Mobile QR Code QR CODE : The Transactions of the Korean Institute of Electrical Engineers
Title How to Improve Isolation and Electrical Characteristics of Two RFID Tag Antennas, When They Are Located By An Extremely Small Gap
Authors 박희준(Heejun Park) ; 압둘 레만(Abdul Rehman) ; 이창형(Changhyeong Lee) ; 진성훈(Sung Hun Jin) ; 강승택(Sungtek Kahng)
DOI http://doi.org/10.5370/KIEE.2019.68.2.334
Page pp.334-341
ISSN 1975-8359
Keywords RFID ; Tag atennas ; Dipole atennas ; Interference ; Isolation ; Resonance
Abstract In this paper, we show a new scheme to tackle the problems of high electromagnetic-coupling, poor impedance- matching. and degraded radiation-characteristics of two RFID tag antennas, when they are located with an extremely short distance. As giving it a variety of tries such as periodic EBG-type structures and notch-making stubs, we can get an optimal device to lower the electromagnetic coupling and to match the input impedance of both of the tag antennas. Even for a UHF-band, the device is very thin less than 1 mm unlike other isolation-enhancers which are thick or multi-layered. The dips in the S11 and S21-curves are generated at the target frequency, which means excellent impedance match and lowered interference for the two tag dipole-antennas. This is helpful to higher thruput in RFID.