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Fundamentals of Engineering Electromagnetics
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From the Inside Flap
This book is designed for use as an undergraduate text on engineering electromagnetics. Electromagnetics is one of the most fundamental subjects in an electrical engineering curriculum. Knowledge of the laws governing electric and magnetic fields is essential to the understanding of the principle of operation of electric and magnetic instruments and machines, and mastery of the basic theory of electromagnetic waves is indispensable to explaining action-at-a-distance electromagnetic phenomena and systems. Because most electromagnetic variables are functions of three-dimensional space coordinates as well as of time, the subject matter is inherently more involved than electric circuit theory, and an adequate coverage normally requires a sequence of two semester-courses, or three courses in a quarter system. However, some electrical engineering curricula do not schedule that much time for electromagnetics. The purpose of this book is to meet the demand for a textbook that not only presents the fundamentals of electromagnetism in a concise and logical manner, but also includes important engineering application topics such as electric motors, transmission lines, waveguides, antennas, antenna arrays, and radar systems. I feel that one of the basic difficulties that students have in learning electromagenetics is their failure to grasp the concept of an electromagnetic model. The traditional inductive approach of starting with experimental laws and gradually synthesizing them into Maxwell's equations tends to be fragmented and incohesive; and the introduction of gradient, divergence e, and curl operations appears to be ad hoc and arbitrary. On the other hand, the extreme of starting with the entire set of Maxwell's equations, which are of considerable complexity, as fundamental postulates is likely to cause consternation and resistance in students at the outset. The question of the necessity and sufficiency of these general equations is not addressed, and the concept of the electromagnetic model is left vague. This book builds the electromagnetic model using an axiomatic approach in steps--first for static electric fields, then for static magnetic fields, and finally for time-varying fields leading to Maxwell's equations. The mathematical basis for each step is Helmholtz's theorem, which states that a vector field is determined to within an additive constant if both its divergence and its curl are specified everywhere. A physical justification of this theorem may be based on the fact that the divergence of a vector field is a measure of the strength of its flow source and the curl of the field is a measure of strength of its vortex source. When the strengths of both the flow source and the vortex source are specified, the vector field is determined. For the development of the electrostatic model in free space, it is only necessary to define a single vector (namely, the electric field intensity E) by specifying its divergence and its curl as postulates. All other relations in electrostatics for free space, including Coulomb's law and Gauss's law, can be derived from the two rather simple postulates. Relations in material media can be developed through the concept of equivalent charge distributions of polarized dielectrics. Similarly, for the magnetostatic model in free space it is necessary to define only a single magnetic flux density vector B by specifying its divergence and its curl as postulates; all other formulas can be derived from these two postulates. Relations in material media can be developed through the concept of equivalent current densities. Of course, the validity of the postulates lies in their ability to yield results that conform with experimental evidence. For time-varying fields, the electric and magnetic field intensities are coupled. The curl E postulate for the electrostatic model must be modified to conform with Faraday's law. In addition, the curl B postulate for the magnetostatic model must also be modified in order to be consistent with the equation of continuity. We have, then, the four Maxwell's equations that constitute the electromagnetic model. I believe that this gradual development of the electromagnetic model based on Helmholtz's theorem is novel, systematic, pedagogically sound, and more easily accepted by students. A short Chapter 1 of the book provides some motivations for the study of electromagnetism. It also introduces the source functions, the fundamental field quantities, and the three universal constants for free space in the electromagnetic model. Chapter 2 reviews the basics of vector algebra, vector calculus, and the relations of Cartesian, cylindrical, and spherical coordinate systems. Chapter 3 develops the governing laws and methods of solution of electrostatic problems. Chapter 4 is on steady electric current fields and resistance calculations. Chapter 