A Center-fed Circularly Polarization Antenna

A center-fed circularly polarization (CP) antenna is proposed in this paper. A special divider is utilized as the feeding network to excite two perpendicular modes with $\mathbf{9 0}^{\circ}$ phase difference, generating the circular polarization. The axial ratio covers two bands from 7.03 GHz to 7.34 Ghz and from 8.78 GHz to 9.48 GHz, respectively. The simulation reflection coefficients in these band are both below $\mathbf{- 1 0} \text{dB}$. Four types of roation array are depicted to validate its features as simplifying the feeding network design.