Wong Jia Haur, "Passive Mode-Locked Lasers and applications in microwave photonics," in progress

Chen Zhao, "Novel planar helical slow-wave structures," in progress

Rajiv K Gupta, "Finite difference time domain analysis of a pair of parallel unidirectionally conducting screens", 2001.

Zhou Junqiang, "Measurement of polarization effects in optical fibers and components", 2007.

M.Tech.

Top

1. Yap Boon Hai, 'Leaky wave antennas', Nov. 2006.


2. Sng Tat Ming, 'Microwave photonic filters', April 2008.

1. Pham Quoc Hung, 'Investigations on a novel microwave transmission line using MATLAB', UROP, Nov-Dec 2002.


2. Izhari Mawardi, 'Optical technique for RF phased arrays', UROP, Aug-Dec 2004.


3. Ouk Vireak, 'Design and development of ultra wideband (UWB) passive tag for asset positioning and identification', UROP, Aug-Dec 2004.


4. Kousuban Ravi, 'Investigations on a Novel Microwave Waveguide Structure using MATLAB', URECA, August 2006 – May 2007.


5. Kousuban Ravi, 'A novel printed microwave structure', UROP, Aug-Dec 2007.


6. Utkarsh Sharma, 'Microwave applications of ferroelectric materials', UROP, Jan-April 2008.


7. Xue Jin, 'Application of Carbon Nanotube and Tap Isolator WDM in Ultrafast Fiber Ring Laser', URECA, August 2009 – May 2010.


8. Li Nanxi, 'Simulation of Mode-Locked Laser', URECA, August 2009 – May 2010.


9. Xue Jin, 'Noise Properties of Harmonic Passive Mode-Locked Fiber Lasers', URECA, August 2010 – May 2011.


10. Li Nanxi, 'Performance Simulation of Linear–Cavity Passive Mode-Locked Fiber Laser', URECA, August 2010 – May 2011.

1. Arun Nijhawan, "Reception and onward transmission of TV signals from INSAT IB", Dec. 1984.


2. T.Naveen, "PC based Q factor measurement of a microwave open resonator", April 1988.


3. Vimal Kumar, "Channel dropping filter using a microwave open resonator", May 1989.


4. M.R.Ramachandran and Pradeep Singh, "A planar Fresnel zone antenna", May 1989.


5. Ananjan Basu, "Generation and focusing of sheet electron beam," May 1991.


6. Aloke Kumar and Rajan Bhalla, "Wire grid quasi optical components," May 1991.


7. Gulshan Bamra and M R Ambe, "Optically controlled microwave attenuator," May 1994.


8. Hemant Minocha and Vikramjit S Grewal, "Design, fabrication and testing of ion exchanged integrated optic guides," May 1995. This project received the Rajiv Bhambawale award for the best B.Tech. project in EE Deptt. in 1994 95.


9. Rajat Katyal, "Investigation of fiber compatibility of ion exchanged integrated optic channel guides," May 1995.


10. Girish Kumar and Kshatra Niel Singh, "Numerical modelling of electromagnetic phenomena," May 1998.


11. Puneet Gupta and Shwetank Kumar, "Fabrication of fiber array blocks for pigtailing of integrated optic waveguides," July 1998 (SURA Project).


12. Sim Chee Keong and Chua Wee Teck, "MEMS antenna for RFID applications at 24 GHz," May 2003.


13. Yap Min Sze and Ng Lenna, "A triple band antenna for GSM and GPS application," May 2003.


14. Farouk Bin Abdul Kather and Reza Bin Ali, "A novel printed guiding and radiating structure," May 2003.


15. Dong Liang and Shi Yiqiong, "Optically controlled microwave circuits," December 2003.


16. Wong Kai Mun, Dominic and Lin Xiaoying, "A novel printed microwave structure," May 2004.


17. Yap Zing Zing and Teo Li Sian, "Studies on polarization mode dispersion for optical fibers," May 2004.


18. Hafiedz-ul Ashadi Bin Tamarin and Mohammed Fazli Bin Sugang, "Design of a beamforming antenna array for mobile satellite communications and navigation," May 2004.


