W-band Antenna-in-Package for Satellite Communications

This paper proposes a circularly-polarized Wband satellite antenna with split-ring elements for axial ratio compensation. The proposed antenna is fed by a circular feeding stripline at the substrate center for rotational symmetry, and two split rings are placed on top of each other above the feeding layer. The split rings allow tuning the axial ratio for different array elements by rotating their angles individually. The proposed antenna shows a fractional bandwidth of $12 \%$ and maintains a high realized gain of 15.7dBic for a $4 \times 4$ planar array with an axial ratio of $2.1 \mathrm{~dB}$ at 93.5GHz.