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 915 MHz is achieved for RFID use.
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doi:10.1109/APS.2010.5562077
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doi:10.2528/PIER07110604
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doi:10.1109/TAP.2007.915486
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doi:10.1109/LAWP.2010.2076361
7. Nasimuddin, N., K. P. Esselle, and A. K. Verma, "Wideband circularly polarized stacked microstrip antennas," EEE Antennas and Wireless Propagation Letters, Vol. 6, 21-24, 2007.
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8. Chang, T. N. and J. M. Lin, "Serial aperture-coupled dual band circularly polarized antenna," IEEE Trans. Antennas Propag., Vol. 59, No. 6, 2419-2423, Jun. 2011.
doi:10.1109/TAP.2011.2144553
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doi:10.1109/LAWP.2011.2182174
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