Patent ID: 8217844

Claim:
An antenna, comprising: a substrate including a first surface and a second surface opposite to the first surface; a grounding unit disposed on the first surface of the substrate; a radiator disposed on the second surface of the substrate, including a first metal arm, a second metal arm, and a connecting portion, wherein the first metal arm and the second metal arm are at least partially distributed in the same direction, the first metal arm has a length larger than or equal to that of the second metal arm, the first metal arm is connected to the grounding unit, two ends of the connecting portion are connected to the first metal arm and the second metal arm respectively and substantially across a space between the first metal arm and the second metal arm; a coupling unit disposed on the first surface, wherein the coupling unit and the second metal arm partially overlap without contacting each other, the coupling unit excites the radiator by coupling effect to selectively generate at least one of a first frequency band mode and a second frequency band mode; and a signal transmission line including a signal line and a ground line, wherein the signal line is connected to the coupling unit and the ground line is connected to the ground unit.