A 4×4 circularly polarized aperture coupled antenna array for Ka-band satellite communication

A 4×4 circular polarized planar antenna array design is presented. It can be used as a building block for a large-scale Ka-band satellite communication phased array antenna. The array is easy to be fabricated and integrated with electronic devices (e.g. phase shifters). It shows high circular polarization purity (axial ratio less that 1dB at the range of 650MHz/29GHz) and the reflection coefficient of better than -19dB over a wide bandwidth of 17 %.