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A novel and compact microstrip-line fed printed antenna for wideband circular polarization (CP) radiation is proposed.The designed antenna utilizes a crescent-shaped substrate, rotated L-shaped monopole, and defected ground structure (DGS) to achieve a wide 3-dB axial ratio (AR) bandwidth and 10-dB impedance bandwidth (ZBW) across the entire 5 GHz Wireless Local Area Network (WLAN) and Vehicle to Everything (V2X) operational bands.As the substrate of the proposed antenna is only 0.8 mm thick, it has a very low profile of 0.014λ in terms of free space wavelength (λ) at 5.5 GHz.The proposed CP antenna exhibits overlapping 10-dB ZBW and 3-dB AR bandwidth (ARBW) of 22.05% (4.80-5.99GHz), along with broadside far-field patterns, gain greater than 2.5 dBi, and efficiency above 85% throughout the desired operating band.Therefore, it is a good candidate for WLAN and V2X communication applications.
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Kulkarni et al. (2022) studied this question.
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