| February 19, 2010 | ||
| 12:30 pm | to | 1:30 pm |
The IEEE Canadian Atlantic Section Signal Processing and Microwave Society Chapter wishes to invite you to the following seminar event.
Title: Adjoint Sensitivity Analysis for Microwave and Photonic Devices
Speaker: Dr. Mohamed H. Bakr, Associate Professor, McMaster University, Hamilton, Ontario, Canada
Time: 12:30pm-1:30pm, Friday, February 19, 2010
Place: Room A103, Sexton Campus, 1360 Barrington St., Halifax, Nova Scotia, Canada
Abstract:
In this presentation, we review the recent developments in adjoint sensitivity analysis of high frequency structures. Adjoint techniques aim at efficiently estimating the sensitivities of the desired response with respect to all designable parameter. Traditional Finite Difference (FD) approaches require at least n extra simulations per gradient estimation for a structure with n designable parameters. The more accurate Central Finite Differences (CFD) requires 2n extra simulations per gradient estimation. The adjoint approaches, on the other hand, require only one extra simulation regardless of the number of designable parameters. In some cases, no extra simulations are required and the original simulation is sufficient to estimate the response and its sensitivity as well. These self-adjoint approaches are applicable to the case of network parameters.
Adjoint sensitivity approaches have been applied with a number of numerical Electromagnetic (EM) techniques such as the FDTD method, the TLM method, the FEM method, and the Method of Moments (MoM). It has been applied for efficient design of microwave filters and antennas. More recently, it has been applied to sensitivity analysis of photonic devices with the Beam Propagation Method (BPM) and the FDTD method. It has been also applied to microwave imaging where the number of unknowns in the optimization problem is huge. We give a number of examples illustrating the application of adjoint sensitivity analysis to these different fields.
About the Speaker:
Mohamed H. Bakr received a B.Sc. degree in Electronics and Communications Engineering from Cairo University, Egypt in 1992 with distinction (honors). In June 1996, he received a Master’s degree in Engineering Mathematics from Cairo University. In 1997, he was a student intern with Optimization Systems Associates (OSA), inc. From 1998 to 2000, he worked as a research assistant with the Simulation Optimization Systems (SOS) research laboratory, McMaster University, Hamilton, Ontario, Canada. He earned the Ph.D. degree in September 2000 from the Department of Electrical and Computer Engineering, McMaster University. In November 2000, he joined the Computational Electromagnetics Research Laboratory (CERL), University of Victoria, Victoria, Canada as an NSERC Post Doctoral Fellow. His research areas of interest include optimization methods, computer-aided design and modeling of microwave and photonic circuits, neural network applications, smart analysis of microwave circuits, efficient optimization using time/frequency domain methods, and bioelectromagnetism. He is currently an associate professor with the Department of Electrical and Computer Engineering, McMaster University. Dr. Bakr was a recipient of a Premier’s Research Excellence Award (PREA) from the province of Ontario, Canada, in 2003.
Contact: Dr. Zhizhang (David) Chen, Dept. of Electrical and Computer Engineering, Dalhousie University
Email: z.chen@dal.ca
Tel: (902) 494-6042





