EE论坛（第326期）： Surface impedance boundary conditions (SIBCs) in computational electromagnetics
讲座题目： Surface impedance boundary conditions (SIBCs) in computational electromagnetics
主讲人：Nathan Ida（IEEE Life Fellow）
This talk discusses the general concept of Surface Impedance Boundary Condition (SIBC) and the role it plays in computational electromagnetics. Issues of derivation, implementation and applications of SIBCs in the time- and frequency-domains are discussed. Starting from the plane wave approximation and a comprehensive approach based on perturbation methods leads to SIBCs of desired order of approximation as well as systematic implementation within existing formulations for linear and nonlinear media. Formulations include FEM, FDTD, FIT and BEM but particular emphasis is on FEM and the issues associated with its implementation. Representative examples for implementation are given to point out its utility and generality. The methods described are specifically designed for low penetration applications at low frequency and are hence particularly well suited for electrical power devices although they can be used in lossy dielectrics as well and at high frequencies. The issue of errors and error estimation are given particular importance and a general method for estimating the errors and suitability of SIBCs for particular problems is discussed through a general method for a-priory decision and selection of the necessary order of estimation. Although much of the discussion is for linear media, the initial extension of SIBCs to nonlinear media is also introduced.
Nathan Ida is currently the Distinguished Professor of Electrical and Computer Engineering at the University of Akron, Akron, OH. He teaches electromagnetics, antenna theory, electromagnetic compatibility, sensing and actuation, and computational methods and algorithms. His current research interests include numerical modeling of electromagnetic ﬁelds, electromagnetic wave propagation, theoretical issues in computation, nondestructive testing of materials at low and microwave frequencies as well as in communications, especially in low-power remote control and wireless sensing. He has published extensively on electromagnetic ﬁeld computation, parallel, and vector algorithms and computation, nondestructive testing of materials, surface impedance boundary conditions, and others. He is the author or coauthor of four books. Dr. Ida is a Life Fellow of IEEE, Fellow of IET, and Fellow of the American Society of Nondestructive Testing.