A Single-feed Compact Wideband Circularly Polarized Antenna for INMARSAT/GNSS Applications

A single-feed low profile compact wideband circularly polarized (CP) stacked antenna is proposed for INNIARSAT/GNSS applications. The antenna consists of a ringslotted radiating patch with a grounded metallic-via, a slit-slotted parasitic patch, and a coaxial feeding probe. The wideband CP radiation is attributed to the stacked slit-/slotted-patches combination and ring-slot patch with grounded via. An antenna prototype at the L-band with an overall size of 0.38 lambda(0) x 0.38 lambda(0) x 0.066 lambda(0) (lambda(0) is the free space wavelength at 1.518 GHz) shows a measured 3-dB axial ratio (AR) bandwidth of 9.8% (1.50 GHz - 1.67 GHz), impedance bandwidth (-10dB reflection coefficient) of 12.9% (1.479 GHz - 1.683 GHz), and gain greater than 5.2 dBic across the AR bandwidth.