Profile picture for user mthottappan.ece

Dr. M. Thottappan

Associate Professor
Department of Electronics Engineering, Indian Institute of Tech
Phone No(s): +91-542-716-5424
Email: mthottappan.ece@iitbhu.ac.in
Area of Interest: RF & Microwave Engineering, High Power Microwave (HPM) Devices
                    Vist my Website

M. Thottappan obtained his Ph.D. in the area of "Millimeter-Wave High Power Devices" from the Indian Institute of Technology (BHU), Varanasi, in 2013 and he was awarded UK Commonwealth Professional Fellowship-2017 to work at the Department of Engineering, Lancaster University, Lancaster, UK.

His current research interests include:

  • Millimetre Wave / Terahertz Devices and Their Applications.
  • RF Circuit Design and Solid-State Sources.
  • High Power Microwaves, Mode Convertors, and Power Combiners for Microwave / Millimeter-Wave Applications.

Under Graduate Course

  • Electromagnetic Waves and Transmission Lines

Post Graduate Course

  • Microwave Power Electronic Devices and their Applications
  1. Pratibha Verma and M. Thottappan, "Design and Simulation Investigations of an X-Band Klystron-Like Relativistic Backward Wave Oscillator with Dual Modulation Cavities,” IEEE Transactions on Electron Devices, vol. 71, no. 5, pp. 3194-3200, May 2024 (10.1109/TED.2024.3375291).
  2. Gundu Venkatesh, S. P. Singh, and M. Thottappan, "A Novel Fast Roll-off Bandpass Frequency Selective Surface for Stealth Applications," Journal of Electromagnetic Waves and Applications, Taylor & Francis Online, vol. 38, no. 5, pp. 571-581, Feb. 2024 (10.1080/09205071.2024.2321279).
  3. Pratibha Verma, V Venkata Reddy and M. Thottappan,"Design and PIC Simulation of a Klystron-like RBWO with Dual Extraction Cavity," Asian Journal of Physics, vol. 32, no. 9-12, pp. 531-538, Dec. 2023.
  4. V Veera Babu, Shyam Gopal Yadav, Smrity Dwivedi and M. Thottappan, "Design and Simulation Studies of a Ka-band Two-Cavity Gyro-Twystron Amplifier," Asian Journal of Physics, vol. 32, no. 9-12, pp. 539-544, Dec. 2023.
  5. Pratibha Verma and M. Thottappan, "Design and Efficiency Enhancement of Klystron-like Relativistic Backward Wave Oscillator with Triple Cavity Extractor,” IEEE Transactions on Electron Devices, vol. 70, no. 4, pp. 1929-1935, April 2023 (10.1109/TED.2023.3246434)
  6. Chandra, Madhavi; Nilotpal; Samantaray, Diptiranjan; Thottappan, Muthiah; Bhattacharyya, Somak;, "A Broad Band Transmissive Type Metasurface Cross-Polarization Converter for EMC Application," IEEE Transactions on Electromagnetic Compatibility, vol. 65, no. 1, pp. 186-194, Feb. 2023 (10.1109/TEMC.2022.3213833).
  7. M. Hemanta Kumar, Sanjeev Sharma, Kuntal Deka, and M.Thottappan, "Reconfigurable Intelligent Surfaces Assisted Hybrid NOMA System," IEEE Communications Letters, vol. 27, no. 1, pp. 357-361, Jan. 2023 (10.1109/LCOMM.2022.3211292).
  8. Gundu Venkatesh, M. Thottappan and S. P. Singh, "Highly Angularly Stable Dual-Band Stop FSS for Blocking Satellite Downlink Frequencies," IEEE Transactions on Electromagnetic Compatibility, vol. 64, no. 6, pp. 2055-2059, Dec. 2022 (10.1109/TEMC.2022.3200212).
  9. Shyam Gopal Yadav, Vangalla Veerababu and M. Thottappan, “Gain and Bandwidth Improvement Studies of Millimeter Wave Periodically Dielectric Loaded Gyro-Twystron Amplifier,” IEEE Transactions on Electron Devices, vol. 69, no. 12, pp. 7059-7066, Dec. 2022 (10.1109/TED.2022.3217760)
  10. Venkata Reddy and M.Thottappan, " Design and Simulation Investigations of Dual-Band RBWO Using Sectional Slow Wave Structures for Long Pulse Generation,” IEEE Transactions on Electron Devices, vol. 69, no. 10, pp. 5858-5864, Oct. 2022 ( 10.1109/TED.2022.3201834).
  11. M. Hemanta Kumar, Sanjeev Sharma, Kuntal Deka, and M. Thottappan, “Multiple Reconfigurable Intelligent Surfaces Assisted Downlink NOMA System,” Int. J. Communication Systems, vol. 35, no. 15, pp. xx-xx, Oct. 2022 (doi.org/10.1002/dac.5287).
  12. Rajanish Kumar Singh and M. Thottappan, “Design and Simulation Studies of a Continuously Tunable Sub-THz Gyrotron Using Magnetic and Thermal Tuning Schemes,” IEEE Transactions on Plasma Science, vol. 50, no. 9, pp. 3262-3269, Sep. 2022 (10.1109/TPS.2022.3196228).
  13. M. Hemanta Kumar, Sanjeev Sharma, M. Thottappan, and Kuntal Deka, “Reconfigurable intelligent surface assisted downlink INOMA system,” Trans. Emerging Tel. Tech. vol. 33, no. 9, pp. xx-xx, Sep. 2022 (doi.org/10.1002/ett.4537).
  14. Vangalla Veerababu, M. Thottappan and Smrity Dwivedi, "Design and PIC Simulation of Ka-Band Periodically Loaded High Gain Gyro-Twystron," IEEE Transactions on Electron Devices, vol. 69, no. 8, pp. 4553-4562, Aug. 2022 (10.1109/TED.2022.3182297).
  15. Vangalla Veerababu, M. Thottappan and Smrity Dwivedi, "Design and Simulation Investigations of a High Gain Millimeter Wave Gyro-Twystron Amplifier," Journal of Electromagnetic Waves and Applications, Taylor & Francis Online, vol. 36, no. 18, pp. 2740-2755, July 2022 (10.1080/09205071.2022.2106448).
  16. Shyam Gopal Yadav, Akash and M. Thottappan, “Design and Simulation Investigations of Stagger Tuned W-Band Gyro-Twystron,” IEEE Transactions on Electron Devices, vol. 69, no. 2, pp. 777-784, Feb. 2022 (10.1109/TED.2021.3137366)
  17. V. Venkata Reddy, Mumtaz Ali Ansari and M.Thottappan, "Modeling of RF Pulse Shortening Causes and Their Effects on an Overmoded RBWO under Low Guiding Magnetic Field,” IEEE Transactions on Electron Devices, vol. 69, no. 1, pp. 333-339, Jan. 2022 (10.1109/TED.2021.3130860)
