A wideband circularly polarized (CP) 2×2 antenna array is proposed for INMARSAT/GNSS applications. The single-feed antenna element consists of an asymmetric-ring-slotted square patch radiator, an asymmetric-slit-slotted square stacked patch, and a coaxial feeding probe. The miniaturized slotted patches with a grounded shorted circular ring are utilized to generate the CP radiation and the stacked configuration to widen the bandwidth. The presented antenna is implemented using an arrangement of RO4003-dielectric substrate and air gap. The measured 10-dB return loss and 3-dB axial ratio (AR) bandwidths of a 2×2 antenna array prototype at the L-band are 16.8% (1.456 GHz1.724 GHz) and 10.7% (1.51 GHz1.68 GHz), respectively; the gain is greater than 11.0 dBic across the 3-dB AR bandwidth. The overall antenna volume is 185 mm × 185 mm × 18.0 mm (0.9310 × 0.9310 × 0.090, where 0 is free space wavelength at 1.51 GHz).
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Publisher Copyright
Funding Info:
This research / project is supported by the Economic Development Board (EDB) - The Office for Space Technology and Industry (OSTIn) Space Technology Development Programme (STDP)
Grant Reference no. : S23-020013-STDP