Dual-polarized slot antennas with stacked and coplanar feed systems

This paper describes two types of dual-polarized antennas composed of slots which are excited by probes. One is an antenna which has stacked feed systems. The other is an antenna whose feed systems are printed on the same dielectric sheet (coplanar feed systems). The two radiation beams from each antenna are orthogonal and linearly polarized. Special attention is paid to the isolation between the two orthogonal beams. Input port isolation measurements show that the decoupling technique adopted is effective. The radiation patterns, return losses, and gain for the stacked and coplanar feed antennas are presented and discussed.