超越条形码的理想选择——蓄势待发的RFID

RFID(射频识别)是一种非接触式、通过射频方式实现的数据识别技术。RFID标签有着不同的称谓，包括：射频芯片、IC芯片、IC标签或者非接触式标签。许多人认为，该技术特别适用于先进的自动识别系统。     

超越条形码的理想选择--蓄势待发的RFID

RFID(射频识别)是一种非接触式、通过射频方式实现的数据识别技术.RFID标签有着不同的称谓,包括:射频芯片、IC芯片、IC标签或者非接触式标签.     

超高频RFID标签芯片射频电路的分析与测试(英文)

提出了一种应用于超高频(Ultra high frequency,UHF)射频识别(Radio frequency identification,RFID)标签芯片的射频测试技术。针对UHF RFID标签芯片射频电路的特殊工作方式,该技术可对芯片的输入阻抗和灵敏度进行准确测量,并同时完成芯片功能验证。与传统的RFID标签芯片射频测试技术相比,文中的方案利用商用阅读器和可调衰减器代替了高端或RFID专用测试设备,因此极大降低了测试成本。利用该测试方案,对已开发的UHF RFID标签芯片进行了测试与验证,并利用测试结果完成了折叠偶极子天线设计以实现芯片与天线之间的阻抗匹配。将芯片与天线组装成无源标签,其灵敏度可达-10.5 dBm。实验结果证明了该方案的正确性。     

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EPCTM C1G2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 0.18 μm 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2.5 μW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.     

UHF RFID标签芯片模拟射频前端设计

对射频识别标签芯片系统结构及工作原理进行分析,设计应用于符合ISO18000—6C／B两种标准的UHFRFID标签芯片的模拟射频前端,主要包括整流电路、稳压电路、调制／解调电路、上电复位及时钟产生电路。模拟射频前端芯片采用TSMC0．18μm CMOS混合信号工艺流片验证。测试结果表明,所研制的模拟射频前端性能满足UHF RFID标签芯片系统要求。     

射频识别技术简介及其在健康体检管理系统中的应用

1射频识别技术简介射频识别即RFID(Radio Frequency IDentification)技术,又称电子标签、无线射频识别,是一种通信技术,可通过无线电讯号识别特定目标并读写相关数据,而无需识别系统与特定目标之间建立机械或光学接触。RFID是一种简单的无线系统,只有两个基本器件,标签和阅读器。标签(Tag):由耦合元件及芯片组成,每个标签具有唯一的电子编码,附着在物体上标识目标对象。阅读器(Reader):读取(还可以写入)标签信息的设备。     

一种无源RFID标签芯片的混合验证平台设计

无源RFID标签芯片需要通过电感耦合等方式从空间射频场中获取能量才能正常工作。因此在标签芯片设计、验证过程中必须构建一个射频天线测试模型来模拟其正常工作条件。针对一款13.56 MHz无源RFID标签芯片电路,充分利用射频天线测试模型,提出了一种应用于无源RFID标签芯片的数模混合验证平台设计。利用该平台可以完成芯片从前端到后端设计的验证,缩短RFID标签芯片的设计开发周期,提高设计的成功率。     

“物联网”推动RFID技术和通信网络的发展

"物联网"的概念推动着我国射频识别(RFID)技术和通信网络的发展,重点介绍的"组合识别"、"多样标签"和多功能读写器,将降低RFID系统的成本,加快RFID技术在"物联网"中的应用;RFID芯片、标签和系统的加密及安全措施,将满足RFID技术在军事和工业物流高端应用需求."物联网"需要建立庞大的通信网络和产品的数据库,需要开发生产各种传感器与通信终端的接口转换模块.     

一种13.56MHz无源射频识别模拟前端的设计

提出了一种基于ISO/IEC18000-3协议的高频13.56MHz射频识别(RFID)标签芯片的模拟前端电路结构,采用Chartered 0.35μm EEPROM工艺进行流片验证。该芯片实现了无源RFID标签芯片通信时所需的整流、稳压供电、时钟恢复、信号解调以及副载波调制的全部功能。     

一种有源RFID局域定位系统设计

提出了一种基于PIC16F877A微控制器和CC2500射频收发器芯片的低功耗、低成本RFID（Radio Frequency Identification,无线射频识别）局域定位系统设计方法,介绍了系统的定位工作原理、主要硬件电路模块及定位算法的设计和实现。采用基于序列号对时隙数运算的排序算法有效解决了多标签识别碰撞的问题,基于射频辐射强度（Received Signal Strength Indication,RSSI）和圆周定位算法实现了基于RFID多标签系统的平面定位。实验测试表明,这种射频定位方法能够实现一定精度下的无线局域定位的功能。     

射频识别芯片TMS3705在汽车智能防盗报警装置中的应用

介绍了以TMS3705为射频基站的射频识别系统 ,给出了其在汽车智能防盗装置中的应用工作原理、硬件组成 ,以及软件设计方法和软件流程 ;同时介绍了为提高识别可靠性而对TMS3705信息读取采用的16位循环冗余校验的具体算法。     

