Principles of Inductive Near Field Communications for Internet of Things

Near field communication devices and the emerging field of Internet of things require efficient short range communication techniques. Classical telecommunication theory however has so far focused on radiating electromagnetic signals which is more suited to terrestrial communication systems. Over the last decade however considerable research and applications of inductive methods have emerged as innovative approaches for secure short range communications by changing the paradigm of an established model of electromagnetic communications. We have witnessed the emergence of embedded inductive medical devices, magneto-inductive waveguides, inductive pots and cooking devices, magneto-inductive sensors, wireless power transfer, inductive hearing aids and the emerging inductive point-to-point communication specifically termed near-field communication (NFC) as used in mobile phones and payment cards to name a few. While there exist a large set of distributed methods and algorithms detailing the design and performances of such applications, a significant gap is observed as a lack of detailed collection of the methods in one place which could be easily understood and used quickly by someone seeking to apply the methods.In this book this missing gap is filled with the required details and the theory of near field communication systems including both the radiating and reactive (energy coupling) near-field systems in addition to the well known far field radiation techniques. The book details the fundamental expressions and design methods which facilitate the creation of near field devices and equipment including embedded biomedical implants. The book contains recent advances in inductive communications, performance, limitations and a collection of applications. It also lays a strong foundation for the application of inductive methods for creating Internet of Things systems.

Johnson I. Agbinya

Preface 1 Introduction to Near Field Communications 2 Near Field Propagation in Free Space 3 Near Field Magnetic Induction Communications 4 Capacity of Near Field Magnetic Induction Communications 5 Near Field Magnetic Induction MISO Communication Systems 6 Circuit Models and Power Estimates of Antennas 7 Resistive and Inductive Properties 8 Circuit Models of Near Field Magnetic Induction Communication Links 9 Efficiency of Near Field Magnetic Induction Communication Links 10 Crosstalk in Near Field Magnetic Communication Links 11 Coding 12 Modulation 13 Broadband Near Field Magnetic Communications 14 Effects of Trans-Impedance on Crosstalk 15 Magneto-Induction Link Budgets 16 Magneto - Inductive Waveguide Devices 17 NFC Applications 18 Wireless Power Transfer 19 NFC Applications (Part two) 20 NFMIC Simulator Reference Appendix I Index