Accessible Radio-Frequency Analysis
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This document discusses the development of accessible radio-frequency analysis technology for chipless RFID tags. It describes generations of tag readers from expensive lab equipment to a cheaper designed system using a microcontroller and digital synthesis device. The system is able to separate and decode signals to extract information stored in the resonant frequencies of multi-resonant tag structures. Potential applications discussed include analyzing milk quality in rural areas and performing real-time materials characterization to screen mail for hazardous contents.
Accessible Radio-Frequency Analysis
- 1. Accessible Radio-Frequency Analysis Neil Gershenfeld Esa Masood Rich Fletcher John Loof Physics and Media Group
- 2. Generations of Tag Readers for Chipless RFID tags HP Network Analyzer (~$100k) ‘Read Anything’ Design MOMA board Current Design (~$150)
- 3. System Design PIC Micrcontroller ADC ADC Digital Direct Synthesis Device I Q Output Buffer Amplifier Dual Directional Coupler Reference Probe Active Probe Magnitude Phase Differential Magnitude and Phase Detector Low-Pass Filter RS-232 Interface To PC Signal Generation Signal Separation Receiver
- 4. Space Into Frequency • Storing information in physical structures • Utilizing frequency instead of time domain • Multi-resonant planar structures • Chipless, low-cost RFID tags 1 2 3
- 5. Resonant frequencies of tag Peaks in magnitude response (~6 peaks) Bits of information (~6 bits/peak) Decoding Information
- 6. Materials Characterization Milk-Quality Analysis (MLA) • Interest in non-destructive methods of analyzing biological substances • Measuring milk content in rural India – critical step in collection and distribution of milk • Instrument can provide complex frequency spectrum of milk: Fast + non-invasive measurement method Postal Mail Security (USPS) • Need for low-cost instrumentation for analysis of mail content: Detection of hazardous material • Need to detect varying material types: Paper, metal, plastic, wood… • RF dielectric constant analysis : Real-time materials characterization for wide variety of materials
- 7. Analysis Data Milk Application Mail Application
Editor's Notes
- #6: 5