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학술지 HF RFID Reader Antenna with Loop Switch for Avoiding Magnetic Coupling
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저자
최원규, 정승환, 박찬원, 표철식, 손해원
발행일
201412
출처
ETRI Journal, v.36 no.6, pp.881-888
ISSN
1225-6463
출판사
한국전자통신연구원 (ETRI)
DOI
https://dx.doi.org/10.4218/etrij.14.0114.0221
협약과제
13ZC1100, 지능형 상황인지 및 IOT 기반 기술개발, 함호상
초록
This paper studies the magnetic coupling between two adjacent loop antennas that are parallel to each other in a plane and presents a new practical method to avoid the resulting magnetic coupling interference. The study focuses on the high frequency radio-frequency identification (RFID) system for casino applications, where several loop antennas are closely built into a game table to monitor gaming chips. In this case, neighboring loop antennas may severely interfere with each other by magnetic coupling, which leads to the malfunction of the RFID system. In this paper, we present a practical loop antenna with a new loop switch circuit for avoiding magnetic coupling. The loop switch circuit is integrated with a matching circuit and automatically operated by using an interrogating signal from a reader. We verified the validity of the proposed design by showing that an RFID reader with the proposed antenna can exactly and separately read the gaming chips placed on the different betting zones of a game table.
키워드
Casino application, Loop antenna, Magnetic coupling, Reader antenna, RFID
KSP 제안 키워드
HF RFID, High Frequency(HF), Loop antenna, Magnetic coupling, Passive radio frequency identification(RFID), Practical method, RFID reader antenna, RFID system, Radio Frequency(RF), Switch circuit, coupling interference