Two dual-polarization aperture coupled microstrip antennas at Ka-band

In this paper, two kinds of Ka-band dual-polarized microstrip antenna are designed. Both the two antennas use a multi-layer dielectric, and the substrate is Teflon. Through the comparison between the two kinds of the aperture, at last come out with the better one, which can achieve high-isolation and low cross-polarization level. For the dual polarization ports of the hour glass shaped aperture coupled antenna, the isolation between the horizontal and vertical ports is better than 50dB. The cross-polarization levels in both E and H planes are better than 50dB.