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关键词： RFID   13.56 MHZ天线   平面螺旋电感   天线仿真   矢量网络分析仪  

摘要： 为了使13.56 MHz射频识别天线适合于智能钥匙柜应用中,对13.56 MHz PCB天线的工作原理、作用机理进行了简单的介绍,然后对应用于智能钥匙柜的13.56 MHz平面螺旋电感天线进行了理论分析计算、CST三维电磁场仿真、匹配电路仿真,最后通过矢量网络分析仪对设计的13.56 MHz射频天线进行测试,测试结果表明设计的13.56 MHz天线达到了设计的要求,能够用于智能钥匙柜识别天线中。

关键词： RFID技术   图书馆自动化系统   应用  

摘要： 文章根据RFID技术在图书馆的应用现状,分析了在图书馆使用中出现的问题,结合图书馆自动化系统的实际,探讨了图书馆自动化系统应根据RFID技术在图书馆的应用场景,相应拓展功能,拓宽自动化系统在图书馆管理中局限于内部管理的问题。

关键词： 定位矿灯标识卡   多模信息   RFID   ZigBee   过压过流自诊断  

摘要： 设计一种低功耗多模定位矿灯标识卡,标识卡具有过压、过流自诊断及保护功能,保证矿灯正常使用时间。将RFID、ZigBee技术采用单芯片集成控制设计,可以实现由区域向精确定位无缝升级,通过HFSS仿真软件对微带天线优化,增加射频功率放大器,提高ZigBee精确定位测距准确性和通信距离,并通过实际测试优化设计,最终满足现场实际应用。

关键词： 射频识别   定位系统   CAN总线   MSP430芯片  

摘要： 基于日益突出的煤矿开采安全问题,设计研究了煤矿井下人员定位系统,系统总体上可以划分成为两大部分,分别为井上部分和井下部分。井上部分主要为集中监控中心,井下部分主要为标签和基站。基站和标签的主控芯片全部选用的是MSP430系列芯片,射频芯片全部选用的是CC1100型号芯片。当基站信号覆盖范围内发现有携带标签进入的工作人员时,可以对标签信息进行读取并利用CAN总线传输至地面集中监控中心,进而确定井下人员的精确位置。人员定位系统的实践应用对于提升煤矿安全具有重要的实践意义。

关键词： Smart transportation systems   RFID   Internet of things   IoT   Vehicle tracking   GSM   GPRS   GPS  

摘要： The growing concerns of families about the safety and security of their children prompted a major interest in developing robust systems that offer efficient tracking and monitoring of children commuting between homes and schools. With the emergence of the Internet of Things (IoT) technology, in addition to Radio Frequency Identification (RFID), developing such systems became feasible and cost-effective. In this paper, we present the design and implementation of a comprehensive low-cost system based on IoT that allows schools, parents, and authorities to track the movement of children while in school buses or being transported in private vehicles in real time. The system is based on off-the-shelf passive RFID readers that are installed within buses, next to bus stations, and pick-up points at school entrances. We have implemented the system as an application connected to a MySQL database deployed over the Heroku's versatile cloud platform. The different stakeholders (parents and school administrators) connect to the system through the Internet using a secure Java GUI. The parents can track their children along the bus route in real time. The system is built to integrate children monitoring within the buses, the tracking of the buses, and the tracking of private vehicles transporting children to/from school. The developed system provides additional security features such as access to safety records of bus/vehicle drivers and infringements. A variety of reports for different activities of buses and vehicles can be generated in real time at the school level. The system was tested successfully over the King Fahd University of Petroleum and Minerals large campus which includes several schools (kindergarten, primary, and secondary).

关键词： RFID tags   Encoding   Printing   Radio frequency   Technological innovation   Fabrication   Chipless RFID   Conductive Bridging Random Access Memory (CBRAM)   electronically rewritable chipless RFID   metal–   insulator–   metal (MIM) switches   printing   rewritable chipless RFID   thermal transfer printing  

摘要： We present an electronically rewritable chipless RFID tag based on integrated nonvolatile Conductive Bridging Random Access Memory (CBRAM) RF switches. CBRAM is a nonvolatile memory technology, which is identified as an innovative RF switching solution in this decade. Reconfigurable resonator or RF encoding particle (REP) used in this tag is a closed-loop resonator integrated with two switches each to tune its electrical length, and encodes three states each, to represent more than one bit per REP. Presented tag is composed of three such REPs to represent a total of 27 unique states. This chipless RFID tag with CBRAM switches could be written/rewritten electronically using DC voltage pulses, to encode a desired code from a given combination. Thermal impression transfer printing is utilized for printing metallic layers of the presented chipless tag. Complete fabrication steps of presented tag with integrated CBRAM switches are carried out without any "clean room" processes. An insight to working mechanism of presented rewritable REPs using electrical models is included in this article. Proof of concept of a potential hybrid data encoding technique combining frequency shift coding and Radar Cross Section (RCS) magnitude level coding, through experimental studies, for presented REPs, is also given herewith.

