Mobile device

A mobile device, comprising:

• a ground element;
• a first radiation element, having a feeding point, wherein the first radiation element comprises a meandering portion and a terminal extension portion;
• a second radiation element, coupled to the feeding point, wherein the second radiation element is at least partially surrounded by the first radiation element, wherein the second radiation element comprises a narrow portion and a wide portion, and the wide portion is coupled through the narrow portion to the feeding point, and wherein a coupling gap is formed between the first radiation element and the second radiation element;
• and
• a dielectric substrate, wherein the ground element, the first radiation element, and the second radiation element are disposed on the dielectric substrate;
• wherein a planar antenna structure is formed by the first radiation element and the second radiation element;
• wherein the planar antenna structure covers a first frequency band defined as a TETRA (Terrestrial Trunked Radio) frequency band and a second frequency band defined as a GPS (Global Positioning System) frequency band.