19. Chu Quang Khai, "Studies on polarization mode dispersion in optical fibers (POTDR)," May 2005.


20. Vo Thi Minh Tan, "Studies on optical buffer and polarization mode dispersion for optical fiber loop," May 2005.


21. Yap Woei Yang and Goh Han Loong, Giles, "Design, development and characterization of a UWB antenna," May 2005.


22. Ruvin Nair and Tan Eng Han, Melvin, "A novel printed microwave structure," May 2005.


23. Seow Jun Wei and Peiwen, "Characterisation of a UWB antenna and co-design with transceiver circuits," May 2006.


24. Lee Chin Ngee and Loy Chong Keong, "Investigation of nonlinearity and dispersion in microwave photonic links," May 2006.


25. Ang Cheng Boon and Ang Cheng Hai, "A novel printed microwave structure," May 2006.


26. Lim Soo Feng, "Nonlinear distortion of laser diodes in hybrid optical-wireless systems," May 2007.


27. Su Myat Soe, "Investigation on millimeter wave photonic links," May 2007.


28. Cheng Zhong Yi, "Optical beamforming for broadband wireless networks," May 2007.


29. Zoebir and Tan Xin Hui Kenny, "A novel printed microwave structure," May 2007.


30. Chen Jun, "Guiding characteristics of a novel printed microwave structure," May 2008.


31. Ranjay Das, "Radiation characteristics of a novel printed microwave structure," May 2008.


32. Poh Longkun, "Novel designs for microwave filters," May 2008.


33. Loh Zeyin, "Novel antennas based on coaxial connectors," May 2008.


34. Poh Yeng Kai, "Photonic microwave filters," May 2008.


35. Li Rui, "A novel printed microwave structure (using ferroelectric material)," May 2009.


36. Aditya Yodha, "Novel designs for microwave filter," May 2009.


37. Teng Jin Siang, "Exploration of electro-optic modulators," May 2009.


38. Ong Sheng Jie, "A novel printed slow-wave microwave structure," May 2010.


39. Xu Mufeng, "Brain-computer-interface based musical composition," May 2010.


40. Yang Shu, "Design and fabrication of a fiber polarization analyser," Dec. 2010.


41. Joshua Chong Wei Kuang, "Confined planar helix radiating structure," May 2011.


42. Shi Zhao, "A rectangular helix microwave structure for antenna applications," May 2011.

Sponsored research and technology development

NMR microspectroscopy using microprobe chips (July'11 – June'14):

Role in project: Collaborator

Principal Investigator: A/P POENAR DANIEL PUIU

Project Description: This project is fundamentally related to the needs of miniaturization of NMR equipment. The project proposes to design, fabricate and test an original NMR micro-probe that would generate both the constant magnetic field and the excitation RF signal(s), and also perform the necessary read-out of the response induced in the sample by the latter. The initial targeted application is performing "in-cell" NMR microspectroscopic analysis of protein complexes. If the results will be encouraging, we shall subsequently extend the approach for investigation of tissues on larger areas.

Microwave Signal Processing Using Photonic Techniques (Aug'09 – June'12):

Role in project: Principal Investigator

Project Description: Recognizing that the conventional RF signal processing techniques have several disadvantages such as limited bandwidth and electromagnetic interference (EMI), processing of RF signals in the optical domain is proposed to overcome these limitations. This concept also offers great flexibility in selecting the RF frequency of operation, RF bandwidth, and the filter response. The outcome from this research work will lead to development of high performance multi-tap microwave photonic filters (MPF) which have a high main to secondary sidelobe ratio (MSSR) and tunable filter response; this combination has very significant impact on microwave signal processing techniques for various applications.