  18. Akash and M.Thottappan, "Design and Simulation Investigations of W-Band Second Harmonic Periodically Dielectric Loaded Gyro-TWT," IETE Technical Review, vol. 38, no. 5, pp. 1180-1188, Oct. 2021 (10.1080/02564602.2021.1984322).
  19. M. Hemanta Kumar, Sanjeev Sharma, M.Thottappan, and Kuntal Deka, " Precoded Spatial Modulation-Aided Cooperative NOMA," IEEE Communications Letters, vol. 25, no. 6, pp. 2053-2057, June 2021 (10.1109/LCOMM.2021.3066602).
  20. V. Venkata Reddy, Mumtaz Ali Ansari and M.Thottappan, "Simulation Investigations of High Power Overmoded Relativistic Backward Wave Oscillator with Trapezoidal Resonant Reflector," Defence Science Journal, vol. 71, no. 3, pp. 346-350, May 2021 (10.14429/dsj.71.16745).
  21. Rajanish Kumar Singh and M.Thottappan, “ Design and Investigations of Millimeter-Wave Gyrotron with Multi-Section Slightly Tapered RF Cavity for DNP/NMR Spectrometer Application,” IEEE Transactions on Plasma Science, vol. 49, no. 3, pp. 1097-1104, March 2021 (10.1109/TPS.2021.3060802).
  22. Akash and M.Thottappan, “ Design and Efficiency Enhancement Studies of Periodically Dielectric Loaded W-Band Gyro-TWT Amplifier,” IEEE Transactions on Electron Devices, vol. 67, no. 7, pp. 2925-2932, July 2020 (10.1109/TED.2020.2996191).
  23. Akash and M.Thottappan, “Design, Beam-Wave Interaction and Efficiency Enhancement Studies of Millimeter Wave Gyro-TWT with a Three-Stage Depressed Collector,” IEEE Transactions on Plasma Science, vol. 48, no. 6, pp. 1930-1935, June 2020 (10.1109/TPS.2020.2978792).
  24. Rajanish Kumar Singh, Akash, and M.Thottappan, “Design and Simulation Investigations of High-Power Millimeter-Wave Gyrotron,” Journal of Electromagnetic Waves and Applications, Taylor & Francis Online, vol. 34, no. 6, pp. 744-758, April 2020 (10.1080/09205071.2020.1750974).
  25. Rajanish Kumar Singh and M.Thottappan, “Design and PIC Simulation Studies of Millimeter Wave Tunable Gyrotron using Metal PBG Cavity as its RF Interaction Circuit,” IEEE Transactions on Plasma Science, vol. 48, no. 4, pp. 845-851, April 2020 (10.1109/TPS.2020.2974791).
  26. Mumtaz Ali Ansari and M.Thottappan, “Design and Simulation of Dual-Band Non-Uniform Relativistic Backward Wave Oscillator using a Bragg Structure as its RF Circuit and Reflector-cum-Mode Converter,” IEEE Transactions on Electron Devices, vol. 67, no. 4, pp. 1814-1818, April  2020 (10.1109/TED.2020.2974283).
  27. Mumtaz Ali Ansari and M.Thottappan, “Studies of Pulse Shortening Phenomena and Their Effects on the Beam-Wave Interaction in an RBWO Operating at Low Magnetic Field," IEEE Transactions on Plasma Science, vol. 48, no. 2, pp. 426-432, Feb. 2020 (10.1109/TPS.2020.2966022).
  28. Akash and M. Thottappan, “Stability and Multimode Simulation Studies of W-band Uniformly Dielectric Loaded Gyrotron Travelling Wave Tube Amplifier,” IEEE Transactions on Electron Devices, vol. 66, no. 12, pp. 5305-5312, Dec. 2019 (10.1109/TED.2019.2944487).
  29. Rajanish Kumar Singh and M. Thottappan, “Simulation Investigations and Optimization of a Millimeter Wave Gyrotron for its Tunability using Magnetic and Thermal Tuning Schemes,” IEEE Transactions on Electron Devices, vol. 66, no. 8, pp. 3580-3586, Aug. 2019 (10.1109/TED.2019.2921680).
  30. Mumtaz Ali Ansari and M.Thottappan, “Design and Performance Analyses of High Efficiency X-band Relativistic Backward Wave Oscillator using an Improved Resonant Reflector under Low Guiding Magnetic Field," IEEE Transactions on Plasma Science, vol. 47, no. 4, pp. 1754-1761, Apr. 2019 (10.1109/TPS.2019.2904041).
  31. Anshu Sharan Singh, and M. Thottappan, “ RF Coupling and Beam-Wave Interaction Study in a Periodically Loaded X-band 25 MW Gyro-twystron,” IEEE Transactions on Electron Devices, vol. 65, no. 11, pp. 5089-5096, Nov. 2018 (10.1109/TED.2018.2871608).
  32. Anshu Sharan Singh, and M. Thottappan, “ Stability Study in Dielectric Ring Loaded Periodic Interaction Structure for a Mega-Watt Class Gyro-twystron,” IEEE Transactions on Electron Devices, vol. 65, no. 10, pp. 4585-4591, Oct. 2018 (10.1109/TED.2018.2860243).
  33. Mumtaz Ali Ansari and M. Thottappan, “Analysis, Design, and 3D-Simulation of a High Efficiency Overmoded Non-uniform Relativistic Backward Wave Oscillator,” IEEE Transactions on Electron Devices, vol. 65, no. 3, pp. 1158-1163, March 2018 (10.1109/TED.2018.2795099).
  34. Amit Arora, M. Thottappan and P. K. Jain, “Particle-In-Cell Simulation of a Millimeter Wave Gyrotron Travelling Wave Amplifier,” International Journal of Microwave and Optical Technology, vol.12, no.1, pp.37-44, Jan. 2017.
  35. Amit Arora, M. Thottappan and P. K. Jain, “Design and Stability Studies of Second Harmonic Gyro-TWT Amplifier Using Wedge-Shaped Lossy Ceramic Rods Loaded Mode Selective RF Interaction Circuit,” IEEE Transactions on Plasma Science, vol. 44, no. 10, pp.` 2340 - 2347, Oct. 2016 (10.1109/TPS.2016.2600628).
  36. Anshu Sharan Singh, S. Yuvaraj, and M. Thottappan, “Analytical and PIC Simulation Studies of a Mega-Watt Class Gyro-Twystron Amplifier,” IEEE Transactions on Electron Devices, vol. 63, no. 10, pp. 4104-4112, Oct. 2016 (10.1109/TED.2016.2600486).
  37. Amit Arora, M. Thottappan and P. K. Jain, “Particle-In-Cell Simulation of Uniformly Loaded W-band Gyro-TWT to Study its Multi-Mode Beam-Wave Interaction Behavior,” International Journal of Microwave Applications, vol. 5, no. 5, pp. 41 - 47, Oct. 2016.
