Patent ID: 7405695

Claim:
A switching circuit of an antenna module for switching a plurality of antennas of the antenna module so that the antenna module has a plurality of modes of use and each mode with two antennas for radiating a transmitting signal generated from a signal processing unit or sending a received receiving signal to the signal processing unit; the switching circuit comprising: a plurality of power dividing modules for dividing the transmitting signal into the antennas; a plurality of switches coupled to the power dividing modules, the plurality of switches including a first switch coupled to the signal processing unit and a second switch coupled to the first switch for sending the transmitting signal to the power dividing modules; and a control unit for controlling on and off of the switches as well as the signal processing unit; wherein the receiving signal received by the antennas passes through the power dividing modules and the switches, to the signal processing unit, wherein the antenna module has a first antenna, a second antenna, a third antenna and a fourth antenna; the plurality of power dividing modules comprising: a first power dividing module dividing the transmitting signal to the first antenna and the second antenna; a second power dividing module dividing the transmitting signal to the third antenna and the fourth antenna; a third power dividing module dividing the transmitting signal to the first power dividing module and the second power dividing module; and the plurality of switches including: the first switch coupled between the signal processing unit and the third power dividing module; the second switch coupled between the first switch and the first power dividing module as well as between the first switch and the second power dividing module; a third switch coupled between the third power dividing module and the first power dividing module; and a fourth switch coupled between the third power dividing module and the second power dividing module.