Patent ID: 8914082

Claim:
A mobile terminal comprising: a plurality of antennas; a main ground; at least one sub-ground separate from the main ground and positioned adjacent to a corresponding antenna among the plurality of antennas; at least one switch configured to switch a connection of the main ground and the at least one sub-ground; and a controller configured to sustain or move a resonance frequency of the corresponding antenna by controlling switching of the connection of the main ground and the at least one sub-ground, wherein the plurality of antennas comprise: a first antenna disposed at one side of a printed circuit board (PCB) including at least one electronic component and the main ground, the first antenna being a main antenna configured to transmit and receive a wireless signal, a second antenna disposed at another side of the PCB, the second antenna being a sub-antenna configured to receive a wireless signal transmitted from a base station, and a third antenna configured to receive a digital broadcasting signal; and wherein: the first antenna and the second antenna are formed as a diversity antenna for mobile communication, at least one second sub-ground is positioned adjacent to the third antenna and separate from the main ground and the at least one sub-ground, and at least one second switch is configured to switch a connection of the main ground and the at least one second sub-ground according to a control signal of the controller.