Mobile device

A mobile device, comprising:

• a first radiation element, coupled to a signal source;
• a second radiation element, coupled to a ground voltage, wherein the second radiation element is adjacent to the first radiation element;
• a third radiation element, coupled to the signal source, wherein the first radiation element, the second radiation element, and the third radiation element substantially extend in a same direction;
• a fourth radiation element, coupled to the ground voltage, wherein the fourth radiation element is disposed between the first radiation element and the second radiation element;
• a fifth radiation element, coupled to the ground voltage, wherein the fifth radiation element is adjacent to the second radiation element;
• and
• a dielectric substrate, wherein the first radiation element, the second radiation element, the third radiation element, the fourth radiation element, and the fifth radiation element are disposed on the dielectric substrate;
• wherein an antenna structure is formed by the first radiation element, the second radiation element, the third radiation element, the fourth radiation element, the fifth radiation element, and the dielectric substrate.