[Report]:Professor Tapan K. Sarkar from Syracuse University and his party came to our school for academic report
time: 2011-04-27

Time: 3:30-5:00 pm on March 29th
Location: Lecture Hall of Yifu Science Building (second floor)

Title: WHO IS THE FATHER OF ELECTRICAL ENGINEERING?
Tapan K. Sarkar: According to Sir James Jeans: In his hands electricity first became a mathematically exact science and the same might be said of other larger parts of Physics. He did develop almost all aspects of Electrical Engineering. To start with, as Sir Ambrose Fleming pointed out he provided a general methodology for the solution of Kirchoff’s laws as a ratio of two determinants. He showed how a circuit containing both capacitance and inductance would respond when connected to generators containing alternating currents of different frequencies. He developed the phenomenon of electrical resonance. He showed that between any four colors an equation can be found, and this was confirmed by experiments. Secondly, from two equations containing different colors a third may be obtained. A graphical method can be described, by which after fixing arbitrarily the position of three standard colors that of any other color can be obtained by experiments. Finally, the effect of red and green glasses on the color-blind was presented, and a pair of spectacles having one eye red and the other green was proposed by him as assistance to detect doubtful colors. He was the first to show that in color blind people, their eyes are sensitive only to two colors and not to three as in normal eyes. Today, the extent of macular degeneration of the retina is characterized by his yellow spot test. He also developed the fish eye lens to look into the retina with little trauma. He took the first color photograph. Today, color television works on this principle, but his name is rarely mentioned.

He wrote the first paper on control theory showed for the first time that for stability the characteristic equation of the linear differential equation has to have all its roots with negative real parts. He not only introduced the first statistical law into physics but also introduced the concept of ensemble averaging which is an indispensable tool in communication theory and signal processing. He also did other significant works which made Albert Einstein remark: One scientific epoch ended and another began with him –, and, From a long view of the history of mankind – seen from, say, ten thousand years from now – there can be little doubt that the most significant event of the nineteenth century will be judged as his discovery of the …… – Richard Feynman.                  

He always delivered scientific lectures for the common people using models. He also was very prolific in writing limericks, as we will see.

BIOGRAPHY                                                                                                                                      

Tapan K. Sarkar received the B.Tech. degree from the Indian Institute of Technology, Kharagpur, in 1969, the M.Sc.E. degree from the University of New Brunswick, Fredericton, NB, Canada, in 1971, and the M.S. and Ph.D. degrees from Syracuse University, Syracuse, NY, in 1975.

From 1975 to 1976, he was with the TACO Division of the General Instruments Corporation. He was with the Rochester Institute of Technology, Rochester, NY, from 1976 to 1985. He was a Research Fellow at the Gordon McKay Laboratory, Harvard University, Cambridge, MA, from 1977 to 1978. He is now a Professor in the Department of Electrical and Computer Engineering, Syracuse University. His current research interests deal with numerical solutions of operator equations arising in electromagnetics and signal processing with application to system design. He obtained one of the “best solution” awards in May 1977 at the Rome Air Development Center (RADC) Spectral Estimation Workshop. He received the Best Paper Award of the IEEE Transactions on Electromagnetic Compatibility in 1979 and in the 1997 National Radar Conference. He has authored or coauthored more than 300 journal articles and numerous conference papers and 32 chapters in books and fifteen books

Dr. Sarkar is a Registered Professional Engineer in the State of New York. He received the College of Engineering Research Award in 1996 and the Chancellor’s Citation for Excellence in Research in 1998 at Syracuse University. He was an Associate Editor for feature articles of the IEEE Antennas and Propagation Society Newsletter (1986-1988), Associate Editor for the IEEE Transactions on Electromagnetic Compatibility (1986-1989), Chairman of the Inter-commission Working Group of International URSI on Time Domain Metrology (1990–1996), Distinguished Lecturer for the Antennas and Propagation Society from (2000-2003), Member of Antennas and Propagation Society ADCOM (2004-2007), on the board of directors of ACES (2000-2006), vice president of the Applied Computational Electromagnetics Society (ACES), and a member of the IEEE Electromagnetics Award board (2004-2007). He is currently an associate editor for the IEEE Transactions on Antennas and Propagation.



Title:Multiple-Bandgap Defected Ground Structure and Its Applications to Highly Selective Microwave Bandpass Filters

Reproter:Sio-Weng Ting

Department of Electrical and Electronics Engineering

Faculty of Science and Technology

University of Macau, Macao, China


ABSTRACT

Defected Ground Structure (DGS) is a simple microwave structure with a transmission zero or bandgap at finite frequency, inspired on the traditional photonic bandgap structure. This bandgap is widely used in rejecting the unwanted response of guided wave and radiated wave devices. This presentation will be specifically related with the investigation of compact multiple-bandgap DGS, as well as its implementations and applications. Several examples of the DGS elements with two, three, four and five bandgaps will be presented. A notable guided wave circuit is the highly selective microstrip bandpass filter that will be the focus of this work. This filter is always required in modern wireless communication systems to provide better signal selection and interference rejection. To realize the bandpass filter with such a stringent requirement a new dual-zero DGS bandpass unit will be developed using an end-coupled microstrip resonator pair, enabling a very compact component will be mathematically formulated and implemented.


BIOGRAPHY    

TING SIO WENG received the B.Sc, M.Sc and PhD degrees (awarded the highest classification in both M.Sc and Ph.D) in Electrical and Electronics Engineering from University of Macau in 1993, 1997 and 2008, respectively. In 2009, he worked in Syracuse University, Syracuse, USA as a post-doctorate research associate. Currently he is an Assistant Professor of the Department of Electrical and Electronics Engineering at University of Macau and is affiliated with the Wireless Communication Laboratory. His research focuses on the electromagnetic bandgap structures, passive microwave circuits, solutions of EM problems using integral-equation based MoM methods, and radiation assessment of mobile communication systems. Dr. Ting has coordinated 6 industrial projects and participated in 13 scientific research projects, mainly in the areas of wireless communication and microwave engineering.