Abstract
In this paper, a compact near fleld reader antenna is proposed for ultra-high frequency (UHF) radio frequency identiflcation (RFID) applications. The antenna structure is composed of two split-ring-resonators (SRRs) and miniaturized to a special small size of 21 ⁄ 21 ⁄ 1:6mm 3 for mobile RFID application. The measured bandwidth of antenna prototype is 13MHz (914.5{927.5MHz) with re∞ection coe-cient less than i10dB, which covers the China RFID band II (920{925MHz). Simulation shows that the proposed antenna achieves a strong and uniform magnetic fleld distribution in the near fleld region, and the reading range is up to 42mm with near fleld RFID tag. Through modifying the parameters of SRRs, the antenna can operate on difierent UHF RFID bands (Europe band, China band I&II etc.).
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