Kyushu University Academic Staff Educational and Research Activities Database
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Ramesh Kumar Pokharel Last modified date:2017.05.26



Graduate School
Undergraduate School
電子情報基礎(Fundamentals of Electronics and Information Engineering)
Other Organization
Administration Post
Director of the Center for Egypt-Japan Coordination in Science and Technology
Other


E-Mail
Homepage
http://visionaries.isee.kyushu-u.ac.jp/e/index.html
https://sites.google.com/a/visionaries.isee.kyushu-u.ac.jp/rfic_microwave/ .
Fax
092-802-6913
Academic Degree
Dr. Eng.
Field of Specialization
Development of system LSI, development of high performance communication devices, Signal Integrety issues
Outline Activities
Wireless communications services have grown significantly worldwide, and explosively in some countries. Consumer demand for wireless communications has soared up in recent years. 3G technologies bring the wireless internet revolution to cell pones. Business and consumer demand for new, advanced wireless services-including 3G and Local Area Networks (LANS), such as those using Wi-Fi (wireless fidelity)-is considered by many to be an engine for future growth in Japan and a base for global economies. The standardization of broadband services has already been begun. In such global scenario, the goal of the 21st Century COE Project of Kyushu University is to lay stones for the foundation to establish a new social infrastructure system so that to we can compete the future growth of technology advancement, and become capable to meet the consumer demand in Japan and abroad. Most of the wireless communication system consists of fundamental block of RF-components, analog circuits, digital processing units and so on. RF blocks, for example of wireless LAN or cell phones, is composed of low noise amplifier (LNA), power amplifier (PA), up- and down-converter mixers, voltage-controlled oscillator (VCO) with phase-locked loop, filters, voltage gain controller (VGA), analog to digital converter and so on. Even inside a RF-block, the assembly of LNA, mixers and VCO, and the matching circuits between them for high power transfer is called a down converter. The main purpose of my research is to design, and to test a high-performance down-converter in terms of size, power consumption, noise and gain. My research also focus on the compact and highly efficient wireless power transfer systems for future application on CMOS transciever.
Research
Research Interests
  • Development of compact and highly efficient wireless power transfer system
    keyword : WPT system, efficiency, compact
    2014.05~2020.05.
  • CMOS Front-End for TV White space applications.
    keyword : TV White space, CMOS front end
    2012.04~2016.03.
  • Low power CMOS system of sensor network applications
    keyword : low power, sensor network, CMOS circuits
    2013.04~2015.03.
  • Ultra-low power CMOS transmitter
    keyword : CMOS, Ultra low power
    2012.04~2013.03.
  • Development of low power Digital to Analog converter
    keyword : low power, fibonacci series, DAC
    2008.04~2010.03Development of very low power DAC using pseudo Fibonacci series..
  • Development of ADPLL in 0.18 um CMOS process
    keyword : PLL(phase locked loop), ADPLL(all-digital phase-locked loop),DCO (digitally-controlled oscillator), WLAN
    2007.04~2010.03Recently, all-digital phase locked loops (ADPLL) has attracted much attention to realize a fully digitalized wireless reciever because they are are capable of generating gigahertz frquencies with low phase noise and low jitter in compact size.However, trade-off between the phase noise, settling time and the system stability are always existed while designing a ADPLL or a conventional charge pump type, PLLs. To overcome these problem, research on much attracted ADPLL and its fabrication on the cheapest process has begun from this year. It is expected that this research would be completed within two years span..
Academic Activities
Books
1. Ramesh Kumar Pokharel, Adel Barakat, Innovative Techniques for 60 GHz On-Chip Antennas on CMOS
Substrate
, (In press), 2017.03.
2. Ramesh K. Pokahrel, H. Kanaya, and K. Yoshida, Microwave and Millimeterwave Technologies, Viena, Austria, ISBN 978-953-7619-X-X, IN-TECH Publications, 2010.1 (In Press)., 2010.01, [URL].
Papers
1. , [URL].
