Antenna system and mobile terminal using same

An antenna system in a mobile terminal having a screen and a back cover forming a receiving space with the screen, comprising:

• a circuit board in the receiving space, having a feeding point, an RF switch, and a system ground;
• a feeding portion electrically connected to the feeding point, a ground portion connected to the system ground by the RF switch, and a connecting portion connecting the feeding portion to the ground portion;
• the ground portion including a first half-sealed space formed by extending counterclockwise from an end of the connecting portion;
• the feeding portion including a second half-sealed space formed by extending clockwise from another end of the connecting portion;
• the ground portion including a first metal segment at a starting end thereof for connecting to the connecting portion, and a second metal segment at an ending point thereof, the feeding portion including a third metal segment at a starting point thereof and a fourth segment at an ending point thereof, the RF switch electrically connecting to the second metal segment, and the feeding point electrically connected to the fourth segment;
• wherein the connecting portion extends along a short side of the mobile terminal, the back cover includes a main portion opposite to the screen and a side portion extending from an edge of the main portion toward the screen;
• the mobile terminal further includes a speaker box having a first surface opposite to the main portion and a second surface opposite to the side portion;
• the speaker box further includes a sound aperture formed in the second surface, the antenna system is formed on the first surface and the second surface of the speaker box;
• the antenna system is integral with the sound aperture.