Patent ID: 8207903

Claim:
An antenna, comprising: a substrate, comprising a first surface and a second surface, wherein the first surface is opposite to the second surface; a feed conductor, formed on the first surface; a ground layer, formed on the second surface; and a radiation slot, formed on the ground layer, wherein the radiation slot is substantially U shaped, comprising: a first radiation portion; a second radiation portion, comprising a first end and a second end, wherein the second radiation portion is L shaped, and the first end is connected to the first radiation portion; and a third radiation portion, wherein the second end is connected to the third radiation portion, and the feed conductor is corresponding to the second end, wherein the second radiation portion comprises a first section and a second section, the first section is perpendicular to the second section, the first end is located on the first section, the second end is located on the second section, and a width of the second section is larger than a width of the first section; wherein when the antenna transmits a low frequency signal, the antenna transmits the low frequency signal via the second radiation portion and the third radiation portion, wherein when the antenna transmits a high frequency signal, the antenna transmits the high frequency signal via the first radiation portion.