Dual-band antenna and electronic device employing the same

An electronic device, operable to radiate electromagnetic signals, comprising:

• a shielding portion;
• a ground portion that is substantially rectangular, electrically connected to the shielding portion;
• a feed portion operable to feed electromagnetic signals;
• a radiating portion, comprising:
• an elongated first radiator, a first end of which is electrically connected to the ground portion, and a second end of which is floating;
• a second radiator with two floating arms forming a U shape;
• and
• a connecting portion connected to the first radiator, the second radiator and the feed portion, wherein the feed portion feeds electromagnetic signal to the first radiator and the second radiator via the connecting portion;
• and
• a fine-tuning portion arranged around the second radiator, operable to control operating frequency bands of the second radiator;
• wherein the ground portion, the first radiator, one arm of the second radiator and the connecting portion are in a first plane, two arms of the second radiator are arranged on a second plane, and the second plane is perpendicular to the first plane.