2. Mohamed Ali, Ahmed Allam, Adel B. Abdel-Rahman, Ramesh Kumar Pokharel, Design of Dual Band Microstrip Antenna with Enhanced Gain for Energy Harvesting Applications, IEEE Antennas and Wireless Propagation Letters, 2017.01, [URL].
3. Hamed Mosalam, Ahmed Allam, Hongting Jia, Adel Abdelrahman, Ramesh Kumar Pokharel, A 12 to 24 GHz High Efficiency Fully Integrated 0.18 μm CMOS Power
Amplifier, The Institute of Electronics, Information and Communication Engineers, 13, 14, 0160551, 2016.10.
4. Hekal Sherif, Adel Barakat, Ahmed Allam, Adel B. Abdel-Rahman, Hongting Jia, Ramesh Kumar Pokharel, A Novel Technique for Compact Size Wireless Power Transfer
Applications Using Defected Ground Structures, IEEE Transactions on Microwave Theory and Techniques., 65, 2, 2017.02, [URL].
5. Sherif Hekel, Adel Barakat, Ahmed Allam, Adel B. Adel-Rahman, Hongting Jia, Ramesh Kumar Pokharel, Compact Wireless Power Transfer System Using Defected Ground Bandstop Filters, IEEE Microwave and Wireless Components Letters, 99, 10, 2016.10.
6. Nessim Mahmoud, Adel Barakat, Adel B. Abdel-Rahman, Ahmed Allam, Ramesh Kumar Pokharel, Compact Size On-Chip 60 GHz H-Shaped Resonator BPF, IEEE Microwave and Wireless Components Letters, 26, 9, 2016.09.
7. Adel Barakat, Ahmed Allam, Ramesh Kumar Pokharel, 60 GHz CMOS Circular Patch AoC on Modified Asymmetric AMC, Microwave Journal, 2016.10.
8. Adel Barakat, Ramesh Kumar Pokharel, 60 GHz on-chip mixed coupled BPF with H-shaped defected ground structures, Electronics Letters, 2016.03, [URL].
9. Ramesh Kumar Pokharel, Performance Analysis of Multicode OCDM Networks Supporting Elastic Transmission With QoS Differentiation, IEEE TRANSACTIONS ON COMMUNICATIONS, 64, 2, 741-752, 2016.02, [URL].
10. Hany A. Atallah, Adel B. Abdel-Rahman, Kuniaki Yoshitomi, Ramesh Kumar Pokharel, Compact frequency reconfigurable filtennas using varactor loaded T-shaped and H-shaped resonators for cognitive radio applications, IET Microwaves Antennas & Propagation, 4, 4, 2016.03, [URL].
11. ADEL TAWFIK MOHAMED MOHAMED BARAKAT, Hala Elsadek, Adel Abdelrahma, POKHAREL RAMESH KUMAR, Takana Kaho, Improved Gain 60 GHz CMOS Antenna with N-well Grid, IEICE Electronics Express (In press), 2016.03, [URL].
12. Sho Asano, ANAND AWINASH, Ramesh Kumar Pokharel, Hideki Hirano, Shuji Tanaka, Monolithic Integration of BST Thin Film Varactors and Au Electroplated Thick Film Inductors above IC, 電気学会論文誌E(センサ・マイクロマシン部門誌) , 138, 8, 2015.08, [URL].
13. Ahmed E. Farghal, Hossam M. H. Shalaby, Kazutoshi Kato, Ramesh Kumar Pokharel, Optical Code-Division Multiplexing (OCDM) Networks Adopting Code-Shift Keying/Overlapping PPM Signaling: Proposal and Performance Analysis, IEEE Transactions on Communications , 63, 10, 2015.10.
14. Adel Barakat, Ramesh Kumar Pokharel, Miniaturized low loss 60 GHz CMOS mixed coupled BPF with patterned ground shield, Microwave and Optical Technology Letters, 58, 3, 2016.01.
15. Lechang Liu, POKHAREL RAMESH KUMAR, Compact Modeling of Phase-Locked Loop Frequency Synthesizer for Transient Phase Noise and Jitter Simulation, IEEE TRANSACTIONS ON COMPUTER-AIDED DESIGN OF INTEGRATED CIRCUITS AND SYSTEMS, 35, 1, 2016.01, [URL].
