1. An antenna assembly, disposed in a wireless communications electronic device, the wireless communications electronic device being provided with a substrate, wherein the antenna assembly comprises:a radiation element disposed at a first surface of the substrate;
a feeder electrically connected to the radiation element; and
a reference ground disposed at a second surface of the substrate;
wherein the antenna assembly comprises at least two radiation elements;
wherein the feeder comprises a microstrip feeder and at least two power division microstrips, and the number of the power division microstrips is equal to that of the radiation elements;
wherein one end of each of the power division microstrips is connected to a corresponding radiation element, and the other end of the each of the power division microstrips is connected to the microstrip feeder.