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Elements of Engineering
Electromagnetics
Second Edition
Prentice Hall, 1987
By N. Narayana Rao

Preface

The first edition of this book was intended to serve as "a one-semester text in which the basic material is built up on time-varying fields and their engineering applications so as to enhance its utility for the one-semester student of engineering electromagnetic while enabling the student who will continue to take further (elective) courses in electromagnetics to learn many of the same field concepts and mathematical tools and techniques provided by the traditional treatment.'' Although the basic subject matter remains the same, this revised edition has been prepared in response to suggestions from users of the first edition and other reviewers, and to changes occurring continually in electrical engineering education (and beyond). Particular reference is made in connection with the latter to the advent of the personal computer as a pedagogical tool.

While it was acknowledged that the first edition met its goal, several deficiencies were pointed out, the major ones being (1) lack of discussion of examples involving cylindrical and spherical coordinate systems and (2) deferment of potential functions to the end of the book. In this revised and expanded edition, these deficiencies have been eliminated and many other suggested changes and additions have been incorporated. The basic philosophy of the first edition, arising from the assertion that as a prerequisite to the first EE course in fields, most schools have an engineering physics course in which students are exposed to the historical treatment of electricity and magnetism, has been preserved.

In making the changes and shifting of topics among the chapters, it was determined that inclusion of two chapters on transmission lines, one tor timedomain analysis and the second for sinusoidal steady-state analysis, instead of one as in the first edition, would provide flexibility tor the use of the book as follows:

For a three-credit one-semester course or for a four-credit one-quarter course based upon coverage of a combination of chapters, depending upon the background preparation of the students and the needs of the curriculum, some examples of which are
(a) Chaps. I through 6.
(b) Chaps. 3 through 6 plus parts of Chaps. 7, X, and 9.
(c) Chaps. 6 through 10.
For a two-semester or two-quartcr sequence covering the entire book.
As a text or supplementary text for a course emphasizing PC-assisted instruction .

Thus the material is arranged so as to facilitate the use of the book according to such options. A total of 16 PC programs of varying degrees of complexity are distributed throughout the book and PC exercises are included at the end of each chapter. The programs are written in BASIC for the IBM PC; however, with minor modifications, they can be used with the Apple microcomputers and many others.

The thread of development of the material is evident from a reading of the table of contents. Some of the salient features consist of:

Developing the bulk of the material through the use of the Cartesian coordinate system, to keep the geometry simple, while providing a sufficient number of examples involving the cylindrical and spherical coordinate systems.
Discussing materials following the presentation of electric and magnetic field concepts, and prior to the study of Maxwell's equations.
Introducing collectively Maxwell's equations for time-varying fields first in integral form and then in differential form.
Considering boundary conditions following Maxwell's equations in integral form, and potential functions and associated equations following Maxwell's equations in differential form.
Devoting a chapter to the development of selected topics in static and quasistatic fields, in addition to the coverage of static fields in earlier chapters.
Obtaining uniform plane wave solutions by considering the infinite plane current sheet source first in free space and then in material medium.
Developing time-domain analysis of transmission lines in a progressive manner beginning with the case of a resistive load and culminating in the discussion of interconnections between logic gates.
Presenting sinusosidal steady-state analysis of transmission lines comprising the topics of standing waves, resonance, power transfer, and matching, with emphasis on computer and graphical solutions.
Discussing waveguides by first introducing the parallel-plate waveguide by considering the superposition of two obliquely propagating uniform plane waves between two perfect conductors and then extending to rectangular waveguides.
Introducing radiation by obtaining the complete field solution to the Hertzian dipole field through the magnetic vector potential, and then developing the basic concepts of antennas.

Other major distinguishing features of this revised edition are (1) discussion of practical applications of field concepts and phenomena interspersed among presentations of basic subject matter, (2) descriptions of brief experimental demonstrations suitable for presentation in the classroom, and (3) inclusion of drill (D) problems with answers at the end of each section. Retained and expanded from the first edition are (1) examples distributed throughout the text and (2) a summary of the material and review questions for each chapter. End-of-chapter problems are arranged in the same order as the text material, and answers are provided for about 40% of the problems.

The author wishes to express his appreciation to many colleagues at the University of lilinois who have taught from the first edition during the period from August 1977 to December 1985. Listed in alphabetical order are S. L. Chuang, D. H. Cooper, T. A. DeTemple, S. J. Franke, L. A. Frizzell, R. Gilbert, S. Gnanalingam, K. Kim, P. W. Klock, S. W. Lee, C. H. Liu, R. L. Magin, P. E. Mast, E. A. Mechtly, K. L. Miller, P. L. Ransom, C. F. Sechrist, Jr., L. G. Smith, A. Steinbach, and K. C. Yeh. Thanks are also due to the users of the book at other schools and to the anonymous reviewers, who have provided valuable criticism. My son Hariprasad helped in the preparation of the PC programs. The typing of the manuscript was done very skillfully by Janice Stephen for this edition and by Patricia Sammann for the first edition.

The production of this book was carried out while the author was on assignment as a consultant at the University of Indonesia in Jakarta, Indonesia, under a World Bank Education Project during the academic year 1985-1986. It was a pleasure working with my Indonesian colleagues and I wish to mention particularly Dean lndradjid Soebardjo and Associate Dean Harianto Sunidja of the Fakultas Teknik in this connection. Joan McCulley performed the task as production editor in the best possible manner within the constraints of space and time.

Finally, and most importantly, this book would not have been completed without the understanding and patience of my wife, Sarojini.

N. Narayana Rao