UHF Radio Frequency Identification (RFID) is an electronic tagging technology that allows an object, place or person to be automatically identified at a distance without a direct line-of-sight using a radio wave exchange. Applications include inventory tracking, prescription medication tracking and authentication, secure automobile keys, and access control for secure facilities.This book begins with an overview of UHF RFID challenges describing the applications, markets, trades and basic technologies. It follows this by highlighting the main features distinguishing UHF (860MHz-960MHz) and HF (125 kHz and 13.56 MHz) identifications, in terms of reading range, environmental sensitivity, throughput and safety. The architecture of the integrated circuits and the organization of the memory are then described. One chapter is devoted to the air interface protocol aspects, including coding, modulation, multi readers operation and anti-collision algorithms to manage the tag responses. Focus will be put upon the EPC Gen2 protocol adopted in the ISO 18000 Part 6.The core of the book will cover the design and manufacturing issues of RFID tags. The influence of the propagation medium (warehouse, libraries, etc.), the tag close environment (bottles, linens, containers, carton boxes,etc.) and the coupling between tags will also be carefully addressed.The final chapter is dedicated to an industrial use case in the supply chain management, either in the retail inventory or blood traceability.

Introduction ixChapter 1 Design and Performance of UHF TAG IntegratedCircuits 11.1 Introduction 11.2 Integrated circuit atchitecture 21.3 RF to DC conversion: modeling the system 31.4 RF to DC conversion: proposed circuits and performances211.5 Voltage limiter and regulator 261.6 Demodulator 271.7 Oscillator 291.8 Modulator 301.9 Digital blocks 311.10 Technology, performances and trends 321.11 Bibliography 36Chapter 2 Design of UHF RFID Tags 412.1 Tag antenna design 412.2 Matching between the antenna impedance and the microchipimpedance 652.3 RFID tag antennas using an inductively coupled feed 792.4 Combined RFID tag antenna for recipients containing liquids832.5 Tag on metal 892.6 Bibliography 106Chapter 3 The Backscattering Technique and Its Application1113.1 Backscattering principle of communication by between-basestation and tag 1123.2 The merit factor of a tag, Deltasigma e s or DeltaRCS1163.3 Variations of Deltasigma e s = f(a) 1283.4 After the theory, RFID at UHF and SHF realities 1283.5 Measuring DeltaRCS 1383.6 The "Radar" equation 1443.7 Appendix: summary of the principal formulas 145Chapter 4 RFID Markets 1494.1 Introduction 1494.2 Market inflection point: users 1494.3 RFID: what for? 1504.4 Open- and closed-loop applications 1524.5 RFID return on investment 1534.6 Many RFID technologies 1564.7 Examples 1574.8 Next RFID: product-embedded and seamless infrastructure160Index 169