tag to tag communication
CONTENTS
1. ABSTRACT…………………………………………………………2
2. INTRODUCTION………………………...…………………………3
3. THEORY…………….………………………………………………6 3.1. LINK BUDGET…………………………………………………6 3.2. NEAR FIELD COUPLING BETWEEN TAGS………………...8 3.3. MODULATION DEPTH………………………………………..9 3.4. SIMULATION…………………………………………………11
4. IMPLEMENTATION………………………………………………12 4.1. SYSTEM…………………………………………………….....12 4.2. READER TAG………………………………………………...13
5. EXPERIMENTS……………………………………………………16 5.1. VERIFYING HFSS SIMULATION OF COUPLED DIPOLE..16 5.2. MEASURING TAG TO TAG DISTANCE…………………...18
6. CONCLUSION……………………………………………………..23
7. REFERENCE………………………………………………………24
CHAPTER 1 ABSTACT
we describe a novel passive RFID system and deal with direct tag-to-tag communication using RFID technology in the presence of external radio frequency field. Tags talk by modulating the external field and thus backscattering the commands to each other. We present the system concept and show its hardware implementation based on TI MSP430 microcontroller. We also provide the theoretical model for modulation depth vs. distance which agrees with experimental results (maximum tag-to-tag communication distance). Finally, we discuss possible applications and outline future work.
CHAPTER 2
INTRODUCTION
Over the past decade, UHF RFID has progressed significantly. Passive UHF RFID tags are emerging in use for many applications, such as tracking apparel and vehicles. The sensitivity for RFID tag ASICs have improved from -8dBm to -18 dBm [1-2] resulting in a three-fold read range improvement. And lastly, ISO 18000-6C (also known as “Gen2”) has been largely adopted as the UHF RFID protocol standard. Despite this progress, transacting with UHF RFID tags still requires a relatively expensive and power hungry RFID reader whose radio contains an active transmitter and a receiver with full-quadrature (IQ) demodulation.
In this paper, we demonstrate
1. ABSTRACT…………………………………………………………2
2. INTRODUCTION………………………...…………………………3
3. THEORY…………….………………………………………………6 3.1. LINK BUDGET…………………………………………………6 3.2. NEAR FIELD COUPLING BETWEEN TAGS………………...8 3.3. MODULATION DEPTH………………………………………..9 3.4. SIMULATION…………………………………………………11
4. IMPLEMENTATION………………………………………………12 4.1. SYSTEM…………………………………………………….....12 4.2. READER TAG………………………………………………...13
5. EXPERIMENTS……………………………………………………16 5.1. VERIFYING HFSS SIMULATION OF COUPLED DIPOLE..16 5.2. MEASURING TAG TO TAG DISTANCE…………………...18
6. CONCLUSION……………………………………………………..23
7. REFERENCE………………………………………………………24
CHAPTER 1 ABSTACT
we describe a novel passive RFID system and deal with direct tag-to-tag communication using RFID technology in the presence of external radio frequency field. Tags talk by modulating the external field and thus backscattering the commands to each other. We present the system concept and show its hardware implementation based on TI MSP430 microcontroller. We also provide the theoretical model for modulation depth vs. distance which agrees with experimental results (maximum tag-to-tag communication distance). Finally, we discuss possible applications and outline future work.
CHAPTER 2
INTRODUCTION
Over the past decade, UHF RFID has progressed significantly. Passive UHF RFID tags are emerging in use for many applications, such as tracking apparel and vehicles. The sensitivity for RFID tag ASICs have improved from -8dBm to -18 dBm [1-2] resulting in a three-fold read range improvement. And lastly, ISO 18000-6C (also known as “Gen2”) has been largely adopted as the UHF RFID protocol standard. Despite this progress, transacting with UHF RFID tags still requires a relatively expensive and power hungry RFID reader whose radio contains an active transmitter and a receiver with full-quadrature (IQ) demodulation.
In this paper, we demonstrate
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