Keynote Speakers

1. Rendong Nan, "World Largest Antenna FAST – Five-hundred meter Aperture Spherical radio Telescope"

2. Le-Wei Li, "Metamaterial Microstrip Antennas and Arrays: A New Approach for Metamaterial Research at Microwave Frequency "

3. Xiaodong Chen, "Quasi-optical Systems for Remote Sensing and Space-Astronomy"

4. Bumman Kim, "Recent Trend of Power Amplifiers for Mobile Communication"

Title:

World Largest Antenna FAST – Five-hundred meter Aperture Spherical radio Telescope

Speaker:

Rendong Nan, Chinese Academy of Sciences

Abstract:

Five hundred meter Aperture Spherical radio Telescope (FAST), is a Chinese mega-science project to build the largest single dish radio telescope in the world. Its innovative engineering concept and design pave a new road to realize huge single dish in the most effective way. Being the most sensitive radio telescope, FAST will enable astronomers to jump-start many science goals, for example, the neutral hydrogen line surveying in the milky way and galaxies, detecting faint pulsars, looking for the first star shining, hearing the possible signal from other civilizations, and etc.
    The idea of sitting a large spherical dish in Karst depression is rooted in Arecibo telescope hosted by the NAIC of Cornell University. FAST is an Arecibo-type antenna with 3 outstanding aspects: the unique Karst depression as the site; the active main reflector which corrects spherical aberration on the ground to achieve full polarization and wide band without involving complex feed system; and the light focus cabin driven by cables and servomechanism plus a parallel robot as secondary adjustable system to carry the most precise parts of the receivers. The feasibility studies for FAST have been carried out for 15 years, being supported by Chinese and world astronomical communities. Funding for project FAST has been approved by the National Development and Reform Commission (NDRC) in July of 2007 with a capital budget ~ 667 millions RMB and a project time of 5.5 years from the foundation. The first light is expected to be in 2014.

Biography:

Research Interests
Radio Astrophysics,
Radio Astronomical methodology and technology

Education and Career History
Academic Qualifications:
1963 - 1968   B. S., ultrahigh frequency and electronic technology, Tsinghua University
1978 - 1981   M.S., astronomy and astrophysics, University of Science and Technology of China
1982 - 1987   Ph.D, astronomy and astrophysics, University of Science and Technology of China
Employment:
1968 -1978  Worker and technician in Tonghua Electronic Factory of Tonghua City of Jilin Province
1982 -1984  Assistant researcher, Beijing Astronomical Observatory of the Chinese Academy of Sciences
1989 -1992  Associate professor, Beijing Astronomical Observatory of the Chinese Academy of Sciences
1992 -now  Professor, National Astronomical Observatory of the Chinese Academy of Sciences, Chief Scientist and General Engineer of the megascience facility-FAST

Professional Leadership
1993 - 1998, deputy director of Beijing Astronomical Observatory
1996 - 1999, Member of the Committee on Search for an Extraterrestrial Intelligence, International Academy of Astronautics
2006 - 2009,  President of Division Radio Astronomy of International Astronomical Union
2009 -            Member of ATNF Steering Committee, CSIRO of Australia

Title:

Metamaterial Microstrip Antennas and Arrays: A New Approach for Metamaterial Research at Microwave Frequency

Speaker:

Le-Wei Li, National University of Singapore

Abstract:

Although it is easier to realize metamaterials in microwave frequency region for negative refractions, there was still little progress toward extensive practical applications. At microwave frequencies, potential applications include primarily (a) substrate materials for antenna and microwave component designs and fabrications, and (b) absorbing materials for engineering and radar applications. There are, however, still primarily fundamental issues or limitations of metamaterials at microwave frequencies: narrow bandwidth (when both negative permittivity and negative permeability fall within the same band) and high loss (due to the ohmic loss and especially radiation loss of inclusion elements), and this drawbacks become especially serious and severe when the SRR- and other inclusion-types of metamaterials are used as substrate of the patch antenna. The present talk will address these fundamental issues and thereafter brief some recent advances of the matamaterial microstrip antennas and arrays which were achieved by employing the negative permittivity and permeability concepts. With this implementation, it is to demonstrate that the bandwidth and gain of conventional microstrip antennas and their arrays can be significantly enhanced by applying the planar metamaterial patterned structures directly on the upper array elements and the bottom ground of the dielectric substrate, so that the antennas and arrays can have much high performance.

Biography:

Joshua Le-Wei Li received his Ph.D. degree in Electrical Engineering from Monash University, Melbourne, Australia, in 1992. Since 1992, he has been with the Department of Electrical & Computer Engineering at the National University of Singapore where he is currently a Full Professor. In 1999-2004, he was seconded to High Performance Computations on Engineered Systems (HPCES) Programme of Singapore-MIT Alliance (SMA) as a Course Coordinator and SMA Faculty Fellow. In May-July 2002, he was a Visiting Scientist with Research Laboratory of Electronics at Massachusetts Institute of Technology; and in October 2006, he was an Invited Visiting Professor with University of Paris VI, France. He was an Invited Visiting Professor with Institute for Transmission, Waves and Photonics at Swiss Federal Institute of Technology, Lausanne (EPFL) between January and June 2008 in Switzerland. In March 2010, he also joined University of Electronic Science and Technology of China in Chengdu as a Qian-Ren Talent Scheme Chair Professor and Founding Director of Institute of Electromagnetics. His current research interests include electromagnetic theory, computational electromagnetics, radio wave propagation and scattering in various media, microwave propagation and scattering in tropical environment, and analysis and design of various antennas. In these areas, he has (co-)authored a book, Spheroidal Wave Functions in Electromagnetic Theory (New York: Wiley, 2001), 48 book chapters, over 310 international refereed journal papers, 48 regional refereed journal papers, and over 350 international conference papers. Prof. Li received a number of awards from various professional bodies or institutions. He has been a Fellow of IEEE since 2005, and a Fellow of The Electromagnetics Academy since 2007 (selected member since 1998). He also serves as a Guest Editor, an Associate Editor and an (Overseas) Editorial Board Member several international and regional archival technical journals.

