Patent ID: 8014817

Claim:
A wireless communication terminal for selectively communicating by a first transmission system with only a main antenna or a second transmission system with both the main antenna and a sub antenna comprising: a main antenna, a sub antenna with a changeable impedance, a receiver circuit, wherein the receiver circuit is connected to the sub antenna and configured for changing the impedance, and a signal processing unit configured for selecting the first transmission system communicating by a first frequency band using only the main antenna or the second transmission system communicating by a second frequency band using both the main antenna and the sub antenna, wherein the second frequency band interferes with the first frequency band, wherein the impedance of the sub antenna is a first value that matches the second frequency band when the second transmission system is selected with the sub antenna used for communicating and the impedance of the sub antenna is a second value when the first transmission system is selected with the sub antenna not used for communicating, wherein the sub antenna with the second value interferes less with the main antenna than the sub antenna with the first value.