Patent ID: 8044877

Claim:
An antenna, comprising: a printed circuit board comprising: a plurality of layers including a top layer, a first inner layer disposed below the top layer, a second inner layer disposed below the first inner layer, a bottom layer disposed below the second inner layer; and a plurality of dielectric layers each disposed between two of the adjacent of the plurality of the layers; an antenna unit comprising: a first pattern printed on the top layer and being of a substantially coiled shape; a second pattern printed on the first inner layer and being of a meandering shape; a third pattern printed on the second inner layer and being of a meandering shape; a fourth pattern printed on the bottom layer and being of a substantially coiled shape; a feeding point disposed on the top layer and connected to one end of the first pattern; a first conducting through hole penetrated the dielectric layer disposed between the top layer and the first inner layer, and electronically interconnecting the other end of the first pattern and one end of the second pattern; a second conducting through hole penetrated the dielectric layer disposed between the first inner layer and the second inner layer, and electronically interconnecting the other end of the second pattern and one end of the third pattern; a third conducting through hole penetrated the dielectric layer disposed between the second inner layer and the bottom layer, and electronically interconnecting the other end of the third pattern and one end of the fourth pattern; and a grounding point disposed on the bottom layer and connected to the other end of the fourth pattern.