Slim Mobile Communication Device and Antenna Structure thereof

A slim mobile communication device, comprising an antenna structure, the antenna structure comprising:

• a dielectric substrate, comprising a no-ground portion and a ground portion, wherein the no-ground portion comprises a first edge used as a feeding edge and a second edge used as a non-feeding edge;
• a ground element, disposed on the ground portion of the dielectric substrate;
• an antenna element, that is a planar structure providing a first operating band and a second operating band, and is disposed on the no-ground portion of the dielectric substrate;
• the first edge and the second edge of the no-ground portion are surrounded by the ground element;
• wherein a distance between a non-feeding side edge of the antenna element and the second edge of the no-ground portion is smaller than 3 mm, a length of the non-feeding side edge of the antenna element is at least 5 mm, and the non-feeding side edge of the antenna element is short-circuited to the ground element;
• and
• a feeding line, coupled to the feeding side edge of the antenna element.