Title:

Quasi-optical Systems for Remote Sensing and Space-Astronomy

Speaker:

Xiaodong Chen, University of London, UK

Abstract:

In millimeter wave and sub-millimeter wave remote sensing and radio-astronomy applications, several quasi-optical (QO) reflectors are cascaded to form a feed system to the main antenna. Such Quasi-Optical antenna systems are used at increasingly high frequencies up to and into the THz-region. The latest launched Planck and Herschel telescopes operating in the frequency bands of 30-857GHz and 448 – 5.3THz, respectively, posed many challenges in designing their QO systems. This talk will give a brief overview of the Planck and Herschel missions and their related engineering challenges in radiometry at first. Then, the talk will introduce a fast design technique for analyzing complex quasi-optical systems developed at Queen Mary, University of London and Beijing University of Posts and Telecommunications. The design and analysis technique in question is a combination of two numerical methods, i.e. the Diffracted Gaussian Beam mode Analysis (DGBA) to transport signal beams between focusing reflectors while accounting for edge diffraction and the Periodic Method of Moments (PMM) to compute the emergent beam fields of either transmission and/or reflection for signal conditioning components interleaved between reflectors. The talk will also presents the experimental verification of this design and analysis technique based on a number of Quasi-optical systems, including a tri-reflector Compact Antenna Test Range (CATR) which was aimed for THz antenna system metrology.

Biography:

Xiaodong Chen  received  the degree of B.Eng from the University of Zhejiang, Hangzhou, China in 1983,  and the degree of  Ph.D from the University of Electronic Science and Technology of China, Chengdu in 1988. 
In September 1988 he joined the Department of Electronic Engineering at King's College, University of London, as a Postdoctoral Visiting Fellow. In September 1990 he was employed by the King’s College London as a Research Fellow working on numerous research projects funded by the industry and governments. In March 1996 he was appointed to an EEV Lectureship at King's College London. In September 1999 He joined the Department of Electronic Engineering at Queen Mary and Westfield College, University of London. He was promoted to a Reader in the same College in September 2003. In October 2006, he was appointed to a full Professorship of Microwave Engineering at Queen Mary, University of London. In 2003, he was appointed as the Director of the International Research Lab set up jointly between Queen Mary and Beijing University of Posts and Telecommunications. He is also visiting/adjunct professor to Beijing University of Posts and Telecommunications, University of Westminster(UK), University of Electronic Science and Technology of China and Tianjin University.
His research interests are in microwave devices, antennas and propagation, and bioelectromagnetics. He has authored and co-authored over 250 publications (book chapters, journal papers and refereed conference presentations). He was invited to give keynote/invited presentations in a number of international conferences. He has involved in the organisation of many international conferences and professional activities. He served as Co-Chairman in China/UK-Europe Workshop on THz Technologies since 2008, IEEE International Workshop on Antenna Technology, 2007, IEE International Symposium on Ultra Wide Band Radios and Antennas, 2004, and IEE/IoP/IPEM International Workshop on RF Interaction with Humans, 2003 and 2005, Executive Chairman in IEEE International Conference on Telecommunications (ICT)’2002. He is currently a Senior member of IEEE, and a member of UK EPSRC Review College and Technical Panel of IET Antennas and Propagation Professional Network. He served as a Steering Committee member in a joint EC project on Galileo Advanced Concept (2006-2008).

Title:

Recent Trend of Power Amplifiers for Mobile Communication

Speaker:

Bumman Kim, Pohang University of Science and Technology, Korea

Abstract:

Linear Power amplifiers become very a hot issue for the mobile communication. The performance of the unit PAs is improved significantly using GaN technology. The class E, J, F and saturated amplifiers are heavily researched. To improve the performance further, the unit amplifiers are utilized in transmitter architectures such as Doherty amplifier, Envelope Tracking, and class-S. These advanced architectures will be introduced. Finally, the digital predistortion technique will be discussed, which is the main linearization technique of the transmitters.

Biography:

Dr. Bumman Kim is the Chong Yul Lee Professor for the Department of Electrical Engineering and is Director of the Microwave Application Research Center at Pohang University of Science and Technology. He has a Ph.D. in Electrical Engineering from Carnegie-Mellon University, an M.S.in Electrical Engineering from the University of Texas and a B.S. in Electronics Engineering from Seoul National University. His work has concentrated on the field of microwave and millimeter-wave circuits and devices. He has developed linear power amplifiers (LPAs) and transmitters for mobile communication applications including LPAs based on feed-forwarding techniques, pre-distortion, base-band error correction architectures and most recently Doherty amplifiers. He had worked for the GTE Labs and the Central Research Labs of Texas Instruments. At TI, his research was devoted to the monolithic microwave integrated circuits (MMICs) and devices. He pioneered the development of power MESFETs at millimeter wave frequencies. He built the first MMIC at mm-wave frequency and the first semiconductor based oscillator operating at frequencies over 100 GHz.
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