  38. M. Thottappan, Pardeep Singh and P.K.Jain, “Gyro-TWT Using a Metal PBG Waveguide as its RF Circuit — Part II: PIC simulation and Parametric Analysis”, IEEE Transactions on Electron Devices, vol. 63, no. 5, pp. 2125-2131, May 2016 (10.1109/TED.2016.2543843).
  39. M. Thottappan, Sukwinder Singh and P.K.Jain, “Gyro-TWT Using a Metal PBG Waveguide as its RF Circuit — Part I: Analysis and Design”, IEEE Transactions on Electron Devices, vol. 63, no. 5, pp. 2118-2124, May 2016 (10.1109/TED.2015.2493963).
  40. M. Thottappan, and P.K.Jain, “Nonlinear Investigation and 3-D Particle Simulation of Second Harmonic Gyro-TWT with a Mode Selective RF Circuit”, IEEE Transactions on Electron Devices, vol. 62, no. 5, pp. 1641-1647, May 2015 (10.1109/TED.2015.2412777).
  41. M. Thottappan, Yuvaraj S., and P.K.Jain, “3-D PIC Simulation of a Gyro-Twystron Amplifier using “MAGIC”, IEEE Transactions on Plasma Science, vol. 43, no. 1, pp. 398-404, Jan. 2015 (10.1109/TPS.2014.2376977).
  42. M. Thottappan, Surya Prakash Singh and P.K.Jain, “Analysis and PIC Simulation of Gyrotron Travelling Wave Tube Amplifier”, Journal of Microwaves, Optoelectronics and Electromagnetic Applications, vol. 12, no. 2, pp. 307-324, Dec. 2013 (10.1590/S2179-10742013000200006)
  43. M. Thottappan and P.K.Jain, “Analysis, Design and Simulation of Metal PBG Waveguide”, International Journal of Microwave and Optical Technology, vol.8, no.2, pp.61-68, March 2013.
  44. M.Thottappan and P.K.Jain, “PIC Simulation of a Gyro-TWT Amplifier to Study its Beam-Wave Interaction Behavior”, International Journal of Microwave Applications, vol.1, no.1, pp.13-19, Dec. 2012.
  1. Pratibha Verma, and M. Thottappan, "Design and PIC Simulation of Klystron Like RBWO With Four Premodulation CavitiesDesign and PIC Simulation of Klystron-like RBWO with Four Extraction Cavities at Lower Guiding Magnetic Field," IEEE Microwaves, Antennas, and Propagation Conference (MAPCON)-2024, 9-13th Dec. 2024.
  2. Sagar Bhattacharya, Somak Bhattacharyya, and M. Thottappan, "Sun Inspired Tri-Band FSS Based Absorber With High Angular Stability and Polarization Insensitivity Used for RF Energy Harvesting Applications," IEEE Microwaves, Antennas, and Propagation Conference (MAPCON)-2024, 9-13th Dec. 2024.
  3. Vishnu Kumar Mishra, Ravi Kumar, Biswajeet Mukherjee, Vinit Kumar, Praveen Ambati, Jolly Dhar, M.Thottappan, and Somak Bhattacharyya,"A Metasurface Based Dual Passband Filter With Sharp Rejection for L-Band Applications," IEEE Microwaves, Antennas, and Propagation Conference (MAPCON)-2024, 9-13th Dec. 2024.
  4. Vishal Singh and M. Thottappan, "FSS-Based Rasorber With Wideband Absorption and Tunable Transmission," IEEE Microwaves, Antennas, and Propagation Conference (MAPCON)-2024, 9-13th Dec. 2024.
  5. Pratibha Verma, and M. Thottappan, "Design and PIC Simulation of Klystron-like RBWO with Four Extraction Cavities at Lower Guiding Magnetic Field," National Conference on Emerging Trends in Vacuum Electronic Devices & Applications (VEDA)-2024, 18-20th  Nov. 2024.
  6. Pratibha Verma, V Venkatareddy, and M. Thottappan, " Design and PIC Simulation of Klystron-like RBWO with Dual Extraction Cavity," National Conference on Emerging Trends in Vacuum Electronic Devices & Applications (VEDA)-2022, 19-21st Jan. 2023.
  7. Vangalla Veerababu, Smrity Dwivedi and M. Thottappan, "Design and PIC Simulation of Periodic Dielectric Loaded (PDL) Millimeter Wave Gyro-Twystron," National Conference on Emerging Trends in Vacuum Electronic Devices & Applications (VEDA)-2022, 19-21st Jan. 2023.
  8. V Venkatareddy, Pratibha Verma and M. Thottappan, " Design and Simulation of Dual-Band RBWO with Azimuthally Splitted Slow Wave Structure," National Conference on Emerging Trends in Vacuum Electronic Devices & Applications (VEDA)-2022, 19-21st Jan. 2023.
  9. Vangalla Veerababu, Shyam Gopal Yadav, M. Thottappan and Smrity Dwivedi, "Design and PIC Simulation of Millimeter Wave Stagger Tuned Gyro-Twystron," 2022 IEEE Microwaves, Antennas, and Propagation Conference (MAPCON), 12-15th Dec. 2022. 
  10. Shyam Gopal Yadav, Vangalla Veerababu and M. Thottappan, "Design and PIC Simulation Studies of Cluster Cavity W-Band  Gyro-Twystron," 2022 IEEE Microwaves, Antennas, and Propagation Conference (MAPCON), 12-15th Dec. 2022. 
  11. Pratibha Verma, V Venkatareddy, and M. Thottappan, "Design and PIC Simulation of Klystron Like RBWO at Lower Guiding Magnetic Field," 2022 IEEE Microwaves, Antennas, and Propagation Conference (MAPCON), 12-15th Dec. 2022. 
  12. Madhavi Chandra, Sambit Gosh, M. Thottappan, and Somak Bhattacharyya, "A Transmittive-Type Metasurface for Dual-Band Linear to Circular Polarization Conversion," 022 IEEE Microwaves, Antennas, and Propagation Conference (MAPCON), 12-15th Dec. 2022. 
  13. Vangalla Veerababu, M. Thottappan and Smrity Dwivedi, "Design and PIC Simulation of a Millimeter-Wave Gyro-twystron Amplifier," IEEE Wireless, Antenna and Microwave Symposium, National Institute of Technology Rourkela, India, 5 -8th June 2022.
  14. V Venkatareddy, Pratibha Verma and M. Thottappan, " Design and PIC Simulation of Dual-band RBWO Under Low Magnetic Field Operation," IEEE Wireless, Antenna and Microwave Symposium, National Institute of Technology Rourkela, India, 5 -8th June 2022.