16. Adel Barakat, A. B. Adel, Ahmed Allam, POKHAREL RAMESH KUMAR, 60 GHz CMOS Circular Patch AoC Modified Asymmetric AMC, Microwave Journals, 2015.12.
17. POKHAREL RAMESH KUMAR, G. Zhang, S. A. Enche Ab Rahim, Design of High Performance of Oscillator using Film Bulk Acoustic Resonator, 2014 Korea-Japan Microwave Workship, 2014.12.
18. W. Yamamoto, D. Kanemoto, POKHAREL RAMESH KUMAR, 金谷 晴一, 吉田 啓二, A Low Power 2.4GHz LNA Operated in Subthreshold Region, Future Information Engineering Volume I, WIT Transactions on Communications and Information Technologie, 2014.05.
19. POKHAREL RAMESH KUMAR, 金谷 晴一, A. Barakat, Back radiation reduction of 60 GHz CMOS slot Antenna-on-Chip (AoC) using Artificial Dielectric Layer (ADL) for Area Reuse, Proc. 2014 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio ScienceMeeting, 2014.07.
20. POKHAREL RAMESH KUMAR, 金谷 晴一, A. Barakat, Small Size 60 GHz CMOS Antenna-on-Chip, Proc. 44th European Microwave Conference, 2014.10.
21. Lechang Liu, POKHAREL RAMESH KUMAR, Post-Layout Simulation Time Reduction for Phase-Locked Loop Frequency Synthesizer Using System Identification Techniques, IEEE TRANSACTIONS ON COMPUTER-AIDED DESIGN OF INTEGRATED CIRCUITS AND SYSTEMS, 33, 11, 2014.11, [URL].
22. JIA HONGTING, POKHAREL RAMESH KUMAR, 金谷 晴一, Strong resonant coupling for short-range wireless power transfer using defected ground structures, Proc. 3rd International Japan-Egypt Conference on Electronics, Communications and Computers, 2015.03.
23. Guoqiang Zhang, 金谷 晴一, 吉田 啓二, Tanaka Shuji, POKHAREL RAMESH KUMAR, A low phase noise FBAR based multiband VCO design, IEICE Electronics Express, 10, 13, 2013.07.
24. 兼本 大輔, POKHAREL RAMESH KUMAR, 吉田 啓二, 金谷 晴一, Keigo Oshiro, A 10-bit 50MS/s 350 μW Small Die Area Capacitive Digital-to-Analog Converter for Bluetooth Applications, IEEJ Transactions on Electronics, Information and Systems,Vol.134 No.2 pp.328.329,2014.02., 134, 2, 2014.02.
25. ANAND AWINASH, Nischal Koirala, POKHAREL RAMESH KUMAR, 金谷 晴一, 吉田 啓二, Analytical method to determine optimal out-of-band gain in multi-bit delta-sigma modulator, IEICE Electronics Express, vol. 9, no. 20, 2012.10.
26. Rohana Sapawi, POKHAREL RAMESH KUMAR, Dayang Azra Awang Mat, 金谷 晴一, 吉田 啓二, A 0.9-3.5 GHz high linearity, good efficiency CMOS broadband power amplifier using stagger tuning technique, Microwave and Optical Technology Letters, Vol. 54, Issue: 12, 2012.12.
27. 金谷 晴一, S. Tsukamoto, T. Hirabaru, POKHAREL RAMESH KUMAR, 兼本 大輔, 吉田 啓二, Energy Harvesting Circuit on a One-Sided Directional Flexible Antenna, IEEE Microwave and Wireless Components Letters, 23, 3, 2013.03.
28. POKHAREL RAMESH KUMAR, Prapto Nugroho, ANAND AWINASH, Abhishek Tomar, 金谷 晴一, 吉田 啓二, Low Phase Noise 14-Bit Digitally Controlled CMOS Quadrature Ring Oscillator, IEICE Trans. on Electronics, Vol E-96, No. 2, 2013.02.
