IC Tag Research Articles

Optimization of Meander Line Antenna Considering Coupling Between Nonlinear Circuit and Electromagnetic Waves for UHF-Band RFID

This paper presents optimization of meander line antennas (MLA) for passive IC tags which contain nonlinear circuits. In the present analysis, the tag antenna loaded by the Cockcroft-Walton circuit is analyzed by solving coupling equations for electromagnetic waves and nonlinear circuit with FDTD method. The antenna shape is optimized so that the output voltage of the Cockcroft-Walton circuit is maximized using the micro genetic algorithm (μ GA) . The computational burden in the optimization processes is effectively suppressed by truncating the transient computations. A criterion is introduced to evaluate the errors caused by the truncation. The present method yields the optimal MLA which has the greater output voltage in comparison with the dipole antenna.

Development of a Mobile Robot Control System Using IC Tags

This paper provides a mobile robot control system using IC tags. We developed a mobile robot control system that is composed of an omni-wheel typed mobile robot, IC tags and a PC. The IC tag is very useful sensor for navigation of robot. This mobile robot moves according to the motion data from the IC tags. The effectiveness of our system is demonstrated by several experimental results.

IC-TAG ASSISTED QUALITY CONTROL SYSTEM FOR THE CONSTRUCTION WORKS OF STEEL STRUCTURES

The IC tags assisted inspection, information recording and tracing system was developed. In the system the IC tags were used as to give permission for conducting inspection and to give codes to receive and record information. The practicality of the system was verified on the construction site of the steel structure. The system worked well as to assist the inspection works but it required a certain amount of extra pre-works such as database preparation and IC-tags installation to the steel members. The system also required additional time in conducting the inspection works compared to the conventional inspecting methods.

2P1-E04 ICタグ環境を利用した移動ロボットの誘導と制御 : ICタグ読み取り率の改善(ユニバーサルデザイン&ロボット・セラピー)

2P1-E04 ICタグ環境を利用した移動ロボットの誘導と制御 : ICタグ読み取り率の改善(ユニバーサルデザイン&ロボット・セラピー)

Discussion on the Forward–Backward Configuration Effect of Reader Antennas in a Floor-Installed RFID System

A significant discussion is provided on the configuration of reader antennas (RAs) affecting a robot's positioning performance in a floor-installed RFID infrastructure for two-wheeled robots. RFID systems where IC tags are installed under/on floors have been widely utilized for positioning infrastructures. The RAs should be properly placed on a robot so that such an environment can give full play to its potential capabilities of positioning the robot. This problem calls for guidelines in designing the configuration of RAs. Our previous simulation study extracted an effect involving RA configuration in front of and behind the robot's moving direction (the forward–backward configuration effect), which can be a critical parameter for positioning accuracy, while it lacked a full investigation of the cause of the effect. This paper not only discusses an extraction of the effect, but also presents a detailed discussion on how it occurs through data analysis, a mathematically schematic proof and a control experiment for validation. Our discussions are widely applicable to localization methods using landmarks on/under the floor because our model assumes a simple and general detecting condition.

A study on the application and counter measures of IC tag in international marine container transport

A study on the application and counter measures of IC tag in international marine container transport

1A1-C30 ICタグ環境を利用した移動ロボットの誘導と制御

1A1-C30 ICタグ環境を利用した移動ロボットの誘導と制御

ＳＩＲ／ＭＣＭＣパーティクルフィルタを用いた分散カメラとレーザによる複数移動体の同時追跡

We are conducting the research project named Robot Town Project. The aim of this research is to develop a distributed sensor system such as cameras, laser range finders, and IC tags, and its management system so that autonomous robots can work with humans in an ordinary environment for daily human life. This paper presents a sensor network system consisting of distributed cameras and laser range finders for multiple objects tracking. Sensory information from cameras is processed by the Level Set Method in real time and integrated with range data obtained by laser range finders in a probabilistic manner using novel SIR/MCMC combined particle filters. Though the conventional SIR particle filter is a popular technique for object tracking, it has been pointed out that there are some drawbacks in practical applications such as its low tracking performance for multiple targets due to the degeneracy problem. In this paper, the new combined particle filters consisting of a low-resolution MCMC particle filter and a high-resolution SIR particle filter is proposed. Simultaneous tracking experiments for multiple moving targets are successfully carried out and it is verified that the combined particle filters has higher performance than the conventional particle filters in terms of the number of particles, the processing speed, and the tracking performance for multiple targets.

