Application of Radio Frequency Identification (RFID) in Dairy Information Management

As a kind of brand-new technology, radio frequency identification management, data control and acquisition. This paper introduced food safety system construction, analyzed the advantages and problems in dairy modem suggestions for solution according to the practical situation. （RFID） plays an important role in dairy information tracing and culture function extension of managing breeding technology, and finally put forward some

A Modified Split⁃Ring Resonator Antenna for Radio Frequency Identification Tag

A compact antenna formed by three concentric split rings for ultra-high frequency(UHF)radio frequency identification(RFID)tag is proposed in this paper.The antenna is composed of two parts,an outer short-circuited ring modified from a traditional split-ring resonator(SRR)antenna and an inner SRR load,so the antenna can be regarded as a short-circuited ring loaded with SRR.According to the transmission line theory,to conjugate match with the capacitive input-impedance of a tag chip,the length of the short-circuited ring isλg/4 shorter than that of an open-circuited dipole of a traditional SRR antenna,whereλg is the wavelengh of the operating frequency.Hence,the size of the proposed antenna is more compact than that of the traditional SRR antenna.Thereafter,the proposed antenna is simulated and optimized by ANSYS high-frequency structure simulator(HFSS).The impedance,efficiency,and mutual coupling of the fabricated antenna are tested in a reverberation chamber(RC).The results show that the size of the presented antenna is 83%smaller than that of the traditional SRR antenna and the proposed antenna can cover the whole UHF RFID operating frequency band worldwide(840—960 MHz).The measured read range of the tag exhibits maximum values of 45 cm in free space and 37 cm under dense tag environment.

Remanufacturing Closed-Loop Supply Chain Model with Radio Frequency Identification Affecting Recycling Rate

In order to construct a resource-saving and environment- friendly society, the advantages of radio frequency identification （RFID） were considered. And it put forward the idea of introducing RFID in the recycling activities of waste products. Taking into account such elements as the technical level of RFID, cost saving from remanufacturing and the cost of RFID tags, both centralized and decentralized supply chain models with different participants in waste product collection were created, in order to determine the optimal pricing strategy and RFID technical level. In the end, sensitivity analyses were conducted to analyze the impacts of scaling parameter for additional increased recovery rate with RFED on pricing and RFID technology level, and impacts of cost saving on the profits of participants in different remanufacturing closed-loop supply chain models.

Recovery of Collided RFID Tags With Frequency Drift on Physical Layer

In a passive ultra-high frequency(UHF)radio frequency identification(RFID)system,the recovery of collided tag signals on a physical layer can enhance identification efficiency.However,frequency drift is very common in UHF RFID systems,and will have an influence on the recovery on the physical layer.To address the problem of recovery with the frequency drift,this paper adopts a radial basis function(RBF)network to separate the collision signals,and decode the signals via FM0 to recovery collided RFID tags.Numerical results show that the method in this paper has better performance of symbol error rate(SER)and separation efficiency compared to conventional methods when frequency drift occurs.

Design and Implementation of a Low-Power Active RFID for Container Tracking at 2.4 GHz Frequency

In this paper a new active RFID system at 2.45 GHz based on the low-power system-on-chip CC2530 RF transceiver is designed and implemented. Only by using of an integrated multi-channel fast chip, both the MCU and RF operations are done which makes the RFID more reliable and reduces the complexity of the hardware and cost, vividly. This RFID system utilizes the Zig-Bee IEEE 802.15.4 standard in the ISM band. A lot amount of energy is restored by setting Tags in the sleep mode in the most of times. The maximum transmission range of 80 m at the output power of 4.5 dBm is obtained. The main application of this system is for the container identification with precise operation and high accuracy. An active Tag with unique ID is mounted on each vehicle. By enabling the AUTOCRC error detection possibility, minor errors are detected in the received frames. Receiver sensitivity of –97 dBm and current consumption of 1 μA in the sleep mode and 29.6 mA in the active mode are reported.

Design and simulation of self-powered radio frequency identification (RFID) tags for mobile temperature monitoring

This paper presents a design for a self-powered radio frequency identification (RFID) tag with a thin film bulk acoustic reso- nating piezoelectric power supply (PPS), which can be used for portable remote temperature monitoring. We call this system a PPS-RFID for short. The RFID systems have been found to have many applications in the internet of things (IOT) in the past decade. But semi-active RFID tags require an onboard battery which limits their applications in many fields. For these reasons, our research focuses on power sources for the RFID tags. This paper emphasizes the circuit design and simulation of PPS. In our tests, 0.283 mW was generated by PPS at 1 Hz vibration by a 650 N impact force. The results showed that the integrated PPS could supply sufficient power for the designed PPS-RFID tag. The PPS-RFID tag can be widely used for temperature monitoring during mobile transport of perishable items such as medicines or food.

