Reduced Size, Dual-Polarized Microstrip Patch Antenna for Wireless Communications

A novel, compact, probe-fed microstrip patch antenna for operation in dual-polarization mode is proposed. The novel design is achieved by etching out a symmetric pattern of crossed slots from the surface of a square probe-fed patch. Reduction in patch size of up to 51% with respect to a traditional dual-polarized square patch operating at the same frequency is obtained. Results show linear polarizations in the +45 and 45 with a high isolation of 38 dB between the two ports. Moreover, the 50feed position can be achieved by moving the feed point along the diagonal of the square patch, leading to ease in fabrication.