Understanding the Electromagnetic Field

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Understanding the Electromagnetic Field is an entry level textbook for graduate students with a focus on the electromagnetic field. This book explores the relationship between the field and electric charges. The earlier part of the book deals with the derivation of Maxwell's equations from experimental laws. Next, the electromagnetic field is studied in the light of special relativity, leading logically to the quantum theory of radiation. Quantum mechanics is introduced as a quantum field theory of the electromagnetic field. The rules of quantum mechanics are developed in a systematic way, with relativistic quantum electrodynamics explaining some puzzles that emerge in classical electrodynamics. A chapter is devoted to the study of angular momentum in quantum mechanics, uniquely showing its importance in the understanding of the interaction between the field and charges. The geometry of the space in which the electromagnetic field is embedded is shown to be significant. General relativity provides a relationship between the geometry of space and the presence of matter. The final chapter is devoted to deriving the fundamental equations of general relativity. Mathematical expressions are derived for the effect of gravity on the electromagnetic field, and measurable results are calculated. The prerequisites of this book are Newtonian physics, calculus and linear algebra. Exercises are provided throughout the book.

LOW ELECTROMAGNETIC FIELD EXPOSURE WIRELESS DEVICES: FUNDAMENTALS AND RECENT ADVANCES

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DESCRIPTION LOW ELECTROMAGNETIC FIELD EXPOSURE WIRELESS DEVICES Comprehensive resource covering methods of designing energy efficient and low EMF wireless device techniques Supported with real case studies and recent advancements and laying the foundation for future advancements in the field, Low Electromagnetic Field Exposure Wireless Devices: Fundamentals and Recent Advances describes both ways, i.e. hardware and software, in which the user-centric wireless communication devices can be designed to reduce the levels of EMF to limit the potential long-term effects of EMF on human health. The text covers state-of-the-art and advanced topics such as EMF exposure standards and rationale, EMF evaluation tools, radio resource allocation, energy conservation, energy harvesting, EMF-aware antenna designs, and MIMO, and highlights advancements in this exciting field to date. To aid reader comprehension, the text contains numerous tables, illustrations, and photographs. In Low Electromagnetic Field Exposure Wireless Devices: Fundamentals and Recent Advances, readers can expect to find information on: Fundamentals and key practices, and mechanisms and assessment methods, of exposure to electromagnetic fields The role of the smartphone on the assessment of exposure from 5G and antenna design considerations and techniques for low SAR mobile handsets Numerical exposure assessments of communication systems at higher frequencies and age-dependent exposure estimation using numerical methods Reinforcement learning and device-to-device communication in minimizing EMF exposure and emission-aware uplink resource allocation scheme for non-orthogonal multiple access systems For wireless user equipment designers and hardware engineers, teachers in wireless communications, and postgraduate students in antennas for communication systems, Low Electromagnetic Field Exposure Wireless Devices: Fundamentals and Recent Advances is a must-have resource, covering an important topic that is expected to only grow in significance as future technological developments are made.

ELECTROMAGNETIC SHIELDING: THEORY AND APPLICATIONS (2版)

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DESCRIPTION Comprehensive Resource for Understanding Electromagnetic Shielding Concepts and Recent Developments in the Field This book describes the fundamental, theoretical, and practical aspects to approach electromagnetic shielding with a problem-solving mind, either at a design stage or in the context of an issue-fixing analysis of an existing configuration. It examines the main shielding mechanisms and how to analyze any shielding configuration, taking into account all the involved aspects. A detailed discussion on the possible choices of parameters suitable to ascertain the performance of a given shielding structure is also presented by considering either a continuous wave EM field source or a transient one. To aid in reader comprehension, both a theoretical and a practical engineering point of view are presented with several examples and applications included at the end of main chapters. Sample topics discussed in the book include: Concepts in transient shielding including performance parameters and canonical configurations Time domain performance of shielding structures, thin shields, and overall performance of shielding enclosures (cavities) How to install adequate barriers around the most sensitive components/systems to reduce or eliminate interference Details on solving core fundamental issues for electronic and telecommunications systems via electromagnetic shielding For industrial researchers, telecommunications/electrical engineers, and academics studying the design of EM shielding structures, this book serves as an important resource for understanding both the logistics and practical applications of electromagnetic shielding. It also includes all recent developments in the field to help professionals stay ahead of the curve in their respective disciplines.