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Heejun Park(박희준),Abdul Rehman(압둘 레만),Changhyeong Lee(이창형),Sung Hun Jin(진성훈),Sungtek Kahng(강승택) 대한전기학회 2019 전기학회논문지 Vol.68 No.2
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.