Title: Time Reversal: Solutions to Inverse Problems Without Green’s Functions

Prof. Zhizhang (David) Chen（陈志璋 教授）, 加拿大工程院院士、加拿大工程研究院院士、IEEE Fellow

Time：13 Oct. 2021, 3:30Pm

Address：365游戏大厅沧海校区365游戏大厅——致信楼N723

Abstract：The time-reversal (TR) techniques have been studied and developed for solutions of inverse problems in acoustics and various other areas that requires no involvements and computations of Green’s functions. In electromagnetics, the time-reversal techniques have attracted much attention and have found applications in remote sensing, imaging and wireless communications. In this talk, I will present recent developments in theorizing the time reversal method with digital signal processing techniques in both time- and frequency-domains. I will introduce an theorem and describe an optimization technique to avoid false solutions with the theorem. Iwillalso show the use of electromagnetic entropy and kurtosis for improving TR performances. I willthen show the time-reversal applications to faulty array-element diagnosis, radiation reconstructions and possible RF/microwave structure synthesis. They open potentially new paradigms in designs of electromagnetic circuit structures in RF/microwave systems and in locations of radiations sources in EMC and EMI.

BIO：Zhizhang Chen（陈志璋）received the Master degree in Radio Engineering from Southeast University, P. R. China, the Ph.D. degree in Electrical Engineering from the University of Ottawa, Canada. He was a NSERC post-doctoral fellow with McGill University, Montreal, Canada. He is a professor in Electrical and Computer Engineering. He has authored and co-authored over 400 journal and conference papers and has been an a guest editor, track editor and associate editor for IEEE journals including the IEEE Transactions on Microwave Theory and Techniques and the IEEE Journal on Multiscale and Multiphysics Computational Techniques. His current research interests are in time-domain electromagnetic modelling techniques, ultra-wideband wireless communication systems and wireless power transfer. He is the Fellow of the IEEE, the Fellow of the Canadian Academy of Engineering and the Fellow of the Engineering Institute of Canada.