研究目的
To review conventional chipless RFID technology and analyze advanced millimeter wave spatial-based chipless RFID systems with an optimized MIMO-SAR technique for high-resolution image acquisition and quick reading process.
研究成果
Spatial-based chipless RFID systems offer significant advantages over conventional techniques, including higher data capacity, lower tag cost, and reliability. The optimized MIMO-SAR technique reduces reading time and hardware complexity, making it feasible for commercialization. Future work should focus on improving reader design and expanding applications such as tag hiding and use on conductive objects.
研究不足
The spatial-based technique requires mmwave frequencies, which may limit practical deployment due to higher cost and complexity of readers. Scanning techniques like SAR are slow, and MIMO systems, while faster, still involve hardware complexity. Tag fabrication with printing methods may have inaccuracies, and the system's performance in real-world environments (e.g., with bending or non-LoS conditions) needs further validation.
1：Experimental Design and Method Selection:
The paper reviews and analyzes existing chipless RFID techniques, focusing on spatial-based systems using electromagnetic imaging. It employs theoretical models and simulations, such as CST for parameter optimization, and discusses various scanning techniques like SAR and MIMO-SAR.
2：Sample Selection and Data Sources:
The study uses data from previous research and patents, including tag designs from Vubiq, Inksure, Somark, and MMARS group. Tags are printed using commercial printers like SATO with aluminum ink on paper substrates.
3：List of Experimental Equipment and Materials:
Equipment includes Performance Network Analyzer (PNA) for measurements, SATO printer for tag fabrication, and antennas for transmission and reception. Materials include conductive inks, paper substrates, and metallic elements for tags.
4：Experimental Procedures and Operational Workflow:
The process involves designing tags (e.g., meander and strip line polarizers), printing them, and using SAR or MIMO techniques for scanning. Measurements are taken at 57-64 GHz ISM band with cross-polarized antennas to reduce noise.
5：Data Analysis Methods:
Data is analyzed using signal processing techniques for image reconstruction, genetic algorithms for MIMO optimization, and comparisons of backscattered signals (e.g., S21 parameters) to decode tag data.
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