研究目的
To fabricate and evaluate carbon-based stretchable antennas for passive UHF RFID tags on textile substrates, comparing their performance to silver-based alternatives and assessing their durability under cyclic stretching.
研究成果
Carbon-based stretchable RFID tags are feasible for textile-integrated applications with read ranges of 2-2.4 meters, remaining functional after 100 stretching cycles and showing some recovery. They are environmentally friendly and cost-effective but underperform compared to silver-based tags. Future work should explore different substrates and fabrication methods like 3D direct write dispensing.
研究不足
The study focused on evaluations in air without environmental stress factors or human body proximity, which could affect performance. The antenna-IC interconnection was noted as a reliability challenge, and the conductor layer thickness was non-uniform due to substrate properties. The carbon-based tags showed lower performance compared to silver-based ones, and stretching caused permanent damage.
1：Experimental Design and Method Selection:
The study involved fabricating carbon-based stretchable antennas using brush-painting on an elastic band substrate, followed by curing. Wireless performance was evaluated before and after cyclic stretching, and material properties were analyzed.
2：Sample Selection and Data Sources:
Samples included conductor lines (1 cm x 3 cm) and RFID tag antennas fabricated on a white elastic band substrate. Data were collected from resistance measurements and wireless RFID evaluations.
3：List of Experimental Equipment and Materials:
Equipment included a Fluke 111 True RMS Multimeter for resistance measurements and a Voyantic Tagformance RFID measurement system for wireless evaluations. Materials included DuPont PE671 stretchable carbon conductor paste, elastic band substrate, NXP UCODE G2iL series RFID ICs, and Circuit Works CW2400 conductive silver epoxy.
4：Experimental Procedures and Operational Workflow:
Conductor samples and RFID tag antennas were brush-painted and cured at 120°C for 1 hour. Resistance was measured before and after stretching cycles (10, 50, 100 cycles to 110% elongation). RFID tags were evaluated for read range using the Tagformance system.
5：Data Analysis Methods:
Resistance data were averaged from multiple samples. RFID read range was calculated using the threshold power method and equation (1) from the paper, considering EIRP limits.
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