29. R. K. Pokharel, K. Uchida, A. Tomar, H. Kanaya, and K. Yoshida, Low phase noise, 18 kHz frequency tuning step, 5 GHz, 15 bit digitally controlled oscillator in 0.18 um CMOS technology, IEICE Trans. on Electronics, Vol. E93-C, no. 7, pp. xx-xxx, July 2010. (In press), 2010.07.
30. R. K. Pokharel, K. Wada, O. Hashimoto and T. Takahashi, A method for LTCC resonators to improve spurious responses on reduced-size microstrip structure, IEICE Trans. on Electronics, Vol. E87-C, no. 9, pp. 1517-1523, Sept. 2004., 2004.09.
31. S. A. Z. Murad, R. K. Pokharel, H. Kanaya, K. Yoshida, and O. Nizhnik, A 2.4 GHz 0.18µm CMOS Class E Single-Ended Switching Power Amplifier with Self Biased Cascode, Int. Journal of Electronic and Communications (AEU), (Elsevier publication), 2009.06.
32. A. I. A. Galal, R. K. Pokharel, H. Kanaya, and K. Yoshida, Linearization Technique using Bipolar Transistor at 5GHz Low Noise Amplifier, Int. Journal of Electronic and Communications (AEU), (Elsevier publication), 2009.07.
33. O. Nizhnik, R. K. Pokharel, H. Kanaya, and K. Yoshida, Low noise wide tuning range quadrature ring oscillator for multi-standard transceiver, IEEE Microwave and Wireless Components Letters, vol. 19, no. 7, pp. 470-472, July 2009. , 2009.07.
34. R. K. Pokharel, H. Kanaya, and K. Yoshida, Design and evaluation of -117dBc/Hz phase noise voltage-controlled oscillator using on-chip CPW resonator for 5 GHz-band WLAN, Microwave and Optical Technology Letters. , 52, 3, pp. 763-766, 2010.03.
35. Ramesh K. Pokharel, H. Kanaya and K. Yoshida, Design of 5GHz-band power amplifier with on-chip matching circuits using CPW impedance (K) inverters, Trans. of IEICE, vol. E91-C, no. 11, pp. 1824-1827, November, 2008. , 2008.11.
36. Haruichi KANAYA, Ramesh K. POKHAREL, Fuminori KOGA, Keiji YOSHIDA , Design and Verification of On-Chip Impedance-Matching Circuit Using Transmission-Line Theory for 2.4 GHz-Band Wireless Receiver Front-End, IEICE Trans. On Electronics., Vol.E89-C No.12 pp.1888-1895,December 2006., 2006.12.
37. Haruichi Kanaya, Ramesh K. Pokharel, Sangtae Kim, Akihiro Imada, and Keiji Yoshida, Design of Power Amplifier with On-Chip Matching Circuits using CPW Line Impedance
(K) Inverters, 11th WSEAS CSCC, Crete island, Greece, July 2007., paper number: 561-265, 2007.07, [URL].
38. R. K. Pokharel, K. Wada, O. Hashimoto, and T. Takahashi, A method for LTCC resonators to improve spurious responses on reduced-size microstrip structure, Trans. of IEICE, Vol. E87-C, pp. 1517-1523., 2004.09.
39. R. K. Pokharel, K. Wada, O. Hashimoto, and T. Takahashi, Improvement of spurious responses with attenuation poles in stopband by microstrip resonator, IEE Electronics Letters, vol. 40, no. 8, pp. 481-482., 2004.04, [URL].
40. R. K. Pokharel, O. Hashimoto, and M. Toyota, Analysis of EM environment for DSRC system on express highway with wave absorbers on sidewalls and pavement, IEICE Trans. Electron.,, Vol. 89-C, no. 1, pp 61-68., 2006.01, [URL].
41. R. K. Pokharel, K. Wada, O. Hashimoto, and T. Takahashi, Fundamental characteristics of microstrip resonators loaded with dielectric rods for suppression of spurious responses, IEE Proc. Microwaves, Antennas, & Propagation, vol. 153, issue 4, pp. 341-346., 2006.08, [URL].
