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In this paper, a novel wideband circularly polarized (CP) slot antenna and its array are presented. The antenna element consists of a C-shaped slot and a 50-Ωmicrostrip-fed port to achieve left-hand circular polarization. Both the impedance bandwidth (IBW) and the 3-dB axial ratio bandwidth (ARBW) are greatly broadened by off-center microstrip-fed sword-shaped structure. A2× 2array prototype based on the proposed CP element is also designed. Sequential rotation microstrip-feeding structure is used to excite four antennas and to realize good symmetric unidirectional radiation. To verify this design, both the CP antenna element and2× 2array are fabricated and measured. The measured results of the antenna element exhibit an IBW of 132% (0.85–$4.15~GHz$) and an ARBW of95.7% (1.20-3.40GHz). The measured ARBW and IBW of the2× 2antenna array are about 108.3% (1.10–$3.70~GHz$) and100% (1.15-3.45GHz), respectively. And the measured peak gain of the antenna array reaches 13.4 dBic. The proposed antenna is very suitable for CP applications in L/S bands.
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Xu et al. (2017) studied this question.
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