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 50-Ω feed position can be achieved by moving the feed point along the diagonal of the square patch, leading to ease in fabrication.