Wideband circularly polarized triangular-ring slot antenna for GAIA-I microsatellite

A novel compact size equilateral triangular ring-slot antenna is proposed for microsatellite. The presented antenna utilizes truncation, perturbation, and slits to generate wideband circular polarization (CP) operation from its inherited linear polarization. The fabricated antenna has wide CP performance of 1106 MHz or 52.27% of fractional bandwidth at 2116 MHz center frequency. The measured results show that the antenna is bidirectional with its RHCP operation is radiated in main lobe. There is good agreement between simulated and measured radiation patterns.