Antenna structure and wireless communication device using same

A wireless communication device, comprising:

• an antenna structure comprising:
• a metallic member, the metallic member comprising a front frame, a backboard, and a side frame, the side frame being between the front frame and the backboard, the side frame comprising at least a bottom portion, a first side portion, and a second side portion, the first side portion and the second side portion respectively connected to two ends of the bottom portion;
• a first feed portion;
• a first ground portion;
• a second ground portion;
• and
• an extending section received in a space surrounded by the front frame, the side frame, and the backboard;
• wherein the side frame defines a slot, the slot is defined on at least the bottom portion;
• wherein the front frame defines a first gap and a second gap, the first gap and the second gap are on two opposite ends of the slot, the first gap and the second gap communicate with the slot and extends across the front frame;
• wherein a portion of the front frame between the first gap and the second gap forms a radiating section, the extending section connects to an end of the radiating section adjacent to the second gap, the first feed portion, the first ground portion, and the second ground portion are electrically connected to the radiating section, the first feed portion is positioned between the first ground portion and the second ground portion;
• and
• wherein current enters the radiating section from the first feed portion, the current flows through the radiating section and towards the first gap and the second gap, respectively, to generate radiation signals in a first frequency band and a second frequency band, the current further flows through the radiating section and towards the second gap, and through the extending section to generate radiation signals in a third frequency band, a frequency of the first frequency band is higher than a frequency of the second frequency band, a frequency of the third frequency band is higher than the frequency of the first frequency band.