Patent ID: 8648750

Claim:
An antenna for transmitting a wireless signal, comprising: a ground element; a short element, connected to the ground element; a transmitting element, connected to the short element, wherein the transmitting element comprises a U shaped portion and an extending section, and the U shaped portion comprises a first section, a second section and a third section, wherein a first groove is formed between the first section and the second section, and a second end of the first section is connected to the short element, and a first end of the first section is connected to the third section, and a first end of the second section is connected to the third section, and a second end of the second section is a free end of the transmitting element, and a first end of the extending section is connected to the third section, and a second end of the extending section is an extending free end of the transmitting element, wherein a second groove is formed between the first section and the extending section; a ground point, wherein the ground point is located on the short element; and a feed point, wherein the feed point is adjacent to the free end of the second section; wherein the U shaped portion composes a loop antenna unit arranged such that a current travels from the ground point, passing the first section, the third section and the second section, along the first groove to the feed point, and wherein the first section and the extending section compose an open stub unit arranged such that the current travels from the ground point, passing the first section and the extending section, along the second groove to the extending free end.