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A novel dual-broadband circularly polarized folded slot antenna with single-feed is presented. The proposed antenna consists of two folded annular slots. By adjusting the asymmetric widths of the two slots, circularly polarized radiation can be achieved in two difierent bands. By optimizing the parameters of the proposed antenna, two wide impedance bandwidths of 35.0% (1.91{2.72GHz) and 46.5% (4.36{7.00GHz) can be obtained, and two axial ratio bandwidths are 2.36{2.56GHz and 5.68{6.04GHz, respectively. The antenna with simple structure is fabricated and measured. Good agreement between the simulated and measured results is also achieved.

SINGLE-FEED CIRCULARLY POLARIZED ANNULAR SLOT ANTENNA FOR DUAL-BROADBAND OPERATION