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Book PrefaceIn recent years microwaves have been used extensively in radars, transmission of
television programmes, astronomic research, radio spectroscopy, domestic ovens
and many other things. This rapid progress in microwave electronics has created
an increasing demand for trained microwave engineering personnel.
This book is intended for the undergraduate and postgraduate students
specializing in electronics. It will also serve as reference material for engineers
employed in the industry. The fundamental concepts and principles behind
microwave engineering are explained in a simple, easy-to-understand manner.
Each chapter contains a large number of solved problems which will help the
students in problem solving and design.
Chapter 1 introduces the subject with its background and applications. Chapter 2
explains the basic transmission line theory introducing the concepts of impedance
characteristics, mismatch effects, loss characteristics and graphical solution
techniques using Smith Chart, which will help in the design and analysis of
microwave components and circuits. Chapter 3 is devoted to basic EM theory and
methods of solution in different coordinate systems to help in understanding
microwave propagation in free space and in transmission guides.
Since the microwave circuits involve different configurations of signal guiding
structures, Chapter 4 deals with the characteristics of microwave transmission
lines, viz. rectangular and circular waveguides, coaxial lines, strip lines,
microstrip lines and slot lines. The excitation principles of different modes in
these structures are also described. Concepts of impedance transformation and
broad band matching for maximum power transfer and its design are covered in
Chapter 5.
Quantities such as voltage, current and impedance cannot be measured directly
at microwave frequencies where the signal is propagated as electromagnetic
waves. The directly measurable quantities are the amplitude and phase of a wave
reflected from any discontinuity relative to the incident wave amplitude and
phase, respectively. These can be described in terms of scattering parameters
through which the field equations are linearly related. The properties of scattering
matrix, analysis of various passive microwave circuits and devices using
S-parameters are described in Chapter 6.
Chapter 7 describes various resonating structures at microwave frequencies.
Analysis and design of microwave filters are covered in Chapter 8.
Chapters 9 and 10 are devoted to microwave active devices. Since a large number
of such devices have been designed during the last few years, only a selected
number of them, which have important applications in many common microwave
facilities are described and analyzed.
Chapter 11 on microwave applications will help the reader understand many
practical aspects of microwave engineering. Topics covered in this chapter include
microwave propagation equations, antennas, radar and communication systems,
and industrial applications of microwaves.
Chapter 12 is written on microwave radiation hazards and protection techniques.
Beginners may not be aware of these hazards which can be potentially
dangerous in high power applications. This chapter, therefore, provides knowledge
on safety measures.
Finally, Chapter 13 on microwave measurements links theory with practice.
This will help in establishing the experimental set-up in the laboratories and for
precision measurements in research institutions and laboratories.
The authors are indebted to all the textbooks that they have encountered as
students, and as teachers or scientists. They sincerely thank the reviewers
especially Prof. Ramesh Garg, Department of Electronics and Electrical
Communication Engineering, IIT Kharagpur, who reviewed the manuscript of
this text at its various stages and made valuable suggestions. Constructive criticism
and suggestions from the readers of the book will be gratefully accepted.ANNAPURNA DAS
SISIR K DAS |
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2008 McGraw-Hill Higher Education