Speaker: Assoc. Prof. Hakan Bağcı, KAUST

Topic: "Time Marching Schemes for Solving Integral Equations of Electromagnetics"

Location: Middle East Technical University, Ankara, Turkey

Abstract:  Electromagnetic devices and systems are at the heart of technological advances driving and changing many areas of science and engineering including efficient energy management, biomedical electronics, communications and computing, and even environmental monitoring and civil design. The common denominator of these systems is that they are electrically large, have a wide dynamic range of frequency of operation, their device components are geometrically intricate with dimensions varying by orders of magnitude, and finally their designs require many repetitions of characterizations with different parameters.

The research field of computational electromagnetics enables accurate, efficient, and robust numerical modeling and characterization of such systems. This is a challenging task because the common characteristics listed above translate into large matrix systems with millions (if not billions) of unknowns to be solved for, multi-scale discretizations, and ill-conditioned equations followed by prohibitively long executions times.

This presentation will focus on stable, efficient, and accurate time marching schemes developed to address some of these challenges. More specifically, I will describe (i) an explicit marching-on-in-time (MOT) scheme for solving time domain integral equations (TDIEs), which avoids inversion of dense matrices for increased efficiency and (ii) an MOT-TDIE solver for simulating electromagnetic interactions on high-contrast scatterers, which makes use of a carefully designed extrapolation scheme for increased stability. Numerical experiments, which demonstrate accuracy, efficiency, and applicability of these methods, will also be presented.

Bio:  Hakan Bagci received the B.S. degree in Electrical and Electronics Engineering from the Bilkent University, Ankara, Turkey, in 2001; and the M.S. and Ph.D. degrees in Electrical and Computer Engineering from the University of Illinois at Urbana- Champaign (UIUC), Urbana, IL, USA, in 2003 and 2007, respectively.

From June 1999 to July 2001, he worked as an Undergraduate Researcher with the Computational Electromagnetics Group, Bilkent University. From August 2001 to December 2006, he was a Research Assistant with the Center for Computational Electromagnetics and Electromagnetics Laboratory, UIUC. From January 2007 to August 2009, he was a Research Fellow with the Radiation Laboratory, University of Michigan, Ann Arbor, MI, USA. Since August 2009, he has been with the King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia, where he is currently an Associate Professor of Electrical Engineering.

His research interests include various aspects of theoretical and applied computational electromagnetics with emphasis on well-conditioned frequency and time domain integral equation formulations and their discretization, hybrid time domain integral and differential equation solvers, accurate, stable, and efficient marching schemes for time domain solvers, stochastic characterization of electromagnetic field and wave interactions on complex geometries, and solution of two and three dimensional electromagnetic inverse scattering problem using signal processing techniques. He authored or co-authored 85 journal papers and 180 papers in conference proceedings.

  Date and Time




  • Middle East Technical University
  • Ankara, Ankara
  • Turkey 06800



Prof. Hakan Bagci of KAUST


Time Marching Schemes for Solving Integral Equations of Electromagnetics