1A1-B05 ナスを対象とした移動型選果ロボットの開発 : ICタグを用いた株の識別実験

In the progress of precision farming, it is very important to collect variety of information on crops and field. In this study, we developed a prototype mobile eggplant grading robot in order to get information that be used for presentation of better way on cultivation. This robot can collect and accumulate the fruit's features information and location information at the same time while harvesting. After the field test experiment, a prototype mobile eggplant grading robot has achieved its purpose which was acquiring and storing information in real time and has created field spatial maps from the information. In the previous experiments, a rotary encoder was used in order to discriminate plant location based on the distance from the start point of the robot. However, the detecting error of the distance increased in proportion to the travelling distance of the robot because of the slip of the rotary encoder. In this paper, the robot discriminated plants by using IC tags attached to individual plants and a transmitter-receiver mounted on the robot. From the results, the robot could discriminate individual plants correctly.

A study on the applications of IC tag(RFID) for security and visibility in international container transportation

A study on the applications of IC tag(RFID) for security and visibility in international container transportation

Autonomous Mobile Robot Navigation Using Passive RFID in Indoor Environment

This paper proposes an efficient method for localization and pose estimation for mobile robot navigation using passive radio-frequency identification (RFID). We assume that the robot is able to identify IC tags and measure the robot's pose based on the relation between the previous and current location according to the IC tags. However, there arises the problem of uncertainty of location due to the nature of the antenna and IC tags. In other words, an error is always present which is relative to the sensing area of the antenna. Many researches have used external sensors in order to reduce the location errors, with few researches presented involving purely RFID driven systems. Our proposed algorithm that uses only passive RFID is able to estimate the robot's location and orientation more precisely by using trigonometric functions and the IC tags' Cartesian coordinates in a regular gridlike pattern. The experimental results show that the proposed method effectively estimates both the location and the pose of a mobile robot during navigation.

Composition and Characteristics of High-Permeability Composite Sheet Materials Used for IC Tags Mounted on Metallic Bodies

Requirements for the use of IC tags on metallic objects have increased recently as systems that use IC tags have become widely adopted. We have proposed and designed a structure for an IC tag that operates on metallic objects. The structure of the IC tag consists of a conductive metal sheet at the bottom and a thin magnetic core made of a high-permeability composite sheet, which is inserted between the receiver coil and the metal sheet. With this structure, magnetic coupling between the antenna coil and the receiver coil is enhanced; furthermore, the influence of the metallic body to which an IC tag is attached is well suppressed. The method used to fabricate magnetic powders for the composite sheet is investigated together with the effect of the rolling process used to make a sheet on the magnetic anisotropy induced in the sheet. The permeability and quality factor are characterized for five samples in the frequency range from 10 MHz to 1000 MHz. The best fabrication method for magnetic composite sheets is to use 0.8∼1 μm size Co powders as magnetic powder material to be mixed with a resin at the weight ratio between 70 w% and 86 w%, and to apply rolling after extrusion or pulling out after extrusion for a making sheet.

Fabrication and Operating Range of Metal-Compatible IC Tag with Flat Solenoid Coil

A metal-compatible IC tag that operates on metal objects is presented. It consists of an antenna coil with a thin magnetic sheet core and a bottom conductive sheet to isolate the antenna coil from the electromagnetic influence of the metal object to which the tag is attached. The direction of communication to/from a reader/writer is in the plane of the sheet core and parallel to the axis of the solenoidal antenna coil. Magnetic sheet core materials were developed and tested for 125-kHz and 13.56-MHz IC tags. The experimental results revealed that the operating range remained unchanged for the 13.56-MHz IC tag and that it was reduced by 15% for the 125-kHz tag when the tags were directly placed on a 3-mm-thick iron plate.