关键词： Computational RFID   Downlink data transmission   Multicast dissemination   Link characteristic aware  

摘要： Computational radio frequency identification can be successfully employed in a range of applications. The efficient data dissemination is a building block for useful functions such as parameter configuration, code debug fixing, and wireless reprogramming. Many recent data dissemination protocols have adopted transmission methods from a reader to a single tag following EPC C1G2. Even if the same data need to be transmitted to multiple tags, they can only be distributed individually;however, tags in the reader antenna coverage area can hear commands from the reader, which motivates us to pursue a multicast data dissemination scheme that is compatible with the existing protocol. In this paper, we propose Lama, an efficient multicast data dissemination protocol that considers tag link characteristics (link quality and charging efficiency). This method improves the efficiency of data dissemination by selecting an appropriate master tag. Experiments based on a commercial reader demonstrate that Lama reduces the dissemination delay compared with state-of-the-art protocols.

关键词： circularly-polarized   coupled-line power divider   inverted F antenna   RF identification   wideband  

摘要： A compact wideband circularly-polarized (CP) RF identification (RFID) handheld reader antenna based on inverted-F antennas (IFAs) is proposed. The antenna consists of an upper layer of rotationally symmetric radiation structure and lower layer of feed network. Firstly, the feed network is verified by microwave circuit simulation software. Then the antenna is modeled and simulated with the aid of the full-wave electromagnetic simulation software. Finally, a prototype is fabricated using FR4 plate and its performance of the proposed antenna is validated. The measured impedance bandwidth of 10 dB and the axial ratio (AR) bandwidth of 3 dB are wider than 13%. The peak gain is greater than 2.2 dBic, and the minimum AR is less than 1.1 dB, with the symmetrical and stable radiation patterns. The antenna has the compact size of 60 x 60 x 15 mm(3). The proposed antenna can not only meet the requirements of RFID handheld reader applications in universal ultra-high frequency (UHF) band (840-960 MHz), but also has the advantages of wideband, small size, lightweight, low cost, and simple structure. Therefore, the design has a good application prospect in the field of Internet of Things.

关键词： Lightweight protocol   Mutual authentication   Key disclosure   Distance fraud   LPN   Distance bounding   RFID  

摘要： RFID tags are one of the main enablers of the internet of things. All objects have to be equipped with an electronic product code such as RFID tags. Because of minimizing the price, RFID environments are resource-scarce, then designing ultra-lightweight authentication protocols is of great importance. Many ultra-lightweight authentication protocols such as HB family protocols are proposed. One of the most important threats against HB family protocols is a type of man-in-the-middle attack called GRS. Also, in the real world, IoT requires mutual authentication that traditional HB protocols do not support it. Besides, misconceptions about reader-tag distance could create problems in several applications especially in contactless systems such as access control and electronic payment systems, which could be damaged by distance-based frauds. In the present work, we have proposed a novel distance bounding protocol based on HB family protocols with four major characteristics: (1) it can resist terrorist, mafia, and distance fraud attacks;(2) it is a lightweight mutual authentication protocol capable of being used in low-cost IoT equipment such as NFC and RFID;(3) it employs a hard problem that be post-quantum resistant, and (4) it identifies and solves the weaknesses of HB protocols including GRS attacks. The proposed protocol has also been shown to be able to address the known weaknesses and attacks in distance frauds and HB family protocols.

关键词： Vehicular cloud computing   Authentication   Elliptic curve based cryptography   Security analysis   Tag/reader impersonation   Distance bounding attacks  

摘要： RSEAP is a recently proposed RFID based authentication protocol for vehicular cloud computing whose authors claimed to be secure and efficient. In this article, we challenge these claims. More precisely, we show that RSEAP does not provide the desired security, and it is possible to conduct both tag and reader impersonation attacks efficiently. Besides, despite the use of timestamps, we show how this protocol also suffers from a range of relay attacks. The complexity of any of the proposed attacks is negligible while the success probability is maximum (i.e., the adversary's success probability is '1' since all the proposed attacks are deterministic). To improve the security of RSEAP scheme, we suggest the required patches for fixing the security vulnerabilities mentioned above. We show that the improved protocol, called RSEAP2, is more efficient (computation and communication costs) than the original RSEAP, while provides a higher security level. The security of RSEAP2 is evaluated informally and also formally using the Scyther tool, which is a well-known and automated tool to assess the security of cryptographic protocols. Additionally, we have formally verified the security of the proposed scheme under the Real-or-Random oracle model. (C) 2020 Elsevier Inc. All rights reserved.