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A broadband single-feed compact circularly polarized stacked microstrip antenna for radiofrequency identification (RFID) reader applications is proposed and investigated. The proposed antenna achieved a gain of more than 5.0 dBic, impedance bandwidth with VSWR less than 2 and a wide 3-dB axial-ratio (AR) bandwidth of more than 12% over ultra-high frequency (UHF) band (840 - 940 MHz). The overall antenna size is 0.48Â¿o Ã 0.48Â¿o Ã 0.0984Â¿o at 900 MHz. The proposed antenna is attractive for RFID reader applications which require compact size and good circular polarization operation.