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关键词： RFID   Cortex-M0   ISO14443A   ISO14443B   免驱动  

摘要： 提出一款多功能免驱动高频RFID读卡器。选用Cortex-M0内核单片机,结合WS1850S芯片与MFRC520/522/523系列芯片软硬件兼容的优点,基于USB HID标准协议进行二次开发和设计,并从硬件结构与功能、软件系统设计、天线匹配电路验证三个方面对读卡器的硬件电路进行验证。结果表明,该读卡器能够免驱安装,能对ISO14443A、ISO14443B、CPU射频卡物理信息进行成功读取,并且支持十进制或十六进制不同数据格式输出,证明该读卡器电路设计的合理性和可行性。

关键词： 气动物流传输系统   无线射频识别   电子标签   读写器天线  

摘要： 气动物流传输系统在运用过程中存在发瓶操作烦琐、系统故障或断电后不能续传等问题,将射频识别(RFID)技术引入医用气动物流传输系统中,可有效解决上述问题。该文介绍了RFID的工作原理及其在气动物流传输系统中应用时的设计要点,包括天线发送频率的选择及天线结构、天线和标签的相对位置、电子标签的选择等;通过测试分别确定了RFID读写器天线与金属物、RFID标签之间的合适距离;介绍了RFID应用于气动物流传输系统的实现过程;总结了应用中的常见问题及解决方案。

关键词： 射频识别(RFID)技术   CSV文件格式   工艺流程管理  

摘要： 随着市场对产品质量可追溯性要求的不断提升,工艺流程管理的重要性亦随之显著增强。采纳了射频识别(RFID)技术,以实现工艺流程的实时记录,从而取代了传统的工艺流程卡片。鉴于CSV文件格式具备存储数字和文本等表格数据的能力,该格式被选定为替代原有的工艺流程卡存储方式,用于记录产品的生产过程。经过多次实验验证,该设计方案已被证明具有卓越的可靠性和稳定性,并显示出巨大的推广潜力。

关键词： Impedance   Radiofrequency identification   Transponders   Antennas   Antenna measurements   Semiconductor device measurement   Impedance measurement   Complex impedance measurement   impedance matching   radio frequency identification (RFID)   RFID antenna   RFID chip   RFID tag   RFID transponder  

摘要： The knowledge on methods for measuring input impedance in microelectronic circuits across various operating frequencies is a critical aspect of designing efficient RFID transponder antennas. The precise determination of this parameter is particularly important for optimizing the overall performance of automatic radio-identification systems in compliance with national standards. The conventional methods in this scope involve direct measurements of RFID chip parameters by using expensive and sophisticated apparatus (e.g., vector network analyzer). Other indirect methods rely on the approximate estimation of this parameter for the fully assembled transponder operating within a test RFID system in a controlled laboratory environment (e.g., anechoic chamber). Therefore, an interesting alternative is to indirectly determine the chip input impedance, by adjusting parameters of the connected antenna and monitoring variations in the minimum power that is supplied to the transponder and at which the chip can be activated (power on tag forward (POTF) characteristic). Thus, the objective of this research is to establish fundamental theoretical relationships that can be used to anticipate fluctuations in the interrogation zone characteristics. These relationships should enable the prediction of how the characteristics change for various levels of impedance mismatch between the antenna and the RFID chip, as values of signal power and operating frequency vary.

关键词： Antennas   Receiving antennas   Impedance   UHF antennas   Optimization   Sensors   Layout   Antenna measurements   Monitoring   UHF measurements   Antenna optimization   infusion monitoring   low cost   sensing consistency coefficient (SCC)   ultrahigh frequency radio-frequency identification (UHF RFID)  

摘要： Ultrahigh frequency radio-frequency identification (UHF RFID) tags are extensively utilized for their cost-effective provision of rudimentary sensing capabilities. However, the existing UHF RFID analog systems face efficiency challenges in multitag scenarios due to the need for individual radiated power adjustments for each tag to accommodate varying chip impedances. This letter introduces a novel sensing consistency coefficient and power transfer efficiency to ensure a point-to-point mapping between antenna-sensitive factors and auto-tuned values, independent of spatial factors across supported received power levels. By optimizing the dimensions of the RFID antenna layout based on chip impedance values at these power levels, we achieve a power-independent consistent mapping model that does not compromise communication performance. Furthermore, we propose an infusion monitoring system that employs a flexible, passive UHF RFID tag placed exterior to the drip chamber. This system triggers an early warning indicator for low liquid levels within the drip chamber by measuring auto-tuned values, prompting nursing staff to take follow-up actions. Experimental results demonstrate consistent mapping relationships between antenna-sensitive factors and auto-tuned values under diverse spatial conditions. This study not only enhances the time efficiency of the read/write device in multitag environments but also paves the way for new applications of UHF RFID in medical monitoring and similar fields.

