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In this letter, a new wideband circularly polarized (CP) slot – microstrip patch antenna (SPMA) is elaborated. The proposed antenna consists of four crown patches as parasitic patches, an L-shaped crown slot etched into the ground plane as a parasitic slot, and a circular loop sequential rotating feeding structure (SRFS) as a driven element. First, four crown patches are used to stimulate a CP resonance. Second, the L-shaped crown slot is applied to excite an additional CP resonance. After that, the CP bandwidth of the antenna could be enhanced by combining these CP resonant modes. The measured results demonstrate that the antenna features a wide CPBW of 14.8% (5.30–6.15, 5.725 GHz), which has a potential application value in the WIFI (5.85–5.925 GHz) bands and the wireless local area network ITS (5.8 GHz) and (5.725–5.85 GHz).

Wideband circularly polarized microstrip-slot antenna with parasitic elements