Dual-Band Dual-Circularly Polarized Antenna Utilizing a Radiating Slot Antenna as Feeding Structure

This paper presents a new dual-frequency dualcircular polarization antenna. The coupling slot in this antenna serves both as the feed structure and the radiating slot antenna. The magneto-electric dipole (ME-dipole) radiating patch and the feed slot can generate left-hand circularly polarized (LHCP) and right-hand circularly polarized (RHCP) responses, individually. The dual-frequency impedance bandwidths are 18.2% (2.14-2.57 GHz) and 17.8% (3.78-4.52 GHz), while the axial ratio (AR) bandwidths for LHCP and RHCP are 21.3% (2.26-2.80 GHz) and 25.9% (3.3-4.28 GHz), individually.