Capture-aware Bayesian RFID Tag Estimate for Large-scale Identification

Dynamic framed slotted Aloha algorithm is one of popular passive radio frequency identification(RFID) tag anticollision algorithms. In the algorithm, a frame length requires dynamical adjustment to achieve higher identification efficiency.Generally, the adjustment of the frame length is not only related to the number of tags, but also to the occurrence probability of capture effect. Existing algorithms could estimate both the number of tags and the probability of capture effect. Under large-scale RFID tag identification, however, the number of tags would be much larger than an initial frame length. In this scenario, the existing algorithm's estimation errors would substantially increase. In this paper, we propose a novel algorithm called capture-aware Bayesian estimate, which adopts Bayesian rules to accurately estimate the number and the probability simultaneously. From numerical results, the proposed algorithm adapts well to the large-scale RFID tag identification. It has lower estimation errors than the existing algorithms. Further,the identification efficiency from the proposed estimate is also higher than the existing algorithms.

Bi-slotted Binary Tree Algorithm with Stack for Radio Frequency Identification Tag Anti-Collision

A radio frequency identification (RFID) reader will fail to identify tags if a collision occurs. This paper proposes a bi-slotted binary tree algorithm (BSBTA) with stack for RFID tag anti-collision to improve the performance of binary tree algorithm (BTA). In BSBTA, the reader detects collisions by Manchester code and stores colliding prefixes in a stack. The query is composed of a two-bit prefix and an index value. Following every reader query, there are two timeslots for tags whose pointers and identities (IDs) match the query to respond, one for the tag whose next bit is 0 and the other for the tag with 1 as its next bit. Performance analysis and evaluation are also given. The time complexity and the communication complexity of BTA and BSBTA are derived. The simulation results compare the performance of BSBTA with several related anti-collision algorithms. It is shown that BSBTA outperforms BTA in terms of the average number of responded bits and timeslots for one tag identification.

基于UHF RFID标签的农产品可追溯系统研究

农产品追溯包括生产、加工和流通3个环节。由于农产品产地分散、生产周期长,生产环节溯源成为农产品全过程可追溯的瓶颈。笔者提出了以超高频射频识别(UHFRFID)标签为农产品可追溯系统的记录载体,针对UHFRFID标签存储空间特点对产地、品种、生产日期和认证类型追溯信息进行编码,实现了农产品生产环节追溯信息无需网络和在线数据库支持的记录和读取。

一种用于UHF RFID标签的高稳定度时钟电路

设计了一种用于无源超高频射频识别标签芯片的时钟生成电路.在传统弛豫振荡器的基础上设置相位控制电容和相关校准电路,使输出时钟频率与工作电压和偏置电流不相关,抑制了电源的波动和偏差所引起的时钟抖动,保证了时钟频率的稳定性.同时,利用正负两种温度系数的电阻的温度补偿作用及相应的校准控制,实现了当温度在较大范围变化时时钟的周期稳定性.该电路在TSMC 0.18μm工艺下流片.测试结果显示,该方法可以获得更大的时钟校准范围和更高的输出时钟精度,电路功耗0.86μW,适合无源芯片的使用.

一种新型无源UHFRFID带隙基准电路

设计了一种适用于无源超高频射频识别芯片的电流模带隙基准电路,其中负温度系数电流利用BJT管的基射极电压的负温度特性产生,正温度系数电流利用偏置在亚阈值区的MOS器件其漏源电流与栅源电压呈指数关系的特性产生.该基准电路采用TSMC 0.18μm工艺库仿真并投片验证,基准电压的绝对值偏差最大不超过1.75%.测试结果表明,该电路功耗仅为0.65μW,最低工作电压为0.829V,温度系数为±63×10-6/℃,芯片有效面积为0.04mm2.该基准电路已成功应用于一款无源超高频射频识别芯片中,其读取灵敏度为-16dBm.

UHF RFID标签芯片整流电路设计

整流电路的设计是无源射频识别(RFID)标签的关键技术之一。首先讨论了超高频无源电子标签整流电路的基本工作原理,然后分析了整流电路的等效电路模型。基于TSMC0.18μmCMOS混合信号工艺设计了一种具有双输出的整流电路,并通过MPW项目流片验证。测试结果表明,该电路具有低输入电压,高整流效率的特点。

Integration of Radio-Frequency Identification and 4D CAD in Construction Management

In order to increase the productivity of construction industry, emerging technologies have been constantly introduced and applied in this traditional industry by pilot researchers. This paper provides an integrated model of radio-frequency identification (RFID) and four-dimensional Computer-Aided Design (4D CAD) in construction management. RFID involves the use of tags that collect data and transmit data. RFID can collect data by radio waves instead of light waves. RFID technology is surpassing barcode technology where light waves are easily blocked and barcode labels are easy to fall off or become unreadable due to dust, dirt, or other contaminants. 4D CAD which involves 3D construction models and construction schedules presents visualized construction process. Integration of RFID and 4D CAD in this paper built a dynamic construction management and control system which would reduce the time of capturing data on site and control quality of construction materials efficiently. Pilot test result shows that a construction manager can easily understand how and what a complicated construction project will be accomplished. Although further analysis is necessary, RFID and 4D CAD show promises of being a beneficial technology in construction management.