  15. Madhavi Chandra, Nilotpal, M. Thottappan, and Somak Bhattacharyya, “A Transmissive Type Dual Band Cross Polarization Converter Metasurface for IoT Applications,” Indian Conference on Antennas and Propagation (InCAP 2021), Jaipur, India, 13-16th Dec. 2021.
  16. Anshu Sharan Singh, and M. Thottappan, “Broadening, Tuning, and Tailoring of Pass bands in RF Window for Multi-Frequency Vacuum Electron Devices,” 2020 IEEE Microwave Theory and Techniques in Wireless Communications (MTTW), online from Riga, Lativa, 1-2nd Oct. 2020.
  17. M Hemanta Kumar, Sanjeev Sharma, and M Thottappan, “Downlink Index Modulation aided NOMA for MIMO Transmission,” 2020 IEEE 3rd 5G World Forum (5GWF), Virtual Event, 10-12th Sep. 2020.
  18. Akash and M.Thottappan, “Design Studies of Two-Stage Depressed Collector for Millimeter Wave Gyro-TWT Using “MAGIC”, 2020 IEEE International Conference on Electronics, Computing and Communication Technologies (CONECCT), Bangalore, India, 2-4th July, 2020.
  19. V Venkata Reddy, M.A.Ansari and M.Thottappan, “PIC Simulation Studies of High Power RBWO with Trapezoidal Resonant Reflector at Low Guiding Magnetic Field”, 2020 IEEE International Conference on Electronics, Computing and Communication Technologies (CONECCT), Bangalore, India, 2-4th July, 2020.
  20. Anshu Sharan Singh and M. Thottappan, ”Bunching Parameter Study of Hybrid Gyrotron Amplifier,” German Microwave Conference (GeMiC)-2020, online form Cottbus, Germany, March 9-11th, 2020.
  21. Akash and M.Thottappan, “RF Propagation Characteristics of Y-shaped Coupler for Millimeter-Wave Gyro-TWT”, URSI Regional Conference on Radio Science (RCRS)-2020, IIT(BHU), Varanasi, India, 12-14th Feb. 2020.
  22. Anshu Sharan Singh and M. Thottappan, “Design and Simulation of Wide-Band Multi-Disc RF Window for Gyrotron Travelling Wave Amplifiers,” URSI Regional Conference on Radio Science (RCRS)-2020, IIT (BHU), Varanasi, India, 12-14th Feb. 2020.
  23. Akash and M.Thottappan, “Input/Output System for Millimeter Wave Gyro-TWT,” IEEE International Microwave and RF Conference (IMaRC)-2019, IIT Bombay, Mumbai, India, 13-15th Dec. 2019.
  24. V. Venkata Reddy, Mumtaz Ali Ansari and M.Thottappan, “Simulation Studies of an Overmoded RBWO under Low Guiding Magnetic Field,” 2019 Asia-Pacific Microwave Conference (APMC), Singapore, 10-13th Dec. 2019.
  25. S. G. Yadav, A.S. Singh, and M.Thottappan, “PIC Simulation of a Periodically Dielectric Loaded Millimeter Wave Gyro-twystron Amplifier”, 2019 Asia-Pacific Microwave Conference (APMC), Singapore,10-13th  Dec. 2019.
  26. Anshu Sharan Singh, and M. Thottappan, “Design and Simulation Study of Wraparound Couplers for Gyrotron Travelling Wave Amplifiers,” 2019 IEEE Microwave Theory and Techniques in Wireless Communications (MTTW), Riga, Lativa, 1-2nd Oct. 2019.
  27. V. Venkata Reddy, Mumtaz Ali Ansari and M.Thottappan, “Design and Simulation of High Power Overmoded Relativistic Backward Wave Oscillator using Trapezoidal Resonant Reflector,” National Symposium on Vacuum Electronic Devices & Applications (VEDA)-2019, NIT, Patna, India, 21-23rd Nov. 2019.
  28. V. Veera Babu, Smrity Dwivedi and M.Thottappan, “Design and Simulation of Two Cavity Ka-band Gyro-Twystron Amplifier,” National Symposium on Vacuum Electronic Devices & Applications (VEDA)-2019, NIT, Patna, India, 21-23rd Nov. 2019.
  29. Akash and M.Thottappan, “Design and Simulation of W-band Second Harmonic Periodically Loaded Gyro-TWT Amplifier,” 20th International Vacuum Electronic Conference (IVEC) 2019, IEEE International, Busan, South Korea, 28th Apr. - 1st May 2019.
  30. Mumtaz Ali Ansari and M.Thottappan, “Design and Simulation of an X-Band RBWO using Non-uniform Bragg Structure,” 20th International Vacuum Electronic Conference (IVEC) 2019, IEEE International, Busan, South Korea, 28th Apr. - 1st May 2019.
  31. Rajanish Kumar Singh and M.Thottappan, “Mode Analysis and Design of PBG Cavity for Tunable Gyrotron”, URSI Asia Pacific Radio Science Conference (AP-RASC)-2019, New Delhi, India, 9-15th March 2019.
  32. Akash and M.Thottappan, “3D Beam-Wave Interaction Study in a Dielectric Loaded W-band Gyro-TWT using MAGIC”, IEEE MTT-S International Microwave and RF Conference (IMaRC)-2018, Kolkata, India, 28-30th, Nov. 2018.
  33. Mumtaz Ali Ansari and M.Thottappan, “Study of Improved Cavity Resonant Reflector for an X-Band Relativistic Backward Wave Oscillator”, IEEE MTT-S International Microwave and RF Conference (IMaRC)-2018, Kolkata, India, 28-30th Nov. 2018.
  34. S. G. Yadav, A.S. Singh, and M.Thottappan, “ 3D Particle-In-Cell Simulation of W-band Gyro-Twystron Amplifier”, IEEE MTT-S International Microwave and RF Conference (IMaRC)-2018, Kolkata, India, 28-30th Nov. 2018.
  35. Anshu Sharan Singh and M.Thottappan, “Analysis of Pre-bunching RF Sections for Weakly Relativistic Gyro-Twystron,” National Symposium on Vacuum Electronic Devices & Applications (VEDA)-2018, IIT, Guwahati, India, 22-24th Nov., 2018.
  36. V. Veera Babu, Anshu Sharan Singh, Smrity Dwivedi and M.Thottappan, “Design Studies of a Ka-band Gyro-Twystron,” National Symposium on Vacuum Electronic Devices & Applications (VEDA)-2018, IIT, Guwahati, India, 22-24th Nov., 2018
  37. V. Venkata Reddy, Mumtaz Ali Ansari and M.Thottappan, “Design Studies on S-Band Uniform Relativistic Backward Wave Oscillator,” National Symposium on Vacuum Electronic Devices & Applications (VEDA)-2018, IIT, Guwahati, India, 22-24th Nov., 2018.
