| Book Review |
Reviewed by Reinaldo Perez |
Anatoly's entire career has been in the shielding business. Some of the first things that I learned about shielding, I learned from him through his papers. This book is a very well researched book (just as his other book in cable shielding was) and shows Anatoly's expertise on the subject. I personally will use this book as a reference any time I need information about the subject of shielding.
The final chapter
in the book is titled, |
There are nine chapters in the book, the last chapter being an appendix. The book covers many aspects of electromagnetic shielding problems and, as the title indicates, these problems are tailored to those found in wired and wireless equipment. The book starts from fundamental ideas on the subject of electromagnetic compatibility and progresses to electromagnetic coupling mechanisms and shield parameters. Techniques for identification, evaluation, and measurements of shielding are discussed. Typical shielding subjects such a cables, interconnections, enclosures, PCB and circuit hardening techniques, shield terminations and grounding are also addressed. Many of the aspects of shielding in the book are discussed at the system level. The study of shielding is very much related to the electromagnetic compatibility approach, antenna models, crosstalk theory, and general system analysis. Anatoly combines all of the methodologies of signal propagation, electromagnetic coupling analysis, field theory, and circuit theory, with a treatment of shielding which accounts for common and differential transmission mode EMI effects and the use of optimization theory for system design concerning shielding. The book emphasizes both theory and the more practical aspects of electromagnetic shield design, evaluation, and application in the system. The book leads the reader from the most general ideas of electromagnetic compatibility to electromagnetic energy coupling and transfer mechanisms in shielded circuits to design and selection methods of optimal shields which are effective.
The first chapter title "Introduction to System EMI and EMC" gives a review of the fundamental definitions of EMI and EMC, addressing electronic system problems in the interference environment, the role of system elements and interconnections. In this chapter the discussion concentrates on ideas to be used in further analysis of electromagnetic shielding in the following chapters. The concepts of electronic system EMI synthesis and analysis are applied to develop the principles of electronic system and system element EMC performance to generate models of electromagnetic emissions and immunity. Chapter 2 presents the fundamentals of electromagnetic shielding as one of the most important interference mitigation techniques. The chapter discusses the effects of electromagnetic shielding as they relate to system level applications and outlines the fundamental mathematical principles of shielding. The specifics of and differences between various electromagnetic shielding effectiveness definitions and parameters are discussed. A comprehensive approach to electromagnetic shielding is introduced as well as some models. Chapter 3 is titled "Transfer Parameters of Electromagnetic Shields and Enclosures." The chapter introduces differential parameters which characterize energy transfer across the shield. The electrical and mathematical models are developed, addressing the shield performance both as a shield and as a high frequency conductor. The analysis extends over the most popular shield designs: homogeneous and non-homogeneous, single and multi-layer, foil and mesh, apertures, serve and spiral tapes, braid, magnetic and non-magnetic, linear and non-linear materials. Energy transfer is considered in such applications as cables, ground and power planes in PCB, shelves, shielded rooms, and electromagnetic gaskets. Chapter 4 addresses the shield-to-external and shield-to-internal field coupling, the interaction of the coupling and transfer function, as well as the impact of the shield on coupling between shielded circuits and lines. The chapter addresses induction, near field and far field coupling scenarios. However, the concept of close, near, and far field are largely dependent upon the geometry and physical properties of the particular interferers and propagation media, even for the same rate of signal variations.
Chapter 5 addresses shielding effectiveness for EMI protection. It makes use of the comprehensive shielding system model to assemble the shield transfer and coupling functions into the respective figures of merit in order to evaluate shielding effectiveness in important practical applications. It addresses such subjects as the shielding effectiveness of product enclosures, architectural structures, and mobile objects, the crosstalk attenuation between shielded lines, printed circuit board traces, and cables, and the rationale, specifics, and problems of shielding system grounding and termination. The presented factual data, test results, and examples enhance the understanding of complex shielding problems and provide useful reference material. In Chapter 6, measurement techniques for shielding are addressed. The chapter starts with a discussion on shielding measurement philosophies. The particular measurement techniques and their practical implementations are discussed from basic principles. The importance of and techniques for shield to shield measuring equipment calibration are emphasized.
Chapter 7 is titled "Shielding Engineering" and addresses practical aspects important to shielding design, manufacturing, and utilization. First, low and high level shielding models are formulated and reviewed. At the low level, the bypass shield model clarifies the roles of shield imperfections, connectors, gaskets, and ground loops in the shield EMC performance. At the high level, the concept of shielding system topology is considered. Shield performance modeling and optimization are illustrated with practical examples. The final chapter in the book is titled, "This Brave New World of Electromagnetic Shielding." It summarizes some developments in the electromagnetic shielding industry. Some of these developments are old principles with new applications, others are more innovative. The final chapter is an appendix that provides a reference background in electromagnetic and circuit theory. The chapter also addresses numerical methods and techniques in solving shielding problems.
The book is the result of Anatoly's 30 years experience in the area of shielding and is highly recommended to those EMC engineers who are interested in the subject. EMC