A dual-polarized microstrip antenna array with high isolation fed by coplanar network

In this paper, serial corner feeding of a square patch with two ports is proposed to realize dual polarization. For the four-element dual-polarized array, a novel coplanar feedline network is presented. An efficient method of analysis is developed and a practical array is manufactured. The measured isolation is less than -40 dB at 6.07 GHz. The proposed array occupies a smaller area than other dual-polarized arrays commonly used and is easier to further combine to form a larger coplanar array.