A new dual-polarized microstrip antenna array is presented. Diagonal feedin
g of the square patch with two ports is proposed to obtain dual linear pola
rization. A novel coplanar feedline network is also presented for the dual-
polarized array. For engineering purposes, a CAD-oriented method of analysi
s is developed. The measured results demonstrate high isolation between the
two input ports. The array has simple structure and is easy to further com
bine to form larger coplanar arrays. (C) 1999 John Wiley & Sons, Inc.