darshi and Ratnajit Bhattacharjee, “BER Analysis of Asynchronised Wireless Network in Presence of Non-Identically Distributed Interferers”, Wireless Personal Communications, 82(4), 2015.
  51. Rajib Jana and Ratnajit Bhattacharjee, “Matched feed design employing TE01 and TM11 modes in a smooth walled rectangular waveguide for cross-polar reduction in offset reflector antenna systems”, AEU-International Journal of Electronics and Communications, 69(6), 2015.
  52. R Jana and R Bhattacharjee, “A Novel Matched Feed Structure for Achieving Wide Cross-polar Bandwidth for an Offset Parabolic Reflector Antenna System”, IEEE Antenna and Wireless Propagation Letters, 14, 2015.

PhD Thesis Guidance

Completed and Ongoing

Sl. No. Name
1 Babusena Paul
2 Himanshu Katiyar
3 Sayantan Hazra
4 Samdarshi
5 Rajib Jana
6 Somen Bhattacharjee (Jointly with Prof. Rakhesh Singh Kshetrimayum)
7 Samar Shailendra (Jointly with Prof S. K. Bose)
8 Deepak Joshi (Jointly with Dr. Gaurav Trivedi)
9 Jitendra Prajapati (Jointly with Dr. Amithabh Chatterjee)
10 Kukuil Khanikar (Jointly with Prof. R. Sinha)
11 Amarnath Ydav
12 R. C. Mishra
13 Debasish Deb (Jointly with Dr. A. Vengadarajan, DRDO)
14 Dibyajyoti Das (Jointly with Prof. P. K. Bora)
15 Mohit Kumar Joshi
16 Kaushik Debbarma
17 Mrinmoy Baradwaj
18 P. Anoop
19 Jawed Qumar ( Thesis submitted) ( Jointly with Dr. S. Christopher, DRDO)
20 Arijit Roy (Jointly with Prof. H. B. Nemade)
21 Arijit Bhattacharjee (Recipient of Qualcomm Innovation Fellowship, 2019) (Jointly with Prof. S. K. Bose)
22 Ashim Kumar (Ongoing)
23 Narugopal Nayek (Jointly with Dr. R. K. Sonkar)
24 Mahari Berhe Tsegay (Ongoing) (Jointly with Dr. Kalpana Dhaka)
25 Priyanka (Ongoing) (Jointly with Dr. A.V.G Subramanyam, ISRO)
26 Shashank Kumar Srivastava (Ongoing) (Jointly with Dr. Mahima Arrawatia)
27 Tanmoy Mandal (Ongoing) ( Jointly with Dr. Srinivasan Krishnaswamy)

Details of recent research and development projects

Sl. No. Details
1 Development of signal and channel models, circuits, and antennas for next generation wireless systems with emphasis on vehicular communication.
Funding agency: Ministry of Electronics and Information Technology (CC&BT Group)
Duration: 01/2021-01/2024
PI: Prof. Ratnajit Bhattacharjee
Co-PIs: Dr. Mahima Arrawatia, Dr. Salil Kashyap, Dr. Sudarashan Mukerjee, Dr. Ribhu, Dr. Kalpana Dhaka, Dr. Moumita Patra, Prof. Rohit Sinha
2 Development of thin flexible metamaterials as add-ons to MRI-scanners for making MRI more efficient, affordable, and accessible
Funding agency: iHUB Divyasampark, Technology Innovation Hub (TIH), Roorkee
Duration: Oct 2021-Oct 2024
PI: Dr. Debabrata Sikdar
Co-PIs: Prof. Ratnajit Bhattacharjee and Prof. S. Kanagaraj
Other investigators: Dr. Akash Handique (NEIGRIHMS Hospital), Dr. Kangkana Mahanta (GNRC Hospital), Dr. Hanif Laskar (GNRC Hospital), Col. Ravikant Narain (Army Hospital)
Industry Partner: Medirays Corporation
3 6G: THz Test bed with Orbital Angular Momentum and Multiplexing
Funding agency: DoT
Duration: Nov 2023-Nov 2026
Consortium of SAMEER, IIT-M, IIT-P, IIT-G PI from IITG: Prof. Ratnajit Bhattacharjee
Co-PIs: Dr. Debabrata Sikdar, Dr. Mahima Arrawatia and Dr. Ashwini Sawant
4 Byzantine-Robust and Communication-Efficient Federated Learning for IoT Networks
Funding agency: TIH Foundation for IoT and IoE (TIH-IoT), IIT Bombay
Duration: 2024 - 2026
PI: Dr. Arghyadip Roy
Co-PIs: Dr. Prashant Patil and Prof. Ratnajit Bhattacharjee
Collaborator: Mr. Kaushlendra Singh Sisodia, UniConverge Technologies Pvt. Ltd.

Details of Patents

Sl. No. Details
1 HIGH-POWER COAXIAL MAGNETRON USING STACKED ANODE RESONATORS WITH MULTI-CATHODE ARRANGEMENT
JOSHI MOHIT KUMAR | BHATTACHARJEE RATNAJIT | VYAS SANDEEP KUMAR | TIWARI TAPESHWAR
Patent No. IN201931050517A Engineering and Technology Published
Filed 2019-12-06 Published 2020-01-17
2 SYSTEM FOR SIMULTANEOUS WIRELESS INFORMATION AND ENERGY TRANSFER IN A HETEROGENEOUS NETWORK AND METHOD THEREOF
ARIJIT ROY | SALIL KASHYAP | RATNAJIT BHATTACHARJEE
Patent No. 433737 Engineering and Technology Granted
Filed 2021-12-03 Published 2023-06-05
3 Title of the invention: A METASURFACE-INSPIRED FLEXIBLE STRUCTURE FOR BOOSTING THE SIGNAL-TO-NOISE RATIO (SNR) IN 1.5TMRI SCANS
Application No.202311058391 A Publication Date: 22/12/2023
Inventors: JEGYASU GUPTA, PRIYANKA DAS, RATNAJIT BHATTACHARJEE & DEBABRATA SIKDAR