1A2-M14 埋設ICタグに対する自動書込みロボットの開発

We propose a procedure to construct the environment burying IC tags for indoor navigation system. It is necessary for the environmental construction to put IC tags to constant distance and to write in information. Therefore, constructors spend much labor. We solve the problem by an automatic writing robot with omni-directional wheels and a PSoC. We checked the workings of the robot by easy experiments.

Coupling of Transmitting/Receiving Antennas and Super Regenerative Transponder (SRGT) for RFID Tags

We propose the system of wireless IC tag that is fed with electromagnetic wave power and communicates with very weak radio wave. In this paper, we study the coupling the transmitting/receiving antennas with Super Regenerative circuit. Receiver sensitivity and transmitting electromagnetic fleld strength are clarifled.

Current-Reuse Type LC Oscillator with High-Speed Start-Up for Active IC Tags

Current-Reuse Type LC Oscillator with High-Speed Start-Up for Active IC Tags

Implementation of a JXTA‐based P2P e‐learning system and its performance evaluation

PurposeThis work is motivated by the need to develop decentralized peer‐to‐peer (P2P) approaches to support e‐learning and teaching activity in virtual universities. This paper aims to present the implementation of the JXTA‐based e‐learning P2P system.Design/methodology/approachThe design and implementation of a smart box environment that will be used for stimulating the learners to increase the learning efficiency is shown. The smart box is integrated with the JXTA‐overlay by using efficient message sending between peers in the system.FindingsThe proposed e‐learning P2P system is a useful tool for monitoring and controlling learners' activity.Research limitations/implicationsIn the future, other effective stimulation for each learner using IC tag card will be added. Also, the Servo Motor has 12 control ports, so these will be used for implementing other stimulating functions. It is planned to extend the system with functionalities for presence mechanism of students in classrooms and activities.Practical implicationsThe proposed system is evaluated by experimental results and it has a good performance.Originality/valueThis paper proposes and implements a novel e‐learning system, which is based on P2P, web and sensor technologies.

Design and Experiments of a Novel Low-Ripple Cockcroft-Walton AC-to-DC Converter for a Coil-Coupled Passive RFID Tag

A low-ripple diode charge-pump type AC-DC converter based on the Cockcroft-Walton diode multiplier is proposed for coil-coupled passive IC tags in this paper. This circuit is developed as a power supply for passive RFID tags with smart functions such as heart rate detection and/or body temperature measurement. The proposed circuit converts wirelessly induced power to a low-ripple DC voltage suitable for a 13.56 MHz RFID tag. The proposed circuit topology and the principle of operation are explained and treated theoretically by using quasi-equivalent small-signal models. The proposed circuit was implemented on a PCB. And it was confirmed that the proposed circuit provides 3.3 V DC with a ripple of less than 20 mV when a 4Vp-p sinusoidal input is applied. Under this condition, the maximum output power is about 310 μW. The measured results were in good agreement with theoretical and HSPICE simulation results.

UHF 帯RFID を用いた屋内歩行者の通過検知のための基礎的研究

Whereabouts confirmation in the outdoor has become easy by GPS, but it is difficult to use in the room where GPS electric waves do not reach. To confirm whereabouts in the room, the authors are examining the detection system with IC tag. In this research, the position of the antenna and the IC tag was examined to detect the person equiped with IC tag when he is standing, sitting and moving. From the result of the experiment with passive UHF IC tag, it was shown that the detection range was 100cm ups and downs from the antenna, alsoit was understood that the detection probability rises most when installing IC tag in lower limbs.

3506 ICタグのロギング機能に関する研究(S52 生産システムの新展開(環境負荷低減),21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

This paper describes the logging function for the active IC tags in case of data logging. The IC tags that have sensors, processors, memories, etc. are being expected to be used in the various scene. In case of data logging with the active IC tags, it is necessary to control limited amount of their memories cleverly in order to keep important data. Thus the logging function in this research consists of the function of obtaining data by IC tags and of forgetting the log entries. "Forgetting Algorithms" give importance to the characteristic data within the IC tags' memories cleverly in order to forget the log entries. Eventually, we will evaluate the results with the simulation experimentation.