译者序 华盛顿州立大学 John Schneider教授的《 Understanding Finite Di.erence Time Domain Method》是一本非常难得的计算电磁学入门的优秀教材。该书除了由简到繁系统地介绍时域有限差分理论和方法外，从软件工程的角度结合理论和方法，指导学生一步一步编写一个优秀的时域有限差分应用程序，使学生得到了时域有限差分方法和软件工程两方面的学习和训练。该书经过在哈尔滨工程大学电磁场与微波专业的教学与实践，得到了学生广泛好评，取得了良好的教学效果。 参加该书翻译的有哈尔滨工程大学余文华、李文兴、张朝柱、段瀚林、孙照清、李千、卓庆坤、王美玉、张文、刘鑫博、郭晓亮、田春胜、赵月明、刘玉敬、张兰超、孔媛媛、曹小东。该书由国防科技大学刘培国教授校对。 该书适合作为电磁场与微波技术专业高年级本科生和研究生的教材或参考书，也可以作为年轻教师和工程师的参考书。该书为哈尔滨工程大学研究生规划教材。 余文华于哈尔滨工程大学 致中国读者 This book grew out of a set of notes I prepared for a graduate-level course on the .nite-di.erence time-domain (FDTD) method I taught at Washington State University. The notes were intended to supplement the textbook I used for the course, Computational Electrodynamics: The Finite-Di.erence Time-Domain Method by Ta.ove and Hagness (3rd ed., Artech House, 2005). The goal of the course was to provide students not only with a thorough understanding of the FDTD method, but also to ensure they were able to implement functional FDTD code and to tackle meaningful, challenging, and interesting problems. (For example, one of the homework assignments in the class was to duplicate the patch antenna modeling in David Sheen’s groundbreaking 1991 MIT Ph.D. dissertation.) Each time I taught the course I added to the notes to the point that students believed the assigned textbook should be considered optional, i.e., the material I provided stood on its own as a complete text in and of itself. I have shared the English version of the course material widely and have been .attered by the response. From the feedback I have received, the material has served individuals interested in learning the FDTD method and writing functional code extremely well. Although this material was used in a graduate-level course, undergraduate students often took the course. They only needed to be su.ciently motivated, to have had an introductory course in electromagnetics and, hopefully, to have had some programming experience. I truly feel that by understanding the FDTD method one can better understand Maxwell’s equations and electromagnetics in the continuous world. Thus, I can easily envision this material servingas the textbook for an upper-division undergraduate course. The FDTD method is computationally expensive. Many interesting simulations can be quickly and easily realized in languages such at MATLAB or Java, but to get the most from the technique it is necessary to code in a computationally e.cient language such as FORTRAN or C. In this book, C is the language of choice. Although C may be considered arcane or archaic by some, as used here it is quite accessible—readers need not have much, or perhaps even any, familiarity with C. The FDTD method, at its core, is an extremely simple technique and if you are able to implement a FOR-loop, you have almost all the coding skills you need to do meaningful simulations (a slight exaggeration, perhaps, but as you will see, only a slight one). Finally, the Chinese edition of this material would not exist without the work of Prof. Wenhua Yu and his students. Thus, I would like to express my deep appreciation to Prof. Yu for reaching out to me and to all those who made the translation of this material possible. John Brand Schneider Washington State University

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