A dual-circularly-polarized antenna array for satcom-on-the-move system

A dual-circularly-polarized antenna array for “Satcom-On-The-Move” (SOTM) system is presented. The antenna array consists of radiation patch, ground with H-shaped slots, power dividers and branch line coupler. Through two H-shaped slots in the ground, the antenna element is fed by the feedlines printed on the bottom side of the lower layer. By switching feeding ports of branch line coupler, the antenna array can change circular polarizations with little gain loss. The antenna array has the advantages of excellent impendence matching, low cross-polarization and high isolation.