Patent ID: 7599725

Claim:
A mobile communication terminal having a dual intenna, comprising: a radio frequency (RF) switching unit to determine whether a folder of the mobile communication terminal is opened or closed; a first intenna to be used if the RF switching unit determines that the folder is closed; and a second intenna to be used if the RF switching unit determines that the folder is opened, wherein the RF switching unit connects a main processing unit of a main printed circuit board of the mobile communication terminal to the first intenna if the folder is closed, and connects the main processing unit to the second intenna if the folder is opened, wherein the RF switching unit includes: a RF switch comprising a first intenna connection port connected to the first intenna, a second intenna connection port connected to the second intenna, a main processing unit connection port connected to the main processing unit, and an intenna selection control port connecting the first intenna connection port and the main processing unit connection port in response to receiving a first electric signal, or connecting the second intenna connection port and the main processing unit connection port in response to receiving a second electric signal; a power feeder connected to the main processing unit connection port of the RF switch to transfer an RF signal inputted through the first intenna and the second intenna to an impedance matching unit and to transfer an RF signal inputted from the impedance matching unit to the first intenna and the second intenna; an RF switch controller to supply the first electric signal or the second electric signal to the intenna selection control port, the first electric signal to be supplied if the folder is closed, and the second electric signal to be supplied if the folder is open; and a power supplier to supply an electric power to the RF switch, and wherein the RF switch controller includes: a voltage supplier connected to the intenna selection control port of the RF switch to supply the first electric signal to the intenna selection control port; a transistor having one end connected to the voltage supplier and the intenna selection control port in parallel and another end connected to a ground, the ground to supply the second electric signal; and an open/close state sensor to transmit a low electric signal or a high electric signal to the transistor according to if the folder is opened or if the folder is closed in order to turn on or off the transistor.