A Single Feed Wideband Circularly Polarized Dipole Antenna with Wide Beamwidth

This work presents a single feed dipole antenna with wide beamwidth and wideband circularly polarization. The presented dipole antenna is composed of a two-way power divider with 90° phase shifter, a square patch, two pairs of square arms, eight vertical rectangular patches, and four notched metallic walls. The square arms function as electric dipoles. The vertical rectangular patches and the notched metallic wall are designed as magnetic dipoles. The two-way power divider is used to generate two signals with a 90° phase difference and identical amplitudes. The presents antenna has a simulated impedance bandwidth of 98.6% (0.75 GHz 2.21 GHz), while its simulated 3-dB axial ratio bandwidth of 105.4% (0.70 GHz 2.26 GHz). In the band of 0.75 GHz to 2.0 GHz (90.9%), while the beamwidth is achieved between 118° ~ 175° at H-plane and between 122° ~ 183° at E-plane.