  38. Akash and M.Thottappan, “Numerical Analysis of Resistively Loaded Waveguide for W-band Gyro-TWT,” National Symposium on Vacuum Electronic Devices & Applications (VEDA)-2018, IIT, Guwahati, India, 22-24th Nov., 2018.
  39. S. G. Yadav, A.S. Singh, and M.Thottappan, “Beam-Wave Interaction Studies of W-band Gyro-twystron,” National Symposium on Vacuum Electronic Devices & Applications (VEDA)-2018, IIT, Guwahati, India, 22-24th Nov., 2018.
  40. Mumtaz Ali Ansari and M.Thottappan, “PIC Simulation of Relativistic Backward Wave Oscillator using Bragg Structure,” National Symposium on Vacuum Electronic Devices & Applications (VEDA) - 2018, IIT, Guwahati, India, 22-24th Nov., 2018.
  41. Rajanish Kumar Singh and M.Thottappan, “Design and Simulation of CW Tunable Gyrotron using PBG Cavity as its RF Circuit,” German Microwave Conference (GeMiC)-2018, Freiburg, Germany, 12-14th March 2018.
  42. Akash and M.Thottappan, “PIC Simulation of Uniformly Loaded Gyro-TWT,” National Symposium on Vacuum Electronic Devices & Applications (VEDA), IIT, Roorkee, India, 17-19th Nov., 2017.
  43. Dhananjay Kumar, Mumtaz Ali Ansari and M.Thottappan, “PIC-Simulation of an S-Band non-uniform Relativistic Backward Wave Oscillator,” National Symposium on Vacuum Electronic Devices & Applications (VEDA), IIT, Roorkee, India, 17-19th Nov., 2017.
  44. Rajanish Kumar Singh and M.Thottappan, “Design and Cold Simulation of Metal PBGCavity for THz Gyrotron,” National Symposium on Vacuum Electronic Devices & Applications (VEDA), IIT, Roorkee, India, 17-19th Nov., 2017.
  45. Anshu Sharan Singh and M.Thottappan, “Multimode Analysis of Periodically Loaded Gyro-twystron Amplifier,” National Symposium on Vacuum Electronic Devices & Applications (VEDA), IIT, Roorkee, India, 17-19th Nov., 2017.
  46. Arjun Kumar, M. Thottappan, and   P. K. Jain, “Study of Asymmetric Mode Generation in Magnetically Insulated Line Oscillator,” National Symposium on Vacuum Electronic Devices & Applications (VEDA), IIT, Roorkee, India, 17-19th Nov., 2017.
  47. Prabhakar Tripathi, Manpuran Mahto, M. Thottappan, and P. K. Jain, “Studies of a Megawatt-Class Gridless Reltron Oscillator,” National Symposium on Vacuum Electronic Devices & Applications (VEDA), IIT, Roorkee, India, 17-19th Nov., 2017.
  48. Mumtaz Ali Ansari and M.Thottappan, “Design and Simulation of a High efficiency Relativistic Backward Wave Oscillator,” 18th International Vacuum Electronic Conference (IVEC) 2017, IEEE International, London, UK, 24-26th Apr., 2017.
  49. Rajanish Kumar Singh and M.Thottappan, “Design and Cold Simulation of a Metal PBG Cavity for Sub-millimeter Wave Gyrotron,” 18th International Vacuum Electronic Conference (IVEC) 2017, IEEE International, London, UK, 24-26th Apr., 2017.
  50. Akash and M.Thottappan, “Particel-In-Cell Simulation of W-band Gyro-TWT,” National Conference on Emerging Trends in Vacuum Electronic Devices & Applications (VEDA), IPR, Gandhinagar, India, 16-18th March, 2017.
  51. Mumtaz Ali Ansari, Dhananjay Kumar, and M.Thottappan, “Design and Simulation of an X-band Relativistic Backward Wave Oscillator,” National Conference on Emerging Trends in Vacuum Electronic Devices & Applications (VEDA), IPR, Gandhinagar, India, 16-18th March, 2017.
  52. Dhananjay Kumar, Mumtaz Ali Ansari, and M.Thottappan, “PIC Simulation of an S-band Relativistic Backward Wave Oscillator,” National Conference on Emerging Trends in Vacuum Electronic Devices & Applications (VEDA), IPR, Gandhinagar, India, 16-18th March, 2017.
  53. Rajanish Kumar Singh and M.Thottappan, “PIC Simulation Studies of a High Power Millimeter Wave Gyrotron,” National Conference on Emerging Trends in Vacuum Electronic Devices & Applications (VEDA), IPR, Gandhinagar, India, 16-18th March, 2017.
  54. Rajanish Kumar Singh and M.Thottappan, “Design and PIC Simulation Studies of a Millimeter Wave Gyrotron for DNP/NMR Applications,” National Conference on Emerging Trends in Vacuum Electronic Devices & Applications (VEDA), IPR, Gandhinagar, India, 16-18th March, 2017.
  55. Anshu Sharan Singh and M.Thottappan, “Particel-In-Cell Simulation of Ka-band Gyro-Twystron,” National Conference on Emerging Trends in Vacuum Electronic Devices & Applications (VEDA), IPR, Gandhinagar, India, 16-18th March, 2017.
  56. Anshu Sharan Singh,  Sanjay Chauhan, and M.Thottappan, “Analytical and PIC Simulation Studies of Ka-band Gyro-Twystron Amplifier,” Asia Pacific Microwave Conference (APMC) 2016, New Delhi, India, 5-9th Dec., 2016.
  57. Rajanish Kumar Singh and M.Thottappan, “PIC Simulation of a Millimeter Wave Gyrotron for DNP/NMR Applications,” International Conference on Industrial and Information Systems (ICIIS) -2016, IIT-Rookee, India, 3-4th Dec., 2016.
  58. Rajanish Kumar Singh and M.Thottappan, “Design and Simulation Studies of a Metal PBG Cavity for Millimetre Wave Gyrotrons”, 37th Progress in Electromagnetic Research Symposium (PIERS) -2016, Shanghai, China, 8-11th, Aug. 2016.
  59. Rajanish Kumar Singh and M.Thottappan, “Particle-in-Cell (PIC) Simulation of a 250 GHz Gyrotron”, 37th Progress in Electromagnetic Research Symposium (PIERS)-2016, Shanghai, China, 8-11th Aug. 2016.
  60. Anshu Sharan Singh and M.Thottappan, “Design and PIC Simulation of a Mega-Watt Class Gyro-Twystron”, 37th Progress in Electromagnetic Research Symposium (PIERS)-2016, Shanghai, China, 8-11th Aug. 2016.
