C/X-Band Shared-Aperture Phased Array Antenna

A novel dual-band shared-aperture phased array antenna is proposed in this paper. Patch antennas are employed operating in the X band, and above them a dipole antenna operating in the C band is employed. The dipole is elaborately designed to a disconnected form, reducing the coupling from the X-band antennas. The patches are also reflecting ground of the C-band antennas in addition to the X-band radiators. The calculated results show that the C-band antenna can scan up to ±45° with the active VSWRs below 3 within 4.68−5.26 GHz (11.7% in the C band) and the X-band antenna can scan up to ±60° with the active VSWRs below 3 within 8.7−10.1 GHz (14.9% in the X band). It is a good alternative for satellite communications.