Design of A Wide Axis Ratio Beam Width Circularly Polarized Dielectric Resonator Antenna

Based on the rectangular dielectric resonator structure, a circularly polarized antenna element with wide axial ratio and beam width is proposed in this paper. In the dielectric resonator antenna, two mutually orthogonal radiation modes are excited by orthogonal feeding, so as to produce circular polarization characteristics. In order to improve the axial ratio beam width of the antenna, dielectric substrate is used on dielectric resonator antenna. The final simulation results show that the 3-dB axial ratio beam width of the antenna at 4 GHz is greater than 130 °, and it also has good impedance bandwidth. The structure of the antenna and the method of broadening the beam width are relatively novel, which provides a good idea for the design of circularly polarized dielectric resonator antenna.