Event Details
A System of S-Parameter Extraction From FDTD Simulations Applicable to Inhomogeneous Waveguides and Evanescent Modes
Presenter: Dr. Wojciech Gwarek - Warsaw University of Technology, Warsaw, Poland
Supervisor:
Date: Wed, June 12, 2002
Time: 10:00:00 - 11:00:00
Place: EOW 430
ABSTRACT
Abstract
The problem of proper S-matrix definition in the case of transmission lines with losses and modes below cut-off is revisited. It is shown that in those cases, due to non-real reference impedance, the classical S-matrix definition based on power waves becomes controversial: the power waves do not obey the Maxwell equations and the calculated reflection coefficient is different from the physical one. To resolve those difficulties, alternative definitions of modal voltages and currents, and modal incident and reflected waves, are proposed. The method of S-parameter extraction built thereupon is applied to wide-band analyses in a multi-mode environment including evanescent modes. Somewhat unusual properties of the generalized S-matrices for evanescent modes are also discussed.
Biography
Dr. Gwarek is currently a professor at the Warsaw University of Technology. He received his M.Sc. in Electrical Engineering from Massachusetts Institute of Technology in 1974 and Ph.D. from Warsaw University of Technology in 1977. He authored over 100 papers in refereed journals and one textbook and has given numerous conference presentations. He is a Fellow of IEEE and is recognized worldwide as an expert in electromagnetic field theory and numerical methods.
FREE AND OPEN TO THE PUBLIC
For Further Information Contact:
Dr. M.A. Stuchly (721 6029)