Patent ID: 6885346

Claim:
A built-in single band antenna device in a mobile terminal, comprising: a built-in single band antenna formed into a conductive pattern on a board extending from the upper side of a main printed circuit board (PCB); a duplexer for separating a radio frequency (RE) signal received from the built-in single band antenna from a second RE signal transmitted to the built-in single band antenna; and a controller for processing the RF signal directed from the built-in single band antenna to the duplexer, the controller detecting whether the mobile terminal is in one of an idle state and a call state, connecting the built-in single band antenna to receive and transmit RF signals if the mobile terminal is in the idle state, and disconnecting the built-in single band antenna if the mobile terminal is in the call state; wherein the call state is a state in which the mobile terminal is one of being actively engaged in a call and attempting to connect a call, and the idle state is a state in which the mobile terminal is not engaged in a call.