• Journal of the Institute of Electronics Engineers of Korea TC
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• v.41 no.8
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• pp.79-85
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• 2004

In this paper, the RF-ID system for ubiquitous tagging applications has been designed, fabricated and analysed. The RF-ID System consists of passive RF-ID Tag and Reader. The passive RF-ID tag consists of rectifier using zero-bias schottky diode which converts RF power into DC power, ID chip, ASK modulator using bipolar transistor and slot loop antenna. We suggest an ASK undulation method using a bipolar transistor to compensate the disadvantage of the conventional PIN diode, which needs large current Also, the slot loop antenna with wider bandwidth than that of the conventional patch antenna is suggested The RF-ID reader consist of patch array antenna, Tx/Rx part and ASK demodulator. We have designed the RF-ID System using EM and circuit simulation tools. According to the measured results, The power level of modulation signal at 1 m from passive RF-ID Tag is -46.76 dBm and frequency of it is 57.2 KHz. The transmitting power of RF-ID reader was 500 mW

• Proceedings of the KIEE Conference
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• 1999.07g
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• pp.3256-3258
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• 1999

Recently contactless ID system has emerged as new ID industry. It's called RF-ID. RF-ID is divided into active RF-ID and passive RF-ID. The passive RF-ID operates without battery and so has no limitation in its operating range and life time. But it needs the RF-OC conversion circuit. It also can be applied to batteryless sensor for many application. This paper presents the study of the RF-OC conversion circuit for batteryless system in high frequency and confirms it by simulation and experiment.

• Proceedings of the KIEE Conference
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• 2000.07d
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• pp.3103-3105
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• 2000

본 논문은 RF/ID 카드를 이용한 도어락 시스템의 개발에 관한 것이다. 기존 기계적 도어락 시스템의 보안과 편리성을 도모하기 위해 전자식 도어락가 현재 널리 쓰이고 있다. 대부분의 도어락 시스템이 버튼식이지만 현재 RF/ID 카드를 많이 쓰는 추세이다. RF/ID카드는 비접촉식으로 보안성과 그 신뢰성이 뛰어나며 안테나 설계와 Tag의 특성에 따라서 그 통신 범위도 작게는 몇Cm에서 크게는 몇십m 까지 된다. 따라서 그 응용 범위 또한 광범위해서 사람. 개체. 물류등의 개체인식에 널리 쓰이고 있다. 본 논문은 이러한 RF/ID 카드를 소규모 도어락 시스템을 요구하는 가정, 또는 오피스텔과 같은 곳에서 쓰일 수 있는 도어락 시스템을 개발하였다.

• Proceedings of the KIEE Conference
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• 2003.07b
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• pp.1306-1308
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• 2003

RF-ID technic will got over not only damage which can be caused by contact ID technic but also worse awareness with the lapse of time. In advance, for subway the fares of mass transportation at rush hours of the days, it's important to find a way to collect fares without unnecessarily delaying passengers. In this paper. we are proposing RF-ID system using the RF Communication Technic and Energy Transformation Technic.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.539-542
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• 2005

In this paper, we propose a wireless data access system, which used direct sequence spread spectrum method and the ISM band with 900MHz radio frequency. By applying bi-directional transmission between wireless transmitter and receiver, it can be effectively connected with any kinds of RF-ID with 900MHz ISM band. Therefore it could economically be used as peripheral equipments for RF-ID system.

• Proceedings of the KIEE Conference
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• summer
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• pp.1263-1265
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• 2004

RF-ID system is one of the very interesting field not only in a technical and economical point of view but also that people are still trying to realize lossless power transmission. This paper has a purpose on the efficient power transmission at the passive type IDcard by using wireless power transmission system. The most difficult but important part of the passive type RF-ID system is building the system that supplies power from Reader-antenna to IDcard-antenna. To check what is the most efficient way to deliver power depending on what kind of specifications of the power-amp in reader, antenna and antenna in IDcard is for operating IDcard circuit efficiently receiving the power from reader-antenna. For this, we used 125kHz sinewave for RF signal as a basic specification, OP-amp for amplifying signal and power-amp for amplifying power, loop type antenna.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.6
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• pp.1224-1230
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• 2006

ID registered in RFID tag is written as a binary or code form and interpreted by RF reader. It must be changed to FQDN structure for the internet service. FQDN(Fully Qualified Domain Name) form also must be resolved during the several steps in the application service networks. In this paper, we studied the technical issues and proposed the resolution mechanism fur the sample ID system. As a sample ID, we applied ISBN to RFID system.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2004.05b
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• pp.41-44
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• 2004

A RFID(Radio Frequency IDentification) system Is a kind of Radio Frequency Communication System and a branch of Automatic Data Collection System. The RFID System is composed of RF Tag(or Transponder) and RFID Reader(controller). This paper deal with Wireless communications that acquired RF Tag ID by RFID reader, and then target system will transmit Tag ID to RFID Server through the internet using Wireless LAN. The RFID system of Todays are commonly used by a wired RFID system. In this system uses commonly used Wireless LAN, and then we can connect the internet if we have a AP(Wireless Lan Access Point). Internet connection can make a transmission of RF Tag ID, and can make a reception of returning data that are images or information.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.10a
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• pp.626-629
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• 2003

In this paper, a system that implementation of Biometric System Using RF-ID. We organize a certification system which the security is strengthened, the information is flowed out and the presentation will do the possibility not to be abused. The loss of the credit card and problems which there is many of forgery back are happening. To solve such problems, We organized the system to use after we stored a fingerprint data at RF Card and going through certification necessary formalities. Various research to be related uses this system and is predicted. The development to common use goods will be possible through a certification procedure.

• Proceedings of the KIEE Conference
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• 2003.04a
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• pp.402-404
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• 2003

Radio frequency identification (RF-ID) is an automatic data capture (ADC) technology that comprises small data-carrying device(is called Tag) and fixed or mobile device(is called reader). Tags are attached or deattached device. Readers may be installed at locations where data capture is required, and may also be in the form of portable readers. In this paper, we are proposing an application for the subway station using the RF-ID system and a system for the gateless fare collection passing through the booth in only carrying the card. In this system that RF-ID system and Bluetooth are applied. We designed two wireless communication channels. One is the 125kHz communication channel by FSK and PSK for power supplying on the card and identification and the other is 2.4GHz channel for the collection.