Zhizhang (David) Chen

Zhizhang (David) Chen


  • Member, Subcommittee: China Business, Inter-Society Committee, Standing Committees**
  • Member, MTT-1 FIELD THEORY AND COMPUTATIONAL EM, Technical Committees**
  • Chair, MTT-23 WIRELESS COMMUNICATIONS, Technical Committees**
  • Track Editor, Transactions Editors, MTT Transactions, Publications**
  • Topic Editor, JMW Editors, Journal of Microwaves, Publications**
Dalhousie University Department of Electrical and Computer Engineering 1360 Barrington St., PO Box 1000 Stn Central Halifax NS B3J2X4 Canada


Dr. Chen received a B.Eng. degree in Radio Engineering from Fuzhou University, Fujian, China, a M.A.Sc. degree in Radio Engineering from Southeast University (formerly Nanjing Institute of Technology), Nanjing, China,and a Ph.D. degree in Electrical Engineering from the University of Ottawa, Ottawa, Ontario, Canada,respectively. He is currentlya Professor and the Head of the Department of Electrical ad Cpmputer Engineering, Dalhousie University, Halifax, Nova Scotia, Canada. He is the Fellow of the Institute of Electrical and Electronic Engineers (IEEE), the Fellow of the Canadian Academy of Engineering (CAE), the Fellow of Engineering Institute of Canada (EIC) and a registered professional engineer and has served as a consultant for local companies.

Dr. Chen has been active in teaching, research and professional services. He has been teaching various undergraduate and graduate courses in the areas of RF/Microwave communication electronics/systems, antennas and electromagnetics, and has maintained good student evaluations. He has authored or co-authored over 270 refereed journal/conference papers and 24 industrial reports, published one book, contributed to 2 books, edited 1 research monograph and 1 conference proceeding and, and filed 4 patents in the areas of computational electromagnetics and RF/microwave circuit and system design (some of his publications have been cited extensively in SCI literatures). Dr. Chen was one of the key originators in developing new numerical algorithms (including the highly cited and commercialized three-dimensional alternating-direction-implicit finite-difference time-domain (ADI-FDTD) method) and in designing a new class of compact RF circuits and systems for wireless communications. He has been a sole/principal investigator of more than twenty-seven grants from both government and industry, including a recent NSERC Discovery Accelerator Supplement Grant, a NSERC Strategic Project Grant on Ultra-wideband Impulse Radios (2010-2013); an research & development contract from Martec Ltd. in developing structure composite microwave materials for radar applications (2011-2013); an Atlantic Innovation Fund on generic smart RF transceivers (2003-2007).


Unification of Numerical Methods: A General Mathematical Framework for Derivations and New Scheme Developments

Electromagnetic field modeling and simulation have become increasingly popular for accurate designs in modern electrical and electronic engineering, thanks to the drastic advances in computer technology. They have been applied in many areas, in particular in industrial designs where the reduction in the number of design cycles or product’s time-to-market has become very critical in a global competitive environment. For instance, in antennas, most of the practical designs are now done with simulations using commercially available software packages before actual prototyping and testing. In high-frequency electronic circuits, due to the fact that analyses based on simple circuit theory are no longer adequate, electromagnetic simulators are increasingly being used to improve design accuracy. In biomedical engineering, numerical simulations are often required to compute dosimetry in a biological body since an actual measurement is either difficult or impossible.

Many numerical methods have been developed so far for electromagnetic modeling and simulation. They present different approaches to the approximate solutions of the electromagnetic field governing equations, namely, Maxwell’s equations. They include frequency-domain methods such as the finite-difference frequency-domain (FDFD) method, finite-element (FEM) method and the conventional method of moments (MoM), and the time domain methods such as finite-difference time-domain (FDTD) method, transmission-line-matrix (TLM) method, time-domain finite-element (TD-FEM) method, and time-domain integral formulations. On one hand, these methods have been proven to be effective in solving electromagnetic structure problems with their respective advantages and disadvantages. On the other hand, they appear to have been derived on different mathematical bases and their solution procedures also appear to be different from each other, presenting challenges and difficulty for students, beginners and even practitioners in understanding and applying them.

This lecture is intended to show otherwise: all the numerical methods can be generalized or derived with the method of the weighted residuals, or method of moments; As the result, an easy way to understand and apply numerical methods is presented and a new perspective on numerical methods and a new way to develop innovative numerical methods are shown. In particular, unifying concepts among numerical methods are described and based on the concepts emerging numerical methods such as meshless, hybrid and multilevel techniques are demonstrated.