earticle

영어

Recently, there have been widely conducted researches on dual-band radio frequency identification (RFID) tag based on 13.56 MHz (HF) and 900 MHz (UHF). Most dual-band RFID tag has been implemented so that each antenna is separated in a different inlay sheet respectively, which makes the resulting smart card impractically thick, and the typical drawback of dual-band RFID tags incorporated in one inlay is a mutual frequency interference phenomenon due to the fabrication of the HF antenna and the UHF antenna on the same sheet. In this paper, we introduce a novel design of high performance smart card with HF/UHF dual-band RFID tag to overcome the frequency interference problem. Firstly, we have design and tested a UHF RFID tag using a simulation software system. In the smart card hardware design stage, we connect a HF antenna and a UHF antenna and place them in one inlay sheet. Using a spectrum analyzer, we systematically adjust the antenna pattern to detect the optimal patterns that fit the impedance of the RFID chip.