  61. Anshu Sharan Singh and M.Thottappan, “Design and PIC Simulation a Stagger Tuned Gyro-twystron”, 37th Progress in Electromagnetic Research Symposium (PIERS)-2016, Shanghai, China, 8-11th Aug. 2016.
  62. M.Thottappan, and P.K.Jain, “Particle-In-Cell Simulation of gyro-TWT using a Metal PBG Circuit”, German Microwave Conference (GeMiC)-2015, Nuremberg, Germany, 16-18th March 2015, (ISBN 978-3-9812668-6-3)
  63. Amit Arora, M.Thottappan, and P.K.Jain, “Time-Dependent Nonlinear Analysis of Gyro-TWT Amplifier,” National Conference on Recent Advances in Electronics & Computer Engineering, RAECE -2015, IIT Roorkee, India,13-15th Feb. 2015.
  64. M.Thottappan, and P.K.Jain, “Cold Measurement of a Ka-Band Metal PBG Waveguide”, IEEE MTT-S International Microwave and RF Conference (IMaRc)-2014, Bangalore, India, 15-17th Dec. 2014.
  65. M.Thottappan, and P.K.Jain, “Design and Simulation of Metal PBG Waveguide Mode Launcher”, IEEE Region 10 Technical Symposium (TENSYM) 2014, Kuala Lumpur, Malaysia, April 2014.
  66. Sachin Kalraiya, Hari Shankar Singh, Manoj Kumar Meshram, and M.Thottappan,  “Microstripline-Fed Dual Band Printed Monopole Antenna for WLAN/WiMAX/HIPERLAN Applications”, IEEE Region 10 Technical Symposium (TENSYM)- 2014, Kuala Lumpur, Malaysia, April 2014.
  67. Yuvaraj S.,  M.Thottappan, and P.K.Jain, “Design and Simulation of 94 GHz Metal PBG Waveguide”, IEEE MTT-S International Microwave and RF Conference (IMaRc)- 2013, Delhi, India, 14-16th Dec. 2013.
  68. Yuvaraj S., M.Thottappan, and P.K.Jain, “Analytical Study of High Power Gyro-Twystron”, 9th International Conference on Microwaves, Antenna, Propagation & Remote Sensing, ICMARS-2013, Jodhpur, India, 11 – 14th Dec. 2013.
  69. Pushpalata Laxman Pakhale, M.Thottappan, and P.K.Jain. “PIC Simulation of Second Harmonic Ka-band Gyro–TWT”,  9th International Conference on Microwaves, Antenna, Propagation & Remote Sensing, ICMARS-2013, Jodhpur, INDIA, 11 – 14th Dec. 2013.
  70. Yuvaraj S., M.Thottappan, and P.K.Jain, “High Power Gyro-Twystron- A Review”, VEDA KOLLEG 2013 at IIT Roorkee, India, 18-20th Oct. 2013.
  71. Pushpalata Laxman Pakhale, M.Thottappan, and P.K.Jain. “PIC Simulation of Second Harmonic Gyro –TWT Amplifier”, VEDA KOLLEG 2013 at IIT Roorkee, India, 18-20th Oct. 2013.
  72. M.Thottappan,  Sukwinder Singh, and P.K. Jain, “Second Harmonic High Power Gyro-TWT Amplifier”, VEDA KOLLEG 2013 at IIT Roorkee, India, 18-20th Oct. 2013.
  73. M.Thottappan, and P.K.Jain, “Particle-in-Cell  Simulation of 35 GHz Gyro-TWT Amplifier”, 8th  International Conference on Microwaves, Antenna, Propagation & Remote Sensing, ICMARS-2012, Jodhpur, India, pp. 876-880, Dec. 11 – 15th, 2012.
  74. Sukwinder Singh, M.Thottappan, and  P.K.Jain “Numerical Simulations of Gyro-TWT Amplifier Using Metal PBG Waveguide”, 8th  International Conference on Microwaves, Antenna, Propagation & Remote Sensing, ICMARS-2012, Jodhpur, India, pp. 863-867, 11 – 15th Dec. 2012.
  75. Pardeep Singh, M.Thottappan, and P.K.Jain, “Design and Simulation Metal Photonic Band Gap Waveguide for Ka-Band Gyro-TWT amplifier”, 8th  International Conference on Microwaves, Antenna, Propagation & Remote Sensing, ICMARS-2012, Jodhpur, India, pp. 860-862, 11 – 15th Dec. 2012.
  76. M.Thottappan, and P.K.Jain, “Design and Simulation Metal Photonic Band Gap Waveguide for Gyro-TWT amplifier,” National Conference on Vacuum Electron Devices & its Applications (VEDA-2012), Pilani, India, 21-24th, Sep. 2012.
  77. M. Thottappan, and P. K. Jain, “Beam-wave Interaction simulation of gyro-TWT amplifier,” National Conference on Recent Trends on Microwave Techniques and Applications (Microwave-2012), Jaipur, India, 30th  July - 1st  Aug. 2012.
  78. Surya Prakash Singh, Gaurav Singh Baghel, M. Thottappan, and P. K. Jain, “Modeling and Simulation of a 250 GHz Metal PBG Waveguide for Gyrotron Amplifier”, IEEE International Conference on Computing, Electronics and Electrical Technologies [ICCEET], pp. 828-831, March 2012.
  79. Lalit Gathre, M. Thottappan, and P. K. Jain, “Analysis of PBG Structures using FDTD Algorithm”, IEEE International Conference on Computing, Electronics and Electrical Technologies [ICCEET], pp. 825-827, March 2012.
  80. M.Thottappan, and P.K.Jain, “Analysis of two dimensional metal electromagnetic band gap (EBG) structure using finite difference time domain method”, IVEC 2011, IEEE International, pp.311 – 312, Feb. 2011.
  81. M.Thottappan,  Pathak, A.K.,  and P.K.Jain, “Study of Metal Photonic Band Gap structures for Gyrotron”, National Symposium on Vacuum Technology and its Applications to Electronic Devices & Systems, 11-13th Nov. 2009, CEERI, CSIR, Pilani,  India.
  82. M.Thottappan,  Pathak, A.K., and P.K.Jain, “Simulation of Linear waveguides in Photonic Crystal Slab”, Symposium on Vacuum Electronic Devices and Applications, VEDA 2009, 8-10th Jan. 2009, BHU, Varanasi.
  83. Kalivaraprasad Reddy, D., M.Thottappan,  and P.K.Jain, “Analysis and simulation of folded waveguide slow wave guide structures for millimeter wave TWTs”, Symposium on Vacuum Electronic Devices and Applications, VEDA 2009, 8-10th Jan. 2009, BHU, Varanasi.
  84. Pathak, A.K.,  M.Thottappan, and  P.K.Jain, “Study of Metal Photonic Band Gap structures for millimeter wave Gyro-TWTs”, 7th Indian conference on Microwave, Antenna, Propagation and Remote sensing, 9-11th Dec. 2008, InCMARS, Jodhpur, India.