5 deals with static magnetic fields. Chapter 6, on time-varying electromagnetic fields, starts with Faraday's law of electromagnetic induction, and leads to Maxwell's equations and wave equations. The characteristics of plane electromagnetic waves are treated in Chapter 7. The theory and application s of transmission lines are studied in Chapter 8. Further engineering applications of electromagnetic fields and waves are discussed in Chapter 9 (waveguides and cavity resonators) and Chapter 10 (antennas, antenna arrays, and radar systems). Much of the material has been adapted and reduced from my larger book, Field and Wave Electromagnetics, but in this book I have incorporated a number of innovative pedagogical features. Each chapter of this book starts with an overview section that provides qualitative guidance to the topics to be discussed in the chapter. Throughout the book worked-out examples follow important formulas and quantitative relations to illustrate methods for solving typical problems. Where appropriate, simple exercises with answers are included to test students' ability to handle related situations. At irregular intervals, a group of review questions are inserted after several related sections. These questions serve to provide an immediate feedback of the topics just discussed and to reinforce students' qualitative understanding of the material. Also, a number of pertinent remarks usually follow the review questions. These remarks contain some points of special importance that the students may have overlooked. When new definitions, concepts, or relations are introduced, short notes are added in the margins to emphasize their significance. At the end of each chapter there is a summary with bulleted items summarizing the main topics covered in the chapter. I hope that these pedagogical aids will prove to be useful in helping students learn electromagentics and its applications. Many dedicated people, besides the author, are involved in the publication of a book such as this one. I wish to acknowledge the interest and support of Senior Editor Eileen Bernadette Moran and Executive Editor Don Fowley since the inception of this project. I also wish to express my appreciation to Production Supervisor Helen Wythe for her friendly assistance in keeping the production on schedule, as well as to Roberta Lewis, Amy Willcutt, Laura Michaels, and Alena Konecny for their contributions. Jim and Rosa Sullivan of Tech-Graphics were responsible for the illustrations. To them I offer my appreciation for their fine work. Above all, I wish to thank my wife, Enid, for her patience, understanding and encouragement through all phases of my challenging task of completing this book. D.K.C.
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From the Back Cover
Fundamental of Engineering Electromagnetics not only presents the fundamentals of electromagnetism in a concise and logical manner, but also includes a variety of interesting and important applications. While adapted from his popular and more extensive work, Field and Wave Electromagnetics, this text incorporates a number of innovative pedagogical features. Each chapter begins with an overview, which serves to offer qualitative guidance to the subject matter and motivate the student. Review questions and worked examples throughout each chapter reinforce the student's understanding of the material. Remarks boxes following the review questions and margin notes throughout the book serve as additional pedagogical aids. Back Cover Fundamentals of Engineering Electromagnetics is a shorter version of Dr. Cheng's best-selling Field and Wave Electromagnetics, Second Edition. Fundamentals has been written in summaries. Emphasizes examples and exercises that invite students to build their knowledge of electromagnetics by solving problems. Besides presenting electromagnetics in a concise and logical manner, the text covers application topics such as electric motors, transmission lines, waveguides, antennas, antenna arrays, and radar systems.
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Product details
Hardcover: 512 pages
Publisher: Pearson; 1st edition (November 10, 1992)
Language: English
ISBN-10: 0201566117
ISBN-13: 978-0201566116
Product Dimensions:
7.6 x 1.2 x 9.2 inches
Shipping Weight: 1.9 pounds (View shipping rates and policies)
Average Customer Review:
3.2 out of 5 stars
6 customer reviews
Amazon Best Sellers Rank:
#1,031,627 in Books (See Top 100 in Books)
The subject is difficult, but the author's language makes it even worse. The book makes assumptions without telling the reader and very complex mathematical calculations are not worked out.A couple of weeks into the course, I found other textbook that were much clearer than Cheng's.
Excellent Book. It has many excercises,explained with very clearly.This book is intended for a second course in the University. For example, first course is using the resnick book and the second course is using this.
I though it was a hardcover, other than that it got home fast!
