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단일 안테나를 사용하는 RFID에서의 Phase Shifter를 이용한 TX Leakage 제거 방식
전부원,배재현,노형환,정명섭,박준석,Jeon, Bu-Won,Bae, Jae-Hyun,Roh, Hyoung-Hwan,Joung, Myoung-Sub,Park, Jun-Seok 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.8
RFID 시스템에서는 현재 같은 주파수 대역에서 송신 단과 수신 단이 사용되며, 이에 따라 듀플렉서를 사용할 수 없게 되며 커플러를 사용하게 된다. 커플러를 사용함으로써 송신 누설 신호는 수신 단으로 직접적으로 영향을 주며, 이에 따라 태그의 인식 거리가 제한되는 부정적인 영향을 미치게 된다. 본 논문에서는 Rx 단으로 직접 적으로 영 향을 주는 Tx 누설 신호를 감쇄시키는 방법을 소개하고 ADS2006 시뮬레이션으로 이를 검증하였다 Rx and Tx signal use same band in RFID. Then RFID system is not used duplexer and used coupler. RFID system have problem about Rx part to Tx leakage signal because that Rx signal port is Tx signal port's Isolation port. We proposal using phase shifter Tx leakage signal decrease than other RFID system. It is same signal Tx signal port's coupling port and isolation port signal except amplitude and phase. So if make coupling signal and isolation signal is in all same signal. We cancel Tx leakage signal used coupling port. And verification about ADS2006.
UHF 대역 RFID 전파경로에서의 전파간섭 모델링 및 채널 운용 방안 제안
文永周(Young-Joo Moon),呂善美(Seon-Mi Yeo),田富元(Bu-Won Jeon),盧衡煥(Hyoung-Hwan Roh),鄭明燮(Myoung-Sub Joung),吳夏嶺(Ha-Ryoung Oh),成榮洛(Yeong-Rak Seong),朴准奭(Jun Seok Park) 대한전기학회 2008 전기학회논문지 Vol.57 No.11
Auto-ID industries and their services have been improved since decades ago, and radio frequency identification (RFID) has been contributing in many applications. Product management can be the foremost example. In our industrial experiences, RFID in ultra high frequency (UHF) band provides much longer interrogation ranges than that of 13.56㎒; many more applications exist thereby. There should be several interesting and useful ideas on UHF RFID; however, those ideas can be limited due to the inevitable environmental circumstances that restrict the interrogation range in shorten value. This paper discusses the propagation interference among different types of readers (e.g, mobile RFID readers in stationary reader zone) in dense-reader environment. In most cases, UHF RFIDs in Korea will be dependent on the UHF mobile RFIDs. In this sense, the UHF mobile users accidently move into the stationary reader's interrogation zone. This is serious problem. In this paper, we analyze propagation loss and propose the effective channel allocation scheme that can contribute developing less-invasive UHF RFID networks. The simulation and practical measurement process using the commercial CAD tools and measurement equipments are presented.