Ph.D. Thesis Guidance:

  1. Mr. Amit Arora - Multimode Time-Dependent Analysis and Simulation Studies of the Gyro-TWT Amplifier (Awarded in June 2017)
  2. Mr. Anshu Sharan Singh -  Stability Analysis, Design, and Simulation of X-band Gyro-Twystron Amplifiers (Awarded in Nov. 2020)
  3. Mr. Sivavenkateswara Rao V - Design Studies of Fixed and Tunable Frequencies Gyrotron Oscillators (Awarded in Nov. 2020)
  4. Mr. Rajanish Kumar Singh -  Design and Simulation Studies of Low Power Tuneable Gyrotrons for DNP/NMR Spectroscopy Applications (Awarded in April 2021)
  5. Mr. Mumtaz Ali Ansari - Design and Simulation Investigations of Relativistic Backward Wave Oscillators (Awarded in June 2021)
  6. Mr. Akash - Design and Simulation Investigations of Millimeter-Wave Gyrotron Travelling Wave Tube Amplifiers (Awarded in July 2021)
  7. Mr. V. Venkata Reddy- Design and Simulation Investigations of Single/Dual Frequency Relativistic Backward Wave Oscillators (Awarded in Oct. 2022)
  8. Mr. M. Hemanta Kumar - Reconfigurable Intelligent Surface Assisted NOMA for Next-Generation Wireless Communications (Awarded in April 2023)
  9. Mr. Vangalla Veerababu -Design and Performance Improvement Studies of Millimeter Wave Gyro-Twystron Amplifiers (Awarded in April 2023)
  10. Mr. Shyam Gopal Yadav -Design and Simulation Investigations of W-Band Gyro-Twystron Amplifiers (Awarded in April 2023)
  11. Mr. Gundu Venkatesh - Design and Development of Frequency Selective Surfaces for Microwave Filtering Applications (Submitted in January 2024)
  12. Ms. Pratibha Verma (Registered in Dec. 2020)
  13. Mr.  Vishal Singh (Registered in Dec. 2022)
  14. Mr. Sagar Bhattacharaya (Registered in July 2023)
  15. Mr. M. Vijay Kumar (Registered in July 2024)

