**Preface of Electromagnetic Wave Theory, Last Edition in 2008**

*by ***J. A. Kong**

This book presents a unified macroscopic theory of electromagnetic waves
in accordance with the principle of special relativity from the point of view
of the form invariance of the Maxwell equations and the constitutive relations.
Great emphasis is placed on the fundamental importance of the k vector in
electromagnetic wave theory. We introduce a fundamental unit Ko = 2π meter−1
for the spatial frequency, which is cycle per meter in spatial variation.
This is similar to the fundamental unit for temporal frequency Hz, which is
cycle per second in time variation. The unit **Ko** is directly
proportional to the unit Hz; one **Ko** in spatial frequency
corresponds to 300 MHz in temporal frequency.

This is a textbook on electromagnetic wave theory, and topics essential to
the understanding of electromagnetic waves are selected and presented. Chapter
1 presents fundamental laws and equations for electromagnetic theory. Chapter
2 is devoted to the treatment of transmission line theory. Electromagnetic
waves in media are studied in Chapter 3 with the **kDB** system
developed to study waves in anisotropic and **bianisotropic**
media. Chapter 4 presents a detailed treatment of reflection, transmission,
guidance, and resonance of electromagnetic waves. Starting with Cerenkov radiation,
we study radiation and antenna theory in Chapter 5. Chapter 6 then elaborates
on the various theorems and limiting cases of Maxwell's theory important to
the study of electromagnetic wave behavior. Scattering by spheres, cylinders,
rough surfaces, and volume inhomogeneities are treated in Chapter 7. In Chapter
8, we present Maxwell's theory from the point of view of Lorentz covariance
in accordance with the principle of special relativity. The problem section
at the end of each section provides useful exercise and applications.

The various topics in the book can be taught independently, and the material
is organized in the order of increasing complexity in mathematical techniques
and conceptual abstraction and sophistication. This book has been used in
several undergraduate and graduate courses that I have been teaching at the
Massachusetts Institute of Technology.

The first version of the book was published in 1975 by Wiley Interscience,
New York, entitled Theory of Electromagnetic Waves, which was based on my
1968 Ph.D. thesis, where the concept of **bianisotropic media**
was introduced. The book was expanded and published in 1986 with the present
title and its second edition appeared in 1990. Since 1998, it has been published
by EMW Publishing Company, Massachusetts. The development of the various concepts
in the book relies heavily on published work. I have not attempted the task
of referring to all relevant publications. The list of books and journal articles
in the Reference Section at the end of the book is at best representative
and by no means exhaustive. Some of the results contained in the book are
taken from many of my research projects, which have been supported by grants
and contracts from the National Science Foundation, the National Aeronautics
and Space Administration, the Office of Naval Research, the Army Research
Office, the Jet Propulsion Laboratory of the California Institute of Technology,
the MIT Lincoln Laboratory, the Schlumberger-Doll Research Center, the Digital
Equipment Corporation, the IBM Corporation, and the funding support associated
with the award of the S. T. Li prize for the year 2000.

During the writing and preparation of the book, many people helped. In particular,
I would like to acknowledge Chi On Ao for formulating the TEX macros, and
Zhen Wu for editing the text and constructing the index. Over the years, many
of my teaching and research assistants provided useful suggestions and proofreading,
notably Leung Tsang, Michael Zuniga, Weng Chew, Tarek Habashy, Robert Shin,
Shun-Lien Chuang, Jay Kyoon Lee, Apo Sezginer, Soon Yun Poh, Eric Yang, Michael
Tsuk, Hsiu Chi Han, Yan Zhang, Henning Braunisch, Bae-Ian Wu, Xudong Chen,
and Baile Zhang. I would like to express my gratitude to them and to the students
whose enthusiastic response and feedback continuously give me joy and satisfaction
in teaching.

*J. A. Kong*

Cambridge, Massachusetts

December 2007

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