• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.7
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• pp.1301-1307
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• 2008

In this paper, we developed UHF RFID R/W system using AT91SAM7S256(ARM chip), UHF RFID R/W module (WJ7090) and wireless LAN(IEEE 802.11.a/b). And we developed a transmission/receiving packet which is send to UHF R/W module in AT91SAM7S256. In order to show the usefulness of UHF RFID R/W system, we executed a performance test. The developed UHF RFID R/W system shows better performance for reading of RFID tag and data transmission through wireless LAN.

• Journal of the Korean Society for information Management
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• v.26 no.3
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• pp.335-353
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• 2009

Since libraries first used RFID systems in the late 1990's, there is growing debate about the advantages and disadvantages of HF and UHF RFID systems. This study tries to explore practical issues in HF and UHF RFID systems especially in the areas of system characteristics and advantages and disadvantages affecting technology implementation to libraries. This study investigates the current status of RFID systems in Korean libraries, and analyzes the best practices of four libraries(two libraries in HF and two libraries in UHF respectively). Also, this study describes functional characteristics of HF and UHF RFID systems, debates on frequencies in ISO/DIS 28560, and the opinions of both manufacturers which provide RFID systems to libraries and librarians who use HF and UHF RFID systems in their libraries.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39C no.12
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• pp.1225-1229
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• 2014

This paper introduces a development of the auto sushi conveyer-belt payment system using UHF RFID dishes. In a sushi bar, instead of counting the number of the finished sushi dishes, sushi dishes with the UHF RFID have been used in the auto payment system to have accuracy and convenience. To recognize each dish, the UHF RFID tag has been designed, and auto-payment system has been developed. The UHF RFID tag under the dish has been recognized by an RFID reader, and the auto RFID payment system shows the total price of the finished dishes based on the color and number of dishes automatically. The performance of the developed UHF RFID tag and auto RFID payment system have been measured and verified.

• Information and Communications Magazine
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• v.24 no.8
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• pp.14-22
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• 2007

최근 UHF 대역에서 동작하는 RFID 시스템이 활발히 연구되고 있으며, 유통물류 분야를 시작으로 다양한 분야에서 활용되고 있다. 특히, 국내에서는 휴대폰과 RFID를 결합한 모바일 RFID 시스템을 도입하고 있으므로 가까운 미래에 RFID의 도입이 크게 확대될 것으로 기대되고 있다. 하지만 UHF RFID 시스템의 경우 Link Unbalance특성에 의해 주파수 간섭 등의 문제가 대두되어 전세계적으로 Dense 모드의 도입 및 기술기준 개정 움직임이 활발하게 진행되고 있다. 본 고에서는 UHF RFID 시스템에서 발생하는 주파수 간섭에 대해 알아보고, 국내외 UHF RFID Air Interface 기술의 최신 동향을 살펴보고자 한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.11
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• pp.2465-2472
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• 2009

This research paper is to develop remote data transmission terminal which is adequate to RFID R/W by using UHF/RF RFID R/W module (WJR7090) and Bluetooth communication(FB755AC) with ARM chipset(AT91SAM7S256). The developed UHF RFID R/W terminal performs tagging of RPID value and transmit the value to server with Bluetooth communication, the transmitted RFID tag value is compared to the Database value and the result is transmitted to the terminal. Performance test was done in order to prove the performance of the terminal, and the test result of the terminal's excellency and transmitted/recevied packet is described.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.1C
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• pp.34-37
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• 2012

The paper introduces the an necklace type UHF RFID tag for a live tree having high dielectric constant. When a general UHF RFID tag is used for the metal and the material with high dielectric constant, the electrical characteristics and impedance of antenna have been changed, and the tag is not recognized by an UHF RFID reader. The necklace type UHF RFID tag has been designed with consideration of the high dielectric constant of the tree material. The name tag for a live tree has been designed with the developed tag antenna. The performance of tag has been measured and the reading range is about 4~5m. The developed UHF RFID tag antenna can be applied to any high dielectric material for various industrial applications.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.1131-1132
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• 2008

In this paper, we developed UHF RFID R/W system using AT91SAM7S256(ARM chip), UHF RFID R/W module (WJ7090) and wireless LAN(IEEE 802.11.a/b). And we developed a transmission/receiving packet which is send to UHF R/W module in AT91SAM7S256. In order to show the usefulness of UHF RFID R/W system, we executed a performance test. The developed UHF RFID R/W system shows better performance for reading of RFID tag and data transmission through wireless LAN.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.1
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• pp.193-198
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• 2009

In this paper, we report the design of UHF RFID ceramic antenna using HFSS, one of the widely used RFID design tools. Of the developed antenna system, we analyze its Return Loss using HFSS and its characteristics using Smith Chart methodology. We built the ceramic antenna system based on the HFSS design, and analyzed its performance by measuring the impedence matching and gains using Network Analyzer. We attach the developed prototype to UHF RFID portable terminal, and performed distance measuring for five widely used types of RFID tags to verify the performance of our proposed antenna system.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.23 no.1
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• pp.131-134
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• 2012

A bar-code shape UHF RFID tag antenna is designed and fabricated with silver conductive ink. It can be recognize by both bar-code scanner and RFID reader. The bar-code shape is taken from a general box of a product, and the product code of the bar-code is used for the antenna design. The tag antenna is fabricated with silver conductive ink using a T-matching structure. The designed tag antenna is satisfied with bar-code system and RFID system simultaneously. The input reflection coefficient characteristics and the reading range pattern are measured. The peak reading range is about 111 cm, which is long enough.

• 한국ITS학회:학술대회논문집
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• v.2006 no.10
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• pp.179-181
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• 2006

톨게이트에서 사용되는 UHF RFID 비발디 배열 안테나를 설계하였다. 안테나의 주파수 대역은 미국 기준의 RFID UHF 대역으로 $902{\sim}928MHz$이다. 안테나 설계는 먼저 단일소자 비발디 안테나를 설계한 후, 전력분배 비율 0.3:1:1:0.3으로 $1{\times}4$ 배열한 안테나로 설계하였다. 설계된 배열 안테나는 VSWR 2:1이하에서 $850{\sim}942MHz$인 S11 특성을 보였다. 이득은 최대방사 9.93dBi를 얻었다. 안테나 제작은 주파수를 높여 scale down하여, 1소자 비발디를 제작하고 이의 특성을 측정하였다.