EM Simulation Tools:

(i) MAGIC Pro-3D Suite
(ii) E-Gun Particle Optics Program
(iii) CST Studio Suite-2021
(iv) High-Frequency Structure Simulator

(v) Workstations with 512 GB RAM & GPU (GV100) supporting high speed computation for Millimeter Wave & THz Devices

  1. Member, Department  Purchase Committee, Electronics Engineering, IIT (BHU), from 01.04.2021 to 31.03.2022.
  2. Member, Department  Faculty Affairs Committee, Electronics Engineering, IIT (BHU), from 01.01.2021 to 31.12.2022.
  3. Convener, DPGC, Electronics Engineering, IIT (BHU), from 01.09.2020 to 31.08.2021.
  4. Convener, DPGC, Electronics Engineering, IIT (BHU), from 01.09.2016 to 31.08.2018.
  5. Coordinator, UG/ PG Examinations, Electronics Engineering, IIT (BHU), from Mar. 2011 to Mar. 2015.
  6. Warden, S.C. De Hostel (Aug. 2009 to July 2010) & Vishwakarma Hostel, IIT (BHU), from July 2010 to Aug. 2013.
  • UK Commonwealth Professional Fellow-2016
  • Senior Member, IEEE, USA
  • Associate Member, IETE, India
  • Life Fellow, VEDA Society, India
  • Outstanding Scientist Award 2016 - Venus International Research Foundation, Chennai, India.

Looking for highly motivated graduates to work in the field of RF & Microwaves including Antennas for 5G & 6G related applications, Frequency Selective Surfaces, Sources and Amplifiers for Defence Applications. Candidates can apply through IIT(BHU) PG admission portal for availing of Institute Assistantship, through QIP schemes, through sponsorship those are working in National Laboratories and Academic Institutes and having their own fellowship from any other recognized funding angelicas.

https://iitbhu.ac.in/positions

1. Dr. Navin Kumar Singh - Research Associate

2. Ms. Pratibha Verrma - Research Associate

3. Mr. Deepak Gupta- Senior Research Fellow

4. Mr. Akula Niranjan -Junior Research Fellow

5. Ms. Sneha V. - Junior Research Fellow

6. Mr. Vishwajeet Rai- Project Assistant