关键词： Internet of Things (IoT)   Radio Frequency Identification (RFID)   Privacy-preserving   Lightweight authentication  

摘要： The rapid growth of the Internet of Things (IoT for short) has expanded its applications across diverse domains, including smart healthcare, smart homes, and smart factories. Among the key technologies driving this evolution, Radio Frequency Identification (RFID for short) plays a pivotal role in IoT ecosystems due to its automation, identity recognition, and portability attributes. These features make RFID essential for simplifying device management and enhancing traceability in practical scenarios, particularly in healthcare, where it optimizes the management of patient medical records. However, frequent information exchanges within RFID systems pose a significant challenge, as inadequate authentication mechanisms can lead to unintended exposure of sensitive personal data. Fan et al. propose a lightweight RFID authentication protocol in IEEE Transactions on Industrial Informatics to address this issue. Unfortunately, our analysis finds several security vulnerabilities in their protocol, including susceptibility to impersonation, traceability, and secret disclosure attacks. In this paper, we develop a new lightweight privacy-protection RFID protocol, building upon Fan et al.'s framework. Our security evaluation demonstrates that the proposed protocol effectively mitigates these threats, ensuring the confidentiality and integrity of sensitive data in RFID-enabled systems.

关键词： radio frequency identification   crack detection   passive sensor   chipless   structural health monitoring   antenna tag  

摘要： RFID technology has been widely researched and used for structural health applications because of its compact, wireless, and scalable nature. This technology is divided into chipped and chipless sensors. Chipped sensors are costly due to their chipped tags, have narrowband operations, and contribute to shortcomings in detection capability. Chipless tags provide real-time monitoring of cracks in harsh environments like high-temperature areas and high electromagnetic interference areas. This paper presents a design of a novel chipless hybrid circular-hexagon sensor that uses the frequency signature-based method for metal crack detection and characterization using wideband frequency. This sensor is small in size (16 mm x 16 mm x 1.4 mm) and easily mountable in hard-to-reach areas. It is a low-cost, passive chipless sensor that can wirelessly monitor the cracks in metallic structures. The radar cross-section of the chipless tag shows a shift in the resonant frequency of the tag under crack and no crack conditions. Key contributions of this work are that through simulations and experimental investigation, the tag is shown to be able to detect mm-scale cracks, validating the concept and correlating the presence and size of the cracks based on the shift in resonant frequencies in which a pair of Vivaldi antennas are used as a transmitter and receiver to connect to the VNA. The designed small sensor tag is tested in a benchtop setup with no prior calibration, imitating the real-time environment conditions for crack detection.

关键词： Estimation   Location awareness   Logic   Accuracy   Receiving antennas   Real-time systems   Attenuation   Modulation   Clocks   Amplitude shift keying   Sensor applications   Angle-of-Arrival (AoA)   localization   radio frequency identification (RFID)   software-defined radio (SDR)  

摘要： Radio frequency identification (RFID) is an enabling technology for many applications of the Internet-of-Things. The most interesting one is its use for localization and tracking purposes. Among all the possible localization techniques, angle-of-arrival (AoA) estimation performed through phase interferometry proved to be accurate and lightweight in terms of complexity, allowing operation in real-time. In this letter, we propose an approach to UHF RFID tag localization by real-time AoA estimation through a dedicated digital architecture. After introducing the idea and its underlying principles, we discuss a preliminary validation campaign using a software-defined radio and a custom RF front-end aiming to demonstrate the accuracy consistency varying the path loss and the signal power levels.

关键词： inventory efficiency   radio frequency identification (RFID) cabinet   inventoried flags  

摘要： This paper explicitly proposes a novel algorithm to enhance the inventory efficiency of densely stacked tags in a radio frequency identification (RFID) cabinet. By flexibly setting the inventoried flags, tags are not repeatedly inventoried by different interrogator antennas in the RFID cabinet. Comprehensive experiments are conducted to validate the proposed algorithm's feasibility. The experimental results show that for 560 stacked tags, the proposed algorithm achieves 100% inventory accuracy while reducing inventory time by 40%, thereby significantly enhancing the efficiency of tag inventory management.

关键词： RFID   multi-object 3D reconstruction   3D bounding box estimation  

摘要： To meet the new requirements of Industry 4.0, the logistics field has introduced 3D reconstruction technology. Computer vision-based solutions face challenges like bad lighting conditions and line-of-sight constraints. Meanwhile, the widespread adoption of RFID tags in supply chains offers an opportunity to enhance current reconstruction methods. In this article, we propose TagRecon, a fine-grained multi-object 3D reconstruction scheme utilizing well-deployed RFIDs. Specifically, TagRecon transforms the task of reconstruction into a problem of estimating 3D bounding boxes for tagged packages. By placing dual anchor tags on each target package, TagRecon enables accurate inference of the package's translation and rotation using RFID-based localization and orientation sensing. Our scheme introduces a novel method to estimate rotations and translations for tagged packages, utilizing the known geometric relationship of anchor tags. Besides, to achieve simultaneous reconstruction of multiple packages, we manage to match tags from various packages through the correlation between anchor tag pairs. As far as we know, this is the first RFID-based solution that can simultaneously realize 3D translation and rotation estimation of multiple objects to a fine granularity. Experiments validate TagRecon achieves a 28.0 cm translation error and 6.8 degrees, 6.0 degrees, and 7.5 degrees rotation errors for roll, pitch, and yaw angles on average.