Optical processing of microwave signals using differential group delay elements, chirped fiber Bragg gratings, and nonlinear effects in fiber (July'06 – June'09):

Role in project: Principal Investigator

The project team has developed/studied

• Tunable microwave filters using differential group delay (DGD) elements such as Hi-Bi fiber and Hi-Bi chirped grating
• Tunable microwave filters with switchable single and dual free spectral range (FSR) using Sagnac loop and chirped fiber Bragg gratings
• Tunable microwave photonic filters using high-order polarization mode dispersion emulator
• Multi-wavelength power equalized laser
• Multi-tap microwave photonic filter using multi-wavelength fiber laser
• Widely tunable microwave filter based on stimulated Brillion scattering
• Nonlinearity in RF filters using wavelength division multiplexing (WDM)

Design of UWB antennas and transmitter front-end circuits (Oct.'04-March'05):

Role in project: Principal Investigator

This project was done in collaboration with IME.

• As a part of ongoing activity at IME, a fully integrated pulse generator and driver amplifier (power gain 20 dB, bandwidth 4.5 GHz) were developed.
• At NTU, two types of printed antennas were developed, covering the frequency range 3.1-10.6 GHz. For these antennas transfer functions were determined, enabling one to predict accurately the time domain performance of the antennas. An equivalent circuit model for one of the printed antennas was also developed.
• A project entitled 'Localization and identification: System architectural components and core capability development for ultra-wideband enabled sentient computing' has recently been approved by A*STAR, Singapore.

Microwave and millimeter-wave MEMS for automatic identification and tracking (1999-2003):

Role in project: Collaborator

Principal Investigator: Dr. Law Choi Look

• A prototype 2.45 GHz active back scattering RFID tag, reader and software; tag range of up to 20 meters.
• Design, implementation and testing of many different types of antennas operating at 2.45 GHz, 5.8 GHz and 24 GHz. Micromachined versions of some of these antennas (with cavity) were also designed and fabricated. A slot fed patch micromachined antenna at 24 GHz on Silicon wafer exhibited 7dBi gain and 6% bandwidth.
• Design, implementation and testing of many different types of filters operating at 2.45 GHz, 5.8 GHz and 24 GHz. 24 GHz filters using micromachined transmission lines were designed and fabricated on both GaAs and HR Silicon; simulated passband insertion loss of the filter was 2 dB.
• Design and fabrication of shunt capacitive RF MEMS switch and multi-band antenna.

Development of integrated optic power splitters using ion exchange glass waveguides (1995-98):

Role in project: Principal investigator

• S bends: Modification in the well known designs of S bends has been suggested for use in Y junction based power splitters.
• Fiber Array Blocks: Using silicon V grooved wafers, a method for preparing fiber array blocks (FABs) for pig-tailing with multiple single mode fibers has been developed; patent 'Method of manufacturing a fiber array block for integrated optics circuits and products thereof' granted in June 2005 in India.
• Ion Exchange Glass Waveguides: Based on thermal K+ ion-exchange process, technology has been developed for fabrication of low-loss channel waveguides on glass substrates. Design tools have been developed for (a) analysis and design of ion-exchange waveguides and Y-junction power splitters, (b) generating data for e-beam mask, and (c) optimizing the ion-exchange process.

Development of measurement techniques using microwave open resonators (1984-88):

Role in project: Principal Investigator

I and my co-workers developed a technique for accurate and fast measurement of high quality factors which are typically exhibited by microwave open resonators. This technique was used for accurate measurement of dielectric constant of materials and for measurement of extinction cross section of falling water drops at X band.

During a visiting assignment at FAMU/FSU College of Engineering, Florida, I participated in developing a new type of millimeter wave open resonator for cryogenic testing of high critical temperature superconducting materials.

Microwave troposcatter communication link (1980-85):

Role in project: Principal Investigator

Principal Investigator: Prof. R. K. Arora

I participated in establishing, between IIT Delhi and CEERI Pilani, an experimental troposcatter communication link operating in the frequency range 4.4 5.0 GHz. This link was used for carrying out research studies and for training of students.

Meander line ferrite phase shifter (1974-78):

Role in project: Collaborator

Developed a ferrite microstrip meander line phase shifter at X band for the first time in India. This work included planning and commissioning a small MIC laboratory with indigenously developed equipment. In addition, during a six month visit to Chalmers University of Technology, Sweden, I also participated in the development of a high power ferrite dielectric phase shifter.