A Dual Circularly-Polarized X-band Isoflux Antenna for Low Earth Orbit Satellite Communication

In this paper, a dual circularly polarized isoflux antenna that can be used for low earth orbit (LEO) satellite communication is designed. The dielectric lens-loaded corrugated horn is used to achieve the saddle-shaped radiation pattern with a good axial ratio (AR) in the X-band range of $8 \sim 8.5$ GHz. The antenna gain is $- 3.6 \sim 6.2$ dBic in the range of ±60° at all operating frequencies, and the AR is less than 3dB, which can realize lefthand circular polarization (LHCP) and right-hand circular polarization (RHCP) radiation simultaneously. The simulation results show that the designed antenna achieves an isoflux pattern in a wide frequency band with good AR, and can be applied to LEO communication satellites, earth observation, remote sensing, and other fields.