42. Ramesh K. Pokharel, K. Wada and O. Hashimoto, Improvement of spurious responses of coupled-line BPFs using interdigital-type resonators, Microwave and optical Technology Letters, vol. 44, no. 2, pp. 126-130, Jan. 2005., 2005.01.
43. Ramesh K. Pokharel, K. Wada and O. Hashimoto, Out-of-band improvement by BPFs with multiple attenuation poles using a condition of variable coupling length of a parallel partially coupled-line section, Microwave and optical Technology Letters, vol. 47, no. 1, pp.4-9, October 2005, 2005.09.
44. Ramesh K. Pokharel, M. Toyota and O.Hashimoto, Analysis of EM wave absorbers for improvement of DSRC EM environment on express highway, IEEE Trans. on Microwave Theory and Techniques, vol. 53, no. 9, pp. 2726-2731, Sept. 2005.
Presentations
1. Adel Barakat, Sherif Hekal, Ramesh Kumar Pokharel, Simple design approach for asymmetric resonant inductive coupled WPT systems using J-inverters, 2016 Asia Pacific Microwave Conference, 2016.12.07, [URL].
2. ADEL Barakat, N Mahmoud, POKHAREL RAMESH KUMAR, Low insertion loss 60 GHz CMOS H-shaped resonator BPF, 2017 IEEE Radio and Wireless Symposium (RWS), 2017.01.17, [URL].
3. Nessim Mahmoud, Adel B Abdel-Rahman, Adel Barakat, Ramesh Kumar Pokharel, Performance enhancement of 0.18 um CMOS on chip bandpass filters using H-shaped parasitic element, 2015 27th International Conference on Microelectronics (ICM), 2015.12.21, [URL].
4. Ramesh Kumar Pokharel, B. Amalina, Comparative Design of Extremely Low Phase Noise Oscillator in Class-B and Class-C by Integrating Film Bulk
Acoustic Resonator (FBAR) on CMOS Wafer for Low Power Applications
, 2015 IEEE MTT-S International Microwave and RF Conference (IMaRC), 2015.12.12.
5. M. Hanif, ADEL TAWFIK MOHAMED MOHAMED BARAKAT, POKHAREL RAMESH KUMAR, A gain enhanced 60 GHz CMOS antenna-on-chip using off-chip Mu near zero metamaterial lens, , 2015 IEEE 4th Asia-Pacific Conference on Antennas and Propagation (APCAP), 2015.07.02.
6. Khalil Yousef, A. B. Abdel-Rahman, Ramesh Kumar Pokharel, Hongting Jia, An eight-phase CMOS injection locked ring oscillator with low phase noise, 2014 IEEE International Conference on Ultra-WideBand (ICUWB), 2014.09.02, [URL].
7. H. Hekel, A. B. Abdel-Rahman, M. Hanif, Ramesh Kumar Pokharel, Strong resonant coupling for short-range wireless power transfer applications using defected ground structures, 2015 IEEE Wireless Power Transfer Conference (WPTC), 2015.05.14, [URL].
8. Adel Barakat, A. B. Abdel-Rahman, M. Hanif, Ramesh Kumar Pokharel, Miniaturized 60 GHz triangular CMOS Antenna-on-Chip using asymmetric artificial magnetic conductor, 2015 IEEE 15th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF), 2015.01.18, [URL].
9. Ibrahim Abdalla, M. Ragab, Ramesh Kumar Pokharel, Hongting Jia, A DC-2.5GHz voltage variable attenuator in 0.18-μm CMOS technology, 2014 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS), 2014.11.18, [URL].
10. Hamed Mosalam, M. Ragab, Ramesh Kumar Pokharel, Hongting Jia, A 5–9 GHz CMOS Ultra-wideband power amplifier design using load-pull, 2013 IEEE 20th International Conference on Electronics, Circuits, and Systems (ICECS), 2013.08.10, [URL].
