A novel compact design of planar circularly polarized (CP) tag antenna for UHF RFID system is proposed. By introducing the Y-shaped slit as the feed structure, the measured half-power bandwidth of the proposed CP tag antenna can be more than 135MHz (860-1000MHz), which includes the entire operating bandwidth for worldwide UHF RFID system. The obtained 3dB axial-ratio (AR) bandwidth can be about 10MHz suitable for Taiwan UHF RFID applications. The proposed tag antenna reduces the antenna size by at least 30% since the antenna size is only 40x40xmm(2). The simulated peak gain and antenna efficiency are approximately 0.4dBic and 91% for Taiwan UHF RFID band. Meanwhile, with omnidirectional reading pattern, the measured reading distance is about 7.2m. Good tag sensitivity was obtained across the desired frequency band.
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