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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-<inline-formula> <tex-math notation="LaTeX">$\Omega $ </tex-math></inline-formula> microstrip-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. A <inline-formula> <tex-math notation="LaTeX">$2\times 2$ </tex-math></inline-formula> array 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 and <inline-formula> <tex-math notation="LaTeX">$2\times 2$ </tex-math></inline-formula> array are fabricated and measured. The measured results of the antenna element exhibit an IBW of 132&#x0025; (0.85&#x2013;<inline-formula> <tex-math notation="LaTeX">$4.15~GHz$ </tex-math></inline-formula>) and an ARBW of <inline-formula> <tex-math notation="LaTeX">$95.7{\%} (1.20-3.40$ </tex-math></inline-formula> GHz). The measured ARBW and IBW of the <inline-formula> <tex-math notation="LaTeX">$2\times 2$ </tex-math></inline-formula> antenna array are about 108.3&#x0025; (1.10&#x2013;<inline-formula> <tex-math notation="LaTeX">$3.70~GHz$ </tex-math></inline-formula>) and <inline-formula> <tex-math notation="LaTeX">$100{\%} (1.15-3.45$ </tex-math></inline-formula> GHz), 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.

A Design of Broadband Circularly Polarized C-Shaped Slot Antenna With Sword-Shaped Radiator and Its Array for L/S-Band Applications