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Journal Article HF RFID Reader Antenna with Loop Switch for Avoiding Magnetic Coupling
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Authors
Won-Kyu Choi, Seung-Hwan Jeong, Chan-Won Park, Cheol-Sig Pyo, Hae-Won Son
Issue Date
2014-12
Citation
ETRI Journal, v.36, no.6, pp.881-888
ISSN
1225-6463
Publisher
한국전자통신연구원 (ETRI)
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.4218/etrij.14.0114.0221
Abstract
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.
KSP Keywords
HF RFID, High frequency(HF), Loop Antenna, Magnetic coupling, Practical method, RFID reader antenna, RFID systems, Radio Frequency IDentification(RFID), Switch circuit, coupling interference, matching circuit