Experimental prototyping demonstrates wideband circularly polarized radiation in a compact antenna array, highlighting potential for integrated satellite navigation terminals.
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 GHz-1.724 GHz) and 10.7% (1.51 GHz-1.68 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 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">(0.931λ₀× 0.931λ₀× 0.09λ 0</tex> , where <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">λ₀</tex> is free space wavelength at 1.51 GHz).
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Nasimuddin et al. (2024) studied this question.
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