The author's language is convoluted, explanations are very brief, equations are thrown at your face with little explanation as to why or how they come into place, the worked examples are also quite convoluted and the author offers little explanation to solve them, theres little physics as to how EM actually works.This seems to be the general norm when it comes to undergraduate engineering electromagnetics books, authors somehow feel they should condense explanations and math for engineering students and just throw in a bit of transmission line theory and antenna aplications, however EM is a very difficult subject to learn and condensing explanations and math actually makes things worse and harder to understand!, one needs to understand the fundamental principles of how EM works.It is true that most engineers are not that interested in particles and such, which are covered in the traditional physics EM books, but that doesnt mean that we are only looking for a handbook of formulas and applications in an EM book!, we already have the Standard Handbook for Electrical Engineers if we need to look for a quick formula, instead engineers need to learn EM at the fundamental level so they can later focus on engineering applications.There are plenty of great EM books for engineers at the graduate level, like those by Pozar, Gonzalez, Balanis, Ramo, etc... but I have not found a single good Engineering EM book that truly teaches EM theory at the undergraduate level. Its my conclusion that engineers should stick to the traditional physics EM books like the one by Griffiths to get a good understanding of EM theory, and then focus on engineering applications.Also, $200 for a paperback book???
Cheng's logical development of electromagnetics is indeed novel, but the only real way to appreciate it is to first have had a decently rigorous course on electromagnetism or have read another electromagnetics book. The reason why I say this is because at the onset of the book, Cheng puts forth his electromagnetic model, but there is absolutely almost no motivation for this model. It seems completely arbitrary, although it does yield familiar results. No basis for the model based on experiment is provided; therefore, I suggest that one first read a book that takes one through the historical path of development -- leading from experiment to generalization. Also, I have found a major error in the theory of the book. In Chapter 6 when Cheng is talking about potential functions, he correctly derives a formula for the curl of a potential function. Now, the basis of the book is that one can develop electromagnetics in an orderly fashion by specifying both the divergence and the curl of a vector. So, in order to fully develop the potential vector field, he says "we are still at liberty to choose the divergence of A." He then states a formula known as the Lorentz condition for potentials and motivates it simply because it simplifies another equation. However, this is logically incorrect. Just because one knows the curl of a vector field does not mean one is at liberty to state its divergence. Again, Cheng is completely arbitrary here and provides no basis for why he does this other than the fact that it simplifies an equation. Many other books correctly deal with this matter -- even on the introductory level. What really happens is that the Lorentz condition is a result of the relation between electromagnetics and the theory of relativity; when electromagnetic theory and relativity are combined, the Lorentz condition follows logically. Sadiku's Elements of Electromagnetics correctly states this, as do other texts. The reason why this is so important is that this is the crucial link between showing that electromagnetic fields that vary through time are represented as waves! This violates the nature of the book -- that it should be logically consistent, orderly, and non-abrubt in its reasoning. Finally, I would like to say that Cheng's book Field and Wave Electromagnetics has the same downfall. However, I believe every serious student, engineer, and even scientist should read through Cheng's Field and Wave Electromagnetics because it is more rigorous. What Cheng has done is really interesting, but I simply cannot recommend this for any first time student. And, do not buy this book; buy his Field and Wave Electromagnetics because it is superior. Last and final note: the development of transformers is much inferior to most books (including his own Field and Wave Eletromagnetics). Check out my review on his other text.
I liked this book because of it's elegance and the fact that there are hardly any errors. But, I thought it expected the student to make too many assumptions in order to do the problems. This is frustrating for a first course (or any course) in electromagnetics when you're just gettting used to using vector calculus and are new to Maxwell's equations.Another problem I had is the lack of down-to-earth descriptions. To derive a formula and add one sentence at the end does not convey what is physically going on.I thought "Fundamentals of Applied Electromagnetics" by Fawwz T. Ulaby was much more accessible for a first course in electromagnetics.
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