An antenna array using gap-coupled patches as the elements is proposed.The input impedance characteristics of single patch and gap-coupled patches are analysed by use of dyadic Green’s function for grounded dielectric slab and moment method.The input impedances of gap-coupled patch array are obtained by combination with the antenna elements and the feeding networks that consist of divider tees
bends and feed line.According to the surface currents solved from the integral equation
the far field patterns of gap-coupled patch arrays are calculated.The compariscn with the ordinary rectangular patch arrays is made.The agreement between theoretical and experimental data is quite good.All microstrip antennas have been designed and fabricated on substrate with εr=2.86.h=1.5mm.