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A probe-fed circularly polarized microstrip patch antenna is presented. By stacking a sot-ring a proper distance above the patch, traveling current along the periphery of the slot-ring is formed. The axial-ratio bandwidth is optimized by varying the size of the slot-ring and the size of the ground plane. Through this simple method, 3- dB axial-ratio bandwidth of 9.8% centered at 915MHz is achieved for RFID use.
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Chang et al. (2013) studied this question.
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