Electrically Small, Superdirective and Superconductive Antennas
R.C. Hansen
Wiley Interscience • 179 pages; $100
ISBN: 0-471-78255-6
The field of electrically small antennas has long been important for frequencies below roughly 1 GHz. These antennas have characteristics in common that limit performance: low radiation resistance, high reactance, low efficiency, narrow bandwidth and increasing loss in the matching network.
Most of these limitations are shared by two other classes of antennas: superdirective and superconductive antennas. This book, aimed at being a primer on all that has been investigated and what works, is divided into three interrelated chapters: Chapter 1 on electrically small antennas, Chapter 2 on superdirective antennas and Chapter 3 on superconductive antennas.
Antenna engineers have done what is possible by rearranging the wires; future significant advances will come through use of new low loss magnetic materials and through the use of circuits to compensate for impedance deficiencies. Both areas are addressed.
Many engineers interested in these topics have not had the benefit of early papers on these three subject areas. Over the years, many ideas on improving electrically small antennas have appeared. These are discussed under three categories: designs that work, clever physics but bad numbers and pathological antennas.
In retrospect, the simplest antennas are the best: dipoles with or without flatness or loading and patches with appropriate substrates. There are no wideband electrically small antennas, unless efficiency is sacrificed for bandwidth. The relatively new field of Non-Foster circuits may change this situation.
These circuits produce negative resistance, negative inductance or positive capacitance. They are also called negative impedance converters. Each chapter includes extensive references and an author list. An overall subject index is provided at the end of the book.
To order this book, contact: John Wiley & Sons Inc.
One Wiley Drive
Somerset, NJ 08875
(800) 225-5945
Phase-locked Loop Engineering Handbook for Integrated Circuits
Stanley Goldman
Artech House • 570 pages; $149, £70
ISBN-13: 978-1-59693-154-1
This book is intended to guide readers on phase-locked loop (PLL) theory and show practical applications, designs, simulations and testing techniques.
The book emphasizes monolithic PLLs because of the growth in this area; however, the techniques also apply to other PLLs. The book has nine chapters and two appendixes. Chapters 1 though 5 discuss the basic tools that are required to do PLL analysis and specify PLL requirements. Chapters 6 to 9 extend the basics to practical simulation, application and testing problems.
Chapter 1 gives an overview of PLLs, presents background information to understand how a loop operates and gives reference material for further study of loops. Chapter 2 covers system analysis of PLLs. Control-system theory and analysis of PLLs is covered in this chapter.
Chapter 3 discusses system requirements for a PLL. Chapter 4 discusses the design of the individual components in a PLL. In Chapter 5, phase detectors are studied because understanding how phase detectors work is one of the major keys to understanding how PLLs work. Chapter 6 presents loop-compensation synthesis.
The synthesis of loop-compensation components in the loop are application dependent. Chapter 7 discusses test measurements of PLLs. Measurements of PLLs are critical in verifying the performance of the PLL. Chapter 8 covers simulation techniques for PLLs. The types of PLL simulators vary from equation solutions to behavioral-model solutions and to SPICE transistor-level solutions.
Chapter 9 presents PLL applications and extensions. PLLs are used to generate frequencies, to do clock recovery of a signal and to resynchronize signals.
To order this book, contact:
Artech House 685 Canton St.
Norwood, MA 02062
(781) 769-975 ext. 4030; or 46 Gillingham St.
London SW1V 1HH, UK
+44 (0) 207-8750