Antenna module of electronic device

An antenna module of an electronic device comprises at least one controllable antenna unit, an application unit and a microcontroller. The controllable antenna unit comprises a dual-band dipole antenna and at least one dual-band reflector. A first diode and a second diode of the dual-band reflector are parallel to a first capacitor with the same polarity using a short circuit. The application module receives RSSI or receiving data rate from a wireless chip of the electronic device. The microcontroller connecting the application unit and the dual-band reflector of the controllable antenna unit outputs a DC control voltage to the dual-band reflector of the controllable antenna unit. The microcontroller cooperated with an algorithm process controlled by the application unit determines whether to use the DC control voltage to conduct the first diode and the second diode according to RSSI or receiving data rate. Thus, the radiation pattern of the controllable antenna unit can be controlled.