Patent ID: 6850194

Claim:
An antenna unit comprising: an insulating substrate having a first surface and a second surface opposite said first surface; a conductive ground layer with an opening having a predetermined shape, said ground layer being disposed on the said first surface of the said first substrate; a first conductor layer having a shape substantially identical to said predetermined shape of said opening, said first conductor layer being spaced opposite said first surface at the said opening; a second conductor layer having a shape substantially identical to said predetermined shape of said opening, said second conductor layer being spaced opposite said second surface at a rear surface of said opening; a feeder section made of a strip-shaped conductor material, and connected to said first conductor layer; a first short-circuit section made of a strip-shaped conductor material, and connected to said first conductor layer and said ground layer; a second short-circuit section made of a strip-shaped conductor material, and connected to said second conductor layer and said ground layer; and a capacitor connected to said first conductor layer and said ground layer, wherein, said first conductor layer forms a first antenna.