A novel wideband low profile phased-array antenna unit is presented.The antenna unit is analyzed and studied by using method of moments(MOM).The numerical results indicate that the antenna unit has more advantages compared with conventional phased-array antenna unit,it is smaller in dimension,larger in gain,lower in profile.Finally,the characteristics of the antenna in 5×5 plan antenna array is analyzed,the results show that the phased-array antenna unit can be applied in plan antenna array.