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The Book End

October 1, 1999
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The Book End

Electrodynamics of Solids and Microwave Superconductivity

Shu-Ang Zhou
John Wiley & Sons Inc.
626 pages; $130
ISBN: 0-471-35440-6

Microwave superconductivity is of great interest now that practical applications are appearing in telecommunications and other areas. This book provides an introductory and comprehensive theoretical foundation for solid electrodynamics and microwave superconductivity to engineers and applied physicists.

Chapter 1 contains a review of classical electrodynamics, basic concepts and theoretical principles for the study of electromagnetic phenomena in a material media. Chapter 2 introduces continuum electromagnetic phenomena and its interaction with mechanical phenomena in material solids that may be deformed or in motion under electromagnetic and/or mechanical loading. Particular emphasis is placed on electro-quasistatic and magneto-quasistatic problems.

Chapter 3 introduces the basic concepts of superconductivity and formulates macroscopic electrodynamic theories for superconductors in weak fields. Chapter 4 presents theoretical models for the study of electromagnetic properties and thermomagnetoelectric effects in type II  superconductors that maintain their state in very strong magnetic fields. Chapter 5 introduces the Josephson effect, the phenomenon of tunneling of electron pairs across a superconductor-insulator-superconductor junction. Applications of superconducting quantum interference devices are briefly discussed.

Chapter 6 introduces the theory of transmission lines based on a distributed model and Maxwell's equations. A full-wave analysis is performed to investigate properties of anisotropic superconducting transmission lines that may operate at extremely high frequencies. Chapter 7 is devoted to the introduction of theoretical models developed recently for the study of the interaction between electromagnetics and the mechanics of superconductors. This book is highly theoretical and not for the casual reader. However, it ties together both electromagnetic and mechanical phenomena in a way that is understandable.

To order this book, contact: 
John Wiley & Sons Inc., 
605 Third Avenue, 
New York, NY 10158 (212)
850-6336 or (800) 225-5945.

Feedforward Linear Power Amplifiers

Nick Pothecary
Artech House Inc.
204 pages; $75, £56
ISBN:0-1-58053-022-2

The physical separation of communication channels has become a major problem within wireless transmission. Today's systems must use more complex modulation schemes to increase bandwidth efficiency, and these modulation techniques require highly linear amplifiers. This book describes the challenges and behavior of high power amplifiers linearized using the feedforward technique.

Chapter 1 begins with an overview of feedforward techniques and includes an introduction to a typical radio system for cellular, PCS or IMT2000/universal mobile telecommunications system applications. Specific concepts for RF operations are also discussed. Chapter 2 presents a mathematical-based approach to discussions of amplifier input and output characteristics, signal modulation formats, signal envelopes, peak-to-average ratios and statistical analysis. Power amplifiers and system design are discussed in Chapter 3, including transistors for RF power amplifiers, amplifier efficiency, operating classes, intermodulation performance and system design issues. The concept of a linear amplifier is introduced and practical examples are presented for different system configurations.

Chapter 4 reviews different linearization techniques, including feedback (RF feedback, envelope feedback, Cartesian loop and polar loop feedback), RF synthesis, envelope elimination and restoration, predistortion and feedforward systems. The principle of operation of feedforward linearization and dual-loop feedforward linearization is presented along with discussions on signal cancellation and loop control. Chapter 5 provides a detailed analysis of feedforward performance, covering such topics as gain, input/output match, noise figure, broadband signal cancellation, error amplifier performance and system efficiency. The book presents the subject in an extremely clear and easy-to-follow manner with an abundance of supporting block diagrams and graphics and a minimum of complex theory.

To order this book, contact: 
Artech House Inc., 
685 Canton St., 
Norwood, MA 02062 
(781) 769-9750, ext. 4002; or 

46 Gillingham St., 
London SW1V 1HH, UK 
+44 (0) 171 973 8077.

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