| 佐磊,孔维业,张一卓,雷碧航.容器内液位高度对RFID系统性能影响研究[J].电子测量与仪器学报,2025,39(1):216-224 |
| 容器内液位高度对RFID系统性能影响研究 |
| Research on the influence of liquid level height in containeron the performance of RFID system |
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| DOI： |
| 中文关键词: 射频识别 液体环境 阻抗分析 标签天线 传输系数 |
| 英文关键词:radio frequency identification liquid environment impedance analysis tag antenna transmission coefficient |
| 基金项目:国家自然科学基金（61971175）项目资助 |
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| Author | Institution |
| Zuo Lei | Faculty of Electrical and Automation Engineering, Hefei University of Technology, Hefei 230009, China |
| Kong Weiye | Faculty of Electrical and Automation Engineering, Hefei University of Technology, Hefei 230009, China |
| Zhang Yizhuo | Faculty of Electrical and Automation Engineering, Hefei University of Technology, Hefei 230009, China |
| Lei Bihang | Faculty of Electrical and Automation Engineering, Hefei University of Technology, Hefei 230009, China |
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| 摘要点击次数: 52 |
| 全文下载次数: 62 |
| 中文摘要: |
| 针对容器内液位高度变化对无源超高频（UHF）RFID标签性能影响的问题，基于RFID工作原理电磁波传播理论，首先推导了无源UHF RFID系统链路预算模型；并利用功率传输系数，分析了容器内液体导致的标签阻抗匹配失谐对系统性能的影响；为验证理论模型，采用仿真和室内实验相结合的方法，通过仿真实验和分析，建立了标签竖置和横置部署情况下，标签应答信号功率（RSSI）随液位高度变化的分段模型。在开阔的室内环境中，分别测试了在容器内液位高度变化时Alien9662和Alien9640两款标签的RSSI。实验设计覆盖了液位高度从0~140 mm的范围，测量了不同液位条件下的信号强度变化。理论分析及实验结果表明：当液位沿天线弯折臂变化时，RSSI随液位高度的升高而逐渐减小；当液位沿电小环变化时，RSSI随液位高度的升高呈先增大后减小的非线性变化；两款标签的RSSI随液位高度改变的变化规律与所建立分段模型保持一致，验证了模型的有效性。研究结果不仅为理解液体环境对RFID系统的性能影响提供了理论依据，也为实际应用中标签部署与设计提供了参考依据。 |
| 英文摘要: |
| To address the problem of how liquid level height variations within containers impact the performance of passive ultra-high frequency (UHF) RFID tags, a link budget model for passive UHF RFID systems was derived based on the electromagnetic wave propagation theory of RFID. Using the power transmission coefficient, the study analyzes how liquid-induced impedance mismatch within containers affects system performance. To validate the theoretical model, a method combining simulations and indoor experiments was employed. Through simulation and analysis, segmented models were established to describe the variation in tag response signal strength (RSSI) with changes in liquid level height for both vertical and horizontal tag orientations. In an open indoor environment, the RSSI of two tags, Alien9662 and Alien9640, was measured as the liquid level varied, covering a range from 0 mm to 140 mm to observe signal strength changes under different liquid levels. Theoretical analysis and experimental results indicate that when the liquid level rises along the bent arm of the antenna, RSSI gradually decreases with increasing liquid level height, whereas when the liquid level rises along the electric small loop, RSSI exhibits a nonlinear trend, initially increasing and then decreasing. The RSSI change patterns for both tags align with the segmented model, verifying its accuracy. These findings provide a theoretical basis for understanding the effects of liquid environments on RFID system performance and offer practical insights for tag deployment and design in real-world applications. |
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