A Sequential-Phase Fed Dual-Band Dual-Circular-Polarized Patch Antenna for Ka-Band Satellite Communications

In this paper, a dual-band dual-circular-polarized patch antenna for Ka-band satellite communications is presented. It integrates 2 x 2 aperture-coupled corner-truncated microstrip patch antenna elements and the microstrip feeding network provides a good amplitude and phase for the subarrays. By using sequential rotation technique, it achieves good impedance bandwidth and axial ratio bandwidth, which covers the uplink frequencies (30-31 GHz) and downlink frequencies (20-21 GHz) of Ka-band satellite communications. Since the elements are placed within an appropriate range, the two ports are well isolated. The detailed design process is given in this paper, and good simulation and measured results are obtained.