• Journal of Korea Multimedia Society
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• 제14권2호
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• pp.194-200
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• 2011

Recently, RFID(Radio Frequency IDentification) market spread in industry region is entering a phase of stagnation due to cost issue. RFID tag inlay cost has become relatively more expensive due to the recent decrease in chip price. Therefore, a simple and rapid design technique for RFID tag has yet to be implemented to achieve low cost. This paper presents a design technique considering chip impedance for antenna design for improved accuracy and computation time. As a result, it is confirmed that analysis error for resonance ranges within 20MHz and readable range error falls within 1.5m.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 한국전기전자재료학회 2009년도 춘계학술대회 논문집
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• pp.55-56
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• 2009

Small RFID tag antenna were fabricated on Si substrate and their physical and electrical properties were evaluated. With decreasing the size of tag antenna on Si substrate, small SMD-type RFID tags could be fabricated, which is very useful for PCB tracking. Firstly, tag antenna pattern and the electromagnetic properties were simulated with HFSS. The frequency was 13.56MHz, the line-width and line-gap were modeled in the range of $50{\sim}200{\mu}m$. S parameters, SRF, and Q value were calculated from geometry. When the line-width and line-gap were 100um and the loop-turn was 10, the SRF was 80MHZ and the Q value was ca. 9. When the microstrip antenna pattern of aluminum was fabricated by using DC sputtering, Vpp of ca. 1.6V was obtained when the reader-tag distance was 40mm.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 한국전기전자재료학회 2008년도 춘계학술대회 논문집 센서 박막재료연구회 및 광주 전남지부
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• pp.18-21
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• 2008

기존의 대부분의 안테나는 한정된 공간에서 한정범위의 인식이 곤란한 단점이 있었다. 이러한 단점을 개선하고 소형화를 위하여, 간단한 형태의 다이폴안테나를 설계 하였다. Ansoft사의 Designer를 이용하여 안테나 시뮬레이션을 수행 하였으며, 산업체의 자동화 공정이나, 컨베이어상에서 제품에 부착된 전자태그의 인식효율과 소형화를 고려하여 설계하였다. 설계한 안테나는 RFID 안테나의 소형화와 한정된 공간에서 Tag 의 인식을 위해 테프론 기판을 이용한 다이폴 형태로 구현 제작하였다. 본 연구결과 설계 제작된 안테나는, 도우넛형태의 방사패턴을 가지며, 협소한 지역에 전파를 방사시켜서, 주변의 불필요한 태그의 인식을 최소로 하였고, 실제로 컨베이어 장치를 이용하여 개발 제품의 성능 테스트를 수행하였으며, 그 결과 제품의 우수성을 검증 하였다.

• Proceedings of the KIEE Conference
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.1563_1564
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• 2009

전자파가 인체에 미치는 영향에 대한 연구중 SAR(Specific Absorption Ratio)에 관한연구는 매우 활발하게 이루어지고 있으나 단파(High Frequency)대역에 의한 인체유도전류에 대한 연구는 미흡한 편이다. 본 연구에서는 근거리장에서 단파대역 RFID 리더 안테나에 의한 인체에 유도되는 전류를 측정하고 이를 등가화 할 수 있는 수직교차루프 형태의 인체등가 모형을 제시하여 인체의 유도전류량과 비교하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• 제18권7호
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• pp.1713-1720
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• 2014

RFID technology has evolved from basic operation like the acquisition of tag IDs into a more complicated operation such as the simultaneous acquisition of tag IDs and their positions and recently, is raising the possibility of obtaining additional informations, which include their velocities, directions and distances. In this paper, we present a RFID system that can fullfil aforementioned advanced functions. In the proposed system, a tag transmits a sequence of FMCW pulses modulated by ID signals and a reader separates the tag signals in azimuth direction using an array antenna, followed by the FMCW demodulation from which distances, velocities as well as the tag IDs are extracted. We propose a receiver structure of the reader and theoretically analyze its operability. Moreover, its performance is examined by simulation.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• 제18권1호
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• pp.31-36
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• 2007

In the RFID system, one of the important criteria of tag antenna performance is the detection distance. The most important factor determining the detection distance of the tag antenna is the Radar Cross Sections(RCS). In this paper, we propose a method to simply measure the RCS of the RFID tag antenna using two reader antennas(Tx and Rx) and a network analyzer. We estimate RCS' from the RCS equation based on the measured $S_{21}$ using the network analyzer. We compare the measured $S_{21}$ values with the calculated $S_{21}$ values and the simulated $S_{21}$ values using EM simulator. The used tag antennas are two kinds of dipole-type, metal-type, and an inductively-coupled type ones. In case of the dipole type, the measured, simulated and calculated values of the RCS are almost the same. In case of other types, we obtain the measured RCS values with a difference of about 3 dB.

• Journal of the Institute of Electronics Engineers of Korea CI
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• 제44권3호
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• pp.23-30
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• 2007

RFID it reads information which is it writes, the semiconductor chip for and the radio frequency system which uses the hazard antenna it has built-in transmission of information it talks. Formation which is transmitted like this collection and America which it filtrates wey the RFID search service back to inform the location of the server which has commodity information which relates with an object past record server. The hazard where measurement analysis result the leader for electronic interference does not occur consequently together from with verification test the power level which is received from the antenna grade where it stands must maintain minimum -55dBm and the electronic interference will not occur with the fact that, antenna and reel his recognition distance the maximum 7m until the recognition which is possible but smooth hazard it must stand and and with the fact that it will do from within and and and 3-4m it must be used Jig it is thought.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 한국통신학회 2006년도 하계종합학술발표회 논문 초록집
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• pp.257-257
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• 2006

• Journal of the Korea Institute of Military Science and Technology
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• 제16권4호
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• pp.414-421
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• 2013

In this paper, a novel IFF(Identification of Friend and Foe) landmine system has been designed and fabricated using RFID(Radio Frequency Identification) wireless communication system. The IFF landmine system is composed of RECOMS(Remote Controlled Munition System), RFID reader and RFID tag. When the friendly forces have been identified by RFID wireless communication, the IFF landmine is unloaded automatically and indicates the warning message to the operator. Through the discussion, the detailed designs and the test results of identification distance have been described and antenna revision plans for improving the performance have been mentioned.

• Journal of the Microelectronics and Packaging Society
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• 제16권1호
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• pp.21-25
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• 2009

By using Si CMOS process, small RFID tag antenna were fabricated on Si substrate and their electrical properties were evaluated. Firstly, tag antenna pattern and the electromagnetic properties were simulated with HFSS. The frequency was 13.56 MHz, the line-width and line-gap were modeled in the range of $50{\sim}200{\mu}m$. S parameters, SRF, and Q value were calculated from geometry. When the line-width and line-gap were $100{\mu}m$ and $100 {\mu}m$, respectively and the loop-turn was 10, the SRF was 80 MHZ and the Q value was ca. 9. When the microstrip antenna pattern of aluminum $2{\mu}m$ was fabricated by using DC sputtering, Vpp of ca. 4.3 V was obtained when the reader and tag were closely contacted.