11. Hamed Mosalam, A. B. Adel, Ramesh Kumar Pokharel, Hongting Jia, 5.0 to 10.6 GHz 0.18 µm CMOS power amplifier with excellent group delay for UWB applications, 2015 IEEE MTT-S International Microwave Symposium (IMS), 2015.05.21, [URL].
12. Adel Barakat, Ramesh Kumar Pokharel, Haruichi Kanaya, Small size 60 GHz CMOS Antenna-on-Chip: Gain and efficiency enhancement using asymmetric Artificial Magnetic Conductor, 2014 44th European Microwave Conference (EuMC), 2014.10.06, [URL].
13. Adel Barakat, POKHAREL RAMESH KUMAR, 吉田 啓二, Ahmed Allam, Compact size high gain AoC using rectangular AMC in CMOS for 60 GHz millimeter wave applications, 2013 IEEE MTT-S International Microwave Symposium, 2013.06, [URL].
14. Khalil Ismail Khalil Yousef, POKHAREL RAMESH KUMAR, JIA HONGTING, 金谷 晴一, 吉田 啓二, Ahmed Allam, CMOS Ultra-Wideband Low Noise Amplifier (UWB-LNA) Using Symmetric 3D RF Integrated Inductor, IEEE International Conference on Ultra-Wideband , 2013.09.16, [URL].
15. POKHAREL RAMESH KUMAR, Daisuke Kanemoto, 金谷 晴一, 吉田 啓二, Design Technique for a High-speed SAR ADC Using Non-binary Search Algorithm and Redundancy, 2013 Asia-Pacific Microwave Conference Proceedings, 2013.11.06, [URL].
16. Tomoya Ijiguchi,, Daisuke Kanemoto, POKHAREL RAMESH KUMAR, Yoshida Keiji, 金谷 晴一, Development of Circularly Polarized Planar Slot Antenna for 5.8 GHz-DSRC Application, 2013 Asia-Pacific Microwave Conference Proceedings, 2013.11.07, [URL].
17. POKHAREL RAMESH KUMAR, Prapto Nugroho, ANAND AWINASH, Haruichi Kanaya, Keiji Yoshida, Digitally Controlled CMOS Quadrature Ring Oscillator with Improved FoM for
GHz Range All-Digital Phase-Locked Loop Applications
, Dig. of 2012 IEEE International Microwave Symposium (IMS), 2012.06.21, [URL].
18. Prapto Nugroho, POKHAREL RAMESH KUMAR, ANAND AWINASH, 金谷 晴一, 吉田 啓二, A Low Power 8-bit Digitally Controlled CMOS Ring Oscillator, Proc. of 2012 European Microwave Conference, 2012.10.29, [URL].
19. , [URL].
20. , [URL].
21. High Dynamic Range Mixer in 0.18 um Technology for WLAN Direct Conversion Receiver .
22. Development of a One-Sided Directional Planer Antenna with Matching Circuit.
23. Discussion on the method of the performance improvement of 5.2GHz-Band VCO.
24. Development of an Electrically Small One-Sided Directional Antenna with Matching Circuit.
25. Design of VCO for 2.4GHz Wireless Applications Using Transmission Line Resonators.
26. Study of A CPW-Fed Slot Dipole One-Sided Directional Antenna for UWB Systems.
27. Design and Performance of an Electrically Small Antenna with Matching Circuit.
28. Design of High-Linearity Amplifier for Wireless LAN Transceiver.
29. Design of 1.1 GHz Highly Linear Digitally-Controlled Ring Oscillator with Wide Tuning Range.
30. Design of Power Amplifier with On-Chip Matching Circuits using CPW Line Impedance (K) Inverters.
31. Design and Measurement of RF Frontend LSI with CPW Impedance Circuit.
32. Development of high conversion gain double balanced mixer for high performance direct conversion receiver.
33. , [URL].
Membership in Academic Society
  • The Institute of Electronics, Information and Communication Engineers
  • The Institute of Electrical and Electronics Engineers
Awards
  • LETTER OF APPRECIATION
  • 感謝賞
Educational