矿用UHF RFID阅读器分形天线的设计

传统的阅读器天线存在尺寸大、与标签之间的识别距离近等缺点,为此,采用分形理论和HFSS软件构建了新型的天线模型。具体实现方法是在天线辐射贴片的中心和四个角上开大小相同的方孔、地板上开四个槽,同轴馈电点设置在模型的对角线上。仿真结果表明,天线的各项指标均满足超高频频段的标准,实现了天线的小型化设计;识别距离达7.16 m,适用于煤矿井下人员定位系统。

低压低功耗无源UHF RFID标签芯片模拟前端电路的设计

本文从设计符合EPCTMC1G2协议的超高频无源射频识别标签芯片的角度出发,对RFID标签芯片模拟前端电路进行设计。通过对各个关键电路的功耗与电源进行优化,实现了一个符合协议要求的低电压、低功耗的超高频无源RFID标签芯片的模拟前端。该UHF RFID标签模拟前端设计采用SMIC 0.18μm EEPROM CMOS工艺库。仿真结果表明,标签芯片模拟前端的整体功耗控制在2.5μW以下,工作电源可低至1 V,更好地满足了超高频无源射频识别标签芯片应用需求。

一种小型UHF RFID抗金属标签天线的设计

针对射频识别标签天线小型化、抗金属环境的实际需求,提出了一种可应用于金属环境的超高频射频识别标签天线。通过在矩形贴片上开槽来实现小型化,天线总尺寸为56 mm×50 mm×1.6 mm。通过改变槽的尺寸调节标签天线的输入阻抗,结合等效电路图分析抗金属标签天线的设计过程,从而方便地实现与标签芯片的共轭匹配。实验结果表明,实测和仿真结果比较吻合,标签阻抗匹配良好,实测最大读取距离达3.1 m。与其他标签天线相比,该天线具有结构简单、成本低、易于实现和读取距离远等优势。

一类平面UHF RFID抗金属标签天线的设计

针对超高频(ultra-high frequency,UHF)射频识别(radio-frequency identification,RFID)标签天线在物流领域中的实际应用,设计一类可工作于金属表面的平面UHF RFID标签天线。此标签天线由辐射贴片、弯折开路短截线、介质基板和金属接地板组成,不需要短路墙或短路通孔将辐射贴片与接地板相连,更易于加工。与常用的直开路短截线结构相比,采用弯折开路短截线结构不仅可以对标签天线的阻抗进行更有效的调节,而且能够显著地减小辐射贴片的尺寸。利用曲流技术原理在辐射贴片上开槽,实现天线的小型化。仿真结果表明,此标签天线(尺寸为20 mm×80.5 mm×2 mm)阻抗匹配良好,而且将其置于20 cm×20 cm的金属表面上,实测得到其最大阅读距离可达到为9 m。与其他标签天线相比,此类天线具有阅读距离远、尺寸小、结构简单和成本低等优点,有潜在的实际应用前景。

基于手机OMAP5910内核的UHF RFID阅读器的设计与实现

RFID射频识别技术是一项非接触式自动识别技术。根据现代手机的射频系统覆盖频率已经达到900-2400MHz UHF频段、主流逻辑控制部分核心为中央处理器ARM925和数字信号处理器DSP C55X双核结构的开放多媒体处理平台OMAP5910,具有较强的控制能力和数据处理能力的特点。以此为基础,通过修改手机操作系统,在手机上实现了UHF频段RFID无源电子标签的阅读功能。实验表明,阅读距离可以达到至少10 cm,完全满足个人快速方便获取商品信息的需要,对于手机用户辨别真假商品具有实用价值。克服了传统RFID终端体积大不方便携带的缺点,扩展了手机功能,有利于促进电子标签这种新型技术取代条码的推广。

一种紧凑的UHF RFID抗金属标签天线的分析和设计

提出了一种可应用于金属环境的超高频射频识别标签天线。通过在圆盘贴片上开槽来实现小型化,天线总尺寸为76 mm×76 mm×3.2 mm。设计的天线采用单层结构的FR4基板,天线结构简单并不需要过孔及销钉。通过改变槽的尺寸可以有效地调节标签天线的输入阻抗,从而方便地实现与标签芯片的共轭匹配。实验结果表明:实测和仿真结果比较吻合,标签阻抗匹配良好,实测最大读取距离达6.8 m。与其他标签天线相比,该天线具有结构简单、成本低、易于实现和读取距离远等优势。

一种UHF频段弯折偶极子RFID天线的设计

针对目前射频识别（RFID）天线小型化要求,设计了一种超高频（UHF）弯折偶极子RFID标签天线。天线的构型采用了经典的电感耦合环匹配模型,结构简单且易实现阻抗匹配;在天线宽度上进行二次弯折降低长宽比例,具有小型化优势。利用HFSS仿真软件对该天线进行仿真分析,结果表明该天线具有较宽的阻抗带宽,能够覆盖920~925 MHz超高频频段,并且其回波损耗值及方向性均良好,能够满足RFID的实际生产和应用的要求。