Antenna structure and wireless communication device using the same

A wireless communication device comprising:

• an antenna structure, the antenna structure comprising:
• a side frame, the side frame defining a first gap and a second gap, the first gap and the second gap both passing through and extending to cut across the side frame, wherein the side frame is divided into a first radiating portion by the first gap and the second gap;
• a first feed portion, the first feed portion electrically connected to the first radiating portion for dividing the first radiating portion into a first resonance section and a second resonance section;
• a second feed portion, the second feed portion electrically connected to one end of the second resonance section adjacent to the first gap;
• and
• a first ground portion, the first ground portion electrically connected to one end of the first resonance section adjacent to the second gap;
• wherein when the first feed portion supplies current, the current flows through the first resonance section and is grounded through the first ground portion to activate a first operating mode and a second operating mode to generate radiation signals in a first radiation frequency band and a second radiation frequency band;
• wherein when the first feed portion supplies current, the current flows through the second resonance section and is grounded through the second feed portion to activate a third operating mode to generate radiation signals in a third radiation frequency band;
• and
• wherein when the second feed portion supplies current, the current flows through the second resonance section and the first resonance section, and is grounded through the first ground portion to activate a fourth operating mode to generate radiation signals in a fourth radiation frequency band.