This book explains how UHF tags and readers communicate wirelessly. It gives an understanding of what limits the read range of a tag, how to increase it (and why that might result in breaking the law), and the practical things that need to be addressed when designing and implementing RFID technology. Avoiding heavy math but giving breadth of coverage with the right amount of detail, it is an ideal introduction to radio communications for engineers who need insight into how tags and readers work.

New to this edition:

• Examples of near-metal antenna techniques

• Discussion of the wakeup challenge for battery-assisted tags, with a BAT architecture example

• Latest development of protocols: EPC Gen 1.2.0

• Update 18000-6 discussion with battery-assisted tags, sensor tags, Manchester tags and wakeup provisions


Electrical/Electronic engineers

Table of Contents

Chapter 1. Introduction

1.1 What, When, and Where, Wirelessly

1.2 Why Would You Read This Book?

1.3 What Comes Next?


Further Reading

Chapter 2. History and Practice of RFID

2.1 It All Started with IFF

2.2 Making It Cheap

2.3 Making and Selling: Tracking Big Stuff

2.4 Tracking Small Stuff: AutoID and the Web of Things

2.5 RFID Systems and Terminology

2.6 Types of RFID

2.7 The Internet of Things and UHF RFID

Further Reading


Chapter 3. Radio Basics for UHF RFID

3.1 Electromagnetic Waves

3.2 Describing Signal Voltage and Power

3.3 Information, Modulation, and Multiplexing

3.4 Backscatter Radio Links

3.5 Link Budgets

3.6 Effect of Antenna Gain and Polarization on Range

3.7 Adding a Battery

3.8 Propagation in the Real World

3.9 Capsule Summary: Chapter 3

Further Reading


Chapter 4. UHF RFID Readers

4.1 A Radio’s Days (And Nights)

4.2 Radio Architectures

4.3 Radio Components

4.4 RFID Transmitters

4.5 RFID Receivers

4.6 Digital-Analog Conversion and Signal Processing

4.7 Packaging and Power

4.8 Capsule Summary

Further Reading


Chapter 5. UHF RFID Tags

5.1 Power and Powerlessness

5.2 RF to DC

5.3 Getting Started, Getting Data

5.4 Talking Back

5.5 Tag IC Overall Design Challenges

5.6 Packaging: No Small Matter

5.7 Other Passive Ways

5.8 Assault of the Battery

5.9 Capsule Summary

Further Reading


Chapter 6. Reader Antennas

6.1 Not Just for Insects Anymore

6.2 Current Events: Fundamentals of Antenna Operation

6.3 Antennas for Fixed Readers

6.4 Antennas for Handheld or Portable Readers


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