A 13.56-MHz RFID System Based on Organic Transponders

RFID tags based on organic transistors are described, discussing in detail the IC blocks used to build the logic and the radio. Tags energized and read out at 13.56 MHz, de facto standard frequency for item-level identification, have been tested and enabled for the first time multiple-object identification, using different 6-bit codes. A complete 64-bit transponder, the most complex organic RFID tag reported to date, operates at 125 kHz and employs 1938 transistors     

Remotely powered addressable UHF RFID integrated system

This paper presents a fully integrated remotely powered and addressable radio frequency identification (RFID) transponder working at 2.45 GHz. The achieved operating range at 4 W effective isotropically radiated power (EIRP) base-station transmit power is 12 m. The integrated circuit (IC) is implemented in a 0.5 /spl mu/m silicon-on-sapphire technology. A state-of-the-art rectifier design achieving 37% of global efficiency is embedded to supply energy to the transponder. The necessary input power to operate the transponder is about 2.7 /spl mu/W. Reader to transponder communication is obtained using on-off keying (OOK) modulation while transponder to reader communication is ensured using the amplitude shift keying (ASK) backscattering modulation technique. Inductive matching between the antenna and the transponder IC is used to further optimize the operating range.     

Curved RFID tags for metallic gas cylinders

Presented is a radio frequency identification (RFID) tag antenna designed to fit around the neck of a small gas cylinder and capable of operation at the European and American UHF RFID bands. The design is readable from all directions in the plane of the cylinder neck and is mounted on cheap synthetic rubber (neoprene) of thickness 2 mm with dimensions of 125 x 20 mm. The tag antenna was conjugally matched to the complex impedance of the transponder IC chip.     

A radio frequency identification implanted in a tooth can communicate with the outside world.

A radio frequency identification (RFID) transponder covering the 13.56 MHz band was adapted to minimize its volume so that it could be placed in the pulp chamber of an endodontically treated human tooth. The minimized transponder had a maximum communication distance of 30 mm. In an animal experiment, the transponder was fixed in the cavity of a mandibular canine of a dog. An RFID reader positioned close to the dog's face could communicate with the transponder in the dog's tooth. In certain cases, the system is applicable for the personal identification procedures for hospitalized patients instead of an identification wristband.     

一种新型的基于无源射频身份识别应答器的电源供给方案

提出了一种基于全集成的无源射频身份识别(RFID)应答器芯片的电源供给方案,并在特许半导体的0.35μm嵌入EEPROM的CMOS工艺线上流片成功.提出的AC/DC和DC/DC电荷泵能够为RFID的应答器芯片提供稳定的工作电压,同时具有极低的功耗和很高的充电效率.还给出了电压倍增器的分析模型、与其他电荷泵的升压原理的比较以及仿真结果和芯片测试结果.     

Phase-Encoded Chipless RFID Transponder for Large-Scale Low-Cost Applications

A novel 3 b chipless RFID transponder is presented. The transponder comprises three microstrip patch antennas, which are loaded with open circuited (O/C) high impedance stubs. The antennas are resonant at nearby frequencies, and when excited with their respective resonant frequency signals, they re-radiate backscattered signals with distinct phase characteristics. This phase information is encoded as hexadecimal bits for the proposed chipless RFID tag. Both the CST Microwave Studio full-wave solver and the anechoic chamber measurements show a 30$^{circ}$ phase step for the 3 b chipless RFID transponder. It it easily transferred to printed technology, and it may find applications in the mass identification market.      

RFID Transponder Collision Control Algorithm

Transponder collision problem can be significant when a large number of RFID (radio frequency identification) transponders exist in field. Most existing anti-collision algorithms can solve this problem. However, problem arises when all or part of these transponders are having identical UID (unique identification). This paper proposes a new transponder collision control algorithm to overcome overlapping that occurs among transponders with identical UID in RFID large scale deployment (e.g., in a large warehouse), so that the RFID reader can successfully identify the quantity of transponders for each particular UID with high identification accuracy. The proposed anti-collision algorithm adopts a modified version of frequency domain method by adding stochastic delays in time domain. The obtained results show that the proposed method can achieve optimum frequency bandwidth utilization and at the same time poses high identification accuracy (almost 100%) with low identification delay.     

Contactless radiation pattern measurement method for UHF RFID transponders

A contactless method of measuring the radiation pattern of a UHF RFID transponder is presented. The novel technique does not require any special transponder IC or measurement equipment. The measurement method also enables radiation pattern determination in the end-use application. The measurement setup and some example results are presented.     

一种NCITS 256协议超高频无源射频识别标签

设计了一种符合NCITS 256协议的无源超高频射频识别标签.标签携带2kbit的标准商用EEPROM.在读卡器发射功率为915MHz 4W EIRP的情况下,芯片的读距离为1.5m,写距离为0.3m.芯片在SMIC 0.18μm EEPROM CMOS工艺下流片实现,面积为1mm×1mm.标签使用Dickson倍压电路从读卡器发射的电磁波中提取能量.Dickson倍压电